diff --git a/base/maps/game/mars_city1/textures/objective1.tga b/base/maps/game/mars_city1/textures/objective1.tga
index b607d917..cc177961 100644
Binary files a/base/maps/game/mars_city1/textures/objective1.tga and b/base/maps/game/mars_city1/textures/objective1.tga differ
diff --git a/base/maps/game/mars_city1/textures/objective2.tga b/base/maps/game/mars_city1/textures/objective2.tga
index 94cc2fb0..fd9d7504 100644
Binary files a/base/maps/game/mars_city1/textures/objective2.tga and b/base/maps/game/mars_city1/textures/objective2.tga differ
diff --git a/base/maps/testmaps/test_city.cm b/base/maps/testmaps/test_city.cm
index 78806cb1..ac706960 100644
--- a/base/maps/testmaps/test_city.cm
+++ b/base/maps/testmaps/test_city.cm
@@ -3,7 +3,7 @@ CM "1.00"
 3241721896
 
 collisionModel "worldMap" {
-	vertices { /* numVertices = */ 1322
+	vertices { /* numVertices = */ 5337
 	/* 0 */ ( 4932 3252.7998046875 0 )
 	/* 1 */ ( 3319.2001953125 3252.7998046875 0 )
 	/* 2 */ ( 3319.2001953125 4776 0 )
@@ -1326,8 +1326,4023 @@ collisionModel "worldMap" {
 	/* 1319 */ ( -3007.1999511719 -2916.8000488281 8 )
 	/* 1320 */ ( -2607.1999511719 -4440 0 )
 	/* 1321 */ ( -2991.1999511719 -4440 0 )
+	/* 1322 */ ( -20936 -19008 0 )
+	/* 1323 */ ( -20424 -19008 0 )
+	/* 1324 */ ( -20424 -18496 0 )
+	/* 1325 */ ( -20936 -18496 0 )
+	/* 1326 */ ( -19912 -19008 0 )
+	/* 1327 */ ( -19912 -18496 0 )
+	/* 1328 */ ( -19400 -19008 0 )
+	/* 1329 */ ( -19400 -18496 0 )
+	/* 1330 */ ( -18888 -19008 0 )
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+	/* 5307 */ ( -3016 13760 0 )
+	/* 5308 */ ( -2504 13760 0 )
+	/* 5309 */ ( -1992 13760 0 )
+	/* 5310 */ ( -1480 13760 0 )
+	/* 5311 */ ( -968 13760 0 )
+	/* 5312 */ ( -456 13760 0 )
+	/* 5313 */ ( 56 13760 0 )
+	/* 5314 */ ( 568 13760 0 )
+	/* 5315 */ ( 1080 13760 0 )
+	/* 5316 */ ( 1592 13760 0 )
+	/* 5317 */ ( 2104 13760 0 )
+	/* 5318 */ ( 2616 13760 0 )
+	/* 5319 */ ( 3128 13760 0 )
+	/* 5320 */ ( 3640 13760 0 )
+	/* 5321 */ ( 4152 13760 0 )
+	/* 5322 */ ( 4664 13760 0 )
+	/* 5323 */ ( 5176 13760 0 )
+	/* 5324 */ ( 5688 13760 0 )
+	/* 5325 */ ( 6200 13760 0 )
+	/* 5326 */ ( 6712 13760 0 )
+	/* 5327 */ ( 7224 13760 0 )
+	/* 5328 */ ( 7736 13760 0 )
+	/* 5329 */ ( 8248 13760 0 )
+	/* 5330 */ ( 8760 13760 0 )
+	/* 5331 */ ( 9272 13760 0 )
+	/* 5332 */ ( 9784 13760 0 )
+	/* 5333 */ ( 10296 13760 0 )
+	/* 5334 */ ( 10808 13760 0 )
+	/* 5335 */ ( 11320 13760 0 )
+	/* 5336 */ ( 11832 13760 0 )
 	}
-	edges { /* numEdges = */ 2552
+	edges { /* numEdges = */ 2987
 	/* 0 */ ( 0 0 ) 0 0
 	/* 1 */ ( 0 1 ) 1 2
 	/* 2 */ ( 1 2 ) 1 1
@@ -1384,7 +5399,7 @@ collisionModel "worldMap" {
 	/* 53 */ ( 40 41 ) 1 2
 	/* 54 */ ( 41 42 ) 1 1
 	/* 55 */ ( 42 43 ) 1 2
-	/* 56 */ ( 43 40 ) 0 2
+	/* 56 */ ( 43 40 ) 1 2
 	/* 57 */ ( 44 45 ) 1 2
 	/* 58 */ ( 45 46 ) 0 2
 	/* 59 */ ( 46 47 ) 1 2
@@ -1428,7 +5443,7 @@ collisionModel "worldMap" {
 	/* 97 */ ( 80 81 ) 1 2
 	/* 98 */ ( 81 82 ) 1 1
 	/* 99 */ ( 82 83 ) 1 2
-	/* 100 */ ( 83 80 ) 0 2
+	/* 100 */ ( 83 80 ) 1 2
 	/* 101 */ ( 84 85 ) 1 2
 	/* 102 */ ( 85 86 ) 0 2
 	/* 103 */ ( 86 87 ) 1 2
@@ -1472,7 +5487,7 @@ collisionModel "worldMap" {
 	/* 141 */ ( 120 121 ) 1 1
 	/* 142 */ ( 121 122 ) 1 1
 	/* 143 */ ( 122 123 ) 1 2
-	/* 144 */ ( 123 120 ) 0 2
+	/* 144 */ ( 123 120 ) 1 2
 	/* 145 */ ( 124 125 ) 1 2
 	/* 146 */ ( 125 126 ) 0 2
 	/* 147 */ ( 126 127 ) 1 2
@@ -1524,7 +5539,7 @@ collisionModel "worldMap" {
 	/* 193 */ ( 160 165 ) 0 2
 	/* 194 */ ( 164 161 ) 1 2
 	/* 195 */ ( 163 166 ) 1 2
-	/* 196 */ ( 168 169 ) 0 2
+	/* 196 */ ( 168 169 ) 1 2
 	/* 197 */ ( 169 170 ) 1 1
 	/* 198 */ ( 170 171 ) 1 1
 	/* 199 */ ( 171 168 ) 1 2
@@ -1534,7 +5549,7 @@ collisionModel "worldMap" {
 	/* 203 */ ( 175 172 ) 1 2
 	/* 204 */ ( 168 173 ) 1 2
 	/* 205 */ ( 172 169 ) 1 2
-	/* 206 */ ( 176 177 ) 0 2
+	/* 206 */ ( 176 177 ) 1 2
 	/* 207 */ ( 177 178 ) 1 1
 	/* 208 */ ( 178 179 ) 1 2
 	/* 209 */ ( 179 176 ) 1 1
@@ -1544,7 +5559,7 @@ collisionModel "worldMap" {
 	/* 213 */ ( 183 180 ) 1 2
 	/* 214 */ ( 176 181 ) 1 2
 	/* 215 */ ( 180 177 ) 1 2
-	/* 216 */ ( 184 185 ) 0 2
+	/* 216 */ ( 184 185 ) 1 2
 	/* 217 */ ( 185 186 ) 1 1
 	/* 218 */ ( 186 187 ) 1 2
 	/* 219 */ ( 187 184 ) 1 1
@@ -2390,13 +6405,13 @@ collisionModel "worldMap" {
 	/* 1059 */ ( 240 786 ) 0 2
 	/* 1060 */ ( 240 787 ) 1 1
 	/* 1061 */ ( 790 224 ) 1 1
-	/* 1062 */ ( 0 790 ) 0 2
+	/* 1062 */ ( 0 790 ) 1 2
 	/* 1063 */ ( 781 5 ) 0 1
 	/* 1064 */ ( 4 782 ) 1 1
 	/* 1065 */ ( 5 780 ) 0 1
 	/* 1066 */ ( 780 790 ) 1 2
 	/* 1067 */ ( 238 791 ) 1 1
-	/* 1068 */ ( 791 43 ) 0 2
+	/* 1068 */ ( 791 43 ) 1 2
 	/* 1069 */ ( 46 788 ) 0 1
 	/* 1070 */ ( 787 47 ) 1 1
 	/* 1071 */ ( 791 789 ) 1 2
@@ -2521,7 +6536,7 @@ collisionModel "worldMap" {
 	/* 1190 */ ( 841 843 ) 1 2
 	/* 1191 */ ( 791 237 ) 0 1
 	/* 1192 */ ( 225 790 ) 0 1
-	/* 1193 */ ( 790 791 ) 0 2
+	/* 1193 */ ( 790 791 ) 1 2
 	/* 1194 */ ( 241 789 ) 0 1
 	/* 1195 */ ( 789 780 ) 0 2
 	/* 1196 */ ( 780 227 ) 0 1
@@ -2568,13 +6583,13 @@ collisionModel "worldMap" {
 	/* 1237 */ ( 264 854 ) 0 2
 	/* 1238 */ ( 264 855 ) 1 1
 	/* 1239 */ ( 858 248 ) 1 1
-	/* 1240 */ ( 40 858 ) 0 2
+	/* 1240 */ ( 40 858 ) 1 2
 	/* 1241 */ ( 849 45 ) 0 1
 	/* 1242 */ ( 44 850 ) 1 1
 	/* 1243 */ ( 45 848 ) 0 1
 	/* 1244 */ ( 848 858 ) 1 2
 	/* 1245 */ ( 262 859 ) 1 1
-	/* 1246 */ ( 859 83 ) 0 2
+	/* 1246 */ ( 859 83 ) 1 2
 	/* 1247 */ ( 86 856 ) 0 1
 	/* 1248 */ ( 855 87 ) 1 1
 	/* 1249 */ ( 859 857 ) 1 2
@@ -2703,7 +6718,7 @@ collisionModel "worldMap" {
 	/* 1372 */ ( 909 911 ) 1 2
 	/* 1373 */ ( 859 261 ) 0 1
 	/* 1374 */ ( 249 858 ) 0 1
-	/* 1375 */ ( 858 859 ) 0 2
+	/* 1375 */ ( 858 859 ) 1 2
 	/* 1376 */ ( 265 857 ) 0 1
 	/* 1377 */ ( 857 848 ) 0 2
 	/* 1378 */ ( 848 251 ) 0 1
@@ -2750,13 +6765,13 @@ collisionModel "worldMap" {
 	/* 1419 */ ( 312 922 ) 0 2
 	/* 1420 */ ( 312 923 ) 1 1
 	/* 1421 */ ( 926 296 ) 1 1
-	/* 1422 */ ( 80 926 ) 0 2
+	/* 1422 */ ( 80 926 ) 1 2
 	/* 1423 */ ( 917 85 ) 0 1
 	/* 1424 */ ( 84 918 ) 1 1
 	/* 1425 */ ( 85 916 ) 0 1
 	/* 1426 */ ( 916 926 ) 1 2
 	/* 1427 */ ( 310 927 ) 1 1
-	/* 1428 */ ( 927 123 ) 0 2
+	/* 1428 */ ( 927 123 ) 1 2
 	/* 1429 */ ( 126 924 ) 0 1
 	/* 1430 */ ( 923 127 ) 1 1
 	/* 1431 */ ( 927 925 ) 1 2
@@ -2883,7 +6898,7 @@ collisionModel "worldMap" {
 	/* 1552 */ ( 977 979 ) 0 2
 	/* 1553 */ ( 927 309 ) 0 1
 	/* 1554 */ ( 297 926 ) 0 1
-	/* 1555 */ ( 926 927 ) 0 2
+	/* 1555 */ ( 926 927 ) 1 2
 	/* 1556 */ ( 313 925 ) 0 1
 	/* 1557 */ ( 925 916 ) 0 2
 	/* 1558 */ ( 916 299 ) 0 1
@@ -2929,13 +6944,13 @@ collisionModel "worldMap" {
 	/* 1598 */ ( 993 336 ) 1 1
 	/* 1599 */ ( 336 990 ) 0 2
 	/* 1600 */ ( 336 991 ) 1 1
-	/* 1601 */ ( 120 994 ) 0 2
+	/* 1601 */ ( 120 994 ) 1 2
 	/* 1602 */ ( 985 125 ) 0 1
 	/* 1603 */ ( 124 986 ) 1 1
 	/* 1604 */ ( 125 984 ) 0 1
 	/* 1605 */ ( 984 994 ) 1 2
 	/* 1606 */ ( 334 995 ) 1 1
-	/* 1607 */ ( 995 163 ) 0 2
+	/* 1607 */ ( 995 163 ) 1 2
 	/* 1608 */ ( 166 992 ) 0 1
 	/* 1609 */ ( 991 167 ) 1 1
 	/* 1610 */ ( 995 993 ) 1 2
@@ -3063,7 +7078,7 @@ collisionModel "worldMap" {
 	/* 1732 */ ( 1045 1047 ) 0 2
 	/* 1733 */ ( 995 333 ) 0 1
 	/* 1734 */ ( 321 994 ) 1 2
-	/* 1735 */ ( 994 995 ) 0 2
+	/* 1735 */ ( 994 995 ) 1 2
 	/* 1736 */ ( 337 993 ) 0 1
 	/* 1737 */ ( 993 984 ) 0 2
 	/* 1738 */ ( 984 323 ) 0 1
@@ -3109,12 +7124,12 @@ collisionModel "worldMap" {
 	/* 1778 */ ( 1060 1061 ) 1 1
 	/* 1779 */ ( 1061 1058 ) 0 2
 	/* 1780 */ ( 1061 1059 ) 1 2
-	/* 1781 */ ( 1062 2 ) 0 2
+	/* 1781 */ ( 1062 2 ) 1 2
 	/* 1782 */ ( 1052 4 ) 1 1
 	/* 1783 */ ( 7 1053 ) 0 1
 	/* 1784 */ ( 1062 1054 ) 1 2
 	/* 1785 */ ( 1054 7 ) 0 1
-	/* 1786 */ ( 11 1063 ) 0 2
+	/* 1786 */ ( 11 1063 ) 1 2
 	/* 1787 */ ( 1063 232 ) 1 1
 	/* 1788 */ ( 13 1059 ) 1 1
 	/* 1789 */ ( 1061 14 ) 0 1
@@ -3230,23 +7245,23 @@ collisionModel "worldMap" {
 	/* 1899 */ ( 341 1113 ) 1 1
 	/* 1900 */ ( 1113 1110 ) 0 2
 	/* 1901 */ ( 1113 1111 ) 1 2
-	/* 1902 */ ( 1114 1115 ) 0 2
+	/* 1902 */ ( 1114 1115 ) 1 2
 	/* 1903 */ ( 1105 1116 ) 0 1
 	/* 1904 */ ( 1116 167 ) 0 1
 	/* 1905 */ ( 167 1106 ) 1 1
 	/* 1906 */ ( 1114 1116 ) 0 2
 	/* 1907 */ ( 1116 1104 ) 0 1
 	/* 1908 */ ( 1104 1115 ) 0 2
-	/* 1909 */ ( 1114 161 ) 0 1
+	/* 1909 */ ( 1114 161 ) 1 1
 	/* 1910 */ ( 164 1116 ) 0 1
-	/* 1911 */ ( 1117 168 ) 0 2
+	/* 1911 */ ( 1117 168 ) 1 2
 	/* 1912 */ ( 338 1117 ) 1 1
 	/* 1913 */ ( 173 1111 ) 0 1
 	/* 1914 */ ( 1113 174 ) 1 1
 	/* 1915 */ ( 1117 1112 ) 1 2
 	/* 1916 */ ( 1112 173 ) 0 1
 	/* 1917 */ ( 230 1063 ) 0 1
-	/* 1918 */ ( 1063 1062 ) 0 2
+	/* 1918 */ ( 1063 1062 ) 1 2
 	/* 1919 */ ( 1062 225 ) 1 2
 	/* 1920 */ ( 227 1054 ) 0 1
 	/* 1921 */ ( 1054 1060 ) 0 2
@@ -3294,12 +7309,12 @@ collisionModel "worldMap" {
 	/* 1963 */ ( 1131 1128 ) 0 2
 	/* 1964 */ ( 1131 1129 ) 1 2
 	/* 1965 */ ( 346 1132 ) 1 1
-	/* 1966 */ ( 1132 10 ) 0 2
+	/* 1966 */ ( 1132 10 ) 1 2
 	/* 1967 */ ( 1122 12 ) 1 1
 	/* 1968 */ ( 15 1123 ) 0 1
 	/* 1969 */ ( 1132 1124 ) 1 2
 	/* 1970 */ ( 1124 15 ) 0 1
-	/* 1971 */ ( 19 1133 ) 0 2
+	/* 1971 */ ( 19 1133 ) 1 2
 	/* 1972 */ ( 1133 352 ) 1 1
 	/* 1973 */ ( 21 1129 ) 1 1
 	/* 1974 */ ( 1131 22 ) 0 1
@@ -3415,18 +7430,18 @@ collisionModel "worldMap" {
 	/* 2084 */ ( 485 1183 ) 1 1
 	/* 2085 */ ( 1183 1180 ) 0 2
 	/* 2086 */ ( 1183 1181 ) 1 2
-	/* 2087 */ ( 169 1184 ) 0 2
+	/* 2087 */ ( 169 1184 ) 1 2
 	/* 2088 */ ( 1175 172 ) 0 1
 	/* 2089 */ ( 175 1176 ) 1 1
 	/* 2090 */ ( 172 1174 ) 0 1
 	/* 2091 */ ( 1174 1184 ) 0 2
-	/* 2092 */ ( 1185 176 ) 0 2
+	/* 2092 */ ( 1185 176 ) 1 2
 	/* 2093 */ ( 181 1181 ) 0 1
 	/* 2094 */ ( 1183 182 ) 1 1
 	/* 2095 */ ( 1185 1182 ) 1 2
 	/* 2096 */ ( 1182 181 ) 0 1
 	/* 2097 */ ( 350 1133 ) 0 1
-	/* 2098 */ ( 1133 1132 ) 0 2
+	/* 2098 */ ( 1133 1132 ) 1 2
 	/* 2099 */ ( 1132 345 ) 0 1
 	/* 2100 */ ( 347 1124 ) 0 1
 	/* 2101 */ ( 1124 1130 ) 0 2
@@ -3443,7 +7458,7 @@ collisionModel "worldMap" {
 	/* 2112 */ ( 429 465 ) 0 1
 	/* 2113 */ ( 467 433 ) 0 1
 	/* 2114 */ ( 438 474 ) 0 1
-	/* 2115 */ ( 1184 1185 ) 0 2
+	/* 2115 */ ( 1184 1185 ) 1 2
 	/* 2116 */ ( 1185 484 ) 1 2
 	/* 2117 */ ( 477 1184 ) 0 2
 	/* 2118 */ ( 1182 1174 ) 0 2
@@ -3473,12 +7488,12 @@ collisionModel "worldMap" {
 	/* 2142 */ ( 1198 1199 ) 1 1
 	/* 2143 */ ( 1199 1196 ) 0 2
 	/* 2144 */ ( 1199 1197 ) 1 2
-	/* 2145 */ ( 1200 18 ) 0 2
+	/* 2145 */ ( 1200 18 ) 1 2
 	/* 2146 */ ( 1190 20 ) 1 1
 	/* 2147 */ ( 23 1191 ) 0 1
 	/* 2148 */ ( 1200 1192 ) 1 2
 	/* 2149 */ ( 1192 23 ) 0 1
-	/* 2150 */ ( 27 1201 ) 0 2
+	/* 2150 */ ( 27 1201 ) 1 2
 	/* 2151 */ ( 1201 520 ) 1 1
 	/* 2152 */ ( 29 1197 ) 1 1
 	/* 2153 */ ( 1199 30 ) 0 1
@@ -3593,18 +7608,18 @@ collisionModel "worldMap" {
 	/* 2262 */ ( 629 1251 ) 1 1
 	/* 2263 */ ( 1251 1248 ) 0 2
 	/* 2264 */ ( 1251 1249 ) 1 2
-	/* 2265 */ ( 177 1252 ) 0 2
+	/* 2265 */ ( 177 1252 ) 1 2
 	/* 2266 */ ( 1243 180 ) 0 1
 	/* 2267 */ ( 183 1244 ) 1 1
 	/* 2268 */ ( 180 1242 ) 0 1
 	/* 2269 */ ( 1242 1252 ) 1 2
-	/* 2270 */ ( 1253 184 ) 0 2
+	/* 2270 */ ( 1253 184 ) 1 2
 	/* 2271 */ ( 189 1249 ) 0 1
 	/* 2272 */ ( 1251 190 ) 1 1
 	/* 2273 */ ( 1253 1250 ) 0 2
 	/* 2274 */ ( 1250 189 ) 0 1
 	/* 2275 */ ( 518 1201 ) 0 1
-	/* 2276 */ ( 1201 1200 ) 0 2
+	/* 2276 */ ( 1201 1200 ) 1 2
 	/* 2277 */ ( 1200 513 ) 1 2
 	/* 2278 */ ( 515 1192 ) 0 1
 	/* 2279 */ ( 1192 1198 ) 0 2
@@ -3621,7 +7636,7 @@ collisionModel "worldMap" {
 	/* 2290 */ ( 597 609 ) 1 2
 	/* 2291 */ ( 611 601 ) 0 1
 	/* 2292 */ ( 606 618 ) 0 1
-	/* 2293 */ ( 1252 1253 ) 0 2
+	/* 2293 */ ( 1252 1253 ) 1 2
 	/* 2294 */ ( 1253 628 ) 0 2
 	/* 2295 */ ( 621 1252 ) 1 2
 	/* 2296 */ ( 1250 1242 ) 0 2
@@ -3652,12 +7667,12 @@ collisionModel "worldMap" {
 	/* 2321 */ ( 1267 1264 ) 0 2
 	/* 2322 */ ( 1267 1265 ) 1 2
 	/* 2323 */ ( 634 1268 ) 1 1
-	/* 2324 */ ( 1268 26 ) 0 2
+	/* 2324 */ ( 1268 26 ) 1 2
 	/* 2325 */ ( 1258 28 ) 1 1
 	/* 2326 */ ( 31 1259 ) 0 1
 	/* 2327 */ ( 1268 1260 ) 1 2
 	/* 2328 */ ( 1260 31 ) 0 1
-	/* 2329 */ ( 35 1269 ) 0 2
+	/* 2329 */ ( 35 1269 ) 1 2
 	/* 2330 */ ( 1269 640 ) 1 1
 	/* 2331 */ ( 37 1265 ) 1 1
 	/* 2332 */ ( 1267 38 ) 0 1
@@ -3772,18 +7787,18 @@ collisionModel "worldMap" {
 	/* 2441 */ ( 773 1319 ) 1 1
 	/* 2442 */ ( 1319 1316 ) 0 2
 	/* 2443 */ ( 1319 1317 ) 1 2
-	/* 2444 */ ( 185 1320 ) 0 2
+	/* 2444 */ ( 185 1320 ) 1 2
 	/* 2445 */ ( 1311 188 ) 0 1
 	/* 2446 */ ( 191 1312 ) 1 1
 	/* 2447 */ ( 188 1310 ) 0 1
 	/* 2448 */ ( 1310 1320 ) 1 2
-	/* 2449 */ ( 1321 192 ) 0 2
+	/* 2449 */ ( 1321 192 ) 1 2
 	/* 2450 */ ( 197 1317 ) 0 1
 	/* 2451 */ ( 1319 198 ) 1 1
 	/* 2452 */ ( 1321 1318 ) 0 2
 	/* 2453 */ ( 1318 197 ) 0 1
 	/* 2454 */ ( 638 1269 ) 0 1
-	/* 2455 */ ( 1269 1268 ) 0 2
+	/* 2455 */ ( 1269 1268 ) 1 2
 	/* 2456 */ ( 1268 633 ) 0 1
 	/* 2457 */ ( 635 1260 ) 0 1
 	/* 2458 */ ( 1260 1266 ) 0 2
@@ -3800,86 +7815,521 @@ collisionModel "worldMap" {
 	/* 2469 */ ( 717 753 ) 1 2
 	/* 2470 */ ( 755 721 ) 0 1
 	/* 2471 */ ( 726 762 ) 0 1
-	/* 2472 */ ( 1320 1321 ) 0 2
+	/* 2472 */ ( 1320 1321 ) 1 2
 	/* 2473 */ ( 1321 772 ) 0 2
 	/* 2474 */ ( 765 1320 ) 1 2
 	/* 2475 */ ( 1318 1310 ) 0 2
 	/* 2476 */ ( 1310 769 ) 0 1
 	/* 2477 */ ( 774 1318 ) 0 1
-	/* 2478 */ ( 192 771 ) 0 1
-	/* 2479 */ ( 153 760 ) 0 1
-	/* 2480 */ ( 152 723 ) 0 1
-	/* 2481 */ ( 724 760 ) 1 1
-	/* 2482 */ ( 766 185 ) 0 1
-	/* 2483 */ ( 184 627 ) 0 1
-	/* 2484 */ ( 622 177 ) 0 1
-	/* 2485 */ ( 718 752 ) 0 1
-	/* 2486 */ ( 145 616 ) 0 1
-	/* 2487 */ ( 614 752 ) 1 1
-	/* 2488 */ ( 144 603 ) 0 1
-	/* 2489 */ ( 604 616 ) 1 1
-	/* 2490 */ ( 598 608 ) 0 1
-	/* 2491 */ ( 113 712 ) 0 1
-	/* 2492 */ ( 112 699 ) 0 1
-	/* 2493 */ ( 700 712 ) 1 1
-	/* 2494 */ ( 694 704 ) 0 1
-	/* 2495 */ ( 105 592 ) 0 1
-	/* 2496 */ ( 590 704 ) 1 1
-	/* 2497 */ ( 550 584 ) 0 1
-	/* 2498 */ ( 104 555 ) 0 1
-	/* 2499 */ ( 556 592 ) 1 1
-	/* 2500 */ ( 73 688 ) 0 1
-	/* 2501 */ ( 650 74 ) 0 1
-	/* 2502 */ ( 33 640 ) 0 1
-	/* 2503 */ ( 682 544 ) 0 1
-	/* 2504 */ ( 682 645 ) 1 1
-	/* 2505 */ ( 646 65 ) 0 1
-	/* 2506 */ ( 646 532 ) 1 1
-	/* 2507 */ ( 530 66 ) 0 1
-	/* 2508 */ ( 526 536 ) 0 1
-	/* 2509 */ ( 634 520 ) 0 1
-	/* 2510 */ ( 18 512 ) 0 1
-	/* 2511 */ ( 176 483 ) 0 1
-	/* 2512 */ ( 137 472 ) 0 1
-	/* 2513 */ ( 470 608 ) 1 1
-	/* 2514 */ ( 478 169 ) 0 1
-	/* 2515 */ ( 466 328 ) 0 1
-	/* 2516 */ ( 478 340 ) 1 1
-	/* 2517 */ ( 338 170 ) 0 1
-	/* 2518 */ ( 598 436 ) 1 1
-	/* 2519 */ ( 434 138 ) 0 1
-	/* 2520 */ ( 97 424 ) 0 1
-	/* 2521 */ ( 422 584 ) 1 1
-	/* 2522 */ ( 96 411 ) 0 1
-	/* 2523 */ ( 412 424 ) 1 1
-	/* 2524 */ ( 466 429 ) 1 1
-	/* 2525 */ ( 430 129 ) 0 1
-	/* 2526 */ ( 430 316 ) 1 1
-	/* 2527 */ ( 314 130 ) 0 1
-	/* 2528 */ ( 406 416 ) 0 1
-	/* 2529 */ ( 89 304 ) 0 1
-	/* 2530 */ ( 302 416 ) 1 1
-	/* 2531 */ ( 334 1114 ) 0 1
-	/* 2532 */ ( 322 120 ) 0 1
-	/* 2533 */ ( 322 309 ) 1 1
-	/* 2534 */ ( 310 121 ) 0 1
-	/* 2535 */ ( 262 296 ) 0 1
-	/* 2536 */ ( 88 267 ) 0 1
-	/* 2537 */ ( 268 304 ) 1 1
-	/* 2538 */ ( 57 400 ) 0 1
-	/* 2539 */ ( 398 536 ) 1 1
-	/* 2540 */ ( 526 364 ) 1 1
-	/* 2541 */ ( 362 58 ) 0 1
-	/* 2542 */ ( 394 256 ) 0 1
-	/* 2543 */ ( 394 357 ) 1 1
-	/* 2544 */ ( 358 49 ) 0 1
-	/* 2545 */ ( 358 244 ) 1 1
-	/* 2546 */ ( 242 50 ) 0 1
-	/* 2547 */ ( 17 352 ) 0 1
-	/* 2548 */ ( 350 512 ) 1 1
-	/* 2549 */ ( 346 232 ) 0 1
-	/* 2550 */ ( 238 248 ) 0 1
-	/* 2551 */ ( 2 224 ) 0 1
+	/* 2478 */ ( 3108 3107 ) 1 1
+	/* 2479 */ ( 3109 3108 ) 1 1
+	/* 2480 */ ( 3107 3172 ) 1 1
+	/* 2481 */ ( 3108 3173 ) 1 2
+	/* 2482 */ ( 3173 3107 ) 0 2
+	/* 2483 */ ( 3173 3172 ) 1 2
+	/* 2484 */ ( 3109 3174 ) 0 2
+	/* 2485 */ ( 3174 3108 ) 0 2
+	/* 2486 */ ( 3174 3173 ) 1 2
+	/* 2487 */ ( 3175 3109 ) 1 2
+	/* 2488 */ ( 3175 3174 ) 0 2
+	/* 2489 */ ( 3190 3189 ) 1 1
+	/* 2490 */ ( 3141 3206 ) 0 1
+	/* 2491 */ ( 3172 3237 ) 1 1
+	/* 2492 */ ( 3173 3238 ) 1 2
+	/* 2493 */ ( 3238 3172 ) 0 2
+	/* 2494 */ ( 3238 3237 ) 1 2
+	/* 2495 */ ( 3174 3239 ) 0 2
+	/* 2496 */ ( 3239 3173 ) 0 2
+	/* 2497 */ ( 3239 3238 ) 0 2
+	/* 2498 */ ( 3175 3240 ) 0 1
+	/* 2499 */ ( 3240 3174 ) 0 1
+	/* 2500 */ ( 3174 3241 ) 1 1
+	/* 2501 */ ( 3241 3242 ) 1 1
+	/* 2502 */ ( 3242 3239 ) 0 2
+	/* 2503 */ ( 3244 3175 ) 1 1
+	/* 2504 */ ( 3189 3257 ) 1 1
+	/* 2505 */ ( 3190 3258 ) 0 1
+	/* 2506 */ ( 3258 3259 ) 0 1
+	/* 2507 */ ( 3259 3189 ) 0 1
+	/* 2508 */ ( 3261 3190 ) 1 1
+	/* 2509 */ ( 3192 3262 ) 1 1
+	/* 2510 */ ( 3264 3192 ) 0 1
+	/* 2511 */ ( 3206 3277 ) 0 1
+	/* 2512 */ ( 3237 3308 ) 1 1
+	/* 2513 */ ( 3238 3309 ) 0 2
+	/* 2514 */ ( 3309 3237 ) 0 2
+	/* 2515 */ ( 3309 3308 ) 1 2
+	/* 2516 */ ( 3239 3310 ) 0 2
+	/* 2517 */ ( 3310 3238 ) 1 2
+	/* 2518 */ ( 3310 3309 ) 0 2
+	/* 2519 */ ( 3242 3311 ) 1 1
+	/* 2520 */ ( 3311 3239 ) 0 2
+	/* 2521 */ ( 3311 3312 ) 1 1
+	/* 2522 */ ( 3312 3310 ) 1 2
+	/* 2523 */ ( 3308 3359 ) 1 1
+	/* 2524 */ ( 3309 3360 ) 0 2
+	/* 2525 */ ( 3360 3308 ) 0 2
+	/* 2526 */ ( 3360 3359 ) 1 2
+	/* 2527 */ ( 3310 3361 ) 0 2
+	/* 2528 */ ( 3361 3309 ) 1 2
+	/* 2529 */ ( 3361 3360 ) 1 2
+	/* 2530 */ ( 3312 3362 ) 1 1
+	/* 2531 */ ( 3362 3310 ) 0 2
+	/* 2532 */ ( 3362 3363 ) 1 1
+	/* 2533 */ ( 3363 3361 ) 1 2
+	/* 2534 */ ( 3406 3405 ) 1 1
+	/* 2535 */ ( 3407 3406 ) 1 1
+	/* 2536 */ ( 3359 3409 ) 1 1
+	/* 2537 */ ( 3360 3410 ) 0 2
+	/* 2538 */ ( 3410 3359 ) 0 2
+	/* 2539 */ ( 3410 3409 ) 1 2
+	/* 2540 */ ( 3361 3411 ) 0 2
+	/* 2541 */ ( 3411 3360 ) 0 2
+	/* 2542 */ ( 3411 3410 ) 0 2
+	/* 2543 */ ( 3363 3412 ) 0 1
+	/* 2544 */ ( 3412 3361 ) 0 1
+	/* 2545 */ ( 3361 3413 ) 0 1
+	/* 2546 */ ( 3413 3411 ) 0 2
+	/* 2547 */ ( 3430 3380 ) 0 1
+	/* 2548 */ ( 3405 3455 ) 1 2
+	/* 2549 */ ( 3455 3454 ) 1 1
+	/* 2550 */ ( 3406 3456 ) 0 2
+	/* 2551 */ ( 3456 3405 ) 0 2
+	/* 2552 */ ( 3456 3455 ) 1 2
+	/* 2553 */ ( 3407 3457 ) 0 2
+	/* 2554 */ ( 3457 3406 ) 1 2
+	/* 2555 */ ( 3457 3456 ) 1 2
+	/* 2556 */ ( 3458 3407 ) 1 1
+	/* 2557 */ ( 3458 3457 ) 1 2
+	/* 2558 */ ( 3409 3459 ) 1 1
+	/* 2559 */ ( 3410 3460 ) 0 2
+	/* 2560 */ ( 3460 3409 ) 0 2
+	/* 2561 */ ( 3460 3459 ) 0 2
+	/* 2562 */ ( 3411 3461 ) 0 2
+	/* 2563 */ ( 3461 3410 ) 0 2
+	/* 2564 */ ( 3461 3460 ) 0 2
+	/* 2565 */ ( 3413 3462 ) 0 1
+	/* 2566 */ ( 3462 3411 ) 0 1
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 	nodes {
 	( 0 -546.3999023438 )
@@ -4556,7 +9006,12 @@ collisionModel "worldMap" {
 	( -1 0 )
 	( -1 0 )
 	}
-	polygons /* polygonMemory = */ 74708 {
+	polygons /* polygonMemory = */ 89944 {
+	4 ( 2986 2948 2985 2984 ) ( 0 0 1 ) 0 ( 4932 -4160 0 ) ( 11832 4544 0 ) "textures/common/caulk"
+	4 ( 2909 2907 2908 2906 ) ( 0 0 1 ) 0 ( -20936 5056 0 ) ( 11832 13760 0 ) "textures/common/caulk"
+	4 ( 2981 2850 2980 2849 ) ( 0 0 1 ) 0 ( 4664 4544 0 ) ( 11832 5056 0 ) "textures/common/caulk"
+	4 ( 2983 2848 2982 2847 ) ( 0 0 1 ) 0 ( 3640 4776 0 ) ( 4664 5056 0 ) "textures/common/caulk"
+	4 ( 2975 2845 2974 2846 ) ( 0 0 1 ) 0 ( 2616 4544 0 ) ( 3640 5056 0 ) "textures/common/caulk"
 	4 ( -3 11 -7 -9 ) ( -0 1 0 ) 4776 ( 3319.2001953125 4776 0 ) ( 4932 4776 8 ) "textures/mars_citybuilder/mars_dirt"
 	4 ( -4 9 -6 10 ) ( 1 0 0 ) 4932 ( 4932 3252.7998046875 0 ) ( 4932 4776 8 ) "textures/mars_citybuilder/mars_dirt"
 	4 ( 5 6 7 8 ) ( -0 0 1 ) 8 ( 3319.2001953125 3252.7998046875 8 ) ( 4932 4776 8 ) "textures/mars_citybuilder/mars_dirt"
@@ -4574,7 +9029,7 @@ collisionModel "worldMap" {
 	4 ( 1191 -300 1192 1193 ) ( 0 0 -1 ) 0 ( 3191.2001953125 2740.7998046875 0 ) ( 4932 3124.7998046875 0 ) "textures/mars_citybuilder/mars_road_dusty_center"
 	4 ( -1781 1784 1785 -11 ) ( -0 1 0 ) 4776 ( 3191.2001953125 4776 0 ) ( 3319.2001953125 4776 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
 	4 ( 1782 -8 1783 -1764 ) ( -0 0 1 ) 8 ( 3207.2001953125 3252.7998046875 8 ) ( 3319.2001953125 4776 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
-	4 ( 2551 273 -1919 1781 ) ( 0 0 -1 ) 0 ( 3191.2001953125 3124.7998046875 0 ) ( 3319.2001953125 4776 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
+	4 ( 2979 273 -1919 1781 ) ( 0 0 -1 ) 0 ( 3191.2001953125 3124.7998046875 0 ) ( 3319.2001953125 4776 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
 	4 ( 1768 -1763 -1760 -1767 ) ( -1 0 0 ) -3191.2001953125 ( 3191.2001953125 3252.7998046875 8 ) ( 3191.2001953125 4776 14 ) "textures/base_wall/steel"
 	4 ( 1766 1767 -1759 -1765 ) ( -0 1 0 ) 4776 ( 3191.2001953125 4776 8 ) ( 3207.2001953125 4776 14 ) "textures/base_wall/steel"
 	4 ( 1764 1765 -1758 -1762 ) ( 1 0 0 ) 3207.2001953125 ( 3207.2001953125 3252.7998046875 8 ) ( 3207.2001953125 4776 14 ) "textures/base_wall/steel"
@@ -4597,7 +9052,7 @@ collisionModel "worldMap" {
 	4 ( 297 298 299 300 ) ( 0 0 -1 ) 0 ( 2807.2001953125 2740.7998046875 0 ) ( 3191.2001953125 3124.7998046875 0 ) "textures/mars_citybuilder/mars_road_dusty_intersection"
 	4 ( 1080 1081 -1074 -1078 ) ( 1 0 0 ) 2679.2001953125 ( 2679.2001953125 3124.7995605469 8 ) ( 2679.2001953125 3140.7995605469 14 ) "textures/base_wall/steel"
 	4 ( 281 282 283 284 ) ( -0 0 1 ) 8 ( 2679.2001953125 3124.7998046875 8 ) ( 2807.2001953125 3252.7998046875 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
-	4 ( -1198 437 2549 280 ) ( 0 0 -1 ) 0 ( 1258.400390625 3124.7998046875 0 ) ( 2807.2001953125 3252.7998046875 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
+	4 ( -1198 437 2973 280 ) ( 0 0 -1 ) 0 ( 1258.400390625 3124.7998046875 0 ) ( 2807.2001953125 3252.7998046875 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
 	4 ( 1199 -304 1200 -466 ) ( -0 0 1 ) 8 ( 1258.400390625 2740.7998046875 8 ) ( 2807.2001953125 3124.7998046875 8 ) "textures/mars_citybuilder/mars_road_dusty_center"
 	4 ( 1197 -464 1198 -298 ) ( 0 0 -1 ) 0 ( 1258.400390625 2740.7998046875 0 ) ( 2807.2001953125 3124.7998046875 0 ) "textures/mars_citybuilder/mars_road_dusty_center"
 	4 ( -1068 1071 1072 -61 ) ( 1 0 0 ) 4932 ( 4932 2612.7998046875 0 ) ( 4932 2740.7998046875 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
@@ -4642,7 +9097,7 @@ collisionModel "worldMap" {
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 	4 ( 287 288 289 290 ) ( -0 0 1 ) 8 ( 3191.2001953125 2612.7998046875 8 ) ( 3319.2001953125 2740.7998046875 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
-	4 ( 2550 305 -1924 285 ) ( 0 0 -1 ) 0 ( 3191.2001953125 1281.599609375 0 ) ( 3319.2001953125 2740.7998046875 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
+	4 ( 2978 305 -1924 285 ) ( 0 0 -1 ) 0 ( 3191.2001953125 1281.599609375 0 ) ( 3319.2001953125 2740.7998046875 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
 	4 ( 265 266 267 -262 ) ( 1 0 0 ) 3239.2001953125 ( 3239.2001953125 2692.7998046875 8 ) ( 3239.2001953125 2700.7998046875 112 ) "textures/base_wall/steel"
 	4 ( -335 1925 -301 1926 ) ( -0 0 1 ) 8 ( 2807.2001953125 1281.599609375 8 ) ( 3191.2001953125 2740.7998046875 8 ) "textures/mars_citybuilder/mars_road_dusty_center_east_west"
 	4 ( -331 1923 -297 1924 ) ( 0 0 -1 ) 0 ( 2807.2001953125 1281.599609375 0 ) ( 3191.2001953125 2740.7998046875 0 ) "textures/mars_citybuilder/mars_road_dusty_center_east_west"
@@ -4653,7 +9108,7 @@ collisionModel "worldMap" {
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 	4 ( 293 294 295 296 ) ( -0 0 1 ) 8 ( 2679.2001953125 2612.7998046875 8 ) ( 2807.2001953125 2740.7998046875 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
-	4 ( 2546 -450 2545 292 ) ( 0 0 -1 ) 0 ( 1386.400390625 2612.7998046875 0 ) ( 2807.2001953125 2740.7998046875 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
+	4 ( 2966 -450 2965 292 ) ( 0 0 -1 ) 0 ( 1386.400390625 2612.7998046875 0 ) ( 2807.2001953125 2740.7998046875 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
 	4 ( 1816 -60 1817 -1799 ) ( -0 0 1 ) 8 ( 3207.2001953125 1409.599609375 8 ) ( 3319.2001953125 2612.7998046875 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
 	4 ( 1803 -1798 -1795 -1802 ) ( -1 0 0 ) -3191.2001953125 ( 3191.2001953125 1409.599609375 8 ) ( 3191.2001953125 2612.7998046875 14 ) "textures/base_wall/steel"
 	4 ( 1799 1800 -1793 -1797 ) ( 1 0 0 ) 3207.2001953125 ( 3207.2001953125 1409.599609375 8 ) ( 3207.2001953125 2612.7998046875 14 ) "textures/base_wall/steel"
@@ -4670,18 +9125,20 @@ collisionModel "worldMap" {
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 	4 ( 1830 1831 -1823 -1829 ) ( -0 1 0 ) 769.599609375 ( 3191.2001953125 769.599609375 8 ) ( 3207.2001953125 769.599609375 14 ) "textures/base_wall/steel"
 	4 ( 319 320 321 322 ) ( -0 0 1 ) 8 ( 3191.2001953125 769.599609375 8 ) ( 3319.2001953125 897.599609375 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
-	4 ( 2535 373 -1928 317 ) ( 0 0 -1 ) 0 ( 3191.2001953125 -561.6000976562 0 ) ( 3319.2001953125 897.599609375 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
+	4 ( 2955 373 -1928 317 ) ( 0 0 -1 ) 0 ( 3191.2001953125 -561.6000976562 0 ) ( 3319.2001953125 897.599609375 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
 	4 ( -403 1929 -333 1930 ) ( -0 0 1 ) 8 ( 2807.2001953125 -561.6000976562 8 ) ( 3191.2001953125 897.599609375 8 ) "textures/mars_citybuilder/mars_road_dusty_center_east_west"
 	4 ( -399 1927 -329 1928 ) ( 0 0 -1 ) 0 ( 2807.2001953125 -561.6000976562 0 ) ( 3191.2001953125 897.599609375 0 ) "textures/mars_citybuilder/mars_road_dusty_center_east_west"
 	4 ( 1258 1259 -1252 -1256 ) ( 1 0 0 ) 2679.2001953125 ( 2679.2001953125 1281.5994873047 8 ) ( 2679.2001953125 1297.5994873047 14 ) "textures/base_wall/steel"
 	4 ( 313 314 315 316 ) ( -0 0 1 ) 8 ( 2679.2001953125 1281.599609375 8 ) ( 2807.2001953125 1409.599609375 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
-	4 ( -1380 505 2542 312 ) ( 0 0 -1 ) 0 ( 1258.400390625 1281.599609375 0 ) ( 2807.2001953125 1409.599609375 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
+	4 ( -1380 505 2962 312 ) ( 0 0 -1 ) 0 ( 1258.400390625 1281.599609375 0 ) ( 2807.2001953125 1409.599609375 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
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 	4 ( 325 326 327 328 ) ( -0 0 1 ) 8 ( 2679.2001953125 769.599609375 8 ) ( 2807.2001953125 897.599609375 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
-	4 ( 2537 -379 2536 324 ) ( 0 0 -1 ) 0 ( 2679.2001953125 -433.6000976562 0 ) ( 2807.2001953125 897.599609375 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
+	4 ( 2957 -379 2956 324 ) ( 0 0 -1 ) 0 ( 2679.2001953125 -433.6000976562 0 ) ( 2807.2001953125 897.599609375 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
+	4 ( 2970 2841 2969 2842 ) ( 0 0 1 ) 0 ( 568 4544 0 ) ( 1592 5056 0 ) "textures/common/caulk"
+	4 ( 2977 2844 2976 2843 ) ( 0 0 1 ) 0 ( 1592 4776 0 ) ( 2616 5056 0 ) "textures/common/caulk"
 	4 ( -14 20 -18 21 ) ( -0 1 0 ) 4776 ( 1386.400390625 4776 0 ) ( 2679.2001953125 4776 8 ) "textures/mars_citybuilder/mars_dirt"
 	4 ( 16 17 18 19 ) ( -0 0 1 ) 8 ( 1386.400390625 3252.7998046875 8 ) ( 2679.2001953125 4776 8 ) "textures/mars_citybuilder/mars_dirt"
 	4 ( 12 13 14 15 ) ( 0 0 -1 ) 0 ( 1386.400390625 3252.7998046875 0 ) ( 2679.2001953125 4776 0 ) "textures/mars_citybuilder/mars_dirt"
@@ -4712,12 +9169,14 @@ collisionModel "worldMap" {
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 	4 ( 1957 1958 -1953 1959 ) ( -0 -1 -0 ) -3252.7998046875 ( 858.400390625 3252.7998046875 8 ) ( 874.400390625 3252.7998046875 14 ) "textures/base_wall/steel"
 	4 ( 1953 1954 1955 1956 ) ( -0 0 1 ) 14 ( 858.400390625 3252.7998046875 14 ) ( 874.400390625 4776 14 ) "textures/base_wall/steel"
+	4 ( 2972 2840 2971 2839 ) ( 0 0 1 ) 0 ( -456 4776 0 ) ( 568 5056 0 ) "textures/common/caulk"
+	4 ( 2924 2837 2923 2838 ) ( 0 0 1 ) 0 ( -1480 4544 0 ) ( -456 5056 0 ) "textures/common/caulk"
 	4 ( -24 30 -28 31 ) ( -0 1 0 ) 4776 ( -546.3999023438 4776 0 ) ( 746.400390625 4776 8 ) "textures/mars_citybuilder/mars_dirt"
 	4 ( 26 27 28 29 ) ( -0 0 1 ) 8 ( -546.3999023438 3252.7998046875 8 ) ( 746.400390625 4776 8 ) "textures/mars_citybuilder/mars_dirt"
 	4 ( 22 23 24 25 ) ( 0 0 -1 ) 0 ( -546.3999023438 3252.7998046875 0 ) ( 746.400390625 4776 0 ) "textures/mars_citybuilder/mars_dirt"
 	4 ( 1108 1109 -1102 -1106 ) ( 1 0 0 ) 746.400390625 ( 746.400390625 3124.7998046875 8 ) ( 746.400390625 3140.7998046875 14 ) "textures/base_wall/steel"
 	4 ( 445 446 447 448 ) ( -0 0 1 ) 8 ( 746.400390625 3124.7998046875 8 ) ( 874.400390625 3252.7998046875 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
-	4 ( 2548 -674 2547 444 ) ( 0 0 -1 ) 0 ( -546.3999023438 3124.7998046875 0 ) ( 874.400390625 3252.7998046875 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
+	4 ( 2968 -674 2967 444 ) ( 0 0 -1 ) 0 ( -546.3999023438 3124.7998046875 0 ) ( 874.400390625 3252.7998046875 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
 	4 ( 1203 -468 1204 -702 ) ( -0 0 1 ) 8 ( -674.3999023438 2740.7998046875 8 ) ( 874.400390625 3124.7998046875 8 ) "textures/mars_citybuilder/mars_road_dusty_center"
 	4 ( 1201 -700 1202 -462 ) ( 0 0 -1 ) -0 ( -674.3999023438 2740.7998046875 0 ) ( 874.400390625 3124.7998046875 0 ) "textures/mars_citybuilder/mars_road_dusty_center"
 	4 ( 1125 -26 1126 -1110 ) ( -0 0 1 ) 8 ( -546.3999023438 3140.7998046875 8 ) ( 746.400390625 3252.7998046875 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
@@ -4737,7 +9196,7 @@ collisionModel "worldMap" {
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 	4 ( 1986 1987 -1979 -1985 ) ( -0 1 0 ) 2612.7998046875 ( 1258.400390625 2612.7998046875 8 ) ( 1274.400390625 2612.7998046875 14 ) "textures/base_wall/steel"
 	4 ( 451 452 453 454 ) ( -0 0 1 ) 8 ( 1258.400390625 2612.7998046875 8 ) ( 1386.400390625 2740.7998046875 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
-	4 ( 2544 -506 2543 449 ) ( 0 0 -1 ) 0 ( 1258.400390625 1409.599609375 0 ) ( 1386.400390625 2740.7998046875 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
+	4 ( 2964 -506 2963 449 ) ( 0 0 -1 ) 0 ( 1258.400390625 1409.599609375 0 ) ( 1386.400390625 2740.7998046875 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
 	4 ( 2001 -70 2002 -1984 ) ( -0 0 1 ) 8 ( 1274.400390625 1409.599609375 8 ) ( 1386.400390625 2612.7998046875 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
 	4 ( 1988 -1983 -1980 -1987 ) ( -1 0 0 ) -1258.400390625 ( 1258.400390625 1409.599609375 8 ) ( 1258.400390625 2612.7998046875 14 ) "textures/base_wall/steel"
 	4 ( 1984 1985 -1978 -1982 ) ( 1 0 0 ) 1274.400390625 ( 1274.400390625 1409.599609375 8 ) ( 1274.400390625 2612.7998046875 14 ) "textures/base_wall/steel"
@@ -4770,7 +9229,7 @@ collisionModel "worldMap" {
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 	4 ( -469 477 -473 478 ) ( -0 -1 -0 ) -797.599609375 ( 1297.400390625 797.599609375 140 ) ( 1307.400390625 797.599609375 164 ) "textures/base_wall/greenpanel1"
 	4 ( 519 520 521 522 ) ( -0 0 1 ) 8 ( 1258.400390625 769.599609375 8 ) ( 1386.400390625 897.599609375 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
-	4 ( 2528 537 -2108 517 ) ( 0 0 -1 ) 0 ( 1258.400390625 -561.6000976562 0 ) ( 1386.400390625 897.599609375 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
+	4 ( 2943 537 -2108 517 ) ( 0 0 -1 ) 0 ( 1258.400390625 -561.6000976562 0 ) ( 1386.400390625 897.599609375 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
 	4 ( 497 498 499 -494 ) ( 1 0 0 ) 1306.400390625 ( 1306.400390625 849.599609375 8 ) ( 1306.400390625 857.599609375 112 ) "textures/base_wall/steel"
 	4 ( -567 2109 -533 2110 ) ( -0 0 1 ) 8 ( 874.400390625 -561.6000976562 8 ) ( 1258.400390625 897.599609375 8 ) "textures/mars_citybuilder/mars_road_dusty_center_east_west"
 	4 ( -563 2107 -529 2108 ) ( 0 0 -1 ) 0 ( 874.400390625 -561.6000976562 0 ) ( 1258.400390625 897.599609375 0 ) "textures/mars_citybuilder/mars_road_dusty_center_east_west"
@@ -4781,7 +9240,7 @@ collisionModel "worldMap" {
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 	4 ( 1120 1121 -1114 -1118 ) ( 1 0 0 ) 746.400390625 ( 746.400390625 2724.7998046875 8 ) ( 746.400390625 2740.7998046875 14 ) "textures/base_wall/steel"
 	4 ( 457 458 459 460 ) ( -0 0 1 ) 8 ( 746.400390625 2612.7998046875 8 ) ( 874.400390625 2740.7998046875 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
-	4 ( 2541 -686 2540 456 ) ( 0 0 -1 ) 0 ( -546.3999023438 2612.7998046875 0 ) ( 874.400390625 2740.7998046875 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
+	4 ( 2961 -686 2960 456 ) ( 0 0 -1 ) 0 ( -546.3999023438 2612.7998046875 0 ) ( 874.400390625 2740.7998046875 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
 	4 ( 1996 1997 -1990 -1994 ) ( 1 0 0 ) 874.400390625 ( 874.400390625 1409.599609375 8 ) ( 874.400390625 2612.7998046875 14 ) "textures/base_wall/steel"
 	4 ( 2004 -2000 2005 -76 ) ( -0 0 1 ) 8 ( 746.400390625 1409.599609375 8 ) ( 858.400390625 2612.7998046875 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
 	4 ( -511 -74 -455 2003 ) ( 0 0 -1 ) 0 ( 746.400390625 1409.599609375 0 ) ( 874.400390625 2612.7998046875 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
@@ -4796,13 +9255,13 @@ collisionModel "worldMap" {
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 	4 ( 513 514 515 516 ) ( -0 0 1 ) 8 ( 746.400390625 1281.599609375 8 ) ( 874.400390625 1409.599609375 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
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+	4 ( 2959 -706 2958 512 ) ( 0 0 -1 ) 0 ( -546.3999023438 1281.599609375 0 ) ( 874.400390625 1409.599609375 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
 	4 ( 1385 -536 1386 -734 ) ( -0 0 1 ) 8 ( -674.3999023438 897.599609375 8 ) ( 874.400390625 1281.599609375 8 ) "textures/mars_citybuilder/mars_road_dusty_center"
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+	4 ( 2938 -543 2937 524 ) ( 0 0 -1 ) 0 ( 746.400390625 -433.6000976562 0 ) ( 874.400390625 897.599609375 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
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@@ -4844,7 +9303,7 @@ collisionModel "worldMap" {
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 	4 ( 381 382 383 384 ) ( -0 0 1 ) 8 ( 2679.2001953125 -561.6000976562 8 ) ( 2807.2001953125 -433.6000976562 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
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+	4 ( 2945 -538 2944 380 ) ( 0 0 -1 ) 0 ( 1386.400390625 -561.6000976562 0 ) ( 2807.2001953125 -433.6000976562 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
 	4 ( 1561 -404 1562 -566 ) ( -0 0 1 ) 8 ( 1258.400390625 -945.6000976562 8 ) ( 2807.2001953125 -561.6000976562 8 ) "textures/mars_citybuilder/mars_road_dusty_center"
 	4 ( 1559 -564 1560 -398 ) ( 0 0 -1 ) 0 ( 1258.400390625 -945.6000976562 0 ) ( 2807.2001953125 -561.6000976562 0 ) "textures/mars_citybuilder/mars_road_dusty_center"
 	4 ( -1428 1431 1432 -149 ) ( 1 0 0 ) 4932 ( 4932 -1073.6000976562 0 ) ( 4932 -945.6000976562 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
@@ -4870,7 +9329,7 @@ collisionModel "worldMap" {
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 	4 ( 387 388 389 390 ) ( -0 0 1 ) 8 ( 3191.2001953125 -1073.6000976562 8 ) ( 3319.2001953125 -945.6000976562 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
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+	4 ( 2954 -406 2953 385 ) ( 0 0 -1 ) 0 ( 3191.2001953125 -2276.8000488281 0 ) ( 3319.2001953125 -945.6000976562 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
 	4 ( 365 366 367 -362 ) ( 1 0 0 ) 3239.2001953125 ( 3239.2001953125 -993.6000976562 8 ) ( 3239.2001953125 -985.6000976562 112 ) "textures/base_wall/steel"
 	4 ( -435 1933 -401 1934 ) ( -0 0 1 ) 8 ( 2807.2001953125 -2404.8000488281 8 ) ( 3191.2001953125 -945.6000976562 8 ) "textures/mars_citybuilder/mars_road_dusty_center_east_west"
 	4 ( -431 1931 -397 1932 ) ( 0 0 -1 ) 0 ( 2807.2001953125 -2404.8000488281 0 ) ( 3191.2001953125 -945.6000976562 0 ) "textures/mars_citybuilder/mars_road_dusty_center_east_west"
@@ -4881,7 +9340,7 @@ collisionModel "worldMap" {
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 	4 ( 1452 1453 -1446 -1450 ) ( 1 0 0 ) 2679.2001953125 ( 2679.2001953125 -961.6000366211 8 ) ( 2679.2001953125 -945.6000366211 14 ) "textures/base_wall/steel"
 	4 ( 393 394 395 396 ) ( -0 0 1 ) 8 ( 2679.2001953125 -1073.6000976562 8 ) ( 2807.2001953125 -945.6000976562 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
-	4 ( 2527 -550 2526 392 ) ( 0 0 -1 ) 0 ( 1386.400390625 -1073.6000976562 0 ) ( 2807.2001953125 -945.6000976562 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
+	4 ( 2942 -550 2941 392 ) ( 0 0 -1 ) 0 ( 1386.400390625 -1073.6000976562 0 ) ( 2807.2001953125 -945.6000976562 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
 	4 ( 1873 -148 1874 -1856 ) ( -0 0 1 ) 8 ( 3207.2001953125 -2276.8000488281 8 ) ( 3319.2001953125 -1073.6000976562 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
 	4 ( 1860 -1855 -1852 -1859 ) ( -1 0 0 ) -3191.2001953125 ( 3191.2001953125 -2276.8000488281 8 ) ( 3191.2001953125 -1073.6000976562 14 ) "textures/base_wall/steel"
 	4 ( 1856 1857 -1850 -1854 ) ( 1 0 0 ) 3207.2001953125 ( 3207.2001953125 -2276.8000488281 8 ) ( 3207.2001953125 -1073.6000976562 14 ) "textures/base_wall/steel"
@@ -4895,7 +9354,7 @@ collisionModel "worldMap" {
 	4 ( 1861 1862 1863 1864 ) ( -0 0 1 ) 14 ( 2791.2001953125 -2276.8000488281 14 ) ( 2807.2001953125 -1073.6000976562 14 ) "textures/base_wall/steel"
 	4 ( -1601 -150 1604 1605 ) ( 1 0 0 ) 4932 ( 4932 -2404.8000488281 0 ) ( 4932 -2276.8000488281 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
 	4 ( 1602 -145 1603 -1586 ) ( -0 0 1 ) 8 ( 3319.2001953125 -2388.8000488281 8 ) ( 4932 -2276.8000488281 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
-	4 ( -1734 405 2532 1601 ) ( 0 0 -1 ) 0 ( 3191.2001953125 -2404.8000488281 0 ) ( 4932 -2276.8000488281 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
+	4 ( -1734 405 2947 1601 ) ( 0 0 -1 ) 0 ( 3191.2001953125 -2404.8000488281 0 ) ( 4932 -2276.8000488281 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
 	4 ( 1588 -1583 -1580 -1587 ) ( -1 0 0 ) -3319.2001953125 ( 3319.2001953125 -2404.8000488281 8 ) ( 3319.2001953125 -2388.8000488281 14 ) "textures/base_wall/steel"
 	4 ( 1586 1587 -1579 -1585 ) ( -0 1 0 ) -2388.8000488281 ( 3319.2001953125 -2388.8000488281 8 ) ( 4932 -2388.8000488281 14 ) "textures/base_wall/steel"
 	4 ( 1584 1585 -1578 -1582 ) ( 1 0 0 ) 4932 ( 4932 -2404.8000488281 8 ) ( 4932 -2388.8000488281 14 ) "textures/base_wall/steel"
@@ -4912,6 +9371,11 @@ collisionModel "worldMap" {
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 	4 ( 1589 1590 1591 1592 ) ( -0 0 1 ) 14 ( 3319.2001953125 -2804.8000488281 14 ) ( 4932 -2788.8000488281 14 ) "textures/base_wall/steel"
+	4 ( 2950 2511 2949 2510 ) ( 0 0 1 ) 0 ( 4664 -4672 0 ) ( 11832 -4160 0 ) "textures/common/caulk"
+	4 ( 2952 2509 2951 2508 ) ( 0 0 1 ) 0 ( 3640 -4672 0 ) ( 4664 -4424 0 ) "textures/common/caulk"
+	4 ( -2489 2505 2506 2507 ) ( 0 0 1 ) 0 ( 3128 -4672 0 ) ( 3640 -4160 0 ) "textures/common/caulk"
+	4 ( 2855 2487 2854 2490 ) ( 0 0 1 ) 0 ( -4552 -5184 0 ) ( 11832 -4672 0 ) "textures/common/caulk"
+	4 ( 2862 2860 2861 2859 ) ( 0 0 1 ) 0 ( -20936 -19008 0 ) ( 11832 -5184 0 ) "textures/common/caulk"
 	4 ( 1909 -194 1910 -1906 ) ( 1 0 0 ) 3319.2001953125 ( 3319.2001953125 -4440 0 ) ( 3319.2001953125 -4424 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
 	4 ( -188 195 -190 -193 ) ( 1 0 0 ) 4932 ( 4932 -4424 0 ) ( 4932 -2916.8000488281 8 ) "textures/mars_citybuilder/mars_dirt"
 	4 ( -185 193 -189 194 ) ( -0 -1 -0 ) 4424 ( 3319.2001953125 -4424 0 ) ( 4932 -4424 8 ) "textures/mars_citybuilder/mars_dirt"
@@ -4922,10 +9386,10 @@ collisionModel "worldMap" {
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 	4 ( 1887 1888 -1880 -1886 ) ( -0 1 0 ) -2916.8000488281 ( 3191.2001953125 -2916.8000488281 8 ) ( 3207.2001953125 -2916.8000488281 14 ) "textures/base_wall/steel"
 	4 ( 419 420 421 422 ) ( -0 0 1 ) 8 ( 3191.2001953125 -2916.8000488281 8 ) ( 3319.2001953125 -2788.8000488281 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
-	4 ( 2531 1902 -1937 417 ) ( 0 0 -1 ) 0 ( 3191.2001953125 -4440 0 ) ( 3319.2001953125 -2788.8000488281 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
+	4 ( 2946 1902 -1937 417 ) ( 0 0 -1 ) 0 ( 3191.2001953125 -4440 0 ) ( 3319.2001953125 -2788.8000488281 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
 	4 ( 1619 1620 -1613 -1617 ) ( 1 0 0 ) 2679.2001953125 ( 2679.2001953125 -2404.7998046875 8 ) ( 2679.2001953125 -2388.7998046875 14 ) "textures/base_wall/steel"
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-	4 ( -1740 605 2515 412 ) ( 0 0 -1 ) 0 ( 1258.400390625 -2404.8000488281 0 ) ( 2807.2001953125 -2276.8000488281 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
+	4 ( -1740 605 2930 412 ) ( 0 0 -1 ) 0 ( 1258.400390625 -2404.8000488281 0 ) ( 2807.2001953125 -2276.8000488281 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
 	4 ( 1741 -436 1742 -634 ) ( -0 0 1 ) 8 ( 1258.400390625 -2788.8000488281 8 ) ( 2807.2001953125 -2404.8000488281 8 ) "textures/mars_citybuilder/mars_road_dusty_center"
 	4 ( 1739 -632 1740 -430 ) ( 0 0 -1 ) 0 ( 1258.400390625 -2788.8000488281 0 ) ( 2807.2001953125 -2404.8000488281 0 ) "textures/mars_citybuilder/mars_road_dusty_center"
 	4 ( 1631 1632 -1625 -1629 ) ( 1 0 0 ) 2679.2001953125 ( 2679.2001953125 -2804.7998046875 8 ) ( 2679.2001953125 -2788.7998046875 14 ) "textures/base_wall/steel"
@@ -4933,13 +9397,14 @@ collisionModel "worldMap" {
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 	4 ( 1899 1900 -1892 -1898 ) ( -0 1 0 ) -2916.8000488281 ( 2791.2001953125 -2916.8000488281 8 ) ( 2807.2001953125 -2916.8000488281 14 ) "textures/base_wall/steel"
 	4 ( 425 426 427 428 ) ( -0 0 1 ) 8 ( 2679.2001953125 -2916.8000488281 8 ) ( 2807.2001953125 -2788.8000488281 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
-	4 ( 2517 -618 2516 424 ) ( 0 0 -1 ) 0 ( 1386.400390625 -2916.8000488281 0 ) ( 2807.2001953125 -2788.8000488281 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
+	4 ( 2932 -618 2931 424 ) ( 0 0 -1 ) 0 ( 1386.400390625 -2916.8000488281 0 ) ( 2807.2001953125 -2788.8000488281 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
 	4 ( -1902 1906 1907 1908 ) ( -0 -1 -0 ) 4440 ( 3191.2001953125 -4440 0 ) ( 3319.2001953125 -4440 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
 	4 ( 1903 1904 1905 -1885 ) ( -0 0 1 ) 8 ( 3207.2001953125 -4440 8 ) ( 3319.2001953125 -2916.8000488281 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
 	4 ( 1889 -1884 -1881 -1888 ) ( -1 0 0 ) -3191.2001953125 ( 3191.2001953125 -4440 8 ) ( 3191.2001953125 -2916.8000488281 14 ) "textures/base_wall/steel"
 	4 ( 1885 1886 -1879 -1883 ) ( 1 0 0 ) 3207.2001953125 ( 3207.2001953125 -4440 8 ) ( 3207.2001953125 -2916.8000488281 14 ) "textures/base_wall/steel"
 	4 ( 1882 1883 -1878 1884 ) ( -0 -1 -0 ) 4440 ( 3191.2001953125 -4440 8 ) ( 3207.2001953125 -4440 14 ) "textures/base_wall/steel"
 	4 ( 1878 1879 1880 1881 ) ( -0 0 1 ) 14 ( 3191.2001953125 -4440 14 ) ( 3207.2001953125 -2916.8000488281 14 ) "textures/base_wall/steel"
+	4 ( 2853 2503 2852 2504 ) ( 0 0 1 ) 0 ( -4040 -4672 0 ) ( 3128 -4439.9995117188 0 ) "textures/common/caulk"
 	4 ( -1935 -1908 -1938 -1915 ) ( -0 -1 -0 ) 4440 ( 2807.1999511719 -4440 0 ) ( 3191.1999511719 -4440 8 ) "textures/mars_citybuilder/mars_road_dusty_center_east_west"
 	4 ( 1897 1898 -1891 -1895 ) ( 1 0 0 ) 2807.2001953125 ( 2807.2001953125 -4440 8 ) ( 2807.2001953125 -2916.8000488281 14 ) "textures/base_wall/steel"
 	4 ( -1911 1915 1916 -204 ) ( -0 -1 -0 ) 4440 ( 2679.2001953125 -4440 0 ) ( 2807.2001953125 -4440 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
@@ -4973,7 +9438,7 @@ collisionModel "worldMap" {
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 	4 ( 551 552 553 554 ) ( -0 0 1 ) 8 ( 1258.400390625 -1073.6000976562 8 ) ( 1386.400390625 -945.6000976562 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
-	4 ( 2525 -606 2524 549 ) ( 0 0 -1 ) 0 ( 1258.400390625 -2276.8000488281 0 ) ( 1386.400390625 -945.6000976562 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
+	4 ( 2940 -606 2939 549 ) ( 0 0 -1 ) 0 ( 1258.400390625 -2276.8000488281 0 ) ( 1386.400390625 -945.6000976562 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
 	4 ( -635 2113 -565 2114 ) ( -0 0 1 ) 8 ( 874.400390625 -2404.8000488281 8 ) ( 1258.400390625 -945.6000976562 8 ) "textures/mars_citybuilder/mars_road_dusty_center_east_west"
 	4 ( -631 2111 -561 2112 ) ( 0 0 -1 ) 0 ( 874.400390625 -2404.8000488281 0 ) ( 1258.400390625 -945.6000976562 0 ) "textures/mars_citybuilder/mars_road_dusty_center_east_west"
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@@ -4990,7 +9455,7 @@ collisionModel "worldMap" {
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 	4 ( 545 546 547 548 ) ( -0 0 1 ) 8 ( 746.400390625 -561.6000976562 8 ) ( 874.400390625 -433.6000976562 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
-	4 ( 2521 -774 2520 544 ) ( 0 0 -1 ) -0 ( -546.3999023438 -561.6000976562 0 ) ( 874.400390625 -433.6000976562 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
+	4 ( 2936 -774 2935 544 ) ( 0 0 -1 ) -0 ( -546.3999023438 -561.6000976562 0 ) ( 874.400390625 -433.6000976562 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
 	4 ( 1565 -568 1566 -802 ) ( -0 0 1 ) 8 ( -674.3999023438 -945.6000976562 8 ) ( 874.400390625 -561.6000976562 8 ) "textures/mars_citybuilder/mars_road_dusty_center"
 	4 ( 1563 -800 1564 -562 ) ( 0 0 -1 ) -0 ( -674.3999023438 -945.6000976562 0 ) ( 874.400390625 -561.6000976562 0 ) "textures/mars_citybuilder/mars_road_dusty_center"
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@@ -5002,7 +9467,7 @@ collisionModel "worldMap" {
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 	4 ( 557 558 559 560 ) ( -0 0 1 ) 8 ( 746.400390625 -1073.6000976562 8 ) ( 874.400390625 -945.6000976562 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
-	4 ( 2519 -786 2518 556 ) ( 0 0 -1 ) -0 ( -546.3999023438 -1073.6000976562 0 ) ( 874.400390625 -945.6000976562 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
+	4 ( 2934 -786 2933 556 ) ( 0 0 -1 ) -0 ( -546.3999023438 -1073.6000976562 0 ) ( 874.400390625 -945.6000976562 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
 	4 ( 2061 -2057 2062 -164 ) ( -0 0 1 ) 8 ( 746.400390625 -2276.8000488281 8 ) ( 858.400390625 -1073.6000976562 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
 	4 ( -611 -162 -555 2060 ) ( 0 0 -1 ) 0 ( 746.400390625 -2276.8000488281 0 ) ( 874.400390625 -1073.6000976562 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
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@@ -5040,7 +9505,7 @@ collisionModel "worldMap" {
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 	4 ( 619 620 621 622 ) ( -0 0 1 ) 8 ( 1258.400390625 -2916.8000488281 8 ) ( 1386.400390625 -2788.8000488281 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
-	4 ( 2514 2087 -2117 617 ) ( 0 0 -1 ) 0 ( 1258.400390625 -4440 0 ) ( 1386.400390625 -2788.8000488281 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
+	4 ( 2929 2087 -2117 617 ) ( 0 0 -1 ) 0 ( 1258.400390625 -4440 0 ) ( 1386.400390625 -2788.8000488281 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
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 	4 ( 2118 2119 -633 2120 ) ( -0 0 1 ) 8 ( 874.4003295898 -4440 8 ) ( 1258.4002685547 -2788.8000488281 8 ) "textures/mars_citybuilder/mars_road_dusty_center_east_west"
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@@ -5060,13 +9525,13 @@ collisionModel "worldMap" {
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 	4 ( 613 614 615 616 ) ( -0 0 1 ) 8 ( 746.400390625 -2404.8000488281 8 ) ( 874.400390625 -2276.8000488281 8 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
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+	4 ( 2928 -806 2927 612 ) ( 0 0 -1 ) -0 ( -546.3999023438 -2404.8000488281 0 ) ( 874.400390625 -2276.8000488281 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
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+	4 ( -2116 2092 2926 624 ) ( 0 0 -1 ) 0 ( 746.400390625 -4440 0 ) ( 874.400390625 -2788.8000488281 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
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@@ -5089,7 +9554,7 @@ collisionModel "worldMap" {
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+	4 ( 2925 673 -2277 2145 ) ( 0 0 -1 ) 0 ( -674.3999023438 3124.7998046875 0 ) ( -546.3999023438 4776 0 ) "textures/mars_citybuilder/mars_sidewalk_dusty"
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 	4 ( -226 234 -230 235 ) ( -0 -1 -0 ) 4440 ( -4732 -4440 0 ) ( -3119.1999511719 -4440 8 ) "textures/mars_citybuilder/mars_dirt"
 	4 ( 230 231 232 233 ) ( -0 0 1 ) 8 ( -4732 -4440 8 ) ( -3119.1999511719 -2916.8000488281 8 ) "textures/mars_citybuilder/mars_dirt"
diff --git a/base/maps/testmaps/test_city.iceproc b/base/maps/testmaps/test_city.iceproc
index 836296c8..fb61a5d9 100644
--- a/base/maps/testmaps/test_city.iceproc
+++ b/base/maps/testmaps/test_city.iceproc
@@ -304,7 +304,7 @@ raytraceSurface { flags 0 area 0 averageColor ( 0.598469913 0.2692296207 0.14538
 398 392 395 398 397 399 400 401 402 400 402 403 404 403 402 404 405 406 
 404 402 405 407 404 406 407 406 401 407 401 400 408 409 410 411 409 408 
 412 411 408 413 408 410 413 410 414 415 413 414 415 414 411 415 411 412 
-raytraceSurface { flags 0 area 0 averageColor ( 0.0069852942 0.0334087573 0.0969551355 0.0984445289 )  emissive ( 0 0 0 0 )  bounds ( -2619.1875 -2888.8125 112 3291.1875 2752.8125 164 )  }
+raytraceSurface { flags 0 area 0 averageColor ( 0.8039238453 0.8039238453 0.8039238453 0.8039238453 )  emissive ( 0 0 0 0 )  bounds ( -2619.1875 -2888.8125 112 3291.1875 2752.8125 164 )  }
 }
 
 /* surface 2 */ { "textures/base_wall/steel" /* numVerts = */ 1728 /* numIndexes = */ 2592
diff --git a/base/maps/testmaps/test_city.map b/base/maps/testmaps/test_city.map
index 4adb4ec2..dee7fbf8 100644
--- a/base/maps/testmaps/test_city.map
+++ b/base/maps/testmaps/test_city.map
@@ -3956,13 +3956,13 @@ Version 2
 "classname" "light"
 "origin" "-3200 3336 3360"
 "name" "light_1"
-"_color" "0.949 0.627 0.510"
+"_color" "0.949 0.627 0.51"
 "light_radius" "300000 300000 300000"
 }
 // entity 2
 {
 "classname" "info_player_start"
-"origin" "-4548 -2616 8"
+"origin" "-3764 -2592 64"
 "name" "info_player_start_1"
 }
 // entity 3
diff --git a/base/maps/testmaps/test_city.terrain b/base/maps/testmaps/test_city.terrain
new file mode 100644
index 00000000..b78f4c12
--- /dev/null
+++ b/base/maps/testmaps/test_city.terrain
@@ -0,0 +1,338 @@
+terrainAuthoring 3 {
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diff --git a/base/textures/uac_city_buildings/B4_COMMUNICATIONS_albedo.png b/base/textures/uac_city_buildings/B4_COMMUNICATIONS_albedo.png
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diff --git a/base/textures/uac_city_buildings/C3_HOTEL_albedo.png b/base/textures/uac_city_buildings/C3_HOTEL_albedo.png
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diff --git a/base/textures/uac_city_buildings/C4_PARKING_STRUCTURE_albedo.png b/base/textures/uac_city_buildings/C4_PARKING_STRUCTURE_albedo.png
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diff --git a/base/textures/uac_city_buildings/C4_PARKING_STRUCTURE_normal.png b/base/textures/uac_city_buildings/C4_PARKING_STRUCTURE_normal.png
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diff --git a/base/textures/uac_city_buildings/C4_PARKING_STRUCTURE_specular.png b/base/textures/uac_city_buildings/C4_PARKING_STRUCTURE_specular.png
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diff --git a/neo/engine/cm/CollisionModel.h b/neo/engine/cm/CollisionModel.h
index f1df5d18..864cf172 100644
--- a/neo/engine/cm/CollisionModel.h
+++ b/neo/engine/cm/CollisionModel.h
@@ -89,7 +89,7 @@ public:
 	virtual					~idCollisionModelManager( void ) {}
 
 	// Loads collision models from a map file.
-	virtual void			LoadMap( const idMapFile *mapFile ) = 0;
+	virtual void			LoadMap( const idMapFile *mapFile, bool bakeTerrain = false ) = 0;
 	// Frees all the collision models.
 	virtual void			FreeMap( void ) = 0;
 
diff --git a/neo/engine/cm/CollisionModel_load.cpp b/neo/engine/cm/CollisionModel_load.cpp
index 11ecdfdb..680b98f5 100644
--- a/neo/engine/cm/CollisionModel_load.cpp
+++ b/neo/engine/cm/CollisionModel_load.cpp
@@ -49,6 +49,7 @@ If you have questions concerning this license or the applicable additional terms
 #pragma hdrstop
 
 #include "CollisionModel_local.h"
+#include "../models/TerrainModel.h"
 
 
 idCollisionModelManagerLocal	collisionModelManagerLocal;
@@ -2577,6 +2578,160 @@ void idCollisionModelManagerLocal::CreatePatchPolygons( cm_model_t *model, idSur
 	}
 }
 
+/*
+=================
+idCollisionModelManagerLocal::CreateTerrainPolygons
+=================
+*/
+void idCollisionModelManagerLocal::CreateTerrainPolygons( cm_model_t *model, const idTerrainPatch &terrain, const idMaterial *material, int primitiveNum ) {
+	int x, y;
+	float dot;
+	idFixedWinding w;
+	idPlane plane;
+	idVec3 d1, d2;
+	idVec3 v1, v2, v3, v4;
+
+	for ( y = 0; y < terrain.height - 1; y++ ) {
+		for ( x = 0; x < terrain.width - 1; x++ ) {
+			v1 = terrain.Vertex( x, y );
+			v2 = terrain.Vertex( x + 1, y );
+			v3 = terrain.Vertex( x + 1, y + 1 );
+			v4 = terrain.Vertex( x, y + 1 );
+
+			d1 = v2 - v1;
+			d2 = v3 - v1;
+			plane.SetNormal( d1.Cross( d2 ) );
+			if ( plane.Normalize() != 0.0f ) {
+				plane.FitThroughPoint( v1 );
+				dot = plane.Distance( v4 );
+				if ( idMath::Fabs( dot ) < 0.1f ) {
+					w.Clear();
+					w += v1;
+					w += v2;
+					w += v3;
+					w += v4;
+
+					PolygonFromWinding( model, &w, plane, material, -primitiveNum );
+					continue;
+				} else {
+					w.Clear();
+					w += v1;
+					w += v2;
+					w += v3;
+
+					PolygonFromWinding( model, &w, plane, material, -primitiveNum );
+				}
+			}
+
+			d1 = v3 - v1;
+			d2 = v4 - v1;
+			plane.SetNormal( d1.Cross( d2 ) );
+			if ( plane.Normalize() != 0.0f ) {
+				plane.FitThroughPoint( v1 );
+
+				w.Clear();
+				w += v1;
+				w += v3;
+				w += v4;
+
+				PolygonFromWinding( model, &w, plane, material, -primitiveNum );
+			}
+		}
+	}
+}
+
+/*
+=================
+idCollisionModelManagerLocal::LoadTerrainForMap
+=================
+*/
+bool idCollisionModelManagerLocal::LoadTerrainForMap( const idMapFile *mapFile, idTerrainModel &terrainModel ) {
+	if ( !mapFile ) {
+		return false;
+	}
+
+	idStr terrainFile = idTerrainModel::FileNameForMap( mapFile->GetName() );
+	ID_TIME_T terrainTimeStamp;
+	fileSystem->ReadFile( terrainFile, NULL, &terrainTimeStamp );
+	if ( terrainTimeStamp == FILE_NOT_FOUND_TIMESTAMP ) {
+		return false;
+	}
+
+	if ( !terrainModel.LoadFile( terrainFile.c_str(), "textures/common/caulk" ) ) {
+		common->Warning( "idCollisionModelManagerLocal::LoadTerrainForMap: failed to load %s", terrainFile.c_str() );
+		return false;
+	}
+
+	for ( int i = 0; i < terrainModel.NumTerrains(); i++ ) {
+		idTerrainPatch *terrain = terrainModel.Terrain( i );
+		if ( !terrain ) {
+			continue;
+		}
+		terrain->EnsureLayerData( "textures/common/caulk" );
+		terrain->UpdateBounds();
+	}
+	return terrainModel.NumTerrains() > 0;
+}
+
+/*
+=================
+CM_EstimateTerrainVertsAndEdges
+=================
+*/
+static void CM_EstimateTerrainVertsAndEdges( const idTerrainModel &terrainModel, int *numVerts, int *numEdges ) {
+	for ( int i = 0; i < terrainModel.NumTerrains(); i++ ) {
+		const idTerrainPatch *terrain = terrainModel.Terrain( i );
+		if ( !terrain || terrain->width < 2 || terrain->height < 2 ) {
+			continue;
+		}
+		*numVerts += terrain->width * terrain->height;
+		*numEdges += ( terrain->width - 1 ) * terrain->height + terrain->width * ( terrain->height - 1 ) + ( terrain->width - 1 ) * ( terrain->height - 1 );
+	}
+}
+
+/*
+=================
+CM_AddTerrainBounds
+=================
+*/
+static void CM_AddTerrainBounds( idBounds &bounds, const idTerrainModel &terrainModel ) {
+	for ( int i = 0; i < terrainModel.NumTerrains(); i++ ) {
+		const idTerrainPatch *terrain = terrainModel.Terrain( i );
+		if ( !terrain ) {
+			continue;
+		}
+		bounds.AddPoint( terrain->bounds[0] );
+		bounds.AddPoint( terrain->bounds[1] );
+	}
+}
+
+/*
+=================
+idCollisionModelManagerLocal::AddTerrainToModel
+=================
+*/
+int idCollisionModelManagerLocal::AddTerrainToModel( cm_model_t *model, idTerrainModel &terrainModel ) {
+	static const int TERRAIN_COLLISION_PRIMITIVE_BASE = 1000000;
+	const idMaterial *solidMaterial = declManager->FindMaterial( "textures/common/caulk" );
+	const int startPolygons = model->numPolygons;
+
+	for ( int i = 0; i < terrainModel.NumTerrains(); i++ ) {
+		idTerrainPatch *terrain = terrainModel.Terrain( i );
+		if ( !terrain ) {
+			continue;
+		}
+
+		terrain->EnsureLayerData( "textures/common/caulk" );
+		const idMaterial *material = declManager->FindMaterial( terrain->material.c_str() );
+		if ( !( material->GetContentFlags() & CONTENTS_REMOVE_UTIL ) ) {
+			material = solidMaterial;
+		}
+		CreateTerrainPolygons( model, *terrain, material, TERRAIN_COLLISION_PRIMITIVE_BASE + i );
+	}
+
+	return model->numPolygons - startPolygons;
+}
+
 /*
 =================
 CM_EstimateVertsAndEdges
@@ -3077,14 +3232,16 @@ cm_model_t *idCollisionModelManagerLocal::LoadRenderModel( const char *fileName
 idCollisionModelManagerLocal::CollisionModelForMapEntity
 ================
 */
-cm_model_t *idCollisionModelManagerLocal::CollisionModelForMapEntity( const idMapEntity *mapEnt ) {
+cm_model_t *idCollisionModelManagerLocal::CollisionModelForMapEntity( const idMapEntity *mapEnt, const idMapFile *mapFile, bool bakeTerrain ) {
 	cm_model_t *model;
 	idBounds bounds;
 	const char *name;
 	int i, brushCount;
+	idTerrainModel terrainModel;
+	const bool addTerrain = bakeTerrain && LoadTerrainForMap( mapFile, terrainModel );
 
 	// if the entity has no primitives
-	if ( mapEnt->GetNumPrimitives() < 1 ) {
+	if ( mapEnt->GetNumPrimitives() < 1 && !addTerrain ) {
 		return NULL;
 	}
 
@@ -3107,6 +3264,15 @@ cm_model_t *idCollisionModelManagerLocal::CollisionModelForMapEntity( const idMa
 	model->node = AllocNode( model, NODE_BLOCK_SIZE_SMALL );
 
 	CM_EstimateVertsAndEdges( mapEnt, &model->maxVertices, &model->maxEdges );
+	if ( addTerrain ) {
+		CM_EstimateTerrainVertsAndEdges( terrainModel, &model->maxVertices, &model->maxEdges );
+	}
+	if ( model->maxVertices < 1 ) {
+		model->maxVertices = 1;
+	}
+	if ( model->maxEdges < 2 ) {
+		model->maxEdges = 2;
+	}
 	model->numVertices = 0;
 	model->numEdges = 0;
 	model->vertices = (cm_vertex_t *) Mem_ClearedAlloc( model->maxVertices * sizeof(cm_vertex_t) );
@@ -3141,6 +3307,12 @@ cm_model_t *idCollisionModelManagerLocal::CollisionModelForMapEntity( const idMa
 	if ( brushCount ) {
 		CM_GetNodeBounds( &bounds, model->node );
 	} else {
+		bounds.Clear();
+	}
+	if ( addTerrain ) {
+		CM_AddTerrainBounds( bounds, terrainModel );
+	}
+	if ( bounds.IsCleared() ) {
 		bounds[0].Set( -256, -256, -256 );
 		bounds[1].Set( 256, 256, 256 );
 	}
@@ -3162,6 +3334,10 @@ cm_model_t *idCollisionModelManagerLocal::CollisionModelForMapEntity( const idMa
 			continue;
 		}
 	}
+	if ( addTerrain ) {
+		const int addedPolygons = AddTerrainToModel( model, terrainModel );
+		common->Printf( "baked %i terrain collision polygons into %s\n", addedPolygons, model->name.c_str() );
+	}
 
 	FinishModel( model );
 
@@ -3283,14 +3459,14 @@ void idCollisionModelManagerLocal::ListModels( void ) {
 idCollisionModelManagerLocal::BuildModels
 ================
 */
-void idCollisionModelManagerLocal::BuildModels( const idMapFile *mapFile ) {
+void idCollisionModelManagerLocal::BuildModels( const idMapFile *mapFile, bool bakeTerrain ) {
 	int i;
 	const idMapEntity *mapEnt;
 
 	idTimer timer;
 	timer.Start();
 
-	if ( !LoadCollisionModelFile( mapFile->GetName(), mapFile->GetGeometryCRC() ) ) {
+	if ( bakeTerrain || !LoadCollisionModelFile( mapFile->GetName(), mapFile->GetGeometryCRC() ) ) {
 
 		if ( !mapFile->GetNumEntities() ) {
 			return;
@@ -3307,7 +3483,7 @@ void idCollisionModelManagerLocal::BuildModels( const idMapFile *mapFile ) {
 				common->Error( "idCollisionModelManagerLocal::BuildModels: more than %d collision models", MAX_SUBMODELS );
 				break;
 			}
-			models[numModels] = CollisionModelForMapEntity( mapEnt );
+			models[numModels] = CollisionModelForMapEntity( mapEnt, mapFile, bakeTerrain && numModels == 0 );
 			if ( models[ numModels] ) {
 				numModels++;
 			}
@@ -3338,7 +3514,7 @@ void idCollisionModelManagerLocal::BuildModels( const idMapFile *mapFile ) {
 idCollisionModelManagerLocal::LoadMap
 ================
 */
-void idCollisionModelManagerLocal::LoadMap( const idMapFile *mapFile ) {
+void idCollisionModelManagerLocal::LoadMap( const idMapFile *mapFile, bool bakeTerrain ) {
 
 	if ( mapFile == NULL ) {
 		common->Error( "idCollisionModelManagerLocal::LoadMap: NULL mapFile" );
@@ -3347,7 +3523,7 @@ void idCollisionModelManagerLocal::LoadMap( const idMapFile *mapFile ) {
 	// check whether we can keep the current collision map based on the mapName and mapFileTime
 	if ( loaded ) {
 		if ( mapName.Icmp( mapFile->GetName() ) == 0 ) {
-			if ( mapFile->GetFileTime() == mapFileTime ) {
+			if ( !bakeTerrain && mapFile->GetFileTime() == mapFileTime ) {
 				common->DPrintf( "Using loaded version\n" );
 				return;
 			}
@@ -3371,7 +3547,7 @@ void idCollisionModelManagerLocal::LoadMap( const idMapFile *mapFile ) {
 	SetupTrmModelStructure();
 
 	// build collision models
-	BuildModels( mapFile );
+	BuildModels( mapFile, bakeTerrain );
 
 	// save name and time stamp
 	mapName = mapFile->GetName();
diff --git a/neo/engine/cm/CollisionModel_local.h b/neo/engine/cm/CollisionModel_local.h
index f77d34b7..8d984f94 100644
--- a/neo/engine/cm/CollisionModel_local.h
+++ b/neo/engine/cm/CollisionModel_local.h
@@ -36,6 +36,9 @@ If you have questions concerning this license or the applicable additional terms
 
 #include "CollisionModel.h"
 
+class idTerrainModel;
+class idTerrainPatch;
+
 #define MIN_NODE_SIZE						64.0f
 #define MAX_NODE_POLYGONS					128
 #define CM_MAX_POLYGON_EDGES				64
@@ -293,7 +296,7 @@ typedef struct cm_procNode_s {
 class idCollisionModelManagerLocal : public idCollisionModelManager {
 public:
 	// load collision models from a map file
-	void			LoadMap( const idMapFile *mapFile );
+	void			LoadMap( const idMapFile *mapFile, bool bakeTerrain = false );
 	// frees all the collision models
 	void			FreeMap( void );
 
@@ -458,6 +461,9 @@ private:			// CollisionMap_load.cpp
 	void			PolygonFromWinding( cm_model_t *model, idFixedWinding *w, const idPlane &plane, const idMaterial *material, int primitiveNum );
 	void			CalculateEdgeNormals( cm_model_t *model, cm_node_t *node );
 	void			CreatePatchPolygons( cm_model_t *model, idSurface_Patch &mesh, const idMaterial *material, int primitiveNum );
+	void			CreateTerrainPolygons( cm_model_t *model, const idTerrainPatch &terrain, const idMaterial *material, int primitiveNum );
+	bool			LoadTerrainForMap( const idMapFile *mapFile, idTerrainModel &terrainModel );
+	int				AddTerrainToModel( cm_model_t *model, idTerrainModel &terrainModel );
 	void			ConvertPatch( cm_model_t *model, const idMapPatch *patch, int primitiveNum );
 	void			ConvertBrushSides( cm_model_t *model, const idMapBrush *mapBrush, int primitiveNum );
 	void			ConvertBrush( cm_model_t *model, const idMapBrush *mapBrush, int primitiveNum );
@@ -466,9 +472,9 @@ private:			// CollisionMap_load.cpp
 	void			RemapEdges( cm_node_t *node, int *edgeRemap );
 	void			OptimizeArrays( cm_model_t *model );
 	void			FinishModel( cm_model_t *model );
-	void			BuildModels( const idMapFile *mapFile );
+	void			BuildModels( const idMapFile *mapFile, bool bakeTerrain );
 	cmHandle_t		FindModel( const char *name );
-	cm_model_t *	CollisionModelForMapEntity( const idMapEntity *mapEnt );	// brush/patch model from .map
+	cm_model_t *	CollisionModelForMapEntity( const idMapEntity *mapEnt, const idMapFile *mapFile = NULL, bool bakeTerrain = false );	// brush/patch model from .map
 	cm_model_t *	LoadRenderModel( const char *fileName );					// ASE/LWO models
 	bool			TrmFromModel_r( idTraceModel &trm, cm_node_t *node );
 	bool			TrmFromModel( const cm_model_t *model, idTraceModel &trm );
diff --git a/neo/engine/doomdll.vcxproj b/neo/engine/doomdll.vcxproj
index e941d0fb..05466f4c 100644
--- a/neo/engine/doomdll.vcxproj
+++ b/neo/engine/doomdll.vcxproj
@@ -402,6 +402,7 @@
     <ClInclude Include="models\ModelDecal.h" />
     <ClInclude Include="models\ModelManager.h" />
     <ClInclude Include="models\ModelOverlay.h" />
+    <ClInclude Include="models\TerrainModel.h" />
     <ClInclude Include="renderer\RenderSystem.h" />
     <ClInclude Include="renderer\RenderWorld.h" />
     <ClInclude Include="renderer\RenderWorld_local.h" />
@@ -1326,6 +1327,11 @@
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Dedicated Debug|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Dedicated Release|x64'">true</ExcludedFromBuild>
     </CustomBuildStep>
+    <CustomBuildStep Include="tools\radiant\Terrain.h">
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Dedicated Debug with inlines|x64'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Dedicated Debug|x64'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Dedicated Release|x64'">true</ExcludedFromBuild>
+    </CustomBuildStep>
     <CustomBuildStep Include="tools\radiant\Textures.h">
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Dedicated Debug with inlines|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Dedicated Debug|x64'">true</ExcludedFromBuild>
@@ -1584,6 +1590,7 @@
     <ClCompile Include="renderer\DeviceContext.cpp" />
     <ClCompile Include="renderer\draw_common.cpp" />
     <ClCompile Include="renderer\draw_dx.cpp" />
+    <ClCompile Include="renderer\draw_terrain.cpp" />
     <ClCompile Include="renderer\GuiModel.cpp" />
     <ClCompile Include="renderer\Image_files.cpp" />
     <ClCompile Include="renderer\Image_init.cpp" />
@@ -1604,6 +1611,7 @@
     <ClCompile Include="models\ModelDecal.cpp" />
     <ClCompile Include="models\ModelManager.cpp" />
     <ClCompile Include="models\ModelOverlay.cpp" />
+    <ClCompile Include="models\TerrainModel.cpp" />
     <ClCompile Include="renderer\RenderEntity.cpp" />
     <ClCompile Include="renderer\RenderSystem.cpp" />
     <ClCompile Include="renderer\RenderSystem_init.cpp" />
@@ -1611,6 +1619,7 @@
     <ClCompile Include="renderer\RenderWorld_demo.cpp" />
     <ClCompile Include="renderer\RenderWorld_load.cpp" />
     <ClCompile Include="renderer\RenderWorld_portals.cpp" />
+    <ClCompile Include="renderer\RenderWorld_terrain.cpp" />
     <ClCompile Include="renderer\tr_backend.cpp" />
     <ClCompile Include="renderer\tr_deform.cpp" />
     <ClCompile Include="renderer\tr_font.cpp" />
@@ -2884,6 +2893,11 @@
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Dedicated Debug|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Dedicated Release|x64'">true</ExcludedFromBuild>
     </ClCompile>
+    <ClCompile Include="tools\radiant\Terrain.cpp">
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Dedicated Debug with inlines|x64'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Dedicated Debug|x64'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Dedicated Release|x64'">true</ExcludedFromBuild>
+    </ClCompile>
     <ClCompile Include="tools\radiant\Undo.cpp">
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Dedicated Debug with inlines|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Dedicated Debug|x64'">true</ExcludedFromBuild>
diff --git a/neo/engine/doomdll.vcxproj.filters b/neo/engine/doomdll.vcxproj.filters
index 679bd778..1d1be098 100644
--- a/neo/engine/doomdll.vcxproj.filters
+++ b/neo/engine/doomdll.vcxproj.filters
@@ -606,6 +606,9 @@
     <ClInclude Include="models\ModelOverlay.h">
       <Filter>Models</Filter>
     </ClInclude>
+    <ClInclude Include="models\TerrainModel.h">
+      <Filter>Models</Filter>
+    </ClInclude>
     <ClInclude Include="renderer\stb_image.h">
       <Filter>Renderer</Filter>
     </ClInclude>
@@ -755,6 +758,9 @@
     <ClCompile Include="renderer\draw_common.cpp">
       <Filter>Renderer</Filter>
     </ClCompile>
+    <ClCompile Include="renderer\draw_terrain.cpp">
+      <Filter>Renderer</Filter>
+    </ClCompile>
     <ClCompile Include="renderer\GuiModel.cpp">
       <Filter>Renderer</Filter>
     </ClCompile>
@@ -1550,6 +1556,9 @@
     <ClCompile Include="tools\radiant\TextureBar.cpp">
       <Filter>Tools\Radiant</Filter>
     </ClCompile>
+    <ClCompile Include="tools\radiant\Terrain.cpp">
+      <Filter>Tools\Radiant</Filter>
+    </ClCompile>
     <ClCompile Include="tools\radiant\Undo.cpp">
       <Filter>Tools\Radiant</Filter>
     </ClCompile>
@@ -1640,6 +1649,9 @@
     <ClCompile Include="renderer\draw_dx.cpp">
       <Filter>Renderer</Filter>
     </ClCompile>
+    <ClCompile Include="renderer\RenderWorld_terrain.cpp">
+      <Filter>Renderer</Filter>
+    </ClCompile>
     <ClCompile Include="tools\radiant\OutlinerDlg.cpp">
       <Filter>Tools\Radiant</Filter>
     </ClCompile>
@@ -1682,6 +1694,9 @@
     <ClCompile Include="models\ModelOverlay.cpp">
       <Filter>Models</Filter>
     </ClCompile>
+    <ClCompile Include="models\TerrainModel.cpp">
+      <Filter>Models</Filter>
+    </ClCompile>
     <ClCompile Include="..\Prey\CM\CollisionModel_contacts.cpp">
       <Filter>CM\PreyCM</Filter>
     </ClCompile>
@@ -2510,6 +2525,9 @@
     <CustomBuildStep Include="tools\radiant\TextureBar.h">
       <Filter>Tools\Radiant</Filter>
     </CustomBuildStep>
+    <CustomBuildStep Include="tools\radiant\Terrain.h">
+      <Filter>Tools\Radiant</Filter>
+    </CustomBuildStep>
     <CustomBuildStep Include="tools\radiant\Textures.h">
       <Filter>Tools\Radiant</Filter>
     </CustomBuildStep>
diff --git a/neo/engine/idlib/TextCompiler.cpp b/neo/engine/idlib/TextCompiler.cpp
new file mode 100644
index 00000000..f8934c63
--- /dev/null
+++ b/neo/engine/idlib/TextCompiler.cpp
@@ -0,0 +1,2 @@
+#include "precompiled.h"
+#pragma hdrstop
diff --git a/neo/engine/idlib/TextCompiler.h b/neo/engine/idlib/TextCompiler.h
new file mode 100644
index 00000000..1af305ce
--- /dev/null
+++ b/neo/engine/idlib/TextCompiler.h
@@ -0,0 +1,140 @@
+#ifndef __TEXTCOMPILER_H__
+#define __TEXTCOMPILER_H__
+
+#include "../framework/File.h"
+
+namespace TextCompiler
+{
+	// Write an indirect value
+	template <typename type> inline void WriteValue(type const * const ptr, idFile *out, bool byteSwap=false) 
+	{ 
+		if(out != NULL)
+		{
+			if(!byteSwap)
+			{
+				out->Write(ptr, sizeof(type));
+			}
+			else
+			{
+				byte const * const p = (byte *)ptr;
+
+				for(int i=sizeof(type)-1;i>=0;i--)
+				{
+					out->Write(&(p[i]), 1);
+				}
+			}
+
+		}
+	}
+
+	// Write a direct value
+	template <typename type> inline void WriteValue(type const val, idFile *out, bool byteSwap=false) 
+	{ 
+		if(out != NULL)
+		{
+			if(!byteSwap)
+			{
+				out->Write(&val, sizeof(type));
+			}
+			else
+			{
+				byte const * const p = (byte *)&val;
+
+				for(int i=sizeof(type)-1;i>=0;i--)
+				{
+					out->Write(&(p[i]), 1);
+				}
+			}
+ 		}
+	}
+
+	template <typename type> inline type ReadValue(idFile *in) 
+	{ 
+		type ret; 
+		
+		in->Read(&ret, sizeof(type));
+		return ret;
+	}
+
+	// specialization write for idStr's
+	template <> inline void WriteValue(idStr const * const ptr, idFile *out, bool byteSwap) 
+	{ 
+		if(out != NULL)
+		{
+			// if less than 32, then we don't need a trailing null
+			// this is because 5 bits can be used to represent string length in the token header
+			// zero length strings end up needing to be null terminated
+			if((ptr->Length() < 32) && (ptr->Length() != 0))
+			{
+				out->Write(ptr->c_str(), ptr->Length());
+			}
+			else
+			{
+				out->Write(ptr->c_str(), ptr->Length()+1);
+			}
+		}
+	}
+
+	// specialization read for idStr's
+	template <> inline idStr ReadValue(idFile *in) 
+	{ 
+		char c;
+		idStr str;
+
+		in->Read(&c, 1);
+		while(c != '\0')
+		{
+			str.Append(c);
+			in->Read(&c, 1);
+		}
+
+		str.Append(c);
+
+		return str;
+	}
+
+	template <typename type> inline void WriteArray(type const * const ptr, unsigned int count, idFile *out)
+	{
+		WriteValue<unsigned int>(&count, out);
+		for(unsigned int i=0;i<count; i++)
+		{
+			WriteValue<type>(&(ptr[i]), out);
+		}
+	}
+
+	template <typename type> inline type *ReadArray(idFile *in, unsigned int *count=NULL) 
+	{ 
+		unsigned int len; 
+		len = ReadValue<unsigned int>(in);
+		type *buffer = (type *)malloc(len*sizeof(type)); 
+		type *ptr = buffer;
+		for(unsigned int i=0;i<len;i++)
+		{
+			*ptr = ReadValue<type>(in);
+			ptr++;
+		}
+		if(count != NULL)
+			*count = len;
+		return buffer;
+	}
+
+	template <typename type> inline void WriteIdList(idList<type> const * const ptr, idFile *out)
+	{
+		WriteArray<type>(ptr->Ptr(), ptr->Num(), out);
+	}
+
+	template <typename type> inline idList<type> ReadIdList(idFile *in)
+	{
+		idList<type> ret;
+		ret.Clear();
+		unsigned int count;
+		idAutoPtr<type> array(ReadArray<type>(in, &count));
+
+		for(unsigned int i=0;i<count;i++)
+			ret.Append(array[i]);
+
+		return ret;
+	}
+};
+
+#endif
diff --git a/neo/engine/idlib/math/Radians.cpp b/neo/engine/idlib/math/Radians.cpp
new file mode 100644
index 00000000..4c51a49e
--- /dev/null
+++ b/neo/engine/idlib/math/Radians.cpp
@@ -0,0 +1,135 @@
+#include "../precompiled.h"
+#pragma hdrstop
+
+#include <float.h>
+
+/*
+=================
+rvAngles::NormalizeFull
+
+returns angles normalized to the range [0 <= angle < TWO_PI]
+=================
+*/
+rvAngles &rvAngles::NormalizeFull( void ) 
+{
+	// Get to -TWO_PI < a < TWO_PI
+	pitch = fmodf( pitch, idMath::TWO_PI );
+	yaw = fmodf( yaw, idMath::TWO_PI );
+	roll = fmodf( roll, idMath::TWO_PI );
+
+	// Fix any negatives
+	if( pitch < 0.0f )
+	{
+		pitch += idMath::TWO_PI;
+	}
+
+	if( yaw < 0.0f )
+	{
+		yaw += idMath::TWO_PI;
+	}
+
+	if( roll < 0.0f )
+	{
+		roll += idMath::TWO_PI;
+	}
+
+	return( *this );
+}
+
+/*
+=================
+rvAngles::NormalizeHalf
+
+returns angles normalized to the range [-PI < angle <= PI]
+=================
+*/
+rvAngles &rvAngles::NormalizeHalf( void ) 
+{
+	int		i;
+
+	// Get to -TWO_PI < a < TWO_PI
+	pitch = fmodf( pitch, idMath::TWO_PI );
+	yaw = fmodf( yaw, idMath::TWO_PI );
+	roll = fmodf( roll, idMath::TWO_PI );
+
+	for( i = 0; i < 3; i++ )
+	{
+		if( ( *this )[i] < -idMath::PI )
+		{
+			( *this )[i] += idMath::TWO_PI;
+		}
+
+		if( ( *this )[i] > idMath::PI )
+		{
+			( *this )[i] -= idMath::TWO_PI;
+		}
+	}
+
+	return( *this );
+}
+
+/*
+=================
+rvAngles::ToVectors
+=================
+*/
+void rvAngles::ToVectors( idVec3 *forward, idVec3 *right, idVec3 *up ) const 
+{
+	float	sr, sp, sy, cr, cp, cy;
+	
+	idMath::SinCos( yaw, sy, cy );
+	idMath::SinCos( pitch, sp, cp );
+	idMath::SinCos( roll, sr, cr );
+
+	if( forward ) 
+	{
+		forward->Set( cp * cy, cp * sy, -sp );
+	}
+
+	if( right ) 
+	{
+		right->Set( -sr * sp * cy + cr * sy, -sr * sp * sy + -cr * cy, -sr * cp );
+	}
+
+	if( up ) 
+	{
+		up->Set( cr * sp * cy + -sr * -sy, cr * sp * sy + -sr * cy, cr * cp );
+	}
+}
+
+/*
+=================
+rvAngles::ToForward
+=================
+*/
+idVec3 rvAngles::ToForward( void ) const 
+{
+	float	sp, sy, cp, cy;
+	
+	idMath::SinCos( yaw, sy, cy );
+	idMath::SinCos( pitch, sp, cp );
+
+	return( idVec3( cp * cy, cp * sy, -sp ) );
+}
+
+/*
+=================
+rvAngles::ToMat3
+=================
+*/
+idMat3 &rvAngles::ToMat3( idMat3 &mat ) const 
+{
+	float	sr, sp, sy, cr, cp, cy;
+		
+	idMath::SinCos( yaw, sy, cy );
+	idMath::SinCos( pitch, sp, cp );
+	idMath::SinCos( roll, sr, cr );
+
+	mat[0].Set( cp * cy, cp * sy, -sp );
+	mat[1].Set( sr * sp * cy + cr * -sy, sr * sp * sy + cr * cy, sr * cp );
+	mat[2].Set( cr * sp * cy + -sr * -sy, cr * sp * sy + -sr * cy, cr * cp );
+
+	return( mat );
+}
+
+// end
diff --git a/neo/engine/idlib/math/Radians.h b/neo/engine/idlib/math/Radians.h
new file mode 100644
index 00000000..2e260350
--- /dev/null
+++ b/neo/engine/idlib/math/Radians.h
@@ -0,0 +1,252 @@
+#ifndef _MATH_RADIANS_H_INC_
+#define _MATH_RADIANS_H_INC_
+
+/*
+===============================================================================
+	Euler angles
+
+	This is basically a duplicate of idAngles, but used radians rather than 
+	degrees (to avoid the conversion before trig calls)
+
+	All trig calls use float precision
+
+	ToMat3 passes in workspace to avoid a memcpy
+
+===============================================================================
+*/
+
+#ifndef M_PI
+#  define M_PI (3.1415926536f)
+#endif
+
+class idVec3;
+class idMat3;
+
+class rvAngles 
+{
+public:
+	float			pitch;
+	float			yaw;
+	float			roll;
+
+					rvAngles( void ) {}
+					rvAngles( float pitch, float yaw, float roll );
+	explicit		rvAngles( const idVec3 &v );
+
+	void 			Set( float pitch, float yaw, float roll );
+	rvAngles &		Zero( void );
+
+	float			operator[]( int index ) const;
+	float &			operator[]( int index );
+	rvAngles		operator-() const;
+	rvAngles &		operator=( const rvAngles &a );
+	rvAngles &		operator=( const idVec3 &a );
+	rvAngles		operator+( const rvAngles &a ) const;
+	rvAngles		operator+( const idVec3 &a ) const;
+	rvAngles &		operator+=( const rvAngles &a );
+	rvAngles &		operator+=( const idVec3 &a );
+	rvAngles		operator-( const rvAngles &a ) const;
+	rvAngles		operator-( const idVec3 &a ) const;
+	rvAngles &		operator-=( const rvAngles &a );
+	rvAngles &		operator-=( const idVec3 &a );
+	rvAngles		operator*( const float a ) const;
+	rvAngles &		operator*=( const float a );
+
+	friend rvAngles	operator+( const idVec3 &a, const rvAngles &b );
+	friend rvAngles	operator-( const idVec3 &a, const rvAngles &b );
+	friend rvAngles	operator*( const float a, const rvAngles &b );
+
+	bool			Compare( const rvAngles &a ) const;							// exact compare, no epsilon
+	bool			Compare( const rvAngles &a, const float epsilon ) const;	// compare with epsilon
+	bool			operator==(	const rvAngles &a ) const;						// exact compare, no epsilon
+	bool			operator!=(	const rvAngles &a ) const;						// exact compare, no epsilon
+
+	rvAngles &		NormalizeFull( void );	// normalizes 'this'
+	rvAngles &		NormalizeHalf( void );	// normalizes 'this'
+
+	void			ToVectors( idVec3 *forward, idVec3 *right = NULL, idVec3 *up = NULL ) const;
+	idVec3			ToForward( void ) const;
+	idMat3			&ToMat3( idMat3 &mat ) const;
+
+	const float *	ToFloatPtr( void ) const { return( &pitch ); }
+	float *			ToFloatPtr( void ) { return( &pitch ); }
+};
+
+ID_INLINE rvAngles::rvAngles( float pitch, float yaw, float roll ) 
+{
+	this->pitch = pitch;
+	this->yaw	= yaw;
+	this->roll	= roll;
+}
+
+ID_INLINE rvAngles::rvAngles( const idVec3 &v ) 
+{
+	this->pitch = v[0];
+	this->yaw	= v[1];
+	this->roll	= v[2];
+}
+
+ID_INLINE void rvAngles::Set( float pitch, float yaw, float roll ) 
+{
+	this->pitch = pitch;
+	this->yaw	= yaw;
+	this->roll	= roll;
+}
+
+ID_INLINE rvAngles &rvAngles::Zero( void ) 
+{
+	pitch = 0.0f;
+	yaw = 0.0f;
+	roll = 0.0f;
+	return( *this );
+}
+
+ID_INLINE float rvAngles::operator[]( int index ) const 
+{
+	assert( ( index >= 0 ) && ( index < 3 ) );
+	return( ( &pitch )[ index ] );
+}
+
+ID_INLINE float &rvAngles::operator[]( int index ) 
+{
+	assert( ( index >= 0 ) && ( index < 3 ) );
+	return( ( &pitch )[ index ] );
+}
+
+ID_INLINE rvAngles rvAngles::operator-( void ) const 
+{
+	return( rvAngles( -pitch, -yaw, -roll ) );
+}
+
+ID_INLINE rvAngles &rvAngles::operator=( const rvAngles &a ) 
+{
+	pitch = a.pitch;
+	yaw = a.yaw;
+	roll = a.roll;
+	return( *this );
+}
+
+ID_INLINE rvAngles &rvAngles::operator=( const idVec3 &a ) 
+{
+	pitch = a.x;
+	yaw = a.y;
+	roll = a.z;
+	return( *this );
+}
+
+ID_INLINE rvAngles rvAngles::operator+( const rvAngles &a ) const 
+{
+	return( rvAngles( pitch + a.pitch, yaw + a.yaw, roll + a.roll ) );
+}
+
+ID_INLINE rvAngles rvAngles::operator+( const idVec3 &a ) const 
+{
+	return( rvAngles( pitch + a.x, yaw + a.y, roll + a.z ) );
+}
+
+ID_INLINE rvAngles& rvAngles::operator+=( const rvAngles &a ) 
+{
+	pitch += a.pitch;
+	yaw += a.yaw;
+	roll += a.roll;
+	return( *this );
+}
+
+ID_INLINE rvAngles& rvAngles::operator+=( const idVec3 &a ) 
+{
+	pitch += a.x;
+	yaw += a.y;
+	roll += a.z;
+	return( *this );
+}
+
+ID_INLINE rvAngles rvAngles::operator-( const rvAngles &a ) const 
+{
+	return( rvAngles( pitch - a.pitch, yaw - a.yaw, roll - a.roll ) );
+}
+
+ID_INLINE rvAngles rvAngles::operator-( const idVec3 &a ) const 
+{
+	return( rvAngles( pitch - a.x, yaw - a.y, roll - a.z ) );
+}
+
+ID_INLINE rvAngles& rvAngles::operator-=( const rvAngles &a ) 
+{
+	pitch -= a.pitch;
+	yaw -= a.yaw;
+	roll -= a.roll;
+	return( *this );
+}
+
+ID_INLINE rvAngles& rvAngles::operator-=( const idVec3 &a ) 
+{
+	pitch -= a.x;
+	yaw -= a.y;
+	roll -= a.z;
+	return( *this );
+}
+
+ID_INLINE rvAngles rvAngles::operator*( const float a ) const 
+{
+	return( rvAngles( pitch * a, yaw * a, roll * a ) );
+}
+
+ID_INLINE rvAngles& rvAngles::operator*=( float a ) 
+{
+	pitch *= a;
+	yaw *= a;
+	roll *= a;
+	return( *this );
+}
+
+ID_INLINE rvAngles operator+( const idVec3 &a, const rvAngles &b ) 
+{
+	return( rvAngles( a.x + b.pitch, a.y + b.yaw, a.z + b.roll ) );
+}
+
+ID_INLINE rvAngles operator-( const idVec3 &a, const rvAngles &b ) 
+{
+	return( rvAngles( a.x - b.pitch, a.y - b.yaw, a.z - b.roll ) ); 
+}
+
+ID_INLINE rvAngles operator*( const float a, const rvAngles &b ) 
+{
+	return( rvAngles( a * b.pitch, a * b.yaw, a * b.roll ) );
+}
+
+ID_INLINE bool rvAngles::Compare( const rvAngles &a ) const 
+{
+	return( ( a.pitch == pitch ) && ( a.yaw == yaw ) && ( a.roll == roll ) );
+}
+
+ID_INLINE bool rvAngles::Compare( const rvAngles &a, const float epsilon ) const 
+{
+	if( idMath::Fabs( pitch - a.pitch ) > epsilon ) 
+	{
+		return( false );
+	}
+			
+	if( idMath::Fabs( yaw - a.yaw ) > epsilon ) 
+	{
+		return( false );
+	}
+
+	if( idMath::Fabs( roll - a.roll ) > epsilon ) 
+	{
+		return( false );
+	}
+
+	return( true );
+}
+
+ID_INLINE bool rvAngles::operator==( const rvAngles &a ) const 
+{
+	return( Compare( a ) );
+}
+
+ID_INLINE bool rvAngles::operator!=( const rvAngles &a ) const 
+{
+	return( !Compare( a ) );
+}
+
+#endif // _MATH_RADIANS_H_INC_
diff --git a/neo/engine/models/TerrainModel.cpp b/neo/engine/models/TerrainModel.cpp
new file mode 100644
index 00000000..b5d5abd4
--- /dev/null
+++ b/neo/engine/models/TerrainModel.cpp
@@ -0,0 +1,578 @@
+/*
+===========================================================================
+
+Shared terrain source model
+
+===========================================================================
+*/
+
+#include "precompiled.h"
+#pragma hdrstop
+
+#include "TerrainModel.h"
+
+idTerrainPatch::idTerrainPatch() {
+	name.Clear();
+	material.Clear();
+	origin.Zero();
+	width = TERRAIN_DEFAULT_VERTS;
+	height = TERRAIN_DEFAULT_VERTS;
+	cellSize = TERRAIN_DEFAULT_CELL_SIZE;
+	paintWidth = TERRAIN_DEFAULT_PAINT_SIZE;
+	paintHeight = TERRAIN_DEFAULT_PAINT_SIZE;
+	paintTexture = 0;
+	paintTextureDirty = true;
+	paintDirtyMinX = 0;
+	paintDirtyMinY = 0;
+	paintDirtyMaxX = paintWidth - 1;
+	paintDirtyMaxY = paintHeight - 1;
+	bounds.Clear();
+}
+
+int idTerrainPatch::SampleIndex( int x, int y ) const {
+	return y * width + x;
+}
+
+int idTerrainPatch::PaintIndex( int x, int y ) const {
+	return y * paintWidth + x;
+}
+
+float idTerrainPatch::SampleHeight( int x, int y ) const {
+	return heights[SampleIndex( x, y )];
+}
+
+void idTerrainPatch::SetHeight( int x, int y, float height ) {
+	heights[SampleIndex( x, y )] = height;
+}
+
+bool idTerrainPatch::SetHeightBySample( int sample, float height ) {
+	if ( sample < 0 || sample >= heights.Num() ) {
+		return false;
+	}
+	heights[sample] = height;
+	return true;
+}
+
+idVec4 idTerrainPatch::SamplePaintWeight( int x, int y ) const {
+	return paintWeights[PaintIndex( x, y )];
+}
+
+void idTerrainPatch::SetPaintWeight( int x, int y, const idVec4 &weight ) {
+	paintWeights[PaintIndex( x, y )] = NormalizeLayerWeight( weight );
+	MarkPaintTextureDirtyRect( x, y, x, y );
+}
+
+bool idTerrainPatch::SetPaintWeightBySample( int sample, const idVec4 &weight ) {
+	if ( sample < 0 || sample >= paintWeights.Num() || paintWidth <= 0 ) {
+		return false;
+	}
+	paintWeights[sample] = NormalizeLayerWeight( weight );
+	MarkPaintTextureDirtyRect( sample % paintWidth, sample / paintWidth, sample % paintWidth, sample / paintWidth );
+	return true;
+}
+
+idVec4 idTerrainPatch::BaseLayerWeight() {
+	return idVec4( 1.0f, 0.0f, 0.0f, 0.0f );
+}
+
+idVec4 idTerrainPatch::NormalizeLayerWeight( const idVec4 &weight ) {
+	idVec4 normalized;
+	normalized.x = weight.x > 0.0f ? weight.x : 0.0f;
+	normalized.y = weight.y > 0.0f ? weight.y : 0.0f;
+	normalized.z = weight.z > 0.0f ? weight.z : 0.0f;
+	normalized.w = weight.w > 0.0f ? weight.w : 0.0f;
+
+	const float total = normalized.x + normalized.y + normalized.z + normalized.w;
+	if ( total <= 0.0001f ) {
+		return BaseLayerWeight();
+	}
+
+	const float invTotal = 1.0f / total;
+	normalized.x *= invTotal;
+	normalized.y *= invTotal;
+	normalized.z *= invTotal;
+	normalized.w *= invTotal;
+	return normalized;
+}
+
+float idTerrainPatch::WorldWidth() const {
+	return ( width - 1 ) * cellSize;
+}
+
+float idTerrainPatch::WorldHeight() const {
+	return ( height - 1 ) * cellSize;
+}
+
+float idTerrainPatch::BilinearHeight( float u, float v ) const {
+	u = idMath::ClampFloat( 0.0f, 1.0f, u );
+	v = idMath::ClampFloat( 0.0f, 1.0f, v );
+
+	const float fx = u * ( width - 1 );
+	const float fy = v * ( height - 1 );
+	const int x0 = idMath::ClampInt( 0, width - 1, (int)floorf( fx ) );
+	const int y0 = idMath::ClampInt( 0, height - 1, (int)floorf( fy ) );
+	const int x1 = idMath::ClampInt( 0, width - 1, x0 + 1 );
+	const int y1 = idMath::ClampInt( 0, height - 1, y0 + 1 );
+	const float tx = fx - (float)x0;
+	const float ty = fy - (float)y0;
+
+	const float h00 = SampleHeight( x0, y0 );
+	const float h10 = SampleHeight( x1, y0 );
+	const float h01 = SampleHeight( x0, y1 );
+	const float h11 = SampleHeight( x1, y1 );
+	const float h0 = h00 + ( h10 - h00 ) * tx;
+	const float h1 = h01 + ( h11 - h01 ) * tx;
+	return h0 + ( h1 - h0 ) * ty;
+}
+
+idVec3 idTerrainPatch::VertexUV( float u, float v ) const {
+	idVec3 p;
+	p.x = origin.x + WorldWidth() * u;
+	p.y = origin.y + WorldHeight() * v;
+	p.z = origin.z + BilinearHeight( u, v );
+	return p;
+}
+
+idVec3 idTerrainPatch::Vertex( int x, int y ) const {
+	idVec3 v;
+	v.x = origin.x + x * cellSize;
+	v.y = origin.y + y * cellSize;
+	v.z = origin.z + SampleHeight( x, y );
+	return v;
+}
+
+idVec3 idTerrainPatch::VertexNormal( int x, int y ) const {
+	const int x0 = idMath::ClampInt( 0, width - 1, x - 1 );
+	const int x1 = idMath::ClampInt( 0, width - 1, x + 1 );
+	const int y0 = idMath::ClampInt( 0, height - 1, y - 1 );
+	const int y1 = idMath::ClampInt( 0, height - 1, y + 1 );
+	const idVec3 sx = Vertex( x1, y ) - Vertex( x0, y );
+	const idVec3 sy = Vertex( x, y1 ) - Vertex( x, y0 );
+	idVec3 normal = sx.Cross( sy );
+	if ( normal.LengthSqr() <= 0.0001f ) {
+		normal.Set( 0.0f, 0.0f, 1.0f );
+	} else {
+		normal.Normalize();
+	}
+	return normal;
+}
+
+void idTerrainPatch::UpdateBounds() {
+	bounds.Clear();
+	if ( width <= 0 || height <= 0 ) {
+		bounds.AddPoint( origin );
+		return;
+	}
+	for ( int y = 0; y < height; y++ ) {
+		for ( int x = 0; x < width; x++ ) {
+			bounds.AddPoint( Vertex( x, y ) );
+		}
+	}
+}
+
+void idTerrainPatch::EnsureLayerData( const char *defaultMaterial ) {
+	if ( material.IsEmpty() ) {
+		material = defaultMaterial && defaultMaterial[0] ? defaultMaterial : "textures/common/caulk";
+	}
+	if ( layerMaterials[0].IsEmpty() ) {
+		layerMaterials[0] = material;
+	}
+	material = layerMaterials[0];
+
+	if ( width < 2 ) {
+		width = 2;
+	}
+	if ( height < 2 ) {
+		height = 2;
+	}
+	const int heightSampleCount = width * height;
+	const int oldHeightCount = heights.Num();
+	heights.SetNum( heightSampleCount );
+	for ( int i = oldHeightCount; i < heightSampleCount; i++ ) {
+		heights[i] = 0.0f;
+	}
+
+	if ( paintWidth < 2 ) {
+		paintWidth = TERRAIN_DEFAULT_PAINT_SIZE;
+	}
+	if ( paintHeight < 2 ) {
+		paintHeight = TERRAIN_DEFAULT_PAINT_SIZE;
+	}
+
+	const int paintSampleCount = paintWidth * paintHeight;
+	if ( paintSampleCount <= 0 ) {
+		paintWeights.Clear();
+		return;
+	}
+
+	const int oldCount = paintWeights.Num();
+	paintWeights.SetNum( paintSampleCount );
+	if ( oldCount != paintSampleCount ) {
+		MarkPaintTextureDirty();
+	}
+	for ( int i = 0; i < paintSampleCount; i++ ) {
+		if ( i >= oldCount ) {
+			paintWeights[i] = BaseLayerWeight();
+		} else {
+			paintWeights[i] = NormalizeLayerWeight( paintWeights[i] );
+		}
+	}
+	UpdateBounds();
+}
+
+void idTerrainPatch::ClearLayerWeight( int layer ) {
+	if ( layer < 0 || layer >= TERRAIN_MAX_LAYERS ) {
+		return;
+	}
+	for ( int i = 0; i < paintWeights.Num(); i++ ) {
+		idVec4 weight = paintWeights[i];
+		weight[layer] = 0.0f;
+		paintWeights[i] = NormalizeLayerWeight( weight );
+	}
+	MarkPaintTextureDirty();
+}
+
+bool idTerrainPatch::SetLayerMaterials( const idStr newLayerMaterials[TERRAIN_MAX_LAYERS], const char *defaultMaterial ) {
+	bool changed = false;
+	for ( int layer = 0; layer < TERRAIN_MAX_LAYERS; layer++ ) {
+		idStr materialName = newLayerMaterials[layer];
+		materialName.StripLeading( ' ' );
+		materialName.StripTrailing( ' ' );
+		if ( layer == 0 && materialName.IsEmpty() ) {
+			materialName = defaultMaterial && defaultMaterial[0] ? defaultMaterial : "textures/common/caulk";
+		}
+		if ( layerMaterials[layer].Icmp( materialName.c_str() ) == 0 ) {
+			continue;
+		}
+		layerMaterials[layer] = materialName;
+		if ( layer > 0 && materialName.IsEmpty() ) {
+			ClearLayerWeight( layer );
+		}
+		changed = true;
+	}
+	material = layerMaterials[0];
+	return changed;
+}
+
+void idTerrainPatch::MarkPaintTextureDirty() {
+	paintTextureDirty = true;
+	paintDirtyMinX = 0;
+	paintDirtyMinY = 0;
+	paintDirtyMaxX = paintWidth > 0 ? paintWidth - 1 : 0;
+	paintDirtyMaxY = paintHeight > 0 ? paintHeight - 1 : 0;
+}
+
+void idTerrainPatch::ClearPaintTextureDirtyRect() {
+	paintTextureDirty = false;
+	paintDirtyMinX = paintWidth;
+	paintDirtyMinY = paintHeight;
+	paintDirtyMaxX = -1;
+	paintDirtyMaxY = -1;
+}
+
+void idTerrainPatch::MarkPaintTextureDirtyRect( int minX, int minY, int maxX, int maxY ) {
+	if ( paintWidth <= 0 || paintHeight <= 0 ) {
+		return;
+	}
+
+	minX = idMath::ClampInt( 0, paintWidth - 1, minX );
+	maxX = idMath::ClampInt( 0, paintWidth - 1, maxX );
+	minY = idMath::ClampInt( 0, paintHeight - 1, minY );
+	maxY = idMath::ClampInt( 0, paintHeight - 1, maxY );
+	if ( maxX < minX || maxY < minY ) {
+		return;
+	}
+
+	if ( !paintTextureDirty || paintDirtyMaxX < paintDirtyMinX || paintDirtyMaxY < paintDirtyMinY ) {
+		paintDirtyMinX = minX;
+		paintDirtyMinY = minY;
+		paintDirtyMaxX = maxX;
+		paintDirtyMaxY = maxY;
+	} else {
+		if ( minX < paintDirtyMinX ) {
+			paintDirtyMinX = minX;
+		}
+		if ( minY < paintDirtyMinY ) {
+			paintDirtyMinY = minY;
+		}
+		if ( maxX > paintDirtyMaxX ) {
+			paintDirtyMaxX = maxX;
+		}
+		if ( maxY > paintDirtyMaxY ) {
+			paintDirtyMaxY = maxY;
+		}
+	}
+	paintTextureDirty = true;
+}
+
+idTerrainModel::idTerrainModel() {
+}
+
+idTerrainModel::~idTerrainModel() {
+	Clear();
+}
+
+void idTerrainModel::Clear() {
+	terrains.DeleteContents( true );
+}
+
+int idTerrainModel::NumTerrains() const {
+	return terrains.Num();
+}
+
+idTerrainPatch *idTerrainModel::Terrain( int index ) {
+	if ( index < 0 || index >= terrains.Num() ) {
+		return NULL;
+	}
+	return terrains[index];
+}
+
+const idTerrainPatch *idTerrainModel::Terrain( int index ) const {
+	if ( index < 0 || index >= terrains.Num() ) {
+		return NULL;
+	}
+	return terrains[index];
+}
+
+idList<idTerrainPatch *> &idTerrainModel::Terrains() {
+	return terrains;
+}
+
+const idList<idTerrainPatch *> &idTerrainModel::Terrains() const {
+	return terrains;
+}
+
+static float TerrainModel_SnapToGrid( float value, float gridSize ) {
+	if ( gridSize <= 0.0f ) {
+		gridSize = 1.0f;
+	}
+	return floorf( value / gridSize + ( value >= 0.0f ? 0.5f : -0.5f ) ) * gridSize;
+}
+
+idTerrainPatch *idTerrainModel::AllocDefaultTerrain( const idVec3 &center, const char *defaultMaterial, float gridSize ) {
+	idTerrainPatch *terrain = new idTerrainPatch;
+	terrain->name = va( "terrain_%i", terrains.Num() + 1 );
+	terrain->material = defaultMaterial && defaultMaterial[0] ? defaultMaterial : "textures/common/caulk";
+	terrain->layerMaterials[0] = terrain->material;
+	const float worldSize = ( terrain->width - 1 ) * terrain->cellSize;
+	terrain->origin.x = TerrainModel_SnapToGrid( center.x - worldSize * 0.5f, gridSize );
+	terrain->origin.y = TerrainModel_SnapToGrid( center.y - worldSize * 0.5f, gridSize );
+	terrain->origin.z = TerrainModel_SnapToGrid( center.z, gridSize );
+	terrain->heights.SetNum( terrain->width * terrain->height );
+	for ( int i = 0; i < terrain->heights.Num(); i++ ) {
+		terrain->heights[i] = 0.0f;
+	}
+	terrain->EnsureLayerData( defaultMaterial );
+	return terrain;
+}
+
+void idTerrainModel::AddTerrain( idTerrainPatch *terrain ) {
+	if ( terrain ) {
+		terrains.Append( terrain );
+	}
+}
+
+idStr idTerrainModel::FileNameForMap( const char *mapFileName ) {
+	idStr fileName = mapFileName ? mapFileName : "";
+	fileName.StripFileExtension();
+	fileName.SetFileExtension( ".terrain" );
+	return fileName;
+}
+
+bool idTerrainModel::SaveFile( const char *filename ) {
+	if ( !filename || !filename[0] ) {
+		return false;
+	}
+
+	const bool osPath = strstr( filename, ":" ) != NULL;
+	idFile *file = osPath ? fileSystem->OpenExplicitFileWrite( filename ) : fileSystem->OpenFileWrite( filename );
+	if ( !file ) {
+		common->Warning( "idTerrainModel::SaveFile: couldn't write %s", filename );
+		return false;
+	}
+
+	file->WriteFloatString( "terrainAuthoring 3 {\n" );
+	for ( int i = 0; i < terrains.Num(); i++ ) {
+		idTerrainPatch *terrain = terrains[i];
+		if ( !terrain ) {
+			continue;
+		}
+		terrain->EnsureLayerData( "textures/common/caulk" );
+
+		file->WriteFloatString( "\tterrain {\n" );
+		file->WriteFloatString( "\t\tname \"%s\"\n", terrain->name.c_str() );
+		file->WriteFloatString( "\t\tmaterial \"%s\"\n", terrain->material.c_str() );
+		for ( int layer = 0; layer < TERRAIN_MAX_LAYERS; layer++ ) {
+			if ( layer == 0 || !terrain->layerMaterials[layer].IsEmpty() ) {
+				file->WriteFloatString( "\t\tlayer %i \"%s\"\n", layer, terrain->layerMaterials[layer].c_str() );
+			}
+		}
+		file->WriteFloatString( "\t\torigin ( %f %f %f )\n", terrain->origin.x, terrain->origin.y, terrain->origin.z );
+		file->WriteFloatString( "\t\tsize %i %i\n", terrain->width, terrain->height );
+		file->WriteFloatString( "\t\tcellSize %f\n", terrain->cellSize );
+		file->WriteFloatString( "\t\tpaintSize %i %i\n", terrain->paintWidth, terrain->paintHeight );
+		file->WriteFloatString( "\t\theights {\n" );
+		for ( int y = 0; y < terrain->height; y++ ) {
+			file->WriteFloatString( "\t\t\t" );
+			for ( int x = 0; x < terrain->width; x++ ) {
+				file->WriteFloatString( "%f ", terrain->SampleHeight( x, y ) );
+			}
+			file->WriteFloatString( "\n" );
+		}
+		file->WriteFloatString( "\t\t}\n" );
+		file->WriteFloatString( "\t\tpaintWeights {\n" );
+		for ( int y = 0; y < terrain->paintHeight; y++ ) {
+			file->WriteFloatString( "\t\t\t" );
+			for ( int x = 0; x < terrain->paintWidth; x++ ) {
+				const idVec4 weights = terrain->SamplePaintWeight( x, y );
+				file->WriteFloatString( "%f %f %f %f ", weights.x, weights.y, weights.z, weights.w );
+			}
+			file->WriteFloatString( "\n" );
+		}
+		file->WriteFloatString( "\t\t}\n" );
+		file->WriteFloatString( "\t}\n" );
+	}
+	file->WriteFloatString( "}\n" );
+	fileSystem->CloseFile( file );
+	return true;
+}
+
+bool idTerrainModel::LoadFile( const char *filename, const char *defaultMaterial ) {
+	Clear();
+	if ( !filename || !filename[0] ) {
+		return false;
+	}
+
+	const char *fallbackMaterial = defaultMaterial && defaultMaterial[0] ? defaultMaterial : "textures/common/caulk";
+	const bool osPath = strstr( filename, ":" ) != NULL;
+	idLexer src( LEXFL_NOSTRINGCONCAT | LEXFL_NODOLLARPRECOMPILE | LEXFL_ALLOWPATHNAMES );
+	src.LoadFile( filename, osPath );
+	if ( !src.IsLoaded() ) {
+		return false;
+	}
+
+	idToken token;
+	if ( !src.ReadToken( &token ) || token.Icmp( "terrainAuthoring" ) ) {
+		return false;
+	}
+	src.ReadToken( &token );
+	if ( token != "{" ) {
+		src.ExpectTokenString( "{" );
+	}
+
+	while ( src.ReadToken( &token ) ) {
+		if ( token == "}" ) {
+			break;
+		}
+		if ( token.Icmp( "terrain" ) ) {
+			break;
+		}
+
+		idTerrainPatch *terrain = new idTerrainPatch;
+		terrain->name = va( "terrain_%i", terrains.Num() + 1 );
+		terrain->material = fallbackMaterial;
+		terrain->layerMaterials[0] = terrain->material;
+		terrain->MarkPaintTextureDirty();
+
+		src.ExpectTokenString( "{" );
+		while ( src.ReadToken( &token ) ) {
+			if ( token == "}" ) {
+				break;
+			}
+			if ( !token.Icmp( "name" ) ) {
+				src.ExpectAnyToken( &token );
+				terrain->name = token;
+			} else if ( !token.Icmp( "material" ) ) {
+				src.ExpectAnyToken( &token );
+				terrain->material = token;
+				terrain->layerMaterials[0] = token;
+			} else if ( !token.Icmp( "layer" ) ) {
+				const int layer = src.ParseInt();
+				src.ExpectAnyToken( &token );
+				if ( layer >= 0 && layer < TERRAIN_MAX_LAYERS ) {
+					terrain->layerMaterials[layer] = token;
+					if ( layer == 0 ) {
+						terrain->material = token;
+					}
+				}
+			} else if ( !token.Icmp( "origin" ) ) {
+				src.Parse1DMatrix( 3, terrain->origin.ToFloatPtr() );
+			} else if ( !token.Icmp( "size" ) ) {
+				terrain->width = src.ParseInt();
+				terrain->height = src.ParseInt();
+				if ( terrain->width < 2 ) {
+					terrain->width = 2;
+				}
+				if ( terrain->height < 2 ) {
+					terrain->height = 2;
+				}
+			} else if ( !token.Icmp( "cellSize" ) ) {
+				terrain->cellSize = src.ParseFloat();
+				if ( terrain->cellSize <= 0.0f ) {
+					terrain->cellSize = TERRAIN_DEFAULT_CELL_SIZE;
+				}
+			} else if ( !token.Icmp( "paintSize" ) ) {
+				terrain->paintWidth = src.ParseInt();
+				terrain->paintHeight = src.ParseInt();
+				if ( terrain->paintWidth < 2 ) {
+					terrain->paintWidth = 2;
+				}
+				if ( terrain->paintHeight < 2 ) {
+					terrain->paintHeight = 2;
+				}
+			} else if ( !token.Icmp( "heights" ) ) {
+				src.ExpectTokenString( "{" );
+				terrain->heights.SetNum( terrain->width * terrain->height );
+				for ( int i = 0; i < terrain->heights.Num(); i++ ) {
+					terrain->heights[i] = 0.0f;
+				}
+				int sample = 0;
+				while ( src.ReadToken( &token ) ) {
+					if ( token == "}" ) {
+						break;
+					}
+					if ( sample < terrain->heights.Num() ) {
+						terrain->heights[sample++] = (float)atof( token.c_str() );
+					}
+				}
+			} else if ( !token.Icmp( "weights" ) || !token.Icmp( "paintWeights" ) ) {
+				const bool legacyWeights = !token.Icmp( "weights" );
+				src.ExpectTokenString( "{" );
+				if ( legacyWeights && terrain->paintWidth == TERRAIN_DEFAULT_PAINT_SIZE && terrain->paintHeight == TERRAIN_DEFAULT_PAINT_SIZE ) {
+					terrain->paintWidth = terrain->width;
+					terrain->paintHeight = terrain->height;
+				}
+				terrain->paintWeights.SetNum( terrain->paintWidth * terrain->paintHeight );
+				for ( int i = 0; i < terrain->paintWeights.Num(); i++ ) {
+					terrain->paintWeights[i] = idTerrainPatch::BaseLayerWeight();
+				}
+
+				int sample = 0;
+				int component = 0;
+				idVec4 weight;
+				weight.Zero();
+				while ( src.ReadToken( &token ) ) {
+					if ( token == "}" ) {
+						break;
+					}
+					weight[component++] = (float)atof( token.c_str() );
+					if ( component == 4 ) {
+						if ( sample < terrain->paintWeights.Num() ) {
+							terrain->paintWeights[sample] = idTerrainPatch::NormalizeLayerWeight( weight );
+						}
+						sample++;
+						component = 0;
+						weight.Zero();
+					}
+				}
+			}
+		}
+
+		terrain->EnsureLayerData( fallbackMaterial );
+		terrain->MarkPaintTextureDirty();
+		terrain->UpdateBounds();
+		terrains.Append( terrain );
+	}
+
+	return true;
+}
diff --git a/neo/engine/models/TerrainModel.h b/neo/engine/models/TerrainModel.h
new file mode 100644
index 00000000..120d669c
--- /dev/null
+++ b/neo/engine/models/TerrainModel.h
@@ -0,0 +1,93 @@
+/*
+===========================================================================
+
+Shared terrain source model
+
+===========================================================================
+*/
+#ifndef __MODEL_TERRAIN_H__
+#define __MODEL_TERRAIN_H__
+
+#define TERRAIN_DEFAULT_VERTS			65
+#define TERRAIN_DEFAULT_CELL_SIZE		512.0f
+#define TERRAIN_DEFAULT_PAINT_SIZE		257
+#define TERRAIN_MAX_LAYERS				4
+
+class idTerrainPatch {
+public:
+	idTerrainPatch();
+
+	idStr		name;
+	idStr		material;
+	idStr		layerMaterials[TERRAIN_MAX_LAYERS];
+	idVec3		origin;
+	int			width;
+	int			height;
+	float		cellSize;
+	idList<float> heights;
+	int			paintWidth;
+	int			paintHeight;
+	idList<idVec4> paintWeights;
+
+	// Editor preview cache state. Runtime code ignores this, but keeping it on the
+	// source object lets Radiant edit the exact model data that gets parsed/written.
+	unsigned int paintTexture;
+	bool		paintTextureDirty;
+	int			paintDirtyMinX;
+	int			paintDirtyMinY;
+	int			paintDirtyMaxX;
+	int			paintDirtyMaxY;
+
+	idBounds	bounds;
+
+	int			SampleIndex( int x, int y ) const;
+	int			PaintIndex( int x, int y ) const;
+	float		SampleHeight( int x, int y ) const;
+	void		SetHeight( int x, int y, float height );
+	bool		SetHeightBySample( int sample, float height );
+	idVec4		SamplePaintWeight( int x, int y ) const;
+	void		SetPaintWeight( int x, int y, const idVec4 &weight );
+	bool		SetPaintWeightBySample( int sample, const idVec4 &weight );
+	float		WorldWidth() const;
+	float		WorldHeight() const;
+	float		BilinearHeight( float u, float v ) const;
+	idVec3		VertexUV( float u, float v ) const;
+	idVec3		Vertex( int x, int y ) const;
+	idVec3		VertexNormal( int x, int y ) const;
+	void		UpdateBounds();
+	void		EnsureLayerData( const char *defaultMaterial );
+	void		ClearLayerWeight( int layer );
+	bool		SetLayerMaterials( const idStr layerMaterials[TERRAIN_MAX_LAYERS], const char *defaultMaterial );
+	void		MarkPaintTextureDirty();
+	void		ClearPaintTextureDirtyRect();
+	void		MarkPaintTextureDirtyRect( int minX, int minY, int maxX, int maxY );
+
+	static idVec4 BaseLayerWeight();
+	static idVec4 NormalizeLayerWeight( const idVec4 &weight );
+};
+
+class idTerrainModel {
+public:
+							idTerrainModel();
+							~idTerrainModel();
+
+	void					Clear();
+	int						NumTerrains() const;
+	idTerrainPatch *		Terrain( int index );
+	const idTerrainPatch *	Terrain( int index ) const;
+	idList<idTerrainPatch *> &Terrains();
+	const idList<idTerrainPatch *> &Terrains() const;
+
+	idTerrainPatch *		AllocDefaultTerrain( const idVec3 &center, const char *defaultMaterial, float gridSize );
+	void					AddTerrain( idTerrainPatch *terrain );
+
+	bool					LoadFile( const char *filename, const char *defaultMaterial );
+	bool					SaveFile( const char *filename );
+
+	static idStr			FileNameForMap( const char *mapFileName );
+
+private:
+	idList<idTerrainPatch *> terrains;
+};
+
+#endif
diff --git a/neo/engine/opengl/gl_d3d12shim.cpp b/neo/engine/opengl/gl_d3d12shim.cpp
index 14d6b3bb..eaae25c9 100644
--- a/neo/engine/opengl/gl_d3d12shim.cpp
+++ b/neo/engine/opengl/gl_d3d12shim.cpp
@@ -204,6 +204,9 @@ using Microsoft::WRL::ComPtr;
 #ifndef GL_QD3D12_FRAME_GENERATION
 #define GL_QD3D12_FRAME_GENERATION 0x600E
 #endif
+#ifndef GL_QD3D12_TERRAIN_BLEND
+#define GL_QD3D12_TERRAIN_BLEND 0x600F
+#endif
 #ifndef GL_QD3D12_TAA
 #define GL_QD3D12_TAA GL_QD3D12_TAA_ENABLED
 #endif
@@ -290,6 +293,12 @@ void APIENTRY glBindSpecularMapTexture(GLuint texture);
 void APIENTRY glSpecularMapTexture(GLuint texture);
 void APIENTRY glSpecularMapStrengthf(GLfloat strength);
 void APIENTRY glTextureAverageColorQD3D12(GLuint texture, GLfloat r, GLfloat g, GLfloat b, GLfloat a);
+void APIENTRY glTerrainBlendEnableQD3D12(GLboolean enable);
+void APIENTRY glEnableTerrainBlendQD3D12(GLboolean enable);
+void APIENTRY glTerrainLayerTextureQD3D12(GLuint layer, GLuint texture);
+void APIENTRY glTerrainLayerNormalTextureQD3D12(GLuint layer, GLuint texture);
+void APIENTRY glTerrainWeightTextureQD3D12(GLuint texture);
+void APIENTRY glTerrainBlendOpacityQD3D12(GLfloat opacity);
 void APIENTRY glRaytracingMaterialFlagsQD3D12(GLuint flags);
 void APIENTRY glRaytracingMaterialFlagQD3D12(GLuint flag, GLboolean enable);
 
@@ -533,7 +542,7 @@ static const UINT QD3D12_MaxQueries = 2048;
 // SECTION 3: D3D12 renderer structs
 // ============================================================
 
-static const UINT QD3D12_MaxTextureUnits = 8;
+static const UINT QD3D12_MaxTextureUnits = 11;
 static const UINT QD3D12_FrameCount = 2;
 static const UINT QD3D12_MaxTextures = 4096;
 static const UINT QD3D12_UploadBufferSize = 128 * 1024 * 1024;
@@ -841,7 +850,7 @@ struct GLBufferObject
 const char* vendor = "Justin Marshall";
 const char* renderer = "Quake D3D12 Wrapper";
 const char* version = "1.1-quake-d3d12";
-const char* extensions = "GL_SGIS_multitexture GL_ARB_multitexture GL_EXT_texture_env_add GL_ARB_texture_env_combine GL_ARB_texture_compression GL_EXT_texture_compression_s3tc GL_ARB_vertex_program GL_ARB_fragment_program GL_EXT_texture_cube_map GL_EXT_depth_bounds_test GL_EXT_stencil_two_side GL_ATI_separate_stencil GL_QD3D12_normal_map GL_QD3D12_glow_map GL_QD3D12_specular_map GL_QD3D12_glass_material GL_QD3D12_volumetric_light GL_QD3D12_dlaa GL_QD3D12_taa GL_QD3D12_tonemap_brightness GL_QD3D12_neural_pom";
+const char* extensions = "GL_SGIS_multitexture GL_ARB_multitexture GL_EXT_texture_env_add GL_ARB_texture_env_combine GL_ARB_texture_compression GL_EXT_texture_compression_s3tc GL_ARB_vertex_program GL_ARB_fragment_program GL_EXT_texture_cube_map GL_EXT_depth_bounds_test GL_EXT_stencil_two_side GL_ATI_separate_stencil GL_QD3D12_normal_map GL_QD3D12_glow_map GL_QD3D12_specular_map GL_QD3D12_terrain_blend GL_QD3D12_glass_material GL_QD3D12_volumetric_light GL_QD3D12_dlaa GL_QD3D12_taa GL_QD3D12_tonemap_brightness GL_QD3D12_neural_pom";
 
 enum TexEnvModeShader
 {
@@ -885,6 +894,13 @@ struct BatchKey
 	UINT tex0SrvIndex = 0;
 	UINT tex1SrvIndex = 0;
 	UINT textureSrvIndex[QD3D12_MaxTextureUnits] = {};
+	UINT terrainLayerSrvIndex[4] = {};
+	UINT terrainLayerNormalSrvIndex[4] = {};
+	float terrainLayerNormalMask[4] = {};
+	UINT terrainWeightSrvIndex = 0;
+	float useTerrainBlend = 0.0f;
+	float useTerrainWeightTexture = 0.0f;
+	float terrainBlendOpacity = 1.0f;
 	UINT normalMapSrvIndex = 0;
 	float useNormalMap = 0.0f;
 	float normalMapStrength = 1.0f;
@@ -1039,6 +1055,13 @@ static uint64_t QD3D12_HashBatchKey(const BatchKey& key)
 	QD3D12_MixHash(h, key.tex0SrvIndex);
 	QD3D12_MixHash(h, key.tex1SrvIndex);
 	QD3D12_MixHashBytes(h, key.textureSrvIndex, sizeof(key.textureSrvIndex));
+	QD3D12_MixHashBytes(h, key.terrainLayerSrvIndex, sizeof(key.terrainLayerSrvIndex));
+	QD3D12_MixHashBytes(h, key.terrainLayerNormalSrvIndex, sizeof(key.terrainLayerNormalSrvIndex));
+	QD3D12_MixHashBytes(h, key.terrainLayerNormalMask, sizeof(key.terrainLayerNormalMask));
+	QD3D12_MixHash(h, key.terrainWeightSrvIndex);
+	QD3D12_MixHashFloat(h, key.useTerrainBlend);
+	QD3D12_MixHashFloat(h, key.useTerrainWeightTexture);
+	QD3D12_MixHashFloat(h, key.terrainBlendOpacity);
 	QD3D12_MixHash(h, key.normalMapSrvIndex);
 	QD3D12_MixHashFloat(h, key.useNormalMap);
 	QD3D12_MixHashFloat(h, key.normalMapStrength);
@@ -1167,6 +1190,13 @@ static bool BatchKeyDeepEquals(const BatchKey& a, const BatchKey& b)
 		memcmp(a.currentColor, b.currentColor, sizeof(a.currentColor)) == 0 &&
 		a.useVertexColor == b.useVertexColor &&
 		a.colorWriteMask == b.colorWriteMask &&
+		memcmp(a.terrainLayerSrvIndex, b.terrainLayerSrvIndex, sizeof(a.terrainLayerSrvIndex)) == 0 &&
+		memcmp(a.terrainLayerNormalSrvIndex, b.terrainLayerNormalSrvIndex, sizeof(a.terrainLayerNormalSrvIndex)) == 0 &&
+		memcmp(a.terrainLayerNormalMask, b.terrainLayerNormalMask, sizeof(a.terrainLayerNormalMask)) == 0 &&
+		a.terrainWeightSrvIndex == b.terrainWeightSrvIndex &&
+		a.useTerrainBlend == b.useTerrainBlend &&
+		a.useTerrainWeightTexture == b.useTerrainWeightTexture &&
+		a.terrainBlendOpacity == b.terrainBlendOpacity &&
 		a.cullFaceEnabled == b.cullFaceEnabled &&
 		a.cullMode == b.cullMode &&
 		a.frontFace == b.frontFace &&
@@ -1749,6 +1779,11 @@ struct GLState
 	float currentGlowMapStrength = 1.0f;
 	GLuint currentSpecularMapTexture = 0;
 	float currentSpecularMapStrength = 1.0f;
+	bool terrainBlendEnabled = false;
+	GLuint terrainLayerTextures[4] = {};
+	GLuint terrainLayerNormalTextures[4] = {};
+	GLuint terrainWeightTexture = 0;
+	float terrainBlendOpacity = 1.0f;
 	ImmediateVertexBuffer immediateVerts;
 	BatchKey cachedImmediateBatchKey{};
 	uint64_t cachedImmediateBatchStamp = 0;
@@ -3078,6 +3113,10 @@ cbuffer DrawCB : register(b0)
 #define gUseNeuralPOM       gNeuralPomPad.x
 #define gNeuralPOMDebug     gNeuralPomPad.y
 #define gUseVertexColor     gVertexColorPad.x
+#define gUseTerrainBlend    gVertexColorPad.y
+#define gTerrainBlendOpacity gVertexColorPad.z
+#define gUseTerrainWeightTexture gVertexColorPad.w
+#define gTerrainNormalMask  gCurrentColor
 // Runtime Neural POM relief controls.  x/y keep the existing enable/debug ABI;
 // z deepens the learned UV ray offset and w deepens the learned normal slope.
 // The CPU fills these from glNormalMapStrengthf() so existing material calls
@@ -3114,6 +3153,10 @@ Texture2D gGlowMap : register(t3);
 Texture2D gSpecularMap : register(t4);
 ByteAddressBuffer gNeuralPomWeights : register(t5);
 ByteAddressBuffer gNeuralPomLatent  : register(t6);
+Texture2D gTerrainNormal0 : register(t7);
+Texture2D gTerrainNormal1 : register(t8);
+Texture2D gTerrainNormal2 : register(t9);
+Texture2D gTerrainNormal3 : register(t10);
 SamplerState gSamp0 : register(s0);
 SamplerState gSamp1 : register(s1);
 SamplerState gSamp2 : register(s2);
@@ -4122,8 +4165,13 @@ QD3D12MaterialEval QD3D12_BuildMaterialEval(VSOut i)
     return m;
 }
 
+float4 BuildTerrainColor(VSOut i);
+
 float4 BuildTexturedColorCached(VSOut i, QD3D12MaterialEval m)
 {
+    if (gUseTerrainBlend > 0.5)
+        return BuildTerrainColor(i);
+
     float4 primary = i.col;
     float4 outColor = primary;
 
@@ -4187,8 +4235,80 @@ float4 BuildGlowEmission(VSOut i)
 }
 )HLSL"
 R"HLSL(
+float4 QD3D12_NormalizeTerrainWeights(float4 weights)
+{
+    weights = max(weights, 0.0);
+    float sum = weights.x + weights.y + weights.z + weights.w;
+    if (sum <= 0.0001)
+        return float4(1.0, 0.0, 0.0, 0.0);
+    return weights / sum;
+}
+
+float4 QD3D12_GetTerrainWeights(VSOut i)
+{
+    float4 weights = (gUseTerrainWeightTexture > 0.5)
+        ? gSpecularMap.Sample(gSamp4, i.uv1)
+        : i.col;
+    return QD3D12_NormalizeTerrainWeights(weights);
+}
+
+float4 BuildTerrainColor(VSOut i)
+{
+    float4 weights = QD3D12_GetTerrainWeights(i);
+    float4 layer0 = gTex0.Sample(gSamp0, i.uv0);
+    float4 layer1 = gTex1.Sample(gSamp1, i.uv0);
+    float4 layer2 = gNormalMap.Sample(gSamp2, i.uv0);
+    float4 layer3 = gGlowMap.Sample(gSamp3, i.uv0);
+
+    float4 color =
+        layer0 * weights.x +
+        layer1 * weights.y +
+        layer2 * weights.z +
+        layer3 * weights.w;
+
+    color.a *= saturate(gTerrainBlendOpacity);
+    return ApplyFog(color, i.fogCoord);
+}
+
+float3 QD3D12_BuildTerrainGBufferNormal(VSOut i)
+{
+    float4 weights = QD3D12_GetTerrainWeights(i);
+    float3 baseNormal = QD3D12_SafeNormalize(i.normal, float3(0.0, 0.0, 1.0));
+    float3 tangent, binormal;
+    QD3D12_BuildPixelTBN(i, baseNormal, tangent, binormal);
+
+    float3 n0 = (gTerrainNormalMask.x > 0.5)
+        ? QD3D12_DecodeTangentSpaceNormal(gTerrainNormal0.Sample(gSamp2, i.uv0).xyz)
+        : float3(0.0, 0.0, 1.0);
+    float3 n1 = (gTerrainNormalMask.y > 0.5)
+        ? QD3D12_DecodeTangentSpaceNormal(gTerrainNormal1.Sample(gSamp2, i.uv0).xyz)
+        : float3(0.0, 0.0, 1.0);
+    float3 n2 = (gTerrainNormalMask.z > 0.5)
+        ? QD3D12_DecodeTangentSpaceNormal(gTerrainNormal2.Sample(gSamp2, i.uv0).xyz)
+        : float3(0.0, 0.0, 1.0);
+    float3 n3 = (gTerrainNormalMask.w > 0.5)
+        ? QD3D12_DecodeTangentSpaceNormal(gTerrainNormal3.Sample(gSamp2, i.uv0).xyz)
+        : float3(0.0, 0.0, 1.0);
+
+    float3 tangentNormal = QD3D12_SafeNormalize(
+        n0 * weights.x +
+        n1 * weights.y +
+        n2 * weights.z +
+        n3 * weights.w,
+        float3(0.0, 0.0, 1.0));
+
+    return QD3D12_SafeNormalize(
+        tangentNormal.x * tangent +
+        tangentNormal.y * binormal +
+        tangentNormal.z * baseNormal,
+        baseNormal);
+}
+
 float4 BuildSpecularAlbedoCached(VSOut i, QD3D12MaterialEval m)
 {
+    if (gUseTerrainBlend > 0.5)
+        return float4(0.0, 0.0, 0.0, 0.0);
+
     if (gUseSpecularMap > 0.0)
     {
         float2 specUv = m.uv0;
@@ -4228,6 +4348,9 @@ float3 BuildGBufferNormalCached(VSOut i, QD3D12MaterialEval m)
 {
     float3 n = QD3D12_SafeNormalize(i.normal, float3(0.0, 0.0, 1.0));
 
+    if (gUseTerrainBlend > 0.5)
+        return QD3D12_BuildTerrainGBufferNormal(i);
+
     if (gUseNormalMap < 0.5 && (gUseNeuralPOM < 0.5 || m.neural.active <= 0.5))
         return n;
 
@@ -6062,6 +6185,11 @@ static BatchKey BuildCurrentBatchKey(GLenum originalMode, const TextureResource*
 	key.tex1SrvIndex = (useTex1 && tex1 && tex1->srvIndex != UINT_MAX) ? tex1->srvIndex : g_gl.whiteTexture.srvIndex;
 	for (UINT i = 0; i < QD3D12_MaxTextureUnits; ++i)
 		key.textureSrvIndex[i] = (allTextures && allTextures[i]) ? allTextures[i]->srvIndex : 0;
+	for (UINT layer = 0; layer < 4; ++layer)
+	{
+		key.terrainLayerNormalSrvIndex[layer] = g_gl.whiteTexture.srvIndex;
+		key.terrainLayerNormalMask[layer] = 0.0f;
+	}
 
 	TextureResource* normalMap = selectedMapsValid ? selectedNormalMap : QD3D12_SelectNormalMapTexture(allTextures);
 	if (normalMap && normalMap->texture && normalMap->srvIndex != UINT_MAX && normalMap->gpuValid)
@@ -6144,7 +6272,53 @@ static BatchKey BuildCurrentBatchKey(GLenum originalMode, const TextureResource*
 		key.useNeuralPOM = 0.0f;
 	}
 
-	key.useARBPrograms = QD3D12ARB_IsActive();
+	if (g_gl.terrainBlendEnabled)
+	{
+		key.useTerrainBlend = 1.0f;
+		key.terrainBlendOpacity = ClampValue<float>(g_gl.terrainBlendOpacity, 0.0f, 1.0f);
+		for (UINT layer = 0; layer < 4; ++layer)
+		{
+			TextureResource* terrainTex = QD3D12_FindTextureResource(g_gl.terrainLayerTextures[layer]);
+			if (terrainTex && terrainTex->texture && terrainTex->srvIndex != UINT_MAX && terrainTex->gpuValid)
+				key.terrainLayerSrvIndex[layer] = terrainTex->srvIndex;
+			else
+				key.terrainLayerSrvIndex[layer] = g_gl.whiteTexture.srvIndex;
+
+			TextureResource* terrainNormalTex = QD3D12_FindTextureResource(g_gl.terrainLayerNormalTextures[layer]);
+			if (terrainNormalTex && terrainNormalTex->texture && terrainNormalTex->srvIndex != UINT_MAX && terrainNormalTex->gpuValid)
+			{
+				key.terrainLayerNormalSrvIndex[layer] = terrainNormalTex->srvIndex;
+				key.terrainLayerNormalMask[layer] = 1.0f;
+			}
+		}
+
+		TextureResource* terrainWeightTex = QD3D12_FindTextureResource(g_gl.terrainWeightTexture);
+		if (terrainWeightTex && terrainWeightTex->texture && terrainWeightTex->srvIndex != UINT_MAX && terrainWeightTex->gpuValid)
+		{
+			key.terrainWeightSrvIndex = terrainWeightTex->srvIndex;
+			key.useTerrainWeightTexture = 1.0f;
+		}
+		else
+		{
+			key.terrainWeightSrvIndex = g_gl.whiteTexture.srvIndex;
+			key.useTerrainWeightTexture = 0.0f;
+		}
+
+		key.tex0SrvIndex = key.terrainLayerSrvIndex[0];
+		key.tex1SrvIndex = key.terrainLayerSrvIndex[1];
+		key.normalMapSrvIndex = key.terrainLayerSrvIndex[2];
+		key.glowMapSrvIndex = key.terrainLayerSrvIndex[3];
+		key.specularMapSrvIndex = key.terrainWeightSrvIndex;
+		key.useNormalMap = 0.0f;
+		key.useGlowMap = 0.0f;
+		key.useSpecularMap = 0.0f;
+		key.useNeuralPOM = 0.0f;
+		key.useTessellation = false;
+		key.useVertexColor = 1.0f;
+		key.pipeline = PickPipeline(true, false);
+	}
+
+	key.useARBPrograms = !g_gl.terrainBlendEnabled && QD3D12ARB_IsActive();
 	if (key.useARBPrograms)
 	{
 		key.arbVertexProgram = QD3D12ARB_GetBoundVertexProgram();
@@ -6191,6 +6365,14 @@ static BatchKey BuildCurrentBatchKey(GLenum originalMode, const TextureResource*
 	key.currentColor[2] = g_gl.curColor[2];
 	key.currentColor[3] = g_gl.curColor[3];
 	key.useVertexColor = g_gl.colorArray.enabled ? 1.0f : 0.0f;
+	if (key.useTerrainBlend > 0.5f)
+	{
+		key.useTex0 = 1.0f;
+		key.useTex1 = 0.0f;
+		key.tex1IsLightmap = 0.0f;
+		key.useVertexColor = 1.0f;
+		key.pipeline = PickPipeline(true, false);
+	}
 	QD3D12_FillTexCombineKey(key, 0);
 	QD3D12_FillTexCombineKey(key, 1);
 	key.colorWriteMask = QD3D12_CurrentColorWriteMask();
@@ -6238,6 +6420,8 @@ static BatchKey BuildCurrentBatchKey(GLenum originalMode, const TextureResource*
 	key.useTessellation = QD3D12_ShouldEnableNormalMapTessellation(originalMode, key);
 	if (key.useNeuralPOM > 0.5f)
 		key.useTessellation = false;
+	if (key.useTerrainBlend > 0.5f)
+		key.useTessellation = false;
 	if (key.useARBPrograms)
 		key.useTessellation = false;
 	g_gl.currObjectMVPs[key.motionObjectId] = key.mvp;
@@ -6381,6 +6565,17 @@ static uint64_t QD3D12_CurrentImmediateBatchStateStamp(
 	QD3D12_MixHashFloat(h, g_gl.currentGlowMapStrength);
 	QD3D12_MixHash(h, g_gl.currentSpecularMapTexture);
 	QD3D12_MixHashFloat(h, g_gl.currentSpecularMapStrength);
+	QD3D12_MixHash(h, g_gl.terrainBlendEnabled ? 1ull : 0ull);
+	for (UINT i = 0; i < 4; ++i)
+	{
+		QD3D12_MixHash(h, g_gl.terrainLayerTextures[i]);
+		QD3D12_MixTextureStamp(h, QD3D12_FindTextureResource(g_gl.terrainLayerTextures[i]));
+		QD3D12_MixHash(h, g_gl.terrainLayerNormalTextures[i]);
+		QD3D12_MixTextureStamp(h, QD3D12_FindTextureResource(g_gl.terrainLayerNormalTextures[i]));
+	}
+	QD3D12_MixHash(h, g_gl.terrainWeightTexture);
+	QD3D12_MixTextureStamp(h, QD3D12_FindTextureResource(g_gl.terrainWeightTexture));
+	QD3D12_MixHashFloat(h, g_gl.terrainBlendOpacity);
 
 	return h ? h : 1ull;
 }
@@ -6443,6 +6638,17 @@ static uint64_t QD3D12_GatherImmediateTextureCandidates(bool arbProgramsActive,
 	QD3D12_MixHash(h, g_gl.currentSpecularMapTexture);
 	QD3D12_MixHash(h, g_gl.currentNeuralPOMTexture);
 	QD3D12_MixHash(h, g_gl.neuralPOMEnabled ? 1ull : 0ull);
+	QD3D12_MixHash(h, g_gl.terrainBlendEnabled ? 1ull : 0ull);
+	for (UINT layer = 0; layer < 4; ++layer)
+	{
+		QD3D12_MixHash(h, g_gl.terrainLayerTextures[layer]);
+		QD3D12_MixTextureStamp(h, QD3D12_FindTextureResource(g_gl.terrainLayerTextures[layer]));
+		QD3D12_MixHash(h, g_gl.terrainLayerNormalTextures[layer]);
+		QD3D12_MixTextureStamp(h, QD3D12_FindTextureResource(g_gl.terrainLayerNormalTextures[layer]));
+	}
+	QD3D12_MixHash(h, g_gl.terrainWeightTexture);
+	QD3D12_MixTextureStamp(h, QD3D12_FindTextureResource(g_gl.terrainWeightTexture));
+	QD3D12_MixHashFloat(h, g_gl.terrainBlendOpacity);
 
 	for (UINT unit = 0; unit < QD3D12_MaxTextureUnits; ++unit)
 	{
@@ -6472,6 +6678,12 @@ static uint64_t QD3D12_GatherImmediateTextureCandidates(bool arbProgramsActive,
 	QD3D12_MixTextureStamp(h, g_gl.currentGlowMapTexture != 0 ? QD3D12_FindTextureResource(g_gl.currentGlowMapTexture) : nullptr);
 	QD3D12_MixTextureStamp(h, g_gl.currentSpecularMapTexture != 0 ? QD3D12_FindTextureResource(g_gl.currentSpecularMapTexture) : nullptr);
 	QD3D12_MixTextureStamp(h, g_gl.currentNeuralPOMTexture != 0 ? QD3D12_FindTextureResource(g_gl.currentNeuralPOMTexture) : nullptr);
+	for (UINT layer = 0; layer < 4; ++layer)
+	{
+		QD3D12_MixTextureStamp(h, g_gl.terrainLayerTextures[layer] != 0 ? QD3D12_FindTextureResource(g_gl.terrainLayerTextures[layer]) : nullptr);
+		QD3D12_MixTextureStamp(h, g_gl.terrainLayerNormalTextures[layer] != 0 ? QD3D12_FindTextureResource(g_gl.terrainLayerNormalTextures[layer]) : nullptr);
+	}
+	QD3D12_MixTextureStamp(h, g_gl.terrainWeightTexture != 0 ? QD3D12_FindTextureResource(g_gl.terrainWeightTexture) : nullptr);
 
 	return h ? h : 1ull;
 }
@@ -6497,6 +6709,31 @@ static QD3D12PreparedImmediateTextures QD3D12_PrepareImmediateTextures(bool arbP
 		}
 	}
 
+	if (g_gl.terrainBlendEnabled)
+	{
+		for (UINT layer = 0; layer < 4; ++layer)
+		{
+			TextureResource* tex = QD3D12_FindTextureResource(g_gl.terrainLayerTextures[layer]);
+			if (tex && tex != &g_gl.whiteTexture && !tex->gpuValid)
+			{
+				EnsureTextureResource(*tex);
+				UploadTexture(*tex);
+			}
+			TextureResource* normalTex = QD3D12_FindTextureResource(g_gl.terrainLayerNormalTextures[layer]);
+			if (normalTex && normalTex != &g_gl.whiteTexture && !normalTex->gpuValid)
+			{
+				EnsureTextureResource(*normalTex);
+				UploadTexture(*normalTex);
+			}
+		}
+		TextureResource* weightTex = QD3D12_FindTextureResource(g_gl.terrainWeightTexture);
+		if (weightTex && weightTex != &g_gl.whiteTexture && !weightTex->gpuValid)
+		{
+			EnsureTextureResource(*weightTex);
+			UploadTexture(*weightTex);
+		}
+	}
+
 	prepared.normalMapTex = QD3D12_SelectNormalMapTexture(prepared.boundTextures);
 	if (prepared.normalMapTex && prepared.normalMapTex != &g_gl.whiteTexture && !prepared.normalMapTex->gpuValid)
 	{
@@ -13376,6 +13613,70 @@ static void QD3D12_CopyRGBARegionIntoTexture(TextureResource& tex, GLint xoffset
 	QD3D12_InvalidateTextureMipChain(tex, true);
 }
 
+static bool QD3D12_UploadRGBA8RegionToTexture(TextureResource& tex, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, const uint8_t* rgbaBytes)
+{
+	if (!g_currentWindow || !g_gl.cmdList || !g_gl.frameOpen || !tex.texture || !tex.gpuValid || !rgbaBytes)
+		return false;
+	if (tex.compressed || tex.dxgiFormat != DXGI_FORMAT_R8G8B8A8_UNORM)
+		return false;
+	if (xoffset < 0 || yoffset < 0 || width <= 0 || height <= 0 || xoffset + width > tex.width || yoffset + height > tex.height)
+		return false;
+
+	ID3D12GraphicsCommandList* cl = g_gl.cmdList.Get();
+	if (tex.state != D3D12_RESOURCE_STATE_COPY_DEST)
+	{
+		D3D12_RESOURCE_BARRIER toCopy{};
+		toCopy.Type = D3D12_RESOURCE_BARRIER_TYPE_TRANSITION;
+		toCopy.Transition.pResource = tex.texture.Get();
+		toCopy.Transition.StateBefore = tex.state;
+		toCopy.Transition.StateAfter = D3D12_RESOURCE_STATE_COPY_DEST;
+		toCopy.Transition.Subresource = D3D12_RESOURCE_BARRIER_ALL_SUBRESOURCES;
+		cl->ResourceBarrier(1, &toCopy);
+		tex.state = D3D12_RESOURCE_STATE_COPY_DEST;
+	}
+
+	const UINT srcRowBytes = (UINT)width * 4u;
+	const UINT rowPitch = (srcRowBytes + 255u) & ~255u;
+	const UINT uploadSize = rowPitch * (UINT)height;
+	UploadAlloc alloc = QD3D12_AllocUpload(uploadSize, D3D12_TEXTURE_DATA_PLACEMENT_ALIGNMENT);
+	uint8_t* dstBase = (uint8_t*)alloc.cpu;
+	memset(dstBase, 0, uploadSize);
+	for (UINT row = 0; row < (UINT)height; ++row)
+	{
+		memcpy(dstBase + (size_t)row * rowPitch,
+			rgbaBytes + (size_t)row * srcRowBytes,
+			srcRowBytes);
+	}
+
+	D3D12_TEXTURE_COPY_LOCATION srcLoc{};
+	srcLoc.pResource = g_currentWindow->upload.resource[g_currentWindow->frameIndex].Get();
+	srcLoc.Type = D3D12_TEXTURE_COPY_TYPE_PLACED_FOOTPRINT;
+	srcLoc.PlacedFootprint.Offset = alloc.offset;
+	srcLoc.PlacedFootprint.Footprint.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
+	srcLoc.PlacedFootprint.Footprint.Width = (UINT)width;
+	srcLoc.PlacedFootprint.Footprint.Height = (UINT)height;
+	srcLoc.PlacedFootprint.Footprint.Depth = 1;
+	srcLoc.PlacedFootprint.Footprint.RowPitch = rowPitch;
+
+	D3D12_TEXTURE_COPY_LOCATION dstLoc{};
+	dstLoc.pResource = tex.texture.Get();
+	dstLoc.Type = D3D12_TEXTURE_COPY_TYPE_SUBRESOURCE_INDEX;
+	dstLoc.SubresourceIndex = 0;
+	cl->CopyTextureRegion(&dstLoc, (UINT)xoffset, (UINT)yoffset, 0, &srcLoc, nullptr);
+
+	D3D12_RESOURCE_BARRIER toSrv{};
+	toSrv.Type = D3D12_RESOURCE_BARRIER_TYPE_TRANSITION;
+	toSrv.Transition.pResource = tex.texture.Get();
+	toSrv.Transition.StateBefore = D3D12_RESOURCE_STATE_COPY_DEST;
+	toSrv.Transition.StateAfter = D3D12_RESOURCE_STATE_PIXEL_SHADER_RESOURCE | D3D12_RESOURCE_STATE_NON_PIXEL_SHADER_RESOURCE;
+	toSrv.Transition.Subresource = D3D12_RESOURCE_BARRIER_ALL_SUBRESOURCES;
+	cl->ResourceBarrier(1, &toSrv);
+
+	tex.state = D3D12_RESOURCE_STATE_PIXEL_SHADER_RESOURCE | D3D12_RESOURCE_STATE_NON_PIXEL_SHADER_RESOURCE;
+	tex.gpuValid = true;
+	return true;
+}
+
 static PipelineMode PickPipeline(bool useTex0, bool useTex1)
 {
 	const bool textured = useTex0 || useTex1;
@@ -13793,6 +14094,7 @@ static void QD3D12_FlushQueuedBatches()
 	D3D12_GPU_DESCRIPTOR_HANDLE lastSpecularMap{};
 	D3D12_GPU_DESCRIPTOR_HANDLE lastNeuralWeights{};
 	D3D12_GPU_DESCRIPTOR_HANDLE lastNeuralLatent{};
+	D3D12_GPU_DESCRIPTOR_HANDLE lastTerrainNormal[4]{};
 	bool haveLastTex0 = false;
 	bool haveLastTex1 = false;
 	bool haveLastNormalMap = false;
@@ -13800,6 +14102,7 @@ static void QD3D12_FlushQueuedBatches()
 	bool haveLastSpecularMap = false;
 	bool haveLastNeuralWeights = false;
 	bool haveLastNeuralLatent = false;
+	bool haveLastTerrainNormal[4] = {};
 	D3D12_PRIMITIVE_TOPOLOGY lastTopo = D3D_PRIMITIVE_TOPOLOGY_UNDEFINED;
 
 	for (size_t i = 0; i < g_gl.queuedBatches.size(); ++i)
@@ -13940,10 +14243,12 @@ static void QD3D12_FlushQueuedBatches()
 		dc->neuralPomPad[2] = ClampValue<float>(1.0f + (neuralStrength - 1.0f) * 0.65f, 1.0f, 3.0f);
 		dc->neuralPomPad[3] = ClampValue<float>(1.0f + (neuralStrength - 1.0f) * 0.45f, 1.0f, 2.5f);
 		memcpy(dc->currentColor, batch.key.currentColor, sizeof(dc->currentColor));
+		if (batch.key.useTerrainBlend > 0.5f)
+			memcpy(dc->currentColor, batch.key.terrainLayerNormalMask, sizeof(dc->currentColor));
 		dc->vertexColorPad[0] = batch.key.useVertexColor;
-		dc->vertexColorPad[1] = 0.0f;
-		dc->vertexColorPad[2] = 0.0f;
-		dc->vertexColorPad[3] = 0.0f;
+		dc->vertexColorPad[1] = batch.key.useTerrainBlend;
+		dc->vertexColorPad[2] = batch.key.terrainBlendOpacity;
+		dc->vertexColorPad[3] = batch.key.useTerrainWeightTexture;
 
 		if (batch.key.useARBPrograms && batch.key.arbConstants)
 		{
@@ -14010,6 +14315,8 @@ static void QD3D12_FlushQueuedBatches()
 			haveLastSpecularMap = false;
 			haveLastNeuralWeights = false;
 			haveLastNeuralLatent = false;
+			for (UINT layer = 0; layer < 4; ++layer)
+				haveLastTerrainNormal[layer] = false;
 		}
 		else
 		{
@@ -14092,6 +14399,21 @@ static void QD3D12_FlushQueuedBatches()
 				lastNeuralLatent = neuralLatentGpu;
 				haveLastNeuralLatent = true;
 			}
+
+			for (UINT layer = 0; layer < 4; ++layer)
+			{
+				UINT terrainNormalSrvIndex = batch.key.terrainLayerNormalSrvIndex[layer];
+				if (terrainNormalSrvIndex == UINT_MAX)
+					terrainNormalSrvIndex = g_gl.whiteTexture.srvIndex;
+
+				D3D12_GPU_DESCRIPTOR_HANDLE terrainNormalGpu = QD3D12_SrvGpu(terrainNormalSrvIndex);
+				if (!haveLastTerrainNormal[layer] || terrainNormalGpu.ptr != lastTerrainNormal[layer].ptr)
+				{
+					g_gl.cmdList->SetGraphicsRootDescriptorTable(8 + layer, terrainNormalGpu);
+					lastTerrainNormal[layer] = terrainNormalGpu;
+					haveLastTerrainNormal[layer] = true;
+				}
+			}
 		}
 
 		g_gl.cmdList->SetGraphicsRootConstantBufferView(0, cbAlloc.gpu);
@@ -15002,6 +15324,57 @@ void APIENTRY glTextureAverageColorQD3D12(GLuint texture, GLfloat r, GLfloat g,
 	tex.cpuGeneration++;
 }
 
+void APIENTRY glTerrainBlendEnableQD3D12(GLboolean enable)
+{
+	g_gl.terrainBlendEnabled = (enable != GL_FALSE);
+}
+
+void APIENTRY glEnableTerrainBlendQD3D12(GLboolean enable)
+{
+	glTerrainBlendEnableQD3D12(enable);
+}
+
+void APIENTRY glTerrainLayerTextureQD3D12(GLuint layer, GLuint texture)
+{
+	if (layer >= 4)
+	{
+		g_gl.lastError = GL_INVALID_VALUE;
+		return;
+	}
+
+	if (texture != 0)
+		(void)QD3D12_EnsureTextureName(texture);
+
+	g_gl.terrainLayerTextures[layer] = texture;
+}
+
+void APIENTRY glTerrainLayerNormalTextureQD3D12(GLuint layer, GLuint texture)
+{
+	if (layer >= 4)
+	{
+		g_gl.lastError = GL_INVALID_VALUE;
+		return;
+	}
+
+	if (texture != 0)
+		(void)QD3D12_EnsureTextureName(texture);
+
+	g_gl.terrainLayerNormalTextures[layer] = texture;
+}
+
+void APIENTRY glTerrainWeightTextureQD3D12(GLuint texture)
+{
+	if (texture != 0)
+		(void)QD3D12_EnsureTextureName(texture);
+
+	g_gl.terrainWeightTexture = texture;
+}
+
+void APIENTRY glTerrainBlendOpacityQD3D12(GLfloat opacity)
+{
+	g_gl.terrainBlendOpacity = ClampValue<float>(opacity, 0.0f, 1.0f);
+}
+
 void APIENTRY glRaytracingMaterialFlagsQD3D12(GLuint flags)
 {
 	g_gl.currentRayMaterialFlags = QD3D12_ClampRayMaterialFlags((uint32_t)flags);
@@ -15975,6 +16348,9 @@ void APIENTRY glTexSubImage2D(GLenum, GLint level, GLint xoffset, GLint yoffset,
 	}
 
 	const int bpp = BytesPerPixel(format, type);
+	if (bpp <= 0 || xoffset < 0 || yoffset < 0 || width <= 0 || height <= 0 || xoffset + width > tex.width || yoffset + height > tex.height)
+		return;
+
 	if (tex.sysmem.empty())
 		tex.sysmem.resize((size_t)tex.width * (size_t)tex.height * (size_t)bpp);
 
@@ -15986,7 +16362,21 @@ void APIENTRY glTexSubImage2D(GLenum, GLint level, GLint xoffset, GLint yoffset,
 		memcpy(tex.sysmem.data() + dstOff, src + srcOff, (size_t)width * (size_t)bpp);
 	}
 
-	QD3D12_InvalidateTextureMipChain(tex, true);
+	const bool canUploadRegion =
+		format == GL_RGBA &&
+		type == GL_UNSIGNED_BYTE &&
+		bpp == 4 &&
+		tex.dxgiFormat == DXGI_FORMAT_R8G8B8A8_UNORM;
+
+	QD3D12_InvalidateTextureMipChain(tex, !canUploadRegion);
+	EnsureTextureResource(tex);
+	if (canUploadRegion && QD3D12_UploadRGBA8RegionToTexture(tex, xoffset, yoffset, width, height, src))
+	{
+		EnsureTextureResource(tex);
+		return;
+	}
+
+	tex.gpuValid = false;
 	EnsureTextureResource(tex);
 }
 
@@ -18125,6 +18515,12 @@ PROC WINAPI qd3d12_wglGetProcAddress(LPCSTR name) {
 		{ "glBindSpecularMapTexture",    (PROC)glBindSpecularMapTexture },
 		{ "glSpecularMapTexture",        (PROC)glSpecularMapTexture },
 		{ "glSpecularMapStrengthf",      (PROC)glSpecularMapStrengthf },
+		{ "glTerrainBlendEnableQD3D12",  (PROC)glTerrainBlendEnableQD3D12 },
+		{ "glEnableTerrainBlendQD3D12",  (PROC)glEnableTerrainBlendQD3D12 },
+		{ "glTerrainLayerTextureQD3D12", (PROC)glTerrainLayerTextureQD3D12 },
+		{ "glTerrainLayerNormalTextureQD3D12", (PROC)glTerrainLayerNormalTextureQD3D12 },
+		{ "glTerrainWeightTextureQD3D12", (PROC)glTerrainWeightTextureQD3D12 },
+		{ "glTerrainBlendOpacityQD3D12", (PROC)glTerrainBlendOpacityQD3D12 },
 		{ "glGlassMaterialQD3D12",       (PROC)glGlassMaterialQD3D12 },
 		{ "glMaterialGlassQD3D12",       (PROC)glMaterialGlassQD3D12 },
 		{ "glRaytracingMaterialFlagsQD3D12", (PROC)glRaytracingMaterialFlagsQD3D12 },
diff --git a/neo/engine/opengl/gl_raytracing.cpp b/neo/engine/opengl/gl_raytracing.cpp
new file mode 100644
index 00000000..b933d228
--- /dev/null
+++ b/neo/engine/opengl/gl_raytracing.cpp
@@ -0,0 +1,7230 @@
+/*
+===========================================================================
+
+IceTech GPL Source Code
+Copyright (C) 2026 Justin Marshall
+
+This file is part of the IceTech GPL Source Code (?IceTech Source Code?).
+
+IceTech Source Code is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+IceTech Source Code is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with IceTech Source Code.  If not, see <http://www.gnu.org/licenses/>.
+
+If you have questions concerning this license or the applicable additional terms, you may contact in writing Justin Marshall, justinmarshall20@gmail.com
+
+===========================================================================
+*/
+
+#include "opengl.h"
+
+#include <windows.h>
+#include <d3d12.h>
+#include <dxgi1_6.h>
+#include <d3dcompiler.h>
+#include <dxcapi.h>
+#include <wrl/client.h>
+
+#include <stdint.h>
+#include <vector>
+#include <thread>
+#include <atomic>
+#include <mutex>
+#include <algorithm>
+#include <string.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <assert.h>
+
+#pragma comment(lib, "dxcompiler.lib")
+#pragma comment(lib, "d3dcompiler.lib")
+
+using Microsoft::WRL::ComPtr;
+
+extern float com_pathTracingGpuMsec;
+
+// ============================================================
+// Logging / checks
+// ============================================================
+
+static void glRaytracingLog(const char* fmt, ...)
+{
+	char buffer[4096];
+	va_list args;
+	va_start(args, fmt);
+	vsnprintf(buffer, sizeof(buffer), fmt, args);
+	va_end(args);
+	OutputDebugStringA(buffer);
+	OutputDebugStringA("\n");
+}
+
+static void glRaytracingFatal(const char* fmt, ...)
+{
+	char buffer[4096];
+	va_list args;
+	va_start(args, fmt);
+	vsnprintf(buffer, sizeof(buffer), fmt, args);
+	va_end(args);
+	OutputDebugStringA(buffer);
+	OutputDebugStringA("\n");
+	MessageBoxA(nullptr, buffer, "glRaytracing Fatal", MB_OK | MB_ICONERROR);
+	DebugBreak();
+}
+
+#define GLR_CHECK(x) \
+    do { HRESULT _hr = (x); if (FAILED(_hr)) { glRaytracingFatal("HRESULT 0x%08X failed at %s:%d", (unsigned)_hr, __FILE__, __LINE__); return 0; } } while (0)
+
+#define GLR_CHECKV(x) \
+    do { HRESULT _hr = (x); if (FAILED(_hr)) { glRaytracingFatal("HRESULT 0x%08X failed at %s:%d", (unsigned)_hr, __FILE__, __LINE__); return; } } while (0)
+
+// ============================================================
+// Helpers
+// ============================================================
+
+static UINT64 glRaytracingAlignUp(UINT64 v, UINT64 a)
+{
+	return (v + (a - 1)) & ~(a - 1);
+}
+
+template<typename T>
+static T glRaytracingClamp(T v, T lo, T hi)
+{
+	return (v < lo) ? lo : ((v > hi) ? hi : v);
+}
+
+static void glRaytracingSetIdentity4x4(float* m)
+{
+	if (!m)
+		return;
+
+	memset(m, 0, sizeof(float) * 16);
+	m[0] = 1.0f;
+	m[5] = 1.0f;
+	m[10] = 1.0f;
+	m[15] = 1.0f;
+}
+
+static int glRaytracingInvertMatrix4x4(const float* m, float* out)
+{
+	if (!m || !out)
+		return 0;
+
+	float a[4][8];
+
+	for (int r = 0; r < 4; ++r)
+	{
+		for (int c = 0; c < 4; ++c)
+			a[r][c] = m[r * 4 + c];
+
+		for (int c = 0; c < 4; ++c)
+			a[r][4 + c] = (r == c) ? 1.0f : 0.0f;
+	}
+
+	for (int col = 0; col < 4; ++col)
+	{
+		int pivot = col;
+		float best = a[col][col] < 0.0f ? -a[col][col] : a[col][col];
+
+		for (int r = col + 1; r < 4; ++r)
+		{
+			const float v = a[r][col] < 0.0f ? -a[r][col] : a[r][col];
+			if (v > best)
+			{
+				best = v;
+				pivot = r;
+			}
+		}
+
+		if (best <= 1.0e-8f)
+			return 0;
+
+		if (pivot != col)
+		{
+			for (int c = 0; c < 8; ++c)
+			{
+				const float tmp = a[col][c];
+				a[col][c] = a[pivot][c];
+				a[pivot][c] = tmp;
+			}
+		}
+
+		const float invPivot = 1.0f / a[col][col];
+		for (int c = 0; c < 8; ++c)
+			a[col][c] *= invPivot;
+
+		for (int r = 0; r < 4; ++r)
+		{
+			if (r == col)
+				continue;
+
+			const float f = a[r][col];
+			if (f == 0.0f)
+				continue;
+
+			for (int c = 0; c < 8; ++c)
+				a[r][c] -= f * a[col][c];
+		}
+	}
+
+	for (int r = 0; r < 4; ++r)
+	{
+		for (int c = 0; c < 4; ++c)
+			out[r * 4 + c] = a[r][4 + c];
+	}
+
+	return 1;
+}
+
+
+static DXGI_FORMAT glRaytracingGetSrvFormatForDepth(DXGI_FORMAT fmt)
+{
+	switch (fmt)
+	{
+	case DXGI_FORMAT_D32_FLOAT:         return DXGI_FORMAT_R32_FLOAT;
+	case DXGI_FORMAT_D24_UNORM_S8_UINT: return DXGI_FORMAT_R24_UNORM_X8_TYPELESS;
+	case DXGI_FORMAT_D16_UNORM:         return DXGI_FORMAT_R16_UNORM;
+	default:                            return fmt;
+	}
+}
+
+struct glRaytracingBuffer_t
+{
+	ComPtr<ID3D12Resource> resource;
+	UINT64 size;
+	D3D12_GPU_VIRTUAL_ADDRESS gpuVA;
+
+	glRaytracingBuffer_t()
+	{
+		size = 0;
+		gpuVA = 0;
+	}
+};
+
+static glRaytracingBuffer_t glRaytracingCreateBuffer(
+	ID3D12Device* device,
+	UINT64 size,
+	D3D12_HEAP_TYPE heapType,
+	D3D12_RESOURCE_STATES initialState,
+	D3D12_RESOURCE_FLAGS flags)
+{
+	glRaytracingBuffer_t out;
+
+	D3D12_HEAP_PROPERTIES hp = {};
+	hp.Type = heapType;
+
+	D3D12_RESOURCE_DESC rd = {};
+	rd.Dimension = D3D12_RESOURCE_DIMENSION_BUFFER;
+	rd.Width = size;
+	rd.Height = 1;
+	rd.DepthOrArraySize = 1;
+	rd.MipLevels = 1;
+	rd.Format = DXGI_FORMAT_UNKNOWN;
+	rd.SampleDesc.Count = 1;
+	rd.Layout = D3D12_TEXTURE_LAYOUT_ROW_MAJOR;
+	rd.Flags = flags;
+
+	HRESULT hr = device->CreateCommittedResource(
+		&hp,
+		D3D12_HEAP_FLAG_NONE,
+		&rd,
+		initialState,
+		nullptr,
+		IID_PPV_ARGS(&out.resource));
+
+	if (FAILED(hr))
+	{
+		glRaytracingFatal("CreateCommittedResource failed 0x%08X", (unsigned)hr);
+		return out;
+	}
+
+	out.size = size;
+	out.gpuVA = out.resource->GetGPUVirtualAddress();
+	return out;
+}
+
+struct glRaytracingTexture_t
+{
+	ComPtr<ID3D12Resource> resource;
+	UINT width;
+	UINT height;
+	DXGI_FORMAT format;
+	D3D12_RESOURCE_STATES state;
+
+	glRaytracingTexture_t()
+	{
+		width = 0;
+		height = 0;
+		format = DXGI_FORMAT_UNKNOWN;
+		state = D3D12_RESOURCE_STATE_COMMON;
+	}
+};
+
+static glRaytracingTexture_t glRaytracingCreateTexture2D(
+	ID3D12Device* device,
+	UINT width,
+	UINT height,
+	DXGI_FORMAT format,
+	D3D12_RESOURCE_STATES initialState,
+	D3D12_RESOURCE_FLAGS flags)
+{
+	glRaytracingTexture_t out;
+
+	D3D12_HEAP_PROPERTIES hp = {};
+	hp.Type = D3D12_HEAP_TYPE_DEFAULT;
+
+	D3D12_RESOURCE_DESC rd = {};
+	rd.Dimension = D3D12_RESOURCE_DIMENSION_TEXTURE2D;
+	rd.Width = width;
+	rd.Height = height;
+	rd.DepthOrArraySize = 1;
+	rd.MipLevels = 1;
+	rd.Format = format;
+	rd.SampleDesc.Count = 1;
+	rd.Layout = D3D12_TEXTURE_LAYOUT_UNKNOWN;
+	rd.Flags = flags;
+
+	HRESULT hr = device->CreateCommittedResource(
+		&hp,
+		D3D12_HEAP_FLAG_NONE,
+		&rd,
+		initialState,
+		nullptr,
+		IID_PPV_ARGS(&out.resource));
+
+	if (FAILED(hr))
+	{
+		glRaytracingFatal("CreateCommittedResource texture failed 0x%08X", (unsigned)hr);
+		return out;
+	}
+
+	out.width = width;
+	out.height = height;
+	out.format = format;
+	out.state = initialState;
+	return out;
+}
+
+static void glRaytracingMapCopy(ID3D12Resource* res, const void* src, size_t bytes)
+{
+	void* dst = nullptr;
+	HRESULT hr = res->Map(0, nullptr, &dst);
+	if (FAILED(hr))
+	{
+		glRaytracingFatal("Map failed 0x%08X", (unsigned)hr);
+		return;
+	}
+
+	memcpy(dst, src, bytes);
+	res->Unmap(0, nullptr);
+}
+
+static void glRaytracingTransition(
+	ID3D12GraphicsCommandList* cmd,
+	ID3D12Resource* res,
+	D3D12_RESOURCE_STATES before,
+	D3D12_RESOURCE_STATES after)
+{
+	if (!res || before == after)
+		return;
+
+	D3D12_RESOURCE_BARRIER b = {};
+	b.Type = D3D12_RESOURCE_BARRIER_TYPE_TRANSITION;
+	b.Transition.pResource = res;
+	b.Transition.StateBefore = before;
+	b.Transition.StateAfter = after;
+	b.Transition.Subresource = D3D12_RESOURCE_BARRIER_ALL_SUBRESOURCES;
+	cmd->ResourceBarrier(1, &b);
+}
+
+static D3D12_CPU_DESCRIPTOR_HANDLE glRaytracingOffsetCpu(D3D12_CPU_DESCRIPTOR_HANDLE h, UINT stride, UINT idx)
+{
+	h.ptr += UINT64(stride) * UINT64(idx);
+	return h;
+}
+
+static D3D12_GPU_DESCRIPTOR_HANDLE glRaytracingOffsetGpu(D3D12_GPU_DESCRIPTOR_HANDLE h, UINT stride, UINT idx)
+{
+	h.ptr += UINT64(stride) * UINT64(idx);
+	return h;
+}
+
+// ============================================================
+// Shared command context
+// ============================================================
+
+#ifndef GL_RAYTRACING_CMD_RING_SIZE
+#define GL_RAYTRACING_CMD_RING_SIZE 4
+#endif
+
+#if GL_RAYTRACING_CMD_RING_SIZE < 2
+#error GL_RAYTRACING_CMD_RING_SIZE must be at least 2
+#endif
+
+#ifndef GL_RAYTRACING_FORCE_CPU_SYNC
+#define GL_RAYTRACING_FORCE_CPU_SYNC 0
+#endif
+
+struct glRaytracingCmdContext_t
+{
+	ComPtr<ID3D12Device5> device;
+	ComPtr<ID3D12CommandQueue> queue;
+
+	// Active command allocator/list for the command currently being recorded.
+	// The ring below avoids the old every-frame CPU/GPU fence wait.
+	ComPtr<ID3D12CommandAllocator> cmdAlloc;
+	ComPtr<ID3D12GraphicsCommandList4> cmdList;
+	UINT64 cmdLastFenceValue;
+	ComPtr<ID3D12CommandAllocator> cmdAllocRing[GL_RAYTRACING_CMD_RING_SIZE];
+	ComPtr<ID3D12GraphicsCommandList4> cmdListRing[GL_RAYTRACING_CMD_RING_SIZE];
+	UINT64 cmdFenceValueRing[GL_RAYTRACING_CMD_RING_SIZE];
+	UINT cmdRingIndex;
+	UINT cmdCurrentSlot;
+
+	ComPtr<ID3D12CommandAllocator> blasCmdAlloc;
+	ComPtr<ID3D12GraphicsCommandList4> blasCmdList;
+	UINT64 blasLastFenceValue;
+	ComPtr<ID3D12CommandAllocator> blasCmdAllocRing[GL_RAYTRACING_CMD_RING_SIZE];
+	ComPtr<ID3D12GraphicsCommandList4> blasCmdListRing[GL_RAYTRACING_CMD_RING_SIZE];
+	UINT64 blasFenceValueRing[GL_RAYTRACING_CMD_RING_SIZE];
+	UINT blasRingIndex;
+	UINT blasCurrentSlot;
+
+	ComPtr<ID3D12CommandAllocator> tlasCmdAlloc;
+	ComPtr<ID3D12GraphicsCommandList4> tlasCmdList;
+	UINT64 tlasLastFenceValue;
+	ComPtr<ID3D12CommandAllocator> tlasCmdAllocRing[GL_RAYTRACING_CMD_RING_SIZE];
+	ComPtr<ID3D12GraphicsCommandList4> tlasCmdListRing[GL_RAYTRACING_CMD_RING_SIZE];
+	UINT64 tlasFenceValueRing[GL_RAYTRACING_CMD_RING_SIZE];
+	UINT tlasRingIndex;
+	UINT tlasCurrentSlot;
+
+	ComPtr<ID3D12Fence> fence;
+	HANDLE fenceEvent;
+	UINT64 nextFenceValue;
+	ComPtr<ID3D12QueryHeap> pathTracingTimestampHeap;
+	glRaytracingBuffer_t pathTracingTimestampReadback;
+	UINT64 pathTracingTimestampFrequency;
+	UINT64 pathTracingTimestampFenceRing[GL_RAYTRACING_CMD_RING_SIZE];
+	bool initialized;
+
+	glRaytracingCmdContext_t()
+	{
+		cmdLastFenceValue = 0;
+		blasLastFenceValue = 0;
+		tlasLastFenceValue = 0;
+		cmdRingIndex = GL_RAYTRACING_CMD_RING_SIZE - 1;
+		blasRingIndex = GL_RAYTRACING_CMD_RING_SIZE - 1;
+		tlasRingIndex = GL_RAYTRACING_CMD_RING_SIZE - 1;
+		cmdCurrentSlot = 0;
+		blasCurrentSlot = 0;
+		tlasCurrentSlot = 0;
+		for (UINT i = 0; i < GL_RAYTRACING_CMD_RING_SIZE; ++i)
+		{
+			cmdFenceValueRing[i] = 0;
+			blasFenceValueRing[i] = 0;
+			tlasFenceValueRing[i] = 0;
+			pathTracingTimestampFenceRing[i] = 0;
+		}
+		fenceEvent = nullptr;
+		nextFenceValue = 0;
+		pathTracingTimestampFrequency = 0;
+		initialized = false;
+	}
+};
+
+static glRaytracingCmdContext_t g_glRaytracingCmd;
+static std::mutex g_glRaytracingMutex;
+
+static void glRaytracingWaitFenceValue(UINT64 value)
+{
+	if (!value || !g_glRaytracingCmd.fence)
+		return;
+
+	if (g_glRaytracingCmd.fence->GetCompletedValue() >= value)
+		return;
+
+	g_glRaytracingCmd.fence->SetEventOnCompletion(value, g_glRaytracingCmd.fenceEvent);
+	WaitForSingleObject(g_glRaytracingCmd.fenceEvent, INFINITE);
+}
+
+static UINT64 glRaytracingSignalQueue(void)
+{
+	if (!g_glRaytracingCmd.queue || !g_glRaytracingCmd.fence)
+		return 0;
+
+	const UINT64 value = ++g_glRaytracingCmd.nextFenceValue;
+	g_glRaytracingCmd.queue->Signal(g_glRaytracingCmd.fence.Get(), value);
+	return value;
+}
+
+static void glRaytracingWaitIdle(void)
+{
+	const UINT64 value = glRaytracingSignalQueue();
+	glRaytracingWaitFenceValue(value);
+}
+
+static void glRaytracingPollPathTracingTimestamp(UINT slot)
+{
+	if (!g_glRaytracingCmd.pathTracingTimestampReadback.resource ||
+		!g_glRaytracingCmd.pathTracingTimestampFrequency ||
+		slot >= GL_RAYTRACING_CMD_RING_SIZE)
+	{
+		return;
+	}
+
+	const UINT64 fenceValue = g_glRaytracingCmd.pathTracingTimestampFenceRing[slot];
+	if (!fenceValue || !g_glRaytracingCmd.fence || g_glRaytracingCmd.fence->GetCompletedValue() < fenceValue)
+		return;
+
+	const UINT64 offset = sizeof(UINT64) * 2ull * slot;
+	D3D12_RANGE readRange = { offset, offset + sizeof(UINT64) * 2ull };
+	UINT64* timestamps = nullptr;
+	if (SUCCEEDED(g_glRaytracingCmd.pathTracingTimestampReadback.resource->Map(0, &readRange, reinterpret_cast<void**>(&timestamps))) && timestamps != nullptr)
+	{
+		const UINT64 begin = timestamps[slot * 2 + 0];
+		const UINT64 end = timestamps[slot * 2 + 1];
+		if (end >= begin)
+		{
+			com_pathTracingGpuMsec = (float)((double)(end - begin) * 1000.0 / (double)g_glRaytracingCmd.pathTracingTimestampFrequency);
+		}
+
+		D3D12_RANGE writeRange = { 0, 0 };
+		g_glRaytracingCmd.pathTracingTimestampReadback.resource->Unmap(0, &writeRange);
+	}
+	g_glRaytracingCmd.pathTracingTimestampFenceRing[slot] = 0;
+}
+
+static int glRaytracingCreatePathTracingTimestamps(void)
+{
+	D3D12_QUERY_HEAP_DESC qh = {};
+	qh.Type = D3D12_QUERY_HEAP_TYPE_TIMESTAMP;
+	qh.NumDescriptors = GL_RAYTRACING_CMD_RING_SIZE * 2;
+	if (FAILED(g_glRaytracingCmd.device->CreateQueryHeap(&qh, IID_PPV_ARGS(&g_glRaytracingCmd.pathTracingTimestampHeap))))
+		return 0;
+
+	g_glRaytracingCmd.pathTracingTimestampReadback = glRaytracingCreateBuffer(
+		g_glRaytracingCmd.device.Get(),
+		sizeof(UINT64) * GL_RAYTRACING_CMD_RING_SIZE * 2ull,
+		D3D12_HEAP_TYPE_READBACK,
+		D3D12_RESOURCE_STATE_COPY_DEST,
+		D3D12_RESOURCE_FLAG_NONE);
+	if (!g_glRaytracingCmd.pathTracingTimestampReadback.resource)
+		return 0;
+
+	g_glRaytracingCmd.pathTracingTimestampFrequency = 0;
+	if (FAILED(g_glRaytracingCmd.queue->GetTimestampFrequency(&g_glRaytracingCmd.pathTracingTimestampFrequency)) ||
+		g_glRaytracingCmd.pathTracingTimestampFrequency == 0)
+	{
+		g_glRaytracingCmd.pathTracingTimestampHeap.Reset();
+		g_glRaytracingCmd.pathTracingTimestampReadback = glRaytracingBuffer_t();
+		return 0;
+	}
+
+	return 1;
+}
+
+static int glRaytracingCreateDirectCommandListPair(
+	ID3D12Device5* device,
+	ComPtr<ID3D12CommandAllocator>& allocator,
+	ComPtr<ID3D12GraphicsCommandList4>& list)
+{
+	GLR_CHECK(device->CreateCommandAllocator(
+		D3D12_COMMAND_LIST_TYPE_DIRECT,
+		IID_PPV_ARGS(&allocator)));
+
+	GLR_CHECK(device->CreateCommandList(
+		0,
+		D3D12_COMMAND_LIST_TYPE_DIRECT,
+		allocator.Get(),
+		nullptr,
+		IID_PPV_ARGS(&list)));
+
+	GLR_CHECK(list->Close());
+	return 1;
+}
+
+static int glRaytracingInitCmdContext(void)
+{
+	ID3D12Device* baseDevice = QD3D12_GetDevice();
+	ID3D12CommandQueue* baseQueue = QD3D12_GetQueue();
+
+	if (g_glRaytracingCmd.initialized)
+	{
+		if (!baseDevice || !baseQueue)
+		{
+			glRaytracingFatal("glRaytracingInitCmdContext: missing device or queue");
+			return 0;
+		}
+
+		ComPtr<ID3D12Device5> currentDevice;
+		HRESULT hr = baseDevice->QueryInterface(IID_PPV_ARGS(&currentDevice));
+		if (FAILED(hr) || currentDevice.Get() != g_glRaytracingCmd.device.Get() || baseQueue != g_glRaytracingCmd.queue.Get())
+		{
+			glRaytracingFatal("glRaytracingInitCmdContext: D3D12 device/queue changed. DXR state is device-local; create/use all windows with the same D3D12 device and queue, or fully shut down raytracing before switching devices.");
+			return 0;
+		}
+
+		return 1;
+	}
+
+	if (!baseDevice || !baseQueue)
+	{
+		glRaytracingFatal("glRaytracingInitCmdContext: missing device or queue");
+		return 0;
+	}
+
+	GLR_CHECK(baseDevice->QueryInterface(IID_PPV_ARGS(&g_glRaytracingCmd.device)));
+	g_glRaytracingCmd.queue = baseQueue;
+
+	for (UINT i = 0; i < GL_RAYTRACING_CMD_RING_SIZE; ++i)
+	{
+		if (!glRaytracingCreateDirectCommandListPair(
+			g_glRaytracingCmd.device.Get(),
+			g_glRaytracingCmd.cmdAllocRing[i],
+			g_glRaytracingCmd.cmdListRing[i]))
+		{
+			return 0;
+		}
+
+		if (!glRaytracingCreateDirectCommandListPair(
+			g_glRaytracingCmd.device.Get(),
+			g_glRaytracingCmd.blasCmdAllocRing[i],
+			g_glRaytracingCmd.blasCmdListRing[i]))
+		{
+			return 0;
+		}
+
+		if (!glRaytracingCreateDirectCommandListPair(
+			g_glRaytracingCmd.device.Get(),
+			g_glRaytracingCmd.tlasCmdAllocRing[i],
+			g_glRaytracingCmd.tlasCmdListRing[i]))
+		{
+			return 0;
+		}
+	}
+
+	g_glRaytracingCmd.cmdAlloc = g_glRaytracingCmd.cmdAllocRing[0];
+	g_glRaytracingCmd.cmdList = g_glRaytracingCmd.cmdListRing[0];
+	g_glRaytracingCmd.blasCmdAlloc = g_glRaytracingCmd.blasCmdAllocRing[0];
+	g_glRaytracingCmd.blasCmdList = g_glRaytracingCmd.blasCmdListRing[0];
+	g_glRaytracingCmd.tlasCmdAlloc = g_glRaytracingCmd.tlasCmdAllocRing[0];
+	g_glRaytracingCmd.tlasCmdList = g_glRaytracingCmd.tlasCmdListRing[0];
+
+	GLR_CHECK(g_glRaytracingCmd.device->CreateFence(
+		0,
+		D3D12_FENCE_FLAG_NONE,
+		IID_PPV_ARGS(&g_glRaytracingCmd.fence)));
+
+	g_glRaytracingCmd.fenceEvent = CreateEventA(nullptr, FALSE, FALSE, nullptr);
+	if (!g_glRaytracingCmd.fenceEvent)
+	{
+		glRaytracingFatal("CreateEventA failed");
+		return 0;
+	}
+
+	if (!glRaytracingCreatePathTracingTimestamps())
+	{
+		glRaytracingLog("path tracing timestamp queries unavailable");
+	}
+
+	g_glRaytracingCmd.initialized = true;
+	return 1;
+}
+
+static void glRaytracingShutdownCmdContext(void)
+{
+	if (!g_glRaytracingCmd.initialized)
+		return;
+
+	glRaytracingWaitIdle();
+
+	if (g_glRaytracingCmd.fenceEvent)
+	{
+		CloseHandle(g_glRaytracingCmd.fenceEvent);
+		g_glRaytracingCmd.fenceEvent = nullptr;
+	}
+
+	g_glRaytracingCmd = glRaytracingCmdContext_t();
+}
+
+static int glRaytracingBeginCmd(void)
+{
+	const UINT slot = (g_glRaytracingCmd.cmdRingIndex + 1u) % GL_RAYTRACING_CMD_RING_SIZE;
+	glRaytracingWaitFenceValue(g_glRaytracingCmd.cmdFenceValueRing[slot]);
+	glRaytracingPollPathTracingTimestamp(slot);
+
+	g_glRaytracingCmd.cmdRingIndex = slot;
+	g_glRaytracingCmd.cmdCurrentSlot = slot;
+	g_glRaytracingCmd.cmdAlloc = g_glRaytracingCmd.cmdAllocRing[slot];
+	g_glRaytracingCmd.cmdList = g_glRaytracingCmd.cmdListRing[slot];
+
+	GLR_CHECK(g_glRaytracingCmd.cmdAlloc->Reset());
+	GLR_CHECK(g_glRaytracingCmd.cmdList->Reset(g_glRaytracingCmd.cmdAlloc.Get(), nullptr));
+	return 1;
+}
+
+static int glRaytracingEndCmd(void)
+{
+	GLR_CHECK(g_glRaytracingCmd.cmdList->Close());
+
+	ID3D12CommandList* lists[] = { g_glRaytracingCmd.cmdList.Get() };
+	g_glRaytracingCmd.queue->ExecuteCommandLists(1, lists);
+
+	g_glRaytracingCmd.cmdLastFenceValue = glRaytracingSignalQueue();
+	g_glRaytracingCmd.cmdFenceValueRing[g_glRaytracingCmd.cmdCurrentSlot] = g_glRaytracingCmd.cmdLastFenceValue;
+
+#if GL_RAYTRACING_FORCE_CPU_SYNC
+	glRaytracingWaitFenceValue(g_glRaytracingCmd.cmdLastFenceValue);
+#endif
+
+	return 1;
+}
+
+static int glRaytracingBeginBlasCmd(void)
+{
+	const UINT slot = (g_glRaytracingCmd.blasRingIndex + 1u) % GL_RAYTRACING_CMD_RING_SIZE;
+	glRaytracingWaitFenceValue(g_glRaytracingCmd.blasFenceValueRing[slot]);
+
+	g_glRaytracingCmd.blasRingIndex = slot;
+	g_glRaytracingCmd.blasCurrentSlot = slot;
+	g_glRaytracingCmd.blasCmdAlloc = g_glRaytracingCmd.blasCmdAllocRing[slot];
+	g_glRaytracingCmd.blasCmdList = g_glRaytracingCmd.blasCmdListRing[slot];
+
+	GLR_CHECK(g_glRaytracingCmd.blasCmdAlloc->Reset());
+	GLR_CHECK(g_glRaytracingCmd.blasCmdList->Reset(g_glRaytracingCmd.blasCmdAlloc.Get(), nullptr));
+	return 1;
+}
+
+static UINT64 glRaytracingEndBlasCmd(void)
+{
+	GLR_CHECK(g_glRaytracingCmd.blasCmdList->Close());
+
+	ID3D12CommandList* lists[] = { g_glRaytracingCmd.blasCmdList.Get() };
+	g_glRaytracingCmd.queue->ExecuteCommandLists(1, lists);
+
+	g_glRaytracingCmd.blasLastFenceValue = glRaytracingSignalQueue();
+	g_glRaytracingCmd.blasFenceValueRing[g_glRaytracingCmd.blasCurrentSlot] = g_glRaytracingCmd.blasLastFenceValue;
+
+#if GL_RAYTRACING_FORCE_CPU_SYNC
+	glRaytracingWaitFenceValue(g_glRaytracingCmd.blasLastFenceValue);
+#endif
+
+	return g_glRaytracingCmd.blasLastFenceValue;
+}
+
+static int glRaytracingBeginTlasCmd(void)
+{
+	const UINT slot = (g_glRaytracingCmd.tlasRingIndex + 1u) % GL_RAYTRACING_CMD_RING_SIZE;
+	glRaytracingWaitFenceValue(g_glRaytracingCmd.tlasFenceValueRing[slot]);
+
+	g_glRaytracingCmd.tlasRingIndex = slot;
+	g_glRaytracingCmd.tlasCurrentSlot = slot;
+	g_glRaytracingCmd.tlasCmdAlloc = g_glRaytracingCmd.tlasCmdAllocRing[slot];
+	g_glRaytracingCmd.tlasCmdList = g_glRaytracingCmd.tlasCmdListRing[slot];
+
+	GLR_CHECK(g_glRaytracingCmd.tlasCmdAlloc->Reset());
+	GLR_CHECK(g_glRaytracingCmd.tlasCmdList->Reset(g_glRaytracingCmd.tlasCmdAlloc.Get(), nullptr));
+	return 1;
+}
+
+static UINT64 glRaytracingEndTlasCmd(void)
+{
+	GLR_CHECK(g_glRaytracingCmd.tlasCmdList->Close());
+
+	ID3D12CommandList* lists[] = { g_glRaytracingCmd.tlasCmdList.Get() };
+	g_glRaytracingCmd.queue->ExecuteCommandLists(1, lists);
+
+	g_glRaytracingCmd.tlasLastFenceValue = glRaytracingSignalQueue();
+	g_glRaytracingCmd.tlasFenceValueRing[g_glRaytracingCmd.tlasCurrentSlot] = g_glRaytracingCmd.tlasLastFenceValue;
+
+#if GL_RAYTRACING_FORCE_CPU_SYNC
+	glRaytracingWaitFenceValue(g_glRaytracingCmd.tlasLastFenceValue);
+#endif
+
+	return g_glRaytracingCmd.tlasLastFenceValue;
+}
+
+
+// ============================================================
+// Scene builder state
+// ============================================================
+
+#ifndef GL_RAYTRACING_MAX_RENDER_WORLDS
+#define GL_RAYTRACING_MAX_RENDER_WORLDS 24
+#endif
+
+#ifndef GL_RAYTRACING_SCENE_HANDLE_T_DEFINED
+typedef uint32_t glRaytracingSceneHandle_t;
+#define GL_RAYTRACING_SCENE_HANDLE_T_DEFINED
+#endif
+
+// Internal material metadata encoded into D3D12's 24-bit shader-visible
+// InstanceID. Lower 16 bits remain caller/user ID; bits 16-23 are material flags.
+static const uint32_t GL_RAYTRACING_INSTANCE_USER_ID_MASK = 0x0000FFFFu;
+static const uint32_t GL_RAYTRACING_INSTANCE_MATERIAL_SHIFT = 16u;
+static const uint32_t GL_RAYTRACING_INSTANCE_MATERIAL_MASK = 0x000000FFu;
+
+struct glRaytracingMeshRecord_t
+{
+	uint32_t handle;
+	int      alive;
+
+	glRaytracingMeshDesc_t descCpu;
+
+	std::vector<glRaytracingVertex_t> verticesCpu;
+	std::vector<uint32_t>             indicesCpu;
+
+	glRaytracingBuffer_t vertexBuffer;
+	glRaytracingBuffer_t indexBuffer;
+
+	glRaytracingBuffer_t blasScratch;
+	glRaytracingBuffer_t blasResult[2];
+
+	UINT64 blasScratchSize;
+	UINT64 blasResultSize;
+
+	int blasBuilt;
+	int dirty;
+	UINT64 blasBuildFenceValue;
+	int currentBlasIndex;
+	uint32_t materialFlags;
+
+	glRaytracingMeshRecord_t()
+	{
+		handle = 0;
+		alive = 0;
+		memset(&descCpu, 0, sizeof(descCpu));
+		blasScratchSize = 0;
+		blasResultSize = 0;
+		blasBuilt = 0;
+		dirty = 0;
+		blasBuildFenceValue = 0;
+		currentBlasIndex = 0;
+		materialFlags = 0;
+	}
+};
+
+struct glRaytracingInstanceRecord_t
+{
+	uint32_t handle;
+	int      alive;
+	glRaytracingInstanceDesc_t descCpu;
+	int dirty;
+	int cachedActive;
+	D3D12_GPU_VIRTUAL_ADDRESS cachedBlasGpuVA;
+	D3D12_RAYTRACING_INSTANCE_DESC cachedDescCpu;
+
+	glRaytracingInstanceRecord_t()
+	{
+		handle = 0;
+		alive = 0;
+		memset(&descCpu, 0, sizeof(descCpu));
+		dirty = 0;
+		cachedActive = 0;
+		cachedBlasGpuVA = 0;
+		memset(&cachedDescCpu, 0, sizeof(cachedDescCpu));
+	}
+};
+
+struct glRaytracingSceneUploadBuffer_t
+{
+	glRaytracingBuffer_t buffer;
+	UINT64 capacityBytes;
+	D3D12_RAYTRACING_INSTANCE_DESC* mapped;
+
+	glRaytracingSceneUploadBuffer_t()
+	{
+		capacityBytes = 0;
+		mapped = nullptr;
+	}
+};
+
+// One render world owns exactly one TLAS pair and its own list of geometry
+// instances. Mesh/BLAS resources stay shared across all worlds.
+struct glRaytracingRenderWorld_t
+{
+	uint32_t handle;
+	int alive;
+
+	std::vector<glRaytracingInstanceRecord_t> instances;
+	std::vector<int> activeInstanceIndices;
+	std::vector<D3D12_RAYTRACING_INSTANCE_DESC> cpuInstanceDescs;
+	std::vector<int> instanceHandleToIndex;
+
+	uint32_t nextInstanceHandle;
+
+	glRaytracingSceneUploadBuffer_t instanceDescUpload[2];
+	UINT64 instanceDescUploadFenceValue[2];
+	glRaytracingBuffer_t tlasScratch;
+	glRaytracingBuffer_t tlasResult[2];
+
+	UINT64 tlasScratchSize;
+	UINT64 tlasResultSize;
+
+	UINT activeInstanceCount;
+	UINT builtInstanceCount;
+
+	int tlasBuilt;
+	int tlasNeedsRebuild;
+	int tlasNeedsUpdate;
+	int currentTLASIndex;
+
+	glRaytracingRenderWorld_t()
+	{
+		handle = 0;
+		alive = 0;
+		nextInstanceHandle = 1;
+		instanceDescUploadFenceValue[0] = 0;
+		instanceDescUploadFenceValue[1] = 0;
+		tlasScratchSize = 0;
+		tlasResultSize = 0;
+		activeInstanceCount = 0;
+		builtInstanceCount = 0;
+		tlasBuilt = 0;
+		tlasNeedsRebuild = 1;
+		tlasNeedsUpdate = 1;
+		currentTLASIndex = 0;
+	}
+};
+
+struct glRaytracingSceneState_t
+{
+	std::vector<glRaytracingMeshRecord_t> meshes;
+	std::vector<int> meshHandleToIndex;
+
+	uint32_t nextMeshHandle;
+
+	glRaytracingRenderWorld_t worlds[GL_RAYTRACING_MAX_RENDER_WORLDS];
+
+	int initialized;
+
+	glRaytracingSceneState_t()
+	{
+		nextMeshHandle = 1;
+		initialized = 0;
+	}
+};
+
+static glRaytracingSceneState_t g_glRaytracingScene;
+
+void glRaytracingClear(void);
+static void glRaytracingLightingResetDenoiseHistory(void);
+
+static void glRaytracingReleaseWorldResources(glRaytracingRenderWorld_t* world)
+{
+	if (!world)
+		return;
+
+	for (int i = 0; i < 2; ++i)
+	{
+		if (world->instanceDescUpload[i].buffer.resource && world->instanceDescUpload[i].mapped)
+			world->instanceDescUpload[i].buffer.resource->Unmap(0, nullptr);
+
+		world->instanceDescUpload[i] = glRaytracingSceneUploadBuffer_t();
+		world->tlasResult[i].resource.Reset();
+	}
+
+	world->instanceDescUploadFenceValue[0] = 0;
+	world->instanceDescUploadFenceValue[1] = 0;
+	world->tlasScratch.resource.Reset();
+	world->tlasScratchSize = 0;
+	world->tlasResultSize = 0;
+}
+
+static void glRaytracingResetWorldSlot(glRaytracingRenderWorld_t* world, uint32_t handle, int alive)
+{
+	if (!world)
+		return;
+
+	glRaytracingReleaseWorldResources(world);
+	*world = glRaytracingRenderWorld_t();
+	world->handle = handle;
+	world->alive = alive ? 1 : 0;
+	world->nextInstanceHandle = 1;
+}
+
+static int glRaytracingWorldHandleToSlot(glRaytracingSceneHandle_t worldHandle)
+{
+	if (worldHandle == 0 || worldHandle > GL_RAYTRACING_MAX_RENDER_WORLDS)
+		return -1;
+	return (int)(worldHandle - 1);
+}
+
+static glRaytracingRenderWorld_t* glRaytracingFindWorld(glRaytracingSceneHandle_t worldHandle)
+{
+	const int slot = glRaytracingWorldHandleToSlot(worldHandle);
+	if (slot < 0)
+		return nullptr;
+
+	glRaytracingRenderWorld_t& world = g_glRaytracingScene.worlds[slot];
+	if (!world.alive || world.handle != worldHandle)
+		return nullptr;
+
+	return &world;
+}
+
+static const glRaytracingRenderWorld_t* glRaytracingFindWorldConst(glRaytracingSceneHandle_t worldHandle)
+{
+	const int slot = glRaytracingWorldHandleToSlot(worldHandle);
+	if (slot < 0)
+		return nullptr;
+
+	const glRaytracingRenderWorld_t& world = g_glRaytracingScene.worlds[slot];
+	if (!world.alive || world.handle != worldHandle)
+		return nullptr;
+
+	return &world;
+}
+
+static void glRaytracingClearWorldContents(glRaytracingRenderWorld_t* world)
+{
+	if (!world)
+		return;
+
+	const uint32_t handle = world->handle;
+	const int alive = world->alive;
+
+	glRaytracingReleaseWorldResources(world);
+
+	world->instances.clear();
+	world->activeInstanceIndices.clear();
+	world->cpuInstanceDescs.clear();
+	world->instanceHandleToIndex.clear();
+
+	world->handle = handle;
+	world->alive = alive;
+	world->nextInstanceHandle = 1;
+	world->instanceDescUploadFenceValue[0] = 0;
+	world->instanceDescUploadFenceValue[1] = 0;
+	world->tlasScratchSize = 0;
+	world->tlasResultSize = 0;
+	world->activeInstanceCount = 0;
+	world->builtInstanceCount = 0;
+	world->tlasBuilt = 0;
+	world->tlasNeedsRebuild = 1;
+	world->tlasNeedsUpdate = 1;
+	world->currentTLASIndex = 0;
+}
+
+static void glRaytracingClearAllSceneStateInternal(void)
+{
+	for (int i = 0; i < GL_RAYTRACING_MAX_RENDER_WORLDS; ++i)
+		glRaytracingReleaseWorldResources(&g_glRaytracingScene.worlds[i]);
+
+	const int wasInitialized = g_glRaytracingScene.initialized;
+	g_glRaytracingScene = glRaytracingSceneState_t();
+	g_glRaytracingScene.initialized = wasInitialized;
+}
+
+static void glRaytracingMarkWorldNeedsRebuild(glRaytracingRenderWorld_t* world)
+{
+	if (!world || !world->alive)
+		return;
+
+	world->tlasNeedsRebuild = 1;
+	world->tlasNeedsUpdate = 0;
+	glRaytracingLightingResetDenoiseHistory();
+}
+
+static void glRaytracingMarkWorldNeedsUpdate(glRaytracingRenderWorld_t* world)
+{
+	if (!world || !world->alive)
+		return;
+
+	if (!world->tlasNeedsRebuild)
+		world->tlasNeedsUpdate = 1;
+	glRaytracingLightingResetDenoiseHistory();
+}
+
+static void glRaytracingMarkAllWorldsNeedRebuild(void)
+{
+	for (int i = 0; i < GL_RAYTRACING_MAX_RENDER_WORLDS; ++i)
+	{
+		if (g_glRaytracingScene.worlds[i].alive)
+			glRaytracingMarkWorldNeedsRebuild(&g_glRaytracingScene.worlds[i]);
+	}
+
+	glRaytracingLightingResetDenoiseHistory();
+}
+
+static uint32_t glRaytracingCountAliveInstances(const glRaytracingRenderWorld_t* world)
+{
+	if (!world)
+		return 0;
+
+	uint32_t count = 0;
+	for (size_t i = 0; i < world->instances.size(); ++i)
+	{
+		if (world->instances[i].alive)
+			++count;
+	}
+	return count;
+}
+
+static void glRaytracingEnsureMeshHandleTable(uint32_t handle)
+{
+	if (handle >= g_glRaytracingScene.meshHandleToIndex.size())
+		g_glRaytracingScene.meshHandleToIndex.resize((size_t)handle + 1, -1);
+}
+
+static void glRaytracingEnsureInstanceHandleTable(glRaytracingRenderWorld_t* world, uint32_t handle)
+{
+	if (!world)
+		return;
+
+	if (handle >= world->instanceHandleToIndex.size())
+		world->instanceHandleToIndex.resize((size_t)handle + 1, -1);
+}
+
+static glRaytracingBuffer_t* glRaytracingGetMeshCurrentBLAS(glRaytracingMeshRecord_t* mesh)
+{
+	if (!mesh)
+		return nullptr;
+	return &mesh->blasResult[mesh->currentBlasIndex & 1];
+}
+
+static const glRaytracingBuffer_t* glRaytracingGetMeshCurrentBLASConst(const glRaytracingMeshRecord_t* mesh)
+{
+	if (!mesh)
+		return nullptr;
+	return &mesh->blasResult[mesh->currentBlasIndex & 1];
+}
+
+static int glRaytracingGetInactiveTLASIndex(const glRaytracingRenderWorld_t* world)
+{
+	if (!world)
+		return 0;
+	return world->currentTLASIndex ^ 1;
+}
+
+static glRaytracingSceneUploadBuffer_t* glRaytracingGetBuildInstanceUpload(glRaytracingRenderWorld_t* world)
+{
+	return &world->instanceDescUpload[glRaytracingGetInactiveTLASIndex(world)];
+}
+
+static glRaytracingBuffer_t* glRaytracingGetCurrentTLASBuffer(glRaytracingRenderWorld_t* world)
+{
+	return &world->tlasResult[world->currentTLASIndex & 1];
+}
+
+static const glRaytracingBuffer_t* glRaytracingGetCurrentTLASBufferConst(const glRaytracingRenderWorld_t* world)
+{
+	return &world->tlasResult[world->currentTLASIndex & 1];
+}
+
+static glRaytracingBuffer_t* glRaytracingGetBuildTLASBuffer(glRaytracingRenderWorld_t* world)
+{
+	return &world->tlasResult[glRaytracingGetInactiveTLASIndex(world)];
+}
+
+static int glRaytracingEnsureTLASBuffers(
+	glRaytracingRenderWorld_t* world,
+	const D3D12_BUILD_RAYTRACING_ACCELERATION_STRUCTURE_INPUTS* inputs)
+{
+	if (!world)
+		return 0;
+
+	D3D12_RAYTRACING_ACCELERATION_STRUCTURE_PREBUILD_INFO prebuild = {};
+	g_glRaytracingCmd.device->GetRaytracingAccelerationStructurePrebuildInfo(inputs, &prebuild);
+
+	if (prebuild.ResultDataMaxSizeInBytes == 0)
+	{
+		glRaytracingFatal("TLAS prebuild size is zero");
+		return 0;
+	}
+
+	const UINT64 requiredScratch = glRaytracingAlignUp(
+		prebuild.ScratchDataSizeInBytes,
+		D3D12_RAYTRACING_ACCELERATION_STRUCTURE_BYTE_ALIGNMENT);
+
+	const UINT64 requiredResult = glRaytracingAlignUp(
+		prebuild.ResultDataMaxSizeInBytes,
+		D3D12_RAYTRACING_ACCELERATION_STRUCTURE_BYTE_ALIGNMENT);
+
+	const bool resizingScratch = world->tlasScratch.resource &&
+		world->tlasScratchSize < requiredScratch;
+	const bool resizingResult = (world->tlasResult[0].resource || world->tlasResult[1].resource) &&
+		world->tlasResultSize < requiredResult;
+	if (resizingScratch || resizingResult)
+	{
+		// Releasing/reallocating a TLAS resource can invalidate an in-flight ray
+		// dispatch that still references the old resource. This resize path is rare,
+		// so prefer correctness over complex deferred destruction.
+		glRaytracingWaitIdle();
+	}
+
+	if (!world->tlasScratch.resource ||
+		world->tlasScratchSize < requiredScratch)
+	{
+		world->tlasScratch.resource.Reset();
+		world->tlasScratch = glRaytracingCreateBuffer(
+			g_glRaytracingCmd.device.Get(),
+			requiredScratch,
+			D3D12_HEAP_TYPE_DEFAULT,
+			D3D12_RESOURCE_STATE_COMMON,
+			D3D12_RESOURCE_FLAG_ALLOW_UNORDERED_ACCESS);
+
+		if (!world->tlasScratch.resource)
+			return 0;
+
+		world->tlasScratchSize = requiredScratch;
+	}
+
+	for (int i = 0; i < 2; ++i)
+	{
+		if (!world->tlasResult[i].resource ||
+			world->tlasResultSize < requiredResult)
+		{
+			world->tlasResult[i].resource.Reset();
+			world->tlasResult[i] = glRaytracingCreateBuffer(
+				g_glRaytracingCmd.device.Get(),
+				requiredResult,
+				D3D12_HEAP_TYPE_DEFAULT,
+				D3D12_RESOURCE_STATE_RAYTRACING_ACCELERATION_STRUCTURE,
+				D3D12_RESOURCE_FLAG_ALLOW_UNORDERED_ACCESS);
+
+			if (!world->tlasResult[i].resource)
+				return 0;
+		}
+	}
+
+	world->tlasResultSize = requiredResult;
+	return 1;
+}
+
+static glRaytracingMeshRecord_t* glRaytracingFindMesh(uint32_t handle)
+{
+	if (handle == 0 || handle >= g_glRaytracingScene.meshHandleToIndex.size())
+		return nullptr;
+
+	const int index = g_glRaytracingScene.meshHandleToIndex[handle];
+	if (index < 0 || (size_t)index >= g_glRaytracingScene.meshes.size())
+		return nullptr;
+
+	glRaytracingMeshRecord_t& mesh = g_glRaytracingScene.meshes[(size_t)index];
+	if (!mesh.alive || mesh.handle != handle)
+		return nullptr;
+
+	return &mesh;
+}
+
+static const glRaytracingMeshRecord_t* glRaytracingFindMeshConst(uint32_t handle)
+{
+	if (handle == 0 || handle >= g_glRaytracingScene.meshHandleToIndex.size())
+		return nullptr;
+
+	const int index = g_glRaytracingScene.meshHandleToIndex[handle];
+	if (index < 0 || (size_t)index >= g_glRaytracingScene.meshes.size())
+		return nullptr;
+
+	const glRaytracingMeshRecord_t& mesh = g_glRaytracingScene.meshes[(size_t)index];
+	if (!mesh.alive || mesh.handle != handle)
+		return nullptr;
+
+	return &mesh;
+}
+
+static glRaytracingInstanceRecord_t* glRaytracingFindInstance(glRaytracingRenderWorld_t* world, uint32_t handle)
+{
+	if (!world || handle == 0 || handle >= world->instanceHandleToIndex.size())
+		return nullptr;
+
+	const int index = world->instanceHandleToIndex[handle];
+	if (index < 0 || (size_t)index >= world->instances.size())
+		return nullptr;
+
+	glRaytracingInstanceRecord_t& inst = world->instances[(size_t)index];
+	if (!inst.alive || inst.handle != handle)
+		return nullptr;
+
+	return &inst;
+}
+
+static const glRaytracingInstanceRecord_t* glRaytracingFindInstanceConst(const glRaytracingRenderWorld_t* world, uint32_t handle)
+{
+	if (!world || handle == 0 || handle >= world->instanceHandleToIndex.size())
+		return nullptr;
+
+	const int index = world->instanceHandleToIndex[handle];
+	if (index < 0 || (size_t)index >= world->instances.size())
+		return nullptr;
+
+	const glRaytracingInstanceRecord_t& inst = world->instances[(size_t)index];
+	if (!inst.alive || inst.handle != handle)
+		return nullptr;
+
+	return &inst;
+}
+
+static int glRaytracingEnsureMeshScratch(glRaytracingMeshRecord_t* mesh, UINT64 requiredScratch)
+{
+	if (!mesh)
+		return 0;
+
+	requiredScratch = glRaytracingAlignUp(requiredScratch, D3D12_RAYTRACING_ACCELERATION_STRUCTURE_BYTE_ALIGNMENT);
+
+	if (!mesh->blasScratch.resource || mesh->blasScratchSize < requiredScratch)
+	{
+		glRaytracingWaitFenceValue(mesh->blasBuildFenceValue);
+		mesh->blasScratch.resource.Reset();
+		mesh->blasScratch = glRaytracingCreateBuffer(
+			g_glRaytracingCmd.device.Get(),
+			requiredScratch,
+			D3D12_HEAP_TYPE_DEFAULT,
+			D3D12_RESOURCE_STATE_COMMON,
+			D3D12_RESOURCE_FLAG_ALLOW_UNORDERED_ACCESS);
+
+		if (!mesh->blasScratch.resource)
+			return 0;
+
+		mesh->blasScratchSize = requiredScratch;
+	}
+
+	return 1;
+}
+
+static int glRaytracingEnsureMeshResultBuffers(glRaytracingMeshRecord_t* mesh, UINT64 requiredResult)
+{
+	if (!mesh)
+		return 0;
+
+	requiredResult = glRaytracingAlignUp(requiredResult, D3D12_RAYTRACING_ACCELERATION_STRUCTURE_BYTE_ALIGNMENT);
+
+	const int resultCount = mesh->descCpu.allowUpdate ? 2 : 1;
+	for (int i = 0; i < resultCount; ++i)
+	{
+		if (!mesh->blasResult[i].resource || mesh->blasResultSize < requiredResult)
+		{
+			glRaytracingWaitFenceValue(mesh->blasBuildFenceValue);
+			mesh->blasResult[i].resource.Reset();
+			mesh->blasResult[i] = glRaytracingCreateBuffer(
+				g_glRaytracingCmd.device.Get(),
+				requiredResult,
+				D3D12_HEAP_TYPE_DEFAULT,
+				D3D12_RESOURCE_STATE_RAYTRACING_ACCELERATION_STRUCTURE,
+				D3D12_RESOURCE_FLAG_ALLOW_UNORDERED_ACCESS);
+
+			if (!mesh->blasResult[i].resource)
+				return 0;
+		}
+	}
+
+	if (!mesh->descCpu.allowUpdate && mesh->blasResult[1].resource)
+	{
+		glRaytracingWaitFenceValue(mesh->blasBuildFenceValue);
+		mesh->blasResult[1].resource.Reset();
+	}
+
+	mesh->blasResultSize = requiredResult;
+	return 1;
+}
+
+static inline void glRaytracingBuildInstanceDesc(
+	D3D12_RAYTRACING_INSTANCE_DESC* outDesc,
+	const glRaytracingInstanceRecord_t& inst,
+	uint32_t meshMaterialFlags,
+	D3D12_GPU_VIRTUAL_ADDRESS blasGpuVA)
+{
+	memcpy(outDesc->Transform, inst.descCpu.transform, sizeof(float) * 12);
+
+	// InstanceID is 24-bit in D3D12_RAYTRACING_INSTANCE_DESC. Preserve the
+	// caller's lower 16 bits, then pack material flags into bits 16-23 so the
+	// any-hit shader can decide whether visibility rays pass through the hit.
+	//
+	// Accept both sources:
+	// - meshMaterialFlags set by glRaytracingSetMeshMaterialFlags()/shim mesh tags
+	// - already-encoded high InstanceID bits for direct low-level callers
+	const uint32_t userInstanceId = inst.descCpu.instanceID & GL_RAYTRACING_INSTANCE_USER_ID_MASK;
+	const uint32_t instanceMaterialFlags =
+		(inst.descCpu.instanceID >> GL_RAYTRACING_INSTANCE_MATERIAL_SHIFT) & GL_RAYTRACING_INSTANCE_MATERIAL_MASK;
+	const uint32_t combinedMaterialFlags =
+		(meshMaterialFlags | instanceMaterialFlags) & GL_RAYTRACING_INSTANCE_MATERIAL_MASK;
+	const uint32_t materialBits = combinedMaterialFlags << GL_RAYTRACING_INSTANCE_MATERIAL_SHIFT;
+	outDesc->InstanceID = userInstanceId | materialBits;
+	outDesc->InstanceMask = (UINT8)(inst.descCpu.mask & 0xFFu);
+	outDesc->InstanceContributionToHitGroupIndex = 0;
+	outDesc->Flags = D3D12_RAYTRACING_INSTANCE_FLAG_NONE;
+	outDesc->AccelerationStructure = blasGpuVA;
+}
+
+static void glRaytracingInvalidateInstanceCache(glRaytracingInstanceRecord_t* inst)
+{
+	if (!inst)
+		return;
+
+	inst->cachedActive = 0;
+	inst->cachedBlasGpuVA = 0;
+	memset(&inst->cachedDescCpu, 0, sizeof(inst->cachedDescCpu));
+}
+
+static int glRaytracingResolveInstanceDesc(
+	glRaytracingInstanceRecord_t* inst,
+	D3D12_RAYTRACING_INSTANCE_DESC* outDesc,
+	D3D12_GPU_VIRTUAL_ADDRESS* outBlasGpuVA)
+{
+	if (!inst || !inst->alive)
+		return 0;
+
+	const glRaytracingMeshRecord_t* mesh = glRaytracingFindMeshConst(inst->descCpu.meshHandle);
+	if (!mesh || !mesh->blasBuilt)
+		return 0;
+
+	const glRaytracingBuffer_t* blas = glRaytracingGetMeshCurrentBLASConst(mesh);
+	if (!blas || !blas->resource || blas->gpuVA == 0)
+		return 0;
+
+	if (outDesc)
+		glRaytracingBuildInstanceDesc(outDesc, *inst, mesh->materialFlags, blas->gpuVA);
+	if (outBlasGpuVA)
+		*outBlasGpuVA = blas->gpuVA;
+	return 1;
+}
+
+static int glRaytracingRebuildActiveInstanceCache(glRaytracingRenderWorld_t* world)
+{
+	if (!world)
+		return 0;
+
+	world->activeInstanceIndices.clear();
+	world->cpuInstanceDescs.clear();
+	world->activeInstanceIndices.reserve(world->instances.size());
+	world->cpuInstanceDescs.reserve(world->instances.size());
+
+	for (size_t i = 0; i < world->instances.size(); ++i)
+	{
+		glRaytracingInstanceRecord_t& inst = world->instances[i];
+		glRaytracingInvalidateInstanceCache(&inst);
+
+		if (!inst.alive)
+			continue;
+
+		D3D12_RAYTRACING_INSTANCE_DESC desc = {};
+		D3D12_GPU_VIRTUAL_ADDRESS blasGpuVA = 0;
+		if (!glRaytracingResolveInstanceDesc(&inst, &desc, &blasGpuVA))
+			continue;
+
+		inst.cachedActive = 1;
+		inst.cachedBlasGpuVA = blasGpuVA;
+		inst.cachedDescCpu = desc;
+		inst.dirty = 0;
+
+		world->activeInstanceIndices.push_back((int)i);
+		world->cpuInstanceDescs.push_back(desc);
+	}
+
+	world->activeInstanceCount = (UINT)world->cpuInstanceDescs.size();
+	return 1;
+}
+
+static int glRaytracingRefreshDirtyInstanceCache(glRaytracingRenderWorld_t* world)
+{
+	if (!world)
+		return 0;
+
+	for (size_t listIndex = 0; listIndex < world->activeInstanceIndices.size(); ++listIndex)
+	{
+		const int instIndex = world->activeInstanceIndices[listIndex];
+		if (instIndex < 0 || (size_t)instIndex >= world->instances.size())
+			return 0;
+
+		glRaytracingInstanceRecord_t& inst = world->instances[(size_t)instIndex];
+		if (!inst.alive)
+			return 0;
+
+		D3D12_RAYTRACING_INSTANCE_DESC desc = {};
+		D3D12_GPU_VIRTUAL_ADDRESS blasGpuVA = 0;
+		if (!glRaytracingResolveInstanceDesc(&inst, &desc, &blasGpuVA))
+			return 0;
+
+		if (inst.dirty || !inst.cachedActive || inst.cachedBlasGpuVA != blasGpuVA)
+		{
+			inst.cachedActive = 1;
+			inst.cachedBlasGpuVA = blasGpuVA;
+			inst.cachedDescCpu = desc;
+			world->cpuInstanceDescs[listIndex] = desc;
+		}
+
+		inst.dirty = 0;
+	}
+
+	world->activeInstanceCount = (UINT)world->cpuInstanceDescs.size();
+	return 1;
+}
+
+static int glRaytracingEnsureSceneUploadBuffer(glRaytracingRenderWorld_t* world, UINT64 requiredBytes);
+
+static int glRaytracingUploadCachedInstanceDescs(glRaytracingRenderWorld_t* world)
+{
+	if (!world)
+		return 0;
+
+	const UINT activeCount = (UINT)world->cpuInstanceDescs.size();
+	const UINT64 instBytes = glRaytracingAlignUp(
+		(UINT64)activeCount * (UINT64)sizeof(D3D12_RAYTRACING_INSTANCE_DESC),
+		D3D12_RAYTRACING_INSTANCE_DESCS_BYTE_ALIGNMENT);
+
+	const int uploadIndex = glRaytracingGetInactiveTLASIndex(world);
+	glRaytracingWaitFenceValue(world->instanceDescUploadFenceValue[uploadIndex]);
+
+	if (!glRaytracingEnsureSceneUploadBuffer(world, instBytes))
+		return 0;
+
+	glRaytracingSceneUploadBuffer_t* upload = glRaytracingGetBuildInstanceUpload(world);
+	if (!upload->mapped)
+		return 0;
+
+	if (activeCount > 0)
+		memcpy(upload->mapped, world->cpuInstanceDescs.data(), (size_t)activeCount * sizeof(D3D12_RAYTRACING_INSTANCE_DESC));
+
+	return 1;
+}
+
+static int glRaytracingUploadMeshBuffers(glRaytracingMeshRecord_t* mesh);
+
+static int glRaytracingBuildDirtyMeshesInternal(void)
+{
+	std::vector<glRaytracingMeshRecord_t*> dirtyMeshes;
+	dirtyMeshes.reserve(g_glRaytracingScene.meshes.size());
+
+	for (size_t i = 0; i < g_glRaytracingScene.meshes.size(); ++i)
+	{
+		glRaytracingMeshRecord_t& mesh = g_glRaytracingScene.meshes[i];
+		if (!mesh.alive)
+			continue;
+
+		if (!mesh.blasBuilt || mesh.dirty)
+			dirtyMeshes.push_back(&mesh);
+	}
+
+	if (dirtyMeshes.empty())
+		return 1;
+
+	struct glRaytracingMeshBuildInfo_t
+	{
+		glRaytracingMeshRecord_t* mesh;
+		D3D12_RAYTRACING_GEOMETRY_DESC geomDesc;
+		D3D12_BUILD_RAYTRACING_ACCELERATION_STRUCTURE_INPUTS inputs;
+		D3D12_BUILD_RAYTRACING_ACCELERATION_STRUCTURE_DESC buildDesc;
+		ID3D12Resource* barrierResource;
+		int newBlasIndex;
+	};
+
+	std::vector<glRaytracingMeshBuildInfo_t> builds;
+	builds.resize(dirtyMeshes.size());
+
+	for (size_t i = 0; i < dirtyMeshes.size(); ++i)
+	{
+		glRaytracingMeshRecord_t* mesh = dirtyMeshes[i];
+		if (!mesh->vertexBuffer.resource || !mesh->indexBuffer.resource)
+		{
+			if (!glRaytracingUploadMeshBuffers(mesh))
+				return 0;
+		}
+
+		glRaytracingMeshBuildInfo_t& info = builds[i];
+		memset(&info, 0, sizeof(info));
+		info.mesh = mesh;
+
+		info.geomDesc.Type = D3D12_RAYTRACING_GEOMETRY_TYPE_TRIANGLES;
+		const bool meshIsGlass = (mesh->materialFlags & GL_RAYTRACING_MATERIAL_FLAG_GLASS) != 0u;
+		info.geomDesc.Flags = (mesh->descCpu.opaque && !meshIsGlass)
+			? D3D12_RAYTRACING_GEOMETRY_FLAG_OPAQUE
+			: D3D12_RAYTRACING_GEOMETRY_FLAG_NONE;
+		info.geomDesc.Triangles.Transform3x4 = 0;
+		info.geomDesc.Triangles.IndexFormat = DXGI_FORMAT_R32_UINT;
+		info.geomDesc.Triangles.VertexFormat = DXGI_FORMAT_R32G32B32_FLOAT;
+		info.geomDesc.Triangles.IndexCount = (UINT)mesh->indicesCpu.size();
+		info.geomDesc.Triangles.VertexCount = (UINT)mesh->verticesCpu.size();
+		info.geomDesc.Triangles.IndexBuffer = mesh->indexBuffer.gpuVA;
+		info.geomDesc.Triangles.VertexBuffer.StartAddress = mesh->vertexBuffer.gpuVA;
+		info.geomDesc.Triangles.VertexBuffer.StrideInBytes = sizeof(glRaytracingVertex_t);
+
+		info.inputs.Type = D3D12_RAYTRACING_ACCELERATION_STRUCTURE_TYPE_BOTTOM_LEVEL;
+		info.inputs.DescsLayout = D3D12_ELEMENTS_LAYOUT_ARRAY;
+		info.inputs.NumDescs = 1;
+		info.inputs.pGeometryDescs = &info.geomDesc;
+		info.inputs.Flags = mesh->descCpu.allowUpdate
+			? (D3D12_RAYTRACING_ACCELERATION_STRUCTURE_BUILD_FLAG_PREFER_FAST_TRACE |
+				D3D12_RAYTRACING_ACCELERATION_STRUCTURE_BUILD_FLAG_ALLOW_UPDATE)
+			: D3D12_RAYTRACING_ACCELERATION_STRUCTURE_BUILD_FLAG_PREFER_FAST_TRACE;
+
+		const bool canUpdateInPlace = (mesh->blasBuilt != 0) && (mesh->descCpu.allowUpdate != 0);
+		if (canUpdateInPlace)
+			info.inputs.Flags |= D3D12_RAYTRACING_ACCELERATION_STRUCTURE_BUILD_FLAG_PERFORM_UPDATE;
+
+		D3D12_RAYTRACING_ACCELERATION_STRUCTURE_PREBUILD_INFO prebuild = {};
+		g_glRaytracingCmd.device->GetRaytracingAccelerationStructurePrebuildInfo(&info.inputs, &prebuild);
+		if (prebuild.ResultDataMaxSizeInBytes == 0)
+		{
+			glRaytracingFatal("BLAS prebuild size is zero");
+			return 0;
+		}
+
+		if (!glRaytracingEnsureMeshScratch(mesh, prebuild.ScratchDataSizeInBytes))
+			return 0;
+		if (!glRaytracingEnsureMeshResultBuffers(mesh, prebuild.ResultDataMaxSizeInBytes))
+			return 0;
+
+		const int oldIndex = mesh->currentBlasIndex & 1;
+		info.newBlasIndex = (mesh->descCpu.allowUpdate && mesh->blasBuilt) ? (oldIndex ^ 1) : oldIndex;
+
+		info.buildDesc.Inputs = info.inputs;
+		info.buildDesc.ScratchAccelerationStructureData = mesh->blasScratch.gpuVA;
+		info.buildDesc.DestAccelerationStructureData = mesh->blasResult[info.newBlasIndex].gpuVA;
+		info.buildDesc.SourceAccelerationStructureData = 0;
+
+		if (canUpdateInPlace)
+			info.buildDesc.SourceAccelerationStructureData = mesh->blasResult[oldIndex].gpuVA;
+
+		info.barrierResource = mesh->blasResult[info.newBlasIndex].resource.Get();
+	}
+
+	if (!glRaytracingBeginBlasCmd())
+		return 0;
+
+	for (size_t i = 0; i < builds.size(); ++i)
+	{
+		g_glRaytracingCmd.blasCmdList->BuildRaytracingAccelerationStructure(&builds[i].buildDesc, 0, nullptr);
+
+		D3D12_RESOURCE_BARRIER uav = {};
+		uav.Type = D3D12_RESOURCE_BARRIER_TYPE_UAV;
+		uav.UAV.pResource = builds[i].barrierResource;
+		g_glRaytracingCmd.blasCmdList->ResourceBarrier(1, &uav);
+	}
+
+	const UINT64 blasFenceValue = glRaytracingEndBlasCmd();
+	if (!blasFenceValue)
+		return 0;
+
+	// Do not block the CPU here. The BLAS build was submitted before any TLAS
+	// build/lighting work that consumes it, and the shared D3D12 queue preserves
+	// that order. Command allocator reuse is protected by the ring fence in
+	// glRaytracingBeginBlasCmd().
+	for (size_t i = 0; i < builds.size(); ++i)
+	{
+		glRaytracingMeshRecord_t* mesh = builds[i].mesh;
+		mesh->currentBlasIndex = builds[i].newBlasIndex;
+		mesh->blasBuildFenceValue = blasFenceValue;
+		mesh->blasBuilt = 1;
+		mesh->dirty = 0;
+	}
+
+	glRaytracingMarkAllWorldsNeedRebuild();
+	return 1;
+}
+
+static int glRaytracingUploadMeshBuffers(glRaytracingMeshRecord_t* mesh)
+{
+	if (!mesh)
+		return 0;
+
+	if (mesh->verticesCpu.empty() || mesh->indicesCpu.empty())
+		return 0;
+
+	const UINT64 vbBytes = UINT64(mesh->verticesCpu.size()) * sizeof(glRaytracingVertex_t);
+	const UINT64 ibBytes = UINT64(mesh->indicesCpu.size()) * sizeof(uint32_t);
+
+	mesh->vertexBuffer = glRaytracingCreateBuffer(
+		g_glRaytracingCmd.device.Get(),
+		vbBytes,
+		D3D12_HEAP_TYPE_UPLOAD,
+		D3D12_RESOURCE_STATE_GENERIC_READ,
+		D3D12_RESOURCE_FLAG_NONE);
+
+	mesh->indexBuffer = glRaytracingCreateBuffer(
+		g_glRaytracingCmd.device.Get(),
+		ibBytes,
+		D3D12_HEAP_TYPE_UPLOAD,
+		D3D12_RESOURCE_STATE_GENERIC_READ,
+		D3D12_RESOURCE_FLAG_NONE);
+
+	if (!mesh->vertexBuffer.resource || !mesh->indexBuffer.resource)
+		return 0;
+
+	glRaytracingMapCopy(mesh->vertexBuffer.resource.Get(), mesh->verticesCpu.data(), (size_t)vbBytes);
+	glRaytracingMapCopy(mesh->indexBuffer.resource.Get(), mesh->indicesCpu.data(), (size_t)ibBytes);
+
+	return 1;
+}
+
+static int glRaytracingBuildMeshInternal(glRaytracingMeshRecord_t* mesh)
+{
+	if (!mesh)
+		return 0;
+
+	const int oldDirty = mesh->dirty;
+	mesh->dirty = 1;
+	const int ok = glRaytracingBuildDirtyMeshesInternal();
+	if (!ok)
+		mesh->dirty = oldDirty;
+	return ok;
+}
+
+static int glRaytracingEnsureSceneUploadBuffer(glRaytracingRenderWorld_t* world, UINT64 requiredBytes)
+{
+	if (!world)
+		return 0;
+
+	glRaytracingSceneUploadBuffer_t* upload = glRaytracingGetBuildInstanceUpload(world);
+
+	if (requiredBytes == 0)
+		requiredBytes = D3D12_RAYTRACING_INSTANCE_DESCS_BYTE_ALIGNMENT;
+
+	requiredBytes = glRaytracingAlignUp(
+		requiredBytes,
+		D3D12_RAYTRACING_INSTANCE_DESCS_BYTE_ALIGNMENT);
+
+	if (upload->buffer.resource &&
+		upload->capacityBytes >= requiredBytes &&
+		upload->mapped)
+	{
+		return 1;
+	}
+
+	if (upload->buffer.resource && upload->mapped)
+		upload->buffer.resource->Unmap(0, nullptr);
+
+	upload->mapped = nullptr;
+	upload->buffer.resource.Reset();
+	upload->capacityBytes = 0;
+
+	upload->buffer = glRaytracingCreateBuffer(
+		g_glRaytracingCmd.device.Get(),
+		requiredBytes,
+		D3D12_HEAP_TYPE_UPLOAD,
+		D3D12_RESOURCE_STATE_GENERIC_READ,
+		D3D12_RESOURCE_FLAG_NONE);
+
+	if (!upload->buffer.resource)
+		return 0;
+
+	void* mapped = nullptr;
+	D3D12_RANGE readRange = {};
+	if (FAILED(upload->buffer.resource->Map(0, &readRange, &mapped)) || !mapped)
+	{
+		upload->buffer.resource.Reset();
+		return 0;
+	}
+
+	upload->mapped = (D3D12_RAYTRACING_INSTANCE_DESC*)mapped;
+	upload->capacityBytes = requiredBytes;
+	return 1;
+}
+
+static int glRaytracingBuildSceneInternal(glRaytracingRenderWorld_t* world)
+{
+	if (!world || !world->alive)
+		return 0;
+
+	UINT aliveCount = 0;
+	int anyDirty = 0;
+	int needsRebuild = world->tlasNeedsRebuild;
+	int needsUpdate = world->tlasNeedsUpdate;
+
+	for (size_t i = 0; i < world->instances.size(); ++i)
+	{
+		const glRaytracingInstanceRecord_t& inst = world->instances[i];
+		if (!inst.alive)
+			continue;
+
+		++aliveCount;
+		if (inst.dirty)
+			anyDirty = 1;
+	}
+
+	if (aliveCount == 0)
+	{
+		world->activeInstanceIndices.clear();
+		world->cpuInstanceDescs.clear();
+		world->activeInstanceCount = 0;
+		world->builtInstanceCount = 0;
+		world->tlasBuilt = 0;
+		world->tlasNeedsRebuild = 0;
+		world->tlasNeedsUpdate = 0;
+		return 1;
+	}
+
+	if (!world->tlasBuilt)
+		needsRebuild = 1;
+
+	if ((UINT)world->activeInstanceIndices.size() != world->builtInstanceCount)
+		needsRebuild = 1;
+
+	if (needsRebuild)
+	{
+		if (!glRaytracingRebuildActiveInstanceCache(world))
+			return 0;
+	}
+	else
+	{
+		if (!needsUpdate && !anyDirty)
+		{
+			world->activeInstanceCount = (UINT)world->cpuInstanceDescs.size();
+			return 1;
+		}
+
+		if (!glRaytracingRefreshDirtyInstanceCache(world))
+		{
+			world->tlasNeedsRebuild = 1;
+			if (!glRaytracingRebuildActiveInstanceCache(world))
+				return 0;
+			needsRebuild = 1;
+		}
+	}
+
+	const UINT activeCount = (UINT)world->cpuInstanceDescs.size();
+	if (activeCount == 0)
+	{
+		world->activeInstanceCount = 0;
+		world->builtInstanceCount = 0;
+		world->tlasBuilt = 0;
+		world->tlasNeedsRebuild = 0;
+		world->tlasNeedsUpdate = 0;
+		return 1;
+	}
+
+	if (!world->tlasBuilt || activeCount != world->builtInstanceCount)
+		needsRebuild = 1;
+
+	if (!glRaytracingUploadCachedInstanceDescs(world))
+		return 0;
+
+	glRaytracingSceneUploadBuffer_t* upload = glRaytracingGetBuildInstanceUpload(world);
+
+	D3D12_BUILD_RAYTRACING_ACCELERATION_STRUCTURE_INPUTS inputs = {};
+	inputs.Type = D3D12_RAYTRACING_ACCELERATION_STRUCTURE_TYPE_TOP_LEVEL;
+	inputs.DescsLayout = D3D12_ELEMENTS_LAYOUT_ARRAY;
+	inputs.NumDescs = activeCount;
+	inputs.InstanceDescs = upload->buffer.gpuVA;
+	inputs.Flags =
+		D3D12_RAYTRACING_ACCELERATION_STRUCTURE_BUILD_FLAG_PREFER_FAST_TRACE |
+		D3D12_RAYTRACING_ACCELERATION_STRUCTURE_BUILD_FLAG_ALLOW_UPDATE;
+
+	if (!glRaytracingEnsureTLASBuffers(world, &inputs))
+		return 0;
+
+	const int buildTLASIndex = glRaytracingGetInactiveTLASIndex(world);
+	glRaytracingBuffer_t* dstTLAS = glRaytracingGetBuildTLASBuffer(world);
+	const glRaytracingBuffer_t* srcTLAS = glRaytracingGetCurrentTLASBufferConst(world);
+
+	// The TLAS build is queued after any pending BLAS builds on the same D3D12
+	// queue, so GPU ordering is sufficient and a CPU wait would stall the frame.
+	if (!glRaytracingBeginTlasCmd())
+		return 0;
+
+	D3D12_BUILD_RAYTRACING_ACCELERATION_STRUCTURE_DESC buildDesc = {};
+	buildDesc.Inputs = inputs;
+	buildDesc.ScratchAccelerationStructureData = world->tlasScratch.gpuVA;
+	buildDesc.DestAccelerationStructureData = dstTLAS->gpuVA;
+	buildDesc.SourceAccelerationStructureData = 0;
+
+	if (!needsRebuild && world->tlasBuilt)
+	{
+		buildDesc.Inputs.Flags |= D3D12_RAYTRACING_ACCELERATION_STRUCTURE_BUILD_FLAG_PERFORM_UPDATE;
+		buildDesc.SourceAccelerationStructureData = srcTLAS->gpuVA;
+	}
+
+	g_glRaytracingCmd.tlasCmdList->BuildRaytracingAccelerationStructure(&buildDesc, 0, nullptr);
+
+	D3D12_RESOURCE_BARRIER uav = {};
+	uav.Type = D3D12_RESOURCE_BARRIER_TYPE_UAV;
+	uav.UAV.pResource = dstTLAS->resource.Get();
+	g_glRaytracingCmd.tlasCmdList->ResourceBarrier(1, &uav);
+
+	const UINT64 tlasFenceValue = glRaytracingEndTlasCmd();
+	if (!tlasFenceValue)
+		return 0;
+
+	// Keep TLAS builds asynchronous. Later ray dispatches are submitted to the
+	// same queue after this command list, so the GPU sees a complete TLAS before
+	// tracing without forcing the CPU to wait every update. The upload buffer is
+	// fence-tagged so the CPU does not overwrite instance descriptors still being
+	// consumed by an in-flight TLAS build.
+	world->instanceDescUploadFenceValue[buildTLASIndex] = tlasFenceValue;
+	world->currentTLASIndex = buildTLASIndex;
+	world->activeInstanceCount = activeCount;
+	world->builtInstanceCount = activeCount;
+	world->tlasBuilt = 1;
+	world->tlasNeedsRebuild = 0;
+	world->tlasNeedsUpdate = 0;
+
+	for (size_t i = 0; i < world->instances.size(); ++i)
+	{
+		if (world->instances[i].alive)
+			world->instances[i].dirty = 0;
+	}
+
+	return 1;
+}
+
+static void glRaytracingInvalidateInstancesForMesh(uint32_t meshHandle, int deleteInstances)
+{
+	for (int w = 0; w < GL_RAYTRACING_MAX_RENDER_WORLDS; ++w)
+	{
+		glRaytracingRenderWorld_t& world = g_glRaytracingScene.worlds[w];
+		if (!world.alive)
+			continue;
+
+		int touched = 0;
+		for (size_t i = 0; i < world.instances.size(); ++i)
+		{
+			glRaytracingInstanceRecord_t& inst = world.instances[i];
+			if (inst.alive && inst.descCpu.meshHandle == meshHandle)
+			{
+				glRaytracingInvalidateInstanceCache(&inst);
+				inst.dirty = 1;
+				touched = 1;
+
+				if (deleteInstances)
+				{
+					inst.alive = 0;
+					if (inst.handle < world.instanceHandleToIndex.size())
+						world.instanceHandleToIndex[inst.handle] = -1;
+				}
+			}
+		}
+
+		if (touched)
+			glRaytracingMarkWorldNeedsRebuild(&world);
+	}
+}
+
+// ============================================================
+// Scene public API
+// ============================================================
+
+int glRaytracingInit(void)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	if (g_glRaytracingScene.initialized)
+		return 1;
+
+	if (!glRaytracingInitCmdContext())
+		return 0;
+
+	g_glRaytracingScene.initialized = 1;
+
+	glRaytracingLog("glRaytracingInit ok");
+	return 1;
+}
+
+void glRaytracingShutdown(void)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	if (!g_glRaytracingScene.initialized)
+		return;
+
+	glRaytracingWaitIdle();
+	glRaytracingClearAllSceneStateInternal();
+	g_glRaytracingScene = glRaytracingSceneState_t();
+	glRaytracingShutdownCmdContext();
+}
+
+void glRaytracingClear(void)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	glRaytracingWaitIdle();
+	glRaytracingClearAllSceneStateInternal();
+}
+
+glRaytracingSceneHandle_t glRaytracingCreateScene(void)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	if (!g_glRaytracingScene.initialized)
+		return 0;
+
+	for (uint32_t i = 0; i < GL_RAYTRACING_MAX_RENDER_WORLDS; ++i)
+	{
+		glRaytracingRenderWorld_t& world = g_glRaytracingScene.worlds[i];
+		if (!world.alive)
+		{
+			const uint32_t handle = i + 1;
+			glRaytracingResetWorldSlot(&world, handle, 1);
+			return handle;
+		}
+	}
+
+	return 0;
+}
+
+void glRaytracingClearScene(glRaytracingSceneHandle_t worldHandle)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	glRaytracingRenderWorld_t* world = glRaytracingFindWorld(worldHandle);
+	if (!world)
+		return;
+
+	glRaytracingWaitIdle();
+	glRaytracingClearWorldContents(world);
+}
+
+void glRaytracingDeleteScene(glRaytracingSceneHandle_t worldHandle)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	glRaytracingRenderWorld_t* world = glRaytracingFindWorld(worldHandle);
+	if (!world)
+		return;
+
+	glRaytracingWaitIdle();
+	glRaytracingReleaseWorldResources(world);
+	*world = glRaytracingRenderWorld_t();
+}
+
+uint32_t glRaytracingGetSceneCount(void)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	uint32_t count = 0;
+	for (int i = 0; i < GL_RAYTRACING_MAX_RENDER_WORLDS; ++i)
+	{
+		if (g_glRaytracingScene.worlds[i].alive)
+			++count;
+	}
+	return count;
+}
+
+glRaytracingMeshHandle_t glRaytracingCreateMesh(const glRaytracingMeshDesc_t* desc)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	if (!g_glRaytracingScene.initialized || !desc)
+		return 0;
+
+	if (!desc->vertices || !desc->indices || desc->vertexCount == 0 || desc->indexCount == 0)
+		return 0;
+
+	glRaytracingMeshRecord_t mesh;
+	mesh.handle = g_glRaytracingScene.nextMeshHandle++;
+	mesh.alive = 1;
+	mesh.descCpu = *desc;
+	mesh.verticesCpu.assign(desc->vertices, desc->vertices + desc->vertexCount);
+	mesh.indicesCpu.assign(desc->indices, desc->indices + desc->indexCount);
+	mesh.descCpu.vertices = nullptr;
+	mesh.descCpu.indices = nullptr;
+	mesh.dirty = 1;
+
+	g_glRaytracingScene.meshes.push_back(mesh);
+	const size_t newIndex = g_glRaytracingScene.meshes.size() - 1;
+	glRaytracingEnsureMeshHandleTable(mesh.handle);
+	g_glRaytracingScene.meshHandleToIndex[mesh.handle] = (int)newIndex;
+
+	return mesh.handle;
+}
+
+int glRaytracingUpdateMesh(glRaytracingMeshHandle_t meshHandle, const glRaytracingMeshDesc_t* desc)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	if (!g_glRaytracingScene.initialized || !desc)
+		return 0;
+
+	glRaytracingMeshRecord_t* mesh = glRaytracingFindMesh(meshHandle);
+	if (!mesh)
+		return 0;
+
+	if (!desc->vertices || !desc->indices || desc->vertexCount == 0 || desc->indexCount == 0)
+		return 0;
+
+	mesh->descCpu = *desc;
+	mesh->verticesCpu.assign(desc->vertices, desc->vertices + desc->vertexCount);
+	mesh->indicesCpu.assign(desc->indices, desc->indices + desc->indexCount);
+	mesh->descCpu.vertices = nullptr;
+	mesh->descCpu.indices = nullptr;
+
+	// Updating a mesh destroys/replaces resources that an already submitted frame
+	// may still reference. Wait only for this destructive path; steady-state
+	// rendering remains asynchronous.
+	glRaytracingWaitIdle();
+
+	mesh->vertexBuffer.resource.Reset();
+	mesh->indexBuffer.resource.Reset();
+	mesh->blasScratch.resource.Reset();
+	mesh->blasResult[0].resource.Reset();
+	mesh->blasResult[1].resource.Reset();
+	mesh->blasScratchSize = 0;
+	mesh->blasResultSize = 0;
+	mesh->blasBuildFenceValue = 0;
+	mesh->blasBuilt = 0;
+	mesh->dirty = 1;
+	mesh->currentBlasIndex = 0;
+
+	glRaytracingInvalidateInstancesForMesh(meshHandle, 0);
+	glRaytracingMarkAllWorldsNeedRebuild();
+
+	return 1;
+}
+
+uint32_t glRaytracingGetMeshMaterialFlags(glRaytracingMeshHandle_t meshHandle)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	const glRaytracingMeshRecord_t* mesh = glRaytracingFindMeshConst(meshHandle);
+	if (!mesh)
+		return 0;
+
+	return mesh->materialFlags;
+}
+
+void glRaytracingSetMeshMaterialFlags(glRaytracingMeshHandle_t meshHandle, uint32_t materialFlags)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	glRaytracingMeshRecord_t* mesh = glRaytracingFindMesh(meshHandle);
+	if (!mesh)
+		return;
+
+	materialFlags &= GL_RAYTRACING_INSTANCE_MATERIAL_MASK;
+	if (mesh->materialFlags == materialFlags)
+		return;
+
+	mesh->materialFlags = materialFlags;
+
+	// The glass bit also represents shim-auto-tagged alpha-blended surfaces.
+	// It changes whether BLAS geometry is opaque, so force a full BLAS rebuild.
+	// The TLAS is also rebuilt so InstanceID carries the material bit.
+	mesh->blasBuilt = 0;
+	mesh->dirty = 1;
+	glRaytracingInvalidateInstancesForMesh(meshHandle, 0);
+	glRaytracingMarkAllWorldsNeedRebuild();
+}
+
+void glRaytracingSetMeshGlass(glRaytracingMeshHandle_t meshHandle, int isGlass)
+{
+	uint32_t flags = glRaytracingGetMeshMaterialFlags(meshHandle);
+	if (isGlass)
+		flags |= GL_RAYTRACING_MATERIAL_FLAG_GLASS;
+	else
+		flags &= ~GL_RAYTRACING_MATERIAL_FLAG_GLASS;
+	glRaytracingSetMeshMaterialFlags(meshHandle, flags);
+}
+
+void glRaytracingDeleteMesh(glRaytracingMeshHandle_t meshHandle)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	glRaytracingMeshRecord_t* mesh = glRaytracingFindMesh(meshHandle);
+	if (!mesh)
+		return;
+
+	glRaytracingWaitIdle();
+	glRaytracingInvalidateInstancesForMesh(meshHandle, 1);
+
+	mesh->alive = 0;
+	mesh->vertexBuffer.resource.Reset();
+	mesh->indexBuffer.resource.Reset();
+	mesh->blasScratch.resource.Reset();
+	mesh->blasResult[0].resource.Reset();
+	mesh->blasResult[1].resource.Reset();
+	mesh->blasScratchSize = 0;
+	mesh->blasResultSize = 0;
+	mesh->blasBuildFenceValue = 0;
+	mesh->blasBuilt = 0;
+	mesh->dirty = 0;
+
+	if (meshHandle < g_glRaytracingScene.meshHandleToIndex.size())
+		g_glRaytracingScene.meshHandleToIndex[meshHandle] = -1;
+
+	glRaytracingMarkAllWorldsNeedRebuild();
+}
+
+static inline uint32_t glRaytracingNormalizeVisibleInstanceMask(uint32_t mask)
+{
+	mask &= 0xFFu;
+	return mask ? mask : 0xFFu;
+}
+
+glRaytracingInstanceHandle_t glRaytracingCreateInstanceInScene(glRaytracingSceneHandle_t worldHandle, const glRaytracingInstanceDesc_t* desc)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	if (!g_glRaytracingScene.initialized || !desc)
+		return 0;
+
+	glRaytracingRenderWorld_t* world = glRaytracingFindWorld(worldHandle);
+	if (!world)
+		return 0;
+
+	if (!glRaytracingFindMeshConst(desc->meshHandle))
+		return 0;
+
+	glRaytracingInstanceRecord_t inst;
+	inst.handle = world->nextInstanceHandle++;
+	inst.alive = 1;
+	inst.descCpu = *desc;
+	inst.descCpu.mask = glRaytracingNormalizeVisibleInstanceMask(inst.descCpu.mask);
+	inst.dirty = 1;
+
+	world->instances.push_back(inst);
+	const size_t newIndex = world->instances.size() - 1;
+	glRaytracingEnsureInstanceHandleTable(world, inst.handle);
+	world->instanceHandleToIndex[inst.handle] = (int)newIndex;
+	glRaytracingMarkWorldNeedsRebuild(world);
+	return inst.handle;
+}
+
+int glRaytracingUpdateInstanceInScene(glRaytracingSceneHandle_t worldHandle, glRaytracingInstanceHandle_t instanceHandle, const glRaytracingInstanceDesc_t* desc)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	if (!g_glRaytracingScene.initialized || !desc)
+		return 0;
+
+	glRaytracingRenderWorld_t* world = glRaytracingFindWorld(worldHandle);
+	if (!world)
+		return 0;
+
+	if (!glRaytracingFindMeshConst(desc->meshHandle))
+		return 0;
+
+	glRaytracingInstanceRecord_t* inst = glRaytracingFindInstance(world, instanceHandle);
+	if (!inst)
+		return 0;
+
+	const uint32_t oldMeshHandle = inst->descCpu.meshHandle;
+	const uint32_t oldMask = ((uint32_t)inst->descCpu.mask) & 0xFFu;
+	const int wasHidden = (oldMask == 0u);
+
+	glRaytracingInstanceDesc_t newDesc = *desc;
+
+	// If this instance is hidden, keep it hidden even if the caller's
+	// transform-update helper sends mask = 0xFF again.
+	newDesc.mask = wasHidden
+		? 0u
+		: glRaytracingNormalizeVisibleInstanceMask(newDesc.mask);
+
+	inst->descCpu = newDesc;
+	inst->dirty = 1;
+
+	if (oldMeshHandle != desc->meshHandle)
+	{
+		glRaytracingInvalidateInstanceCache(inst);
+		glRaytracingMarkWorldNeedsRebuild(world);
+	}
+	else
+	{
+		glRaytracingMarkWorldNeedsUpdate(world);
+	}
+
+	return 1;
+}
+
+void glRaytracingDeleteInstanceInScene(glRaytracingSceneHandle_t worldHandle, glRaytracingInstanceHandle_t instanceHandle)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	glRaytracingRenderWorld_t* world = glRaytracingFindWorld(worldHandle);
+	if (!world)
+		return;
+
+	glRaytracingInstanceRecord_t* inst = glRaytracingFindInstance(world, instanceHandle);
+	if (!inst)
+		return;
+
+	glRaytracingInvalidateInstanceCache(inst);
+	inst->alive = 0;
+	if (instanceHandle < world->instanceHandleToIndex.size())
+		world->instanceHandleToIndex[instanceHandle] = -1;
+	glRaytracingMarkWorldNeedsRebuild(world);
+}
+
+int glRaytracingBuildMesh(glRaytracingMeshHandle_t meshHandle)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	if (!g_glRaytracingScene.initialized)
+		return 0;
+
+	glRaytracingMeshRecord_t* mesh = glRaytracingFindMesh(meshHandle);
+	if (!mesh)
+		return 0;
+
+	return glRaytracingBuildMeshInternal(mesh);
+}
+
+int glRaytracingBuildAllMeshes(void)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	if (!g_glRaytracingScene.initialized)
+		return 0;
+
+	return glRaytracingBuildDirtyMeshesInternal();
+}
+
+int glRaytracingBuildSceneForHandle(glRaytracingSceneHandle_t worldHandle)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	if (!g_glRaytracingScene.initialized)
+		return 0;
+
+	glRaytracingRenderWorld_t* world = glRaytracingFindWorld(worldHandle);
+	if (!world)
+		return 0;
+
+	if (!glRaytracingBuildDirtyMeshesInternal())
+		return 0;
+
+	return glRaytracingBuildSceneInternal(world);
+}
+
+ID3D12Resource* glRaytracingGetTopLevelASForScene(glRaytracingSceneHandle_t worldHandle)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	if (!g_glRaytracingScene.initialized)
+		return nullptr;
+
+	glRaytracingRenderWorld_t* world = glRaytracingFindWorld(worldHandle);
+	if (!world)
+		return nullptr;
+
+	if (!glRaytracingBuildDirtyMeshesInternal())
+		return nullptr;
+
+	if (!glRaytracingBuildSceneInternal(world))
+		return nullptr;
+
+	if (!world->tlasBuilt)
+		return nullptr;
+
+	return glRaytracingGetCurrentTLASBuffer(world)->resource.Get();
+}
+
+uint32_t glRaytracingGetMeshCount(void)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	uint32_t count = 0;
+	for (size_t i = 0; i < g_glRaytracingScene.meshes.size(); ++i)
+	{
+		if (g_glRaytracingScene.meshes[i].alive)
+			++count;
+	}
+	return count;
+}
+
+uint32_t glRaytracingGetInstanceCountForScene(glRaytracingSceneHandle_t worldHandle)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	const glRaytracingRenderWorld_t* world = glRaytracingFindWorldConst(worldHandle);
+	return glRaytracingCountAliveInstances(world);
+}
+
+// ============================================================
+// Lighting state
+// ============================================================
+
+struct glRaytracingLightingConstants_t
+{
+	float invViewProj[16];
+	float invViewMatrix[16];
+	float viewProj[16];
+	float cameraPos[4];
+	float ambientColor[4];
+	float screenSize[4];
+
+	// Keep this CPU layout 16-byte aligned with the HLSL cbuffer.
+	float normalReconstructZ;
+	uint32_t lightCount;
+	uint32_t enableSpecular;
+	uint32_t enableHalfLambert;
+
+	float shadowBias;
+	uint32_t frameIndex;
+	uint32_t samplesPerPixel;
+	uint32_t maxBounces;
+
+	uint32_t enableDenoiser;
+	uint32_t denoisePassIndex;
+	float denoiseStepWidth;
+	float denoiseStrength;
+
+	float denoisePhiColor;
+	float denoisePhiNormal;
+	float denoisePhiPosition;
+	float bumpStrength;
+};
+
+struct glRaytracingLightingState_t
+{
+	std::vector<glRaytracingLight_t> cpuLights;
+	// CPU-only metadata parallel to cpuLights. 0 = caller-managed light.
+	// Non-zero keys are used by the renderer bridge for persistent geometry emitters
+	// so they can be updated instead of cleared/re-added every frame.
+	std::vector<uint32_t> cpuLightKeys;
+	glRaytracingLightingConstants_t constants;
+
+	ComPtr<ID3D12DescriptorHeap> descriptorHeap;
+	ComPtr<ID3D12DescriptorHeap> descriptorHeapRing[GL_RAYTRACING_CMD_RING_SIZE];
+	UINT descriptorStride;
+
+	glRaytracingBuffer_t constantBuffer;
+	glRaytracingBuffer_t lightBuffer;
+	void* constantBufferMapped;
+	void* lightBufferMapped;
+	glRaytracingBuffer_t constantBufferRing[GL_RAYTRACING_CMD_RING_SIZE];
+	glRaytracingBuffer_t lightBufferRing[GL_RAYTRACING_CMD_RING_SIZE];
+	void* constantBufferMappedRing[GL_RAYTRACING_CMD_RING_SIZE];
+	void* lightBufferMappedRing[GL_RAYTRACING_CMD_RING_SIZE];
+
+	ComPtr<ID3D12RootSignature> globalRootSig;
+	ComPtr<ID3D12RootSignature> localRootSig;
+
+	ComPtr<ID3D12StateObject> rtStateObject;
+	ComPtr<ID3D12StateObjectProperties> rtStateProps;
+
+	glRaytracingBuffer_t raygenTable;
+	glRaytracingBuffer_t missTable;
+	glRaytracingBuffer_t hitTable;
+
+	ComPtr<ID3D12PipelineState> denoisePSO;
+	ComPtr<ID3D12PipelineState> temporalPSO;
+	glRaytracingTexture_t pathTraceTexture;
+	glRaytracingTexture_t temporalTexture;
+	glRaytracingTexture_t historyTexture[2];
+	glRaytracingTexture_t denoiseTemp[2];
+	uint32_t currentHistoryIndex;
+	glRaytracingBuffer_t denoiseConstantBuffer[3];
+	glRaytracingBuffer_t denoiseConstantBufferRing[GL_RAYTRACING_CMD_RING_SIZE][3];
+	void* denoiseConstantBufferMapped[3];
+	void* denoiseConstantBufferMappedRing[GL_RAYTRACING_CMD_RING_SIZE][3];
+	UINT denoiseWidth;
+	UINT denoiseHeight;
+	DXGI_FORMAT denoiseFormat;
+	uint32_t frameCounter;
+	bool externalDenoiser;
+	ID3D12Resource* emissiveTexture;
+	DXGI_FORMAT emissiveFormat;
+	ID3D12Resource* specularTexture;
+	DXGI_FORMAT specularFormat;
+	bool uploadToCurrentFrameResource;
+	bool initialized;
+
+	glRaytracingLightingState_t()
+	{
+		memset(&constants, 0, sizeof(constants));
+		descriptorStride = 0;
+		constantBufferMapped = nullptr;
+		lightBufferMapped = nullptr;
+		for (UINT frame = 0; frame < GL_RAYTRACING_CMD_RING_SIZE; ++frame)
+		{
+			constantBufferMappedRing[frame] = nullptr;
+			lightBufferMappedRing[frame] = nullptr;
+			for (int i = 0; i < 3; ++i)
+				denoiseConstantBufferMappedRing[frame][i] = nullptr;
+		}
+		for (int i = 0; i < 3; ++i)
+			denoiseConstantBufferMapped[i] = nullptr;
+		denoiseWidth = 0;
+		denoiseHeight = 0;
+		denoiseFormat = DXGI_FORMAT_UNKNOWN;
+		currentHistoryIndex = 0;
+		frameCounter = 0;
+		externalDenoiser = false;
+		emissiveTexture = nullptr;
+		emissiveFormat = DXGI_FORMAT_R16G16B16A16_FLOAT;
+		specularTexture = nullptr;
+		specularFormat = DXGI_FORMAT_R8G8B8A8_UNORM;
+		uploadToCurrentFrameResource = false;
+		initialized = false;
+	}
+};
+
+static glRaytracingLightingState_t g_glRaytracingLighting;
+
+static const DXGI_FORMAT GL_RAYTRACING_DENOISE_FORMAT = DXGI_FORMAT_R16G16B16A16_FLOAT;
+// CPU-only light metadata keys.  These do not change the GPU Light layout.
+// The high bit marks renderer-generated geometry emitters.  They are kept across
+// ordinary transient-light clears and upserted by key so moving the camera does
+// not make an off-screen emissive card stop lighting the scene.
+static const uint32_t GL_RAYTRACING_LIGHT_KEY_NONE = 0u;
+static const uint32_t GL_RAYTRACING_LIGHT_KEY_GEOMETRY_EMISSIVE_BIT = 0x80000000u;
+static const float GL_RAYTRACING_LIGHT_PERSISTANT_GEOMETRY_EMISSIVE = -2.0f;
+
+static inline uint32_t glRaytracingMakeGeometryEmissiveLightKey(uint32_t key)
+{
+	key &= ~GL_RAYTRACING_LIGHT_KEY_GEOMETRY_EMISSIVE_BIT;
+	if (key == GL_RAYTRACING_LIGHT_KEY_NONE)
+		key = 1u;
+	return key | GL_RAYTRACING_LIGHT_KEY_GEOMETRY_EMISSIVE_BIT;
+}
+
+static inline bool glRaytracingLightKeyIsGeometryEmissive(uint32_t key)
+{
+	return (key & GL_RAYTRACING_LIGHT_KEY_GEOMETRY_EMISSIVE_BIT) != 0u;
+}
+
+static inline void glRaytracingLightingEnsureLightKeyCount()
+{
+	if (g_glRaytracingLighting.cpuLightKeys.size() != g_glRaytracingLighting.cpuLights.size())
+		g_glRaytracingLighting.cpuLightKeys.resize(g_glRaytracingLighting.cpuLights.size(), GL_RAYTRACING_LIGHT_KEY_NONE);
+}
+
+enum glRaytracingLightingDescriptorIndex_t
+{
+	GLR_DESC_LIGHTS_SRV = 0,
+	GLR_DESC_ALBEDO_SRV = 1,
+	GLR_DESC_DEPTH_SRV = 2,
+	GLR_DESC_NORMAL_SRV = 3,
+	GLR_DESC_POSITION_SRV = 4,
+	GLR_DESC_TLAS_SRV = 5,
+	GLR_DESC_PATHTRACE_SRV = 6,
+	GLR_DESC_DENOISE_A_SRV = 7,
+	GLR_DESC_DENOISE_B_SRV = 8,
+	GLR_DESC_HISTORY_SRV = 9,
+	GLR_DESC_TEMPORAL_SRV = 10,
+	GLR_DESC_EMISSIVE_SRV = 11,
+	GLR_DESC_SPECULAR_SRV = 12,
+	GLR_DESC_PATHTRACE_UAV = 13,
+	GLR_DESC_DENOISE_A_UAV = 14,
+	GLR_DESC_DENOISE_B_UAV = 15,
+	GLR_DESC_OUTPUT_UAV = 16,
+	GLR_DESC_TEMPORAL_UAV = 17,
+	GLR_DESC_HISTORY_UAV = 18,
+	GLR_DESC_COUNT = 19,
+	GLR_DESC_SRV_COUNT = 13,
+	GLR_DESC_UAV_COUNT = 6
+};
+
+static void glRaytracingLightingResetDenoiseHistory(void)
+{
+	// Kept under the old name so existing call sites keep compiling. This now
+	// invalidates the temporal GI accumulator as well as restarting stochastic
+	// sample indexing after material/camera/light/scene changes.
+	g_glRaytracingLighting.frameCounter = 0;
+	g_glRaytracingLighting.constants.frameIndex = 0;
+	g_glRaytracingLighting.currentHistoryIndex = 0;
+}
+
+static const char* g_glRaytracingLightingHlsl = R"(
+struct Light
+{
+    float3 position;
+    float  radius;
+
+    float3 color;
+    float  intensity;
+
+    float3 normal;
+    uint   type;
+
+    float3 axisU;
+    float  halfWidth;
+
+    float3 axisV;
+    float  halfHeight;
+
+    uint   samples;
+    uint   twoSided;
+    float  persistant;
+
+    // Reuses the old pad1 slot in glRaytracingLight_t.  Keeping this in the
+    // same 16-byte lane preserves the CPU StructuredBuffer stride while giving
+    // point/spot lights an explicit volumetric scattering control.
+    // <= 0 disables the effect.  Values around 0.25-1.0 are useful in Doom 3 units.
+    float  volumetricScattering;
+
+    // For point lights, this is the axis-aligned XYZ attenuation radius.
+    // For spot lights, pointRadius.x stores the near clip plane.
+    // The scalar radius above is still kept as a max/fallback range for point lights,
+    // as the influence range for rect lights, and as the far clip distance for spot lights.
+    float3 pointRadius;
+    float  pointRadiusPad; // non-zero disables specular for this light
+    float  falloffPower;
+    float3 falloffPad;
+};
+
+struct ShadowPayload
+{
+    uint hit;
+};
+
+struct BouncePayload
+{
+    uint  hit;
+    float hitT;
+    uint  materialFlags;
+    uint  pad0;
+};
+
+cbuffer LightingCB : register(b0)
+{
+    float4x4 gInvViewProj;
+    float4x4 gInvViewMatrix;
+    float4x4 gViewProj;
+    float4   gCameraPos;
+    float4   gAmbientColor;
+    float4   gScreenSize;
+    float    gNormalReconstructZ;
+    uint     gLightCount;
+    uint     gEnableSpecular;
+    uint     gEnableHalfLambert;
+    float    gShadowBias;
+    uint     gFrameIndex;
+    uint     gSamplesPerPixel;
+    uint     gMaxBounces;
+    uint     gEnableDenoiser;
+    uint     gDenoisePassIndex;
+    float    gDenoiseStepWidth;
+    float    gDenoiseStrength;
+    float    gDenoisePhiColor;
+    float    gDenoisePhiNormal;
+    float    gDenoisePhiPosition;
+    float    gBumpStrength;
+};
+
+StructuredBuffer<Light> gLights : register(t0);
+Texture2D<float4>       gAlbedoTex   : register(t1);
+Texture2D<float>        gDepthTex    : register(t2);
+Texture2D<float4>       gNormalTex   : register(t3);
+Texture2D<float4>       gPositionTex : register(t4);
+RaytracingAccelerationStructure gSceneBVH : register(t5);
+Texture2D<float4>       gEmissiveTex : register(t11);
+Texture2D<float4>       gSpecularTex : register(t12);
+RWTexture2D<float4>     gOutputTex   : register(u0);
+
+static const uint GL_RAYTRACING_LIGHT_TYPE_POINT = 0;
+static const uint GL_RAYTRACING_LIGHT_TYPE_RECT  = 1;
+static const uint GL_RAYTRACING_LIGHT_TYPE_SPOT  = 2;
+
+static const uint GEOMETRY_FLAG_NONE     = 0;
+static const uint GEOMETRY_FLAG_SKELETAL = 1;
+static const uint GEOMETRY_FLAG_UNLIT    = 2;
+static const uint GEOMETRY_FLAG_GLASS    = 4;
+
+// The shim encodes per-instance material flags into the upper bits of
+// D3D12_RAYTRACING_INSTANCE_DESC::InstanceID so any-hit shaders can make
+// visibility decisions without binding a separate material table.
+static const uint GL_RAYTRACING_INSTANCE_USER_ID_MASK       = 0x0000FFFFu;
+static const uint GL_RAYTRACING_INSTANCE_MATERIAL_SHIFT     = 16u;
+static const uint GL_RAYTRACING_INSTANCE_MATERIAL_MASK      = 0x000000FFu;
+static const uint GL_RAYTRACING_MATERIAL_FLAG_GLASS         = 0x00000001u;
+
+float3 SafeNormalizeOr(float3 v, float3 fallbackDir);
+
+uint DecodeInstanceMaterialFlags()
+{
+    return (InstanceID() >> GL_RAYTRACING_INSTANCE_MATERIAL_SHIFT) &
+        GL_RAYTRACING_INSTANCE_MATERIAL_MASK;
+}
+
+bool CurrentRayHitIsGlass()
+{
+    return (DecodeInstanceMaterialFlags() & GL_RAYTRACING_MATERIAL_FLAG_GLASS) != 0u;
+}
+
+uint DecodeGeometryFlag(float geoFlag)
+{
+    // position.w comes from a render target / buffer path, so do not require exact
+    // float equality. Values like 0.999, 1.001, 1.99, 2.02 should decode correctly.
+    //
+    // Clamp negative garbage to 0, then round to nearest integer flag.
+    float f = max(geoFlag, 0.0);
+    return (uint)floor(f + 0.5);
+}
+
+bool GeometryFlagEquals(float geoFlag, uint expectedFlag)
+{
+    return DecodeGeometryFlag(geoFlag) == expectedFlag;
+}
+
+bool GeometryFlagHas(float geoFlag, uint expectedFlag)
+{
+    // Supports both current single-value usage and future bitmask usage.
+    uint decoded = DecodeGeometryFlag(geoFlag);
+    return (decoded & expectedFlag) != 0u;
+}
+
+float3 LoadScenePosition(uint2 pixel)
+{
+    float4 p = gPositionTex.Load(int3(pixel, 0));
+    return p.xyz;
+}
+
+float4 LoadSceneNormal(uint2 pixel)
+{
+    float4 nSample = gNormalTex.Load(int3(pixel, 0));
+    return nSample;
+}
+
+float SafeLengthSq(float3 v)
+{
+    return max(dot(v, v), 1e-8);
+}
+
+float3 SafeNormalizeLocal(float3 v, float3 fallback)
+{
+    float lenSq = dot(v, v);
+    return (lenSq > 1e-8) ? (v * rsqrt(lenSq)) : fallback;
+}
+
+float BumpLuminance(float3 c)
+{
+    return dot(c, float3(0.299, 0.587, 0.114));
+}
+
+float3 EnhanceBumpNormal(uint2 pixel, float3 worldPos, float3 baseAlbedo, bool isSkeletal)
+{
+    float3 N = SafeNormalizeLocal(LoadSceneNormal(pixel).xyz, float3(0.0, 0.0, 1.0));
+
+    // Character albedo has skin, cloth, and painted detail that should not be
+    // interpreted as height.  The synthetic bump pass looks good on old walls,
+    // but it makes animated models crawl and self-shadow like noisy relief maps.
+    if (isSkeletal)
+        return N;
+
+    float strength = max(gBumpStrength, 0.0);
+    if (strength <= 0.001)
+        return N;
+
+    int2 p = int2(pixel);
+    int2 maxP = int2((int)gScreenSize.x - 1, (int)gScreenSize.y - 1);
+
+    int2 pxm = clamp(p + int2(-1,  0), int2(0, 0), maxP);
+    int2 pxp = clamp(p + int2( 1,  0), int2(0, 0), maxP);
+    int2 pym = clamp(p + int2( 0, -1), int2(0, 0), maxP);
+    int2 pyp = clamp(p + int2( 0,  1), int2(0, 0), maxP);
+
+    float3 posL = gPositionTex.Load(int3(pxm, 0)).xyz;
+    float3 posR = gPositionTex.Load(int3(pxp, 0)).xyz;
+    float3 posU = gPositionTex.Load(int3(pym, 0)).xyz;
+    float3 posD = gPositionTex.Load(int3(pyp, 0)).xyz;
+
+    float3 T = posR - posL;
+    float3 B = posD - posU;
+
+    // Fall back to a stable tangent basis when the position buffer is flat or invalid.
+    if (dot(T, T) <= 1e-8 || dot(B, B) <= 1e-8)
+    {
+        float3 up = (abs(N.z) < 0.999) ? float3(0.0, 0.0, 1.0) : float3(0.0, 1.0, 0.0);
+        T = SafeNormalizeLocal(cross(up, N), float3(1.0, 0.0, 0.0));
+        B = cross(N, T);
+    }
+    else
+    {
+        T = SafeNormalizeLocal(T - N * dot(N, T), float3(1.0, 0.0, 0.0));
+        B = SafeNormalizeLocal(B - N * dot(N, B), float3(0.0, 1.0, 0.0));
+    }
+
+    float hL = BumpLuminance(saturate(gAlbedoTex.Load(int3(pxm, 0)).rgb));
+    float hR = BumpLuminance(saturate(gAlbedoTex.Load(int3(pxp, 0)).rgb));
+    float hU = BumpLuminance(saturate(gAlbedoTex.Load(int3(pym, 0)).rgb));
+    float hD = BumpLuminance(saturate(gAlbedoTex.Load(int3(pyp, 0)).rgb));
+
+    // Height-gradient bump from the diffuse texture.  The scale is intentionally
+    // aggressive because the current renderer has no dedicated height/normal map
+    // slot here, and old idTech/Build textures need the fake relief to read.
+    float dhdx = (hR - hL);
+    float dhdy = (hD - hU);
+    float3 heightNormal = SafeNormalizeLocal(N - (T * dhdx + B * dhdy) * (strength * 4.25), N);
+
+    float3 nL = SafeNormalizeLocal(gNormalTex.Load(int3(pxm, 0)).xyz, N);
+    float3 nR = SafeNormalizeLocal(gNormalTex.Load(int3(pxp, 0)).xyz, N);
+    float3 nU = SafeNormalizeLocal(gNormalTex.Load(int3(pym, 0)).xyz, N);
+    float3 nD = SafeNormalizeLocal(gNormalTex.Load(int3(pyp, 0)).xyz, N);
+    float3 avgN = SafeNormalizeLocal((nL + nR + nU + nD) * 0.25, N);
+
+    // Amplify real G-buffer normal-map variation as well.
+    float3 detailN = SafeNormalizeLocal(N + (N - avgN) * (strength * 1.75), N);
+
+    float3 outN = SafeNormalizeLocal(lerp(detailN, heightNormal, 0.65), N);
+
+    // Avoid flipping normals so far that shadows/specular explode.
+    if (dot(outN, N) < 0.25)
+        outN = SafeNormalizeLocal(lerp(N, outN, 0.45), N);
+
+    return outN;
+}
+
+[shader("miss")]
+void ShadowMiss(inout ShadowPayload payload)
+{
+    payload.hit = 0;
+}
+
+[shader("anyhit")]
+void ShadowAnyHit(inout ShadowPayload payload, in BuiltInTriangleIntersectionAttributes attr)
+{
+    // Glass/alpha-blended surfaces should participate in the primary/raster image,
+    // but visibility rays must continue through them. Mark the BLAS geometry
+    // non-opaque on the CPU side so this any-hit shader runs, then IgnoreHit()
+    // lets the ray keep going to whatever is behind the pane/sprite.
+    if (CurrentRayHitIsGlass())
+    {
+        IgnoreHit();
+        return;
+    }
+}
+
+[shader("closesthit")]
+void ShadowClosestHit(inout ShadowPayload payload, in BuiltInTriangleIntersectionAttributes attr)
+{
+    // Safety fallback for incorrectly-built glass geometry. Correct glass meshes
+    // are non-opaque and are ignored by ShadowAnyHit() above.
+    if (CurrentRayHitIsGlass())
+    {
+        payload.hit = 0;
+        return;
+    }
+
+    payload.hit = 1;
+}
+
+[shader("miss")]
+void BounceMiss(inout BouncePayload payload)
+{
+    payload.hit = 0;
+    payload.hitT = 0.0;
+    payload.materialFlags = 0;
+    payload.pad0 = 0;
+}
+
+[shader("anyhit")]
+void BounceAnyHit(inout BouncePayload payload, in BuiltInTriangleIntersectionAttributes attr)
+{
+    // Secondary diffuse rays should see through the same transparent surfaces that
+    // shadow rays see through. This keeps a pane/sprite from killing all bounced
+    // light behind it.
+    if (CurrentRayHitIsGlass())
+    {
+        IgnoreHit();
+        return;
+    }
+}
+
+[shader("closesthit")]
+void BounceClosestHit(inout BouncePayload payload, in BuiltInTriangleIntersectionAttributes attr)
+{
+    // Fallback for transparent geometry that was accidentally built opaque.
+    // Correctly tagged transparent surfaces are ignored in BounceAnyHit() above.
+    if (CurrentRayHitIsGlass())
+    {
+        payload.hit = 0;
+        payload.hitT = 0.0;
+        payload.materialFlags = DecodeInstanceMaterialFlags();
+        payload.pad0 = 0;
+        return;
+    }
+
+    payload.hit = 1;
+    payload.hitT = RayTCurrent();
+    payload.materialFlags = DecodeInstanceMaterialFlags();
+    payload.pad0 = 0;
+}
+
+[shader("closesthit")]
+void ReflectionClosestHit(inout BouncePayload payload, in BuiltInTriangleIntersectionAttributes attr)
+{
+    // Specular rays are view rays, not diffuse/visibility rays. They should
+    // report the first reflected surface even when that surface was tagged as
+    // glass/alpha, otherwise glass panes/sprites vanish from mirror-like hits.
+    payload.hit = 1;
+    payload.hitT = RayTCurrent();
+    payload.materialFlags = DecodeInstanceMaterialFlags();
+    payload.pad0 = 0;
+}
+
+float TraceShadow(float3 origin, float3 dir, float maxT)
+{
+    RayDesc ray;
+    ray.Origin = origin;
+    ray.Direction = dir;
+    ray.TMin = 5.0;
+    ray.TMax = maxT;
+
+    ShadowPayload payload;
+    payload.hit = 0;
+
+    TraceRay(
+        gSceneBVH,
+        RAY_FLAG_ACCEPT_FIRST_HIT_AND_END_SEARCH,
+        0xFF,
+        0,
+        0,
+        0,
+        ray,
+        payload);
+
+    return (payload.hit != 0) ? 0.0 : 1.0;
+}
+
+bool TraceBounce(float3 origin, float3 dir, float maxT, out float hitT, out uint materialFlags)
+{
+    RayDesc ray;
+    ray.Origin = origin;
+    ray.Direction = dir;
+    ray.TMin = 0.001;
+    ray.TMax = maxT;
+
+    BouncePayload payload;
+    payload.hit = 0;
+    payload.hitT = 0.0;
+    payload.materialFlags = 0;
+    payload.pad0 = 0;
+
+    TraceRay(
+        gSceneBVH,
+        RAY_FLAG_ACCEPT_FIRST_HIT_AND_END_SEARCH,
+        0xFF,
+        1,
+        0,
+        1,
+        ray,
+        payload);
+
+    hitT = payload.hitT;
+    materialFlags = payload.materialFlags;
+    return payload.hit != 0;
+}
+
+bool TraceSpecularReflection(float3 origin, float3 dir, float maxT, out float hitT, out uint materialFlags)
+{
+    RayDesc ray;
+    ray.Origin = origin;
+    ray.Direction = dir;
+    ray.TMin = 0.001;
+    ray.TMax = maxT;
+
+    BouncePayload payload;
+    payload.hit = 0;
+    payload.hitT = 0.0;
+    payload.materialFlags = 0;
+    payload.pad0 = 0;
+
+    TraceRay(
+        gSceneBVH,
+        RAY_FLAG_NONE,
+        0xFF,
+        2,
+        0,
+        1,
+        ray,
+        payload);
+
+    hitT = payload.hitT;
+    materialFlags = payload.materialFlags;
+    return payload.hit != 0;
+}
+
+float Hash12(float2 p)
+{
+    float3 p3 = frac(float3(p.xyx) * 0.1031);
+    p3 += dot(p3, p3.yzx + 33.33);
+    return frac((p3.x + p3.y) * p3.z);
+}
+
+float2 Hammersley2D(uint i, uint N, float rand)
+{
+    float e1 = frac((float)i / (float)N + rand);
+
+    uint bits = i;
+    bits = (bits << 16) | (bits >> 16);
+    bits = ((bits & 0x55555555u) << 1) | ((bits & 0xAAAAAAAAu) >> 1);
+    bits = ((bits & 0x33333333u) << 2) | ((bits & 0xCCCCCCCCu) >> 2);
+    bits = ((bits & 0x0F0F0F0Fu) << 4) | ((bits & 0xF0F0F0F0u) >> 4);
+    bits = ((bits & 0x00FF00FFu) << 8) | ((bits & 0xFF00FF00u) >> 8);
+
+    float e2 = (float)bits * 2.3283064365386963e-10;
+    return float2(e1, e2);
+}
+
+float2 ConcentricSampleDisk(float2 u)
+{
+    float2 uOffset = 2.0 * u - 1.0;
+
+    if (uOffset.x == 0.0 && uOffset.y == 0.0)
+        return float2(0.0, 0.0);
+
+    float r, theta;
+    if (abs(uOffset.x) > abs(uOffset.y))
+    {
+        r = uOffset.x;
+        theta = (3.14159265 / 4.0) * (uOffset.y / uOffset.x);
+    }
+    else
+    {
+        r = uOffset.y;
+        theta = (3.14159265 / 2.0) - (3.14159265 / 4.0) * (uOffset.x / uOffset.y);
+    }
+
+    return r * float2(cos(theta), sin(theta));
+}
+
+void BuildOrthonormalBasis(float3 n, out float3 t, out float3 b)
+{
+    float3 up = (abs(n.z) < 0.999) ? float3(0.0, 0.0, 1.0) : float3(0.0, 1.0, 0.0);
+    t = normalize(cross(up, n));
+    b = cross(n, t);
+}
+
+float3 CosineSampleHemisphere(float2 u)
+{
+    float2 d = ConcentricSampleDisk(u);
+    float z = sqrt(saturate(1.0 - dot(d, d)));
+    return float3(d.x, d.y, z);
+}
+
+float3 GetPointLightRadius(Light Lgt)
+{
+    float scalarRadius = max(abs(Lgt.radius), 1e-4);
+    float3 r = abs(Lgt.pointRadius);
+
+    // Allow older/zero-initialized light records to behave like the old scalar radius.
+    if (max(max(r.x, r.y), r.z) <= 1e-4)
+    {
+        r = float3(scalarRadius, scalarRadius, scalarRadius);
+    }
+
+    return max(r, float3(1e-4, 1e-4, 1e-4));
+}
+
+float GetPointLightMaxRadius(Light Lgt)
+{
+    float3 r = GetPointLightRadius(Lgt);
+    return max(max(r.x, r.y), r.z);
+}
+
+float3 Doom3SafeNormalizeOr(float3 v, float3 fallbackDir)
+{
+    float lenSq = dot(v, v);
+    return (lenSq > 1e-8) ? (v * rsqrt(lenSq)) : fallbackDir;
+}
+
+float Doom3QuadraticFalloffImage(float texCoord)
+{
+    // Math version of Doom 3 BFG's built-in _quadratic lookup table.
+    // The source table is 32 texels wide, brightest at the center and clamped
+    // to black outside the light volume.
+    if (texCoord <= 0.0 || texCoord >= 1.0)
+        return 0.0;
+
+    const float QUADRATIC_WIDTH = 32.0;
+
+    // Convert a normalized lookup coordinate to the source generator's texel-space
+    // x value, then apply the same centered squared ramp used by R_QuadraticImage().
+    float x = texCoord * QUADRATIC_WIDTH - 0.5;
+    float d = x - (QUADRATIC_WIDTH * 0.5 - 0.5);
+    d = abs(d);
+    d -= 0.5;
+    d /= (QUADRATIC_WIDTH * 0.5);
+    d = 1.0 - d;
+    d = saturate(d);
+    return d * d;
+}
+
+float Doom3QuadraticCentered(float centeredCoord)
+{
+    // centeredCoord is -1 at one side of the light volume, 0 at the light center,
+    // and +1 at the opposite side.
+    return Doom3QuadraticFalloffImage(centeredCoord * 0.5 + 0.5);
+}
+
+float Doom3ProjectionTexture2D(float2 centeredCoord)
+{
+    // Doom 3 multiplies a projected light image by a separate falloff image. This
+    // renderer does not bind Doom light materials/cookies, so use the same built-in
+    // quadratic shape on S/T as a neutral default projection texture approximation.
+    if (abs(centeredCoord.x) >= 1.0 || abs(centeredCoord.y) >= 1.0)
+        return 0.0;
+
+    return Doom3QuadraticCentered(centeredCoord.x) * Doom3QuadraticCentered(centeredCoord.y);
+}
+
+float Doom3ProjectedCookieDefault(float2 centeredCoord)
+{
+    // Without the actual light stage image, keep default projected lights neutral
+    // inside their S/T clip planes. The default Doom 3 projected falloff is
+    // _noFalloff, and using the point-light quadratic here makes spotlights much
+    // darker than the engine's fixed-function interaction path.
+    return (abs(centeredCoord.x) < 1.0 && abs(centeredCoord.y) < 1.0) ? 1.0 : 0.0;
+}
+)"
+R"(
+float Doom3ProjectedDepthFalloff(float depth, float nearClip, float farClip)
+{
+    // Doom 3's default projected light uses _noFalloff: it is clipped by the
+    // start/end planes but does not distance-fade through the frustum.
+    return (depth > nearClip && depth < farClip) ? 1.0 : 0.0;
+}
+
+float AttenuationBasic(float lightDist, float maxLightDist, float falloffPower)
+{
+    float attenuation = 1.0 - saturate(lightDist / max(maxLightDist, 1e-4));
+    falloffPower = (falloffPower > 0.0) ? falloffPower : 0.25;
+    return pow(attenuation, falloffPower);
+}
+
+float Spotify(float3 lightVector, float3 spotDir, float outerAngle, float innerAngle)
+{
+    return smoothstep(outerAngle, innerAngle, saturate(dot(lightVector, spotDir)));
+}
+
+float ComputePointLightAttenuation(float3 worldPos, Light Lgt)
+{
+    float3 radii = GetPointLightRadius(Lgt);
+    float3 offset = worldPos - Lgt.position;
+
+    // Rage/Tango-style point attenuation from the provided shader:
+    // perAxis = 1 - saturate(abs(fragment - lightPos) / extents)
+    // attenuation = pow(perAxis.x * perAxis.y * perAxis.z, falloffPower)
+    float3 axisU = Doom3SafeNormalizeOr(Lgt.axisU, float3(1.0, 0.0, 0.0));
+    float3 axisV = Doom3SafeNormalizeOr(Lgt.axisV, float3(0.0, 1.0, 0.0));
+    float3 axisW = Doom3SafeNormalizeOr(Lgt.normal, float3(0.0, 0.0, 1.0));
+
+    float3 perAxis;
+    perAxis.x = 1.0 - saturate(abs(dot(offset, axisU)) / radii.x);
+    perAxis.y = 1.0 - saturate(abs(dot(offset, axisV)) / radii.y);
+    perAxis.z = 1.0 - saturate(abs(dot(offset, axisW)) / radii.z);
+
+    float falloffPower = (Lgt.falloffPower > 0.0) ? Lgt.falloffPower : 0.25;
+    return pow(perAxis.x * perAxis.y * perAxis.z, falloffPower);
+}
+)"
+R"(
+float ComputeSpotLightAttenuation(float3 worldPos, Light Lgt)
+{
+    float3 lightToSurface = worldPos - Lgt.position;
+
+    float nearClip = max(Lgt.pointRadius.x, 0.0);
+    float farClip  = max(Lgt.radius, nearClip + 1e-4);
+
+    float3 spotDir = Doom3SafeNormalizeOr(Lgt.normal, float3(0.0, 0.0, 1.0));
+
+    float depth = dot(lightToSurface, spotDir);
+
+    if (depth <= nearClip || depth >= farClip)
+        return 0.0;
+
+    float3 axisU = Doom3SafeNormalizeOr(Lgt.axisU, float3(1.0, 0.0, 0.0));
+    float3 axisV = Doom3SafeNormalizeOr(Lgt.axisV, float3(0.0, 1.0, 0.0));
+
+    float invDepth = 1.0 / max(depth, 1e-4);
+
+    float halfU = max(abs(Lgt.halfWidth),  1e-4);
+    float halfV = max(abs(Lgt.halfHeight), 1e-4);
+
+    float signedU = (dot(lightToSurface, axisU) * invDepth) / halfU;
+    float signedV = (dot(lightToSurface, axisV) * invDepth) / halfV;
+
+    if (abs(signedU) >= 1.0 || abs(signedV) >= 1.0)
+        return 0.0;
+
+    float3 lightVector = normalize(lightToSurface);
+    float maxSlope = max(halfU, halfV);
+    float outerAngle = rsqrt(1.0 + maxSlope * maxSlope);
+    float innerSlope = maxSlope * 0.65;
+    float innerAngle = rsqrt(1.0 + innerSlope * innerSlope);
+
+    float spotCookie = Spotify(lightVector, spotDir, outerAngle, innerAngle);
+    float distFalloff = AttenuationBasic(depth - nearClip, farClip - nearClip, Lgt.falloffPower);
+
+    return spotCookie * distFalloff;
+}
+
+float TraceSpotShadow(float3 worldPos, float3 N, float3 toLight, float dist)
+{
+    float3 L = toLight / max(dist, 1e-6);
+
+    float NdotLRaw   = saturate(dot(N, L));
+    float normalBias = lerp(gShadowBias * 3.0, gShadowBias * 0.75, NdotLRaw);
+
+    float3 shadowOrigin = worldPos + N * normalBias + L * (gShadowBias * 0.5);
+    float  shadowTMax   = max(dist - gShadowBias * 0.5, 0.001);
+
+    return TraceShadow(shadowOrigin, L, shadowTMax);
+}
+
+float TraceSoftShadow(float3 worldPos, float3 N, Light Lgt, float3 toLight, float dist)
+{
+    const uint SHADOW_SAMPLES = 4;
+
+    float3 L = toLight / max(dist, 1e-6);
+
+    float3 tangent, bitangent;
+    BuildOrthonormalBasis(L, tangent, bitangent);
+
+    float areaRadius = max(GetPointLightMaxRadius(Lgt) * 0.03, 0.12);
+
+    float shadowAccum = 0.0;
+    float rand = Hash12(worldPos.xy + float2(worldPos.z, dist));
+
+    [unroll]
+    for (uint s = 0; s < SHADOW_SAMPLES; ++s)
+    {
+        float2 xi = Hammersley2D(s, SHADOW_SAMPLES, rand);
+        float2 d  = ConcentricSampleDisk(xi) * areaRadius;
+
+        float3 sampleLightPos = Lgt.position + tangent * d.x + bitangent * d.y;
+        float3 sampleVec      = sampleLightPos - worldPos;
+        float  sampleDist     = length(sampleVec);
+
+        if (sampleDist <= 1e-4)
+        {
+            shadowAccum += 1.0;
+            continue;
+        }
+
+        float3 sampleDir = sampleVec / sampleDist;
+
+        float NdotLRaw   = saturate(dot(N, sampleDir));
+        float normalBias = lerp(gShadowBias * 3.0, gShadowBias * 0.75, NdotLRaw);
+
+        float3 shadowOrigin = worldPos + N * normalBias + sampleDir * (gShadowBias * 0.5);
+        float  shadowTMax   = max(sampleDist - gShadowBias * 0.5, 0.001);
+
+        shadowAccum += TraceShadow(shadowOrigin, sampleDir, shadowTMax);
+    }
+
+    return shadowAccum / (float)SHADOW_SAMPLES;
+}
+)"
+R"(
+static const uint QD3D12_MAX_RECT_LIGHT_SAMPLES = 4u;
+
+uint ClampRectLightSampleCount(uint requestedSamples)
+{
+    return min(max(requestedSamples, 1u), QD3D12_MAX_RECT_LIGHT_SAMPLES);
+}
+
+float2 StableRectLightSampleUV(uint sampleIndex, uint sampleCount)
+{
+    if (sampleCount <= 1u)
+        return float2(0.0, 0.0);
+
+    // Deterministic, symmetric positions. Do not rotate/jitter these per pixel
+    // or per frame; changing the sample pattern was the visible sparkle source
+    // for geometry emitter cards. Larger emitters can request up to 16 stable
+    // taps, which is still cheap enough for a small number of tagged emitters.
+    uint s = sampleIndex & 15u;
+
+    if (sampleCount <= 4u)
+    {
+        // Center-first pattern: fast, stable, and less likely to make a large
+        // visible emitter go black just because every corner tap was occluded.
+        if (s == 0u) return float2( 0.00,  0.00);
+        if (s == 1u) return float2(-0.60, -0.60);
+        if (s == 2u) return float2( 0.60, -0.60);
+        return              float2( 0.00,  0.60);
+    }
+
+    if (sampleCount <= 8u)
+    {
+        if (s == 0u) return float2( 0.00,  0.00);
+        if (s == 1u) return float2(-0.65, -0.65);
+        if (s == 2u) return float2( 0.65, -0.65);
+        if (s == 3u) return float2(-0.65,  0.65);
+        if (s == 4u) return float2( 0.65,  0.65);
+        if (s == 5u) return float2(-0.25,  0.00);
+        if (s == 6u) return float2( 0.25,  0.00);
+        return              float2( 0.00,  0.25);
+    }
+
+    // 4x4 stratified grid in [-0.875, +0.875].
+    float x = (((float)(s & 3u) + 0.5) * 0.5) - 1.0;
+    float y = (((float)(s >> 2u) + 0.5) * 0.5) - 1.0;
+    return float2(x, y) * 0.875;
+}
+
+float RectLightShadow(float3 worldPos, float3 N, Light Lgt, uint2 pixel)
+{
+    uint sampleCount = ClampRectLightSampleCount(Lgt.samples);
+
+    float visibility = 0.0;
+
+    float NoL_center = saturate(dot(N, normalize(Lgt.position - worldPos)));
+    float normalBias = lerp(gShadowBias * 4.0, gShadowBias * 0.75, NoL_center);
+    float3 baseOrigin = worldPos + N * normalBias;
+
+    [loop]
+    for (uint s = 0; s < sampleCount; ++s)
+    {
+        float2 uv = StableRectLightSampleUV(s, sampleCount);
+
+        float3 sampleLightPos =
+            Lgt.position +
+            Lgt.axisU * (uv.x * Lgt.halfWidth) +
+            Lgt.axisV * (uv.y * Lgt.halfHeight);
+
+        float3 toLight = sampleLightPos - baseOrigin;
+        float distToLight = length(toLight);
+
+        if (distToLight <= 1e-4)
+        {
+            visibility += 1.0;
+            continue;
+        }
+
+        float3 L = toLight / distToLight;
+
+        float NdotL = dot(N, L);
+        if (NdotL <= 0.0)
+        {
+            continue;
+        }
+
+        float emitTerm = (Lgt.twoSided != 0)
+            ? abs(dot(Lgt.normal, -L))
+            : dot(Lgt.normal, -L);
+
+        if (emitTerm <= 0.0)
+        {
+            continue;
+        }
+
+        float3 shadowOrigin = baseOrigin + L * (gShadowBias * 0.5);
+        float shadowTMax = max(distToLight - gShadowBias, 0.001);
+
+        visibility += TraceShadow(shadowOrigin, L, shadowTMax);
+    }
+
+    return visibility / (float)sampleCount;
+}
+
+float ComputeAmbientOcclusion(float3 worldPos, float3 N, uint2 pixel, bool isSkeletal)
+{
+    const uint AO_SAMPLES = 8;
+    float aoRadius = isSkeletal ? 18.0 : 32.0;
+
+    float3 tangent, bitangent;
+    BuildOrthonormalBasis(N, tangent, bitangent);
+
+    float rand = Hash12((float2)pixel + worldPos.xy + worldPos.zz);
+
+    float visibility = 0.0;
+
+    [unroll]
+    for (uint i = 0; i < AO_SAMPLES; ++i)
+    {
+        float2 xi = Hammersley2D(i, AO_SAMPLES, rand);
+        float3 h  = CosineSampleHemisphere(xi);
+
+        float3 aoDir =
+            tangent   * h.x +
+            bitangent * h.y +
+            N         * h.z;
+
+        aoDir = normalize(aoDir);
+
+        float3 aoOrigin = worldPos + N * (gShadowBias * (isSkeletal ? 0.75 : 0.15));
+
+        visibility += TraceShadow(aoOrigin, aoDir, aoRadius);
+    }
+
+    visibility /= (float)AO_SAMPLES;
+    visibility = saturate(pow(visibility, 1.5));
+
+    if (isSkeletal)
+        visibility = lerp(visibility, 1.0, 0.45);
+
+    return visibility;
+}
+
+float3 GetSkyLightDirection10AM()
+{
+    // Direction from the shaded point TO the sky/sun.
+    // 10:00 AM style: angled, not straight vertical.
+    //
+    // Flip X/Y signs if you want the shadows cast the opposite horizontal way.
+    return normalize(float3(-0.55, -0.25, 0.80));
+}
+)"
+R"(
+float ComputeSkyVisibility(float3 worldPos, float3 N, uint2 pixel)
+{
+    const uint  SKY_SAMPLES = 4;
+    const float SKY_TMAX    = 1000000.0;
+
+    // Soft angular size of the sky/sun shadow cone.
+    // Larger = softer shadows, but more chance of light leaking.
+    const float SKY_SOFTNESS = 0.085;
+
+    float3 skyCenterDir = GetSkyLightDirection10AM();
+
+    float NoSky = dot(N, skyCenterDir);
+
+    // Mostly back-facing relative to the sky direction.
+    // Return black visibility instead of casting unstable grazing rays.
+    if (NoSky <= -0.35)
+    {
+        return 0.0;
+    }
+
+    float3 tangent, bitangent;
+    BuildOrthonormalBasis(skyCenterDir, tangent, bitangent);
+
+    float normalBias = lerp(gShadowBias * 4.0, gShadowBias * 1.0, saturate(NoSky));
+
+    float3 baseOrigin =
+        worldPos +
+        N * normalBias +
+        skyCenterDir * (gShadowBias * 2.0);
+
+    float visibility = 0.0;
+
+    // IMPORTANT:
+    // No per-pixel random rotation here.
+    // The old noise came from random hemisphere sky sampling.
+    // This keeps the soft shadow sampling pattern stable per pixel/frame.
+    [unroll]
+    for (uint i = 0; i < SKY_SAMPLES; ++i)
+    {
+        float2 xi = Hammersley2D(i, SKY_SAMPLES, 0.0);
+        float2 d  = ConcentricSampleDisk(xi) * SKY_SOFTNESS;
+
+        float3 skyDir = normalize(
+            skyCenterDir +
+            tangent   * d.x +
+            bitangent * d.y);
+
+        // Do not shoot rays below the world horizon.
+        if (skyDir.z <= 0.02)
+        {
+            visibility += 0.0;
+            continue;
+        }
+
+        float sampleFacing = dot(N, skyDir);
+
+        // Avoid very noisy grazing rays on back-facing surfaces.
+        if (sampleFacing <= -0.35)
+        {
+            visibility += 0.0;
+            continue;
+        }
+
+        float3 skyOrigin =
+            worldPos +
+            N * normalBias +
+            skyDir * (gShadowBias * 2.0);
+
+        visibility += TraceShadow(skyOrigin, skyDir, SKY_TMAX);
+    }
+
+    visibility /= (float)SKY_SAMPLES;
+
+    // Slightly smooth the binary ray result so it does not look harsh.
+    return saturate(visibility);
+}
+
+float ComputeCavity(uint2 pixel, float3 worldPos, float3 N)
+{
+    static const int2 taps[12] =
+    {
+        int2(-2,  0), int2( 2,  0),
+        int2( 0, -2), int2( 0,  2),
+        int2(-2, -2), int2( 2, -2),
+        int2(-2,  2), int2( 2,  2),
+        int2(-4,  0), int2( 4,  0),
+        int2( 0, -4), int2( 0,  4)
+    };
+
+    float accum = 0.0;
+    float weightSum = 0.0;
+
+    [unroll]
+    for (int i = 0; i < 12; ++i)
+    {
+        int2 sp = int2(pixel) + taps[i];
+
+        if (sp.x < 0 || sp.y < 0 || sp.x >= (int)gScreenSize.x || sp.y >= (int)gScreenSize.y)
+            continue;
+
+        float3 samplePos = gPositionTex.Load(int3(sp, 0)).xyz;
+        float3 sampleN   = normalize(gNormalTex.Load(int3(sp, 0)).xyz);
+
+        float3 d = samplePos - worldPos;
+        float distSq = dot(d, d);
+
+        if (distSq > (24.0 * 24.0))
+            continue;
+
+        float nd = dot(N, sampleN);
+        if (nd < 0.65)
+            continue;
+
+        float curvature = 1.0 - saturate(nd);
+        float w = 1.0 / (1.0 + distSq * 0.02);
+
+        accum += curvature * w;
+        weightSum += w;
+    }
+
+    float cavity = (weightSum > 0.0) ? (accum / weightSum) : 0.0;
+    cavity = saturate(cavity * 2.0);
+
+    return 1.0 - cavity * 0.18;
+}
+
+float Doom3SpecularLookup(float x)
+{
+    // Doom 3 used a lookup table for specular falloff.  A single high-power
+    // lobe is too binary with this G-buffer path: small normal-map/grazing
+    // differences make some materials lose specular completely.  Use a broad
+    // plastic lobe plus a tighter hot spot so highlights stay readable without
+    // turning into a flat additive wash.
+    x = saturate(x);
+
+    float broad = pow(x, 12.0);
+    float tight = pow(x, 48.0);
+
+    return saturate(broad * 0.55 + tight * 0.85);
+}
+
+float SpecularPeak3(float3 c)
+{
+    return max(max(c.r, c.g), c.b);
+}
+
+bool LooksLikeAuthoredSpecularSample(float4 specSample, float3 baseAlbedo)
+{
+    // Normal path: alpha is the raster G-buffer validity bit.
+    if (specSample.a > 0.5)
+        return true;
+
+    // Tolerant path: some raster paths/specular inputs write RGB but leave the
+    // validity alpha at zero.  Do not treat the fallback albedo descriptor as a
+    // spec map; when no specular texture is bound, specSample.rgb == baseAlbedo.
+    float3 specRgb = saturate(specSample.rgb);
+    float3 baseRgb = saturate(baseAlbedo);
+    float rgbPeak = SpecularPeak3(specRgb);
+    float rgbDiff = length(specRgb - baseRgb);
+
+    return rgbPeak > 0.025 && rgbDiff > 0.035;
+}
+
+float3 Doom3PseudoSpecularMask(float3 baseAlbedo)
+{
+    // Doom 3 normally uses a dedicated specular map.
+    // This fallback is only used for pixels whose specular G-buffer says no
+    // specular map was written by the raster pass.
+    float lum = dot(saturate(baseAlbedo), float3(0.299, 0.587, 0.114));
+
+    float specStrength = lerp(0.22, 0.72, saturate(lum * 1.35));
+
+    // Slight warm/colored contribution from the diffuse texture, but mostly neutral
+    // like a missing/default specular map.
+    float3 neutralSpec = float3(specStrength, specStrength, specStrength);
+    float3 tintedSpec  = saturate(baseAlbedo) * 0.35 + neutralSpec * 0.65;
+
+    return max(tintedSpec, float3(0.18, 0.18, 0.18));
+}
+
+float3 LoadSceneSpecularAlbedo(uint2 pixel, float3 baseAlbedo)
+{
+    float4 specSample = gSpecularTex.Load(int3(pixel, 0));
+
+    // The raster G-buffer writer stores alpha as a validity bit.  This matters
+    // for black specular maps: black should mean zero specular, not "missing map".
+    // Also accept RGB-only specular inputs when they are clearly not the fallback
+    // albedo descriptor, which fixes materials whose specular buffer forgot to
+    // set the alpha-valid bit.
+    if (LooksLikeAuthoredSpecularSample(specSample, baseAlbedo))
+        return saturate(specSample.rgb);
+
+    return Doom3PseudoSpecularMask(baseAlbedo);
+}
+
+
+float ComputeDiffuseLightingTerm(float3 N, float3 L)
+{
+    // Keep the original light volume/range attenuation exactly where it is, but
+    // make the surface response less gamey.  The old 0.28-0.32 Half-Lambert wrap
+    // pushed too much light around silhouettes and into back-facing normal-map
+    // detail.  This smaller squared wrap keeps Doom/idTech readability while
+    // giving a more Lambert-like, physically plausible rolloff.
+    float rawNoL = dot(normalize(N), normalize(L));
+
+    if (gEnableHalfLambert != 0u)
+    {
+        const float REALISTIC_WRAP = 0.12;
+        float wrapped = saturate((rawNoL + REALISTIC_WRAP) / (1.0 + REALISTIC_WRAP));
+        return wrapped * wrapped;
+    }
+
+    return saturate(rawNoL);
+}
+
+float EstimateSpecularRoughness(float3 specularAlbedo)
+{
+    // No roughness map is available in this G-buffer path, so infer a stable
+    // perceptual roughness from the specular map strength.  Brighter spec maps
+    // get tighter highlights; dark/missing maps stay broad and subdued.
+    float peak = SpecularPeak3(saturate(specularAlbedo));
+    return clamp(lerp(0.68, 0.34, peak), 0.28, 0.72);
+}
+
+float3 ComputeSpecular(
+    float3 N,
+    float3 V,
+    float3 L,
+    float3 lightColor,
+    float lightIntensity,
+    float atten,
+    float shadow,
+    float3 specularAlbedo)
+{
+    if (gEnableSpecular == 0)
+        return 0.0;
+
+    if (atten <= 0.0 || shadow <= 0.0)
+        return 0.0;
+
+    N = normalize(N);
+    V = normalize(V);
+    L = normalize(L);
+
+    float NoL = saturate(dot(N, L));
+    float NoV = saturate(dot(N, V));
+
+    if (NoL <= 1.0e-4 || NoV <= 1.0e-4)
+        return 0.0;
+
+    float3 H = Doom3SafeNormalizeOr(L + V, N);
+    float NoH = saturate(dot(N, H));
+    float VoH = saturate(dot(V, H));
+
+    if (NoH <= 1.0e-4 || VoH <= 1.0e-4)
+        return 0.0;
+
+    float3 specMask = saturate(specularAlbedo);
+    float specPeak = SpecularPeak3(specMask);
+    if (specPeak <= 0.001)
+        return 0.0;
+
+    float roughness = EstimateSpecularRoughness(specMask);
+    float a = roughness * roughness;
+    float a2 = max(a * a, 1.0e-4);
+
+    const float PI = 3.14159265;
+
+    // GGX/Trowbridge-Reitz distribution with Smith masking and Schlick Fresnel.
+    // This is still intentionally stylized for the existing idTech-style assets,
+    // but it produces more believable view-dependent highlights than the previous
+    // additive lookup lobe and does not alter light attenuation distance.
+    float dDenom = NoH * NoH * (a2 - 1.0) + 1.0;
+    float D = a2 / max(PI * dDenom * dDenom, 1.0e-4);
+
+    float k = ((roughness + 1.0) * (roughness + 1.0)) * 0.125;
+    float Gv = NoV / max(NoV * (1.0 - k) + k, 1.0e-4);
+    float Gl = NoL / max(NoL * (1.0 - k) + k, 1.0e-4);
+    float G = Gv * Gl;
+
+    float3 F0 = saturate(lerp(float3(0.025, 0.025, 0.025), specMask, 0.58));
+    float3 F = F0 + (1.0 - F0) * pow(1.0 - VoH, 5.0);
+
+    float specTerm = (D * G) / max(4.0 * NoL * NoV, 1.0e-4);
+    specTerm = min(specTerm, 5.0);
+
+    const float SPECULAR_ENERGY_SCALE = 2.35;
+
+    float3 specular =
+        lightColor *
+        lightIntensity *
+        atten *
+        shadow *
+        NoL *
+        F *
+        specTerm *
+        SPECULAR_ENERGY_SCALE;
+
+    return clamp(specular, 0.0, 8.0);
+}
+)"
+R"(
+float TraceStraightUpToSky(float3 worldPos, float3 N)
+{
+    const float SKY_TMAX = 1000000.0;
+    float3 skyDir = float3(0.0, 0.0, 1.0);
+    float NoSky = dot(N, skyDir);
+    float normalBias = lerp(gShadowBias * 4.0, gShadowBias * 1.0, saturate(NoSky));
+
+    float3 skyOrigin =
+        worldPos +
+        N * normalBias +
+        skyDir * (gShadowBias * 2.0);
+
+    return TraceShadow(skyOrigin, skyDir, SKY_TMAX);
+}
+
+uint PcgHash(uint input)
+{
+    uint state = input * 747796405u + 2891336453u;
+    uint word = ((state >> ((state >> 28u) + 4u)) ^ state) * 277803737u;
+    return (word >> 22u) ^ word;
+}
+
+uint InitRng(uint2 pixel, uint frameIndex, uint sampleIndex)
+{
+    uint seed = pixel.x * 1973u;
+    seed ^= pixel.y * 9277u;
+    seed ^= frameIndex * 26699u;
+    seed ^= sampleIndex * 374761393u;
+    return PcgHash(seed) | 1u;
+}
+
+float Rand(inout uint rng)
+{
+    rng = PcgHash(rng);
+    return (float)rng * 2.3283064365386963e-10;
+}
+
+float2 Rand2(inout uint rng)
+{
+    return float2(Rand(rng), Rand(rng));
+}
+
+float3 SampleCosineWorld(float3 N, inout uint rng)
+{
+    float3 tangent, bitangent;
+    BuildOrthonormalBasis(N, tangent, bitangent);
+
+    float3 localDir = CosineSampleHemisphere(Rand2(rng));
+    return normalize(
+        tangent   * localDir.x +
+        bitangent * localDir.y +
+        N         * localDir.z);
+}
+
+float3 SampleConeWorld(float3 centerDir, float coneRadius, inout uint rng)
+{
+    float3 tangent, bitangent;
+    BuildOrthonormalBasis(centerDir, tangent, bitangent);
+
+    float2 d = ConcentricSampleDisk(Rand2(rng)) * coneRadius;
+    return normalize(centerDir + tangent * d.x + bitangent * d.y);
+}
+
+float3 GetSkyRadiance(float3 dir)
+{
+    float upness = saturate(dir.z * 0.5 + 0.5);
+
+    float3 warmSky = float3(0.98, 0.55, 0.35);
+    float3 coolSky = float3(0.30, 0.40, 0.62);
+    float3 sky = lerp(warmSky * 0.22, coolSky * 0.55, upness);
+
+    float sunAmount = pow(saturate(dot(dir, GetSkyLightDirection10AM())), 96.0);
+    sky += warmSky * (sunAmount * 2.25);
+
+    return sky;
+}
+
+float TraceVisibilityBiased(float3 worldPos, float3 N, float3 dir, float maxT)
+{
+    float NoD = saturate(dot(N, dir));
+    float normalBias = lerp(gShadowBias * 3.0, gShadowBias * 0.75, NoD);
+    float3 origin = worldPos + N * normalBias + dir * (gShadowBias * 0.5);
+    return TraceShadow(origin, dir, max(maxT - gShadowBias * 0.5, 0.001));
+}
+
+
+float3 CompressEmissiveRadiance(float3 e, float peakLimit)
+{
+    e = max(e, 0.0);
+    float peak = max(max(e.r, e.g), e.b);
+    if (peak > peakLimit && peak > 1e-5)
+        e *= peakLimit / peak;
+    return e;
+}
+
+float3 LoadEmissiveRadianceClamped(int2 p)
+{
+    int2 maxPixel = int2((int)gScreenSize.x - 1, (int)gScreenSize.y - 1);
+    p = clamp(p, int2(0, 0), maxPixel);
+    float3 radiance = CompressEmissiveRadiance(gEmissiveTex.Load(int3(p, 0)).rgb, 18.0);
+    return min(radiance + sqrt(max(radiance, 0.0)) * 0.35, 22.0);
+}
+
+float3 EstimateEmissiveBloomAtPixel(uint2 pixel)
+{
+    int2 p = int2(pixel);
+
+    // Strong threshold-free bloom in the ray output. Particle emissive lighting
+    // is injected separately below; this is the visible camera halo.
+    float3 bloom = 0.0;
+    bloom += LoadEmissiveRadianceClamped(p) * 0.320;
+
+    bloom += LoadEmissiveRadianceClamped(p + int2( 1,  0)) * 0.420;
+    bloom += LoadEmissiveRadianceClamped(p + int2(-1,  0)) * 0.420;
+    bloom += LoadEmissiveRadianceClamped(p + int2( 0,  1)) * 0.420;
+    bloom += LoadEmissiveRadianceClamped(p + int2( 0, -1)) * 0.420;
+
+    bloom += LoadEmissiveRadianceClamped(p + int2( 2,  2)) * 0.260;
+    bloom += LoadEmissiveRadianceClamped(p + int2(-2,  2)) * 0.260;
+    bloom += LoadEmissiveRadianceClamped(p + int2( 2, -2)) * 0.260;
+    bloom += LoadEmissiveRadianceClamped(p + int2(-2, -2)) * 0.260;
+
+    bloom += LoadEmissiveRadianceClamped(p + int2( 4,  0)) * 0.180;
+    bloom += LoadEmissiveRadianceClamped(p + int2(-4,  0)) * 0.180;
+    bloom += LoadEmissiveRadianceClamped(p + int2( 0,  4)) * 0.180;
+    bloom += LoadEmissiveRadianceClamped(p + int2( 0, -4)) * 0.180;
+
+    bloom += LoadEmissiveRadianceClamped(p + int2( 8,  0)) * 0.120;
+    bloom += LoadEmissiveRadianceClamped(p + int2(-8,  0)) * 0.120;
+    bloom += LoadEmissiveRadianceClamped(p + int2( 0,  8)) * 0.120;
+    bloom += LoadEmissiveRadianceClamped(p + int2( 0, -8)) * 0.120;
+
+    bloom += LoadEmissiveRadianceClamped(p + int2( 14,  0)) * 0.075;
+    bloom += LoadEmissiveRadianceClamped(p + int2(-14,  0)) * 0.075;
+    bloom += LoadEmissiveRadianceClamped(p + int2( 0,  14)) * 0.075;
+    bloom += LoadEmissiveRadianceClamped(p + int2( 0, -14)) * 0.075;
+
+    bloom += LoadEmissiveRadianceClamped(p + int2( 24,  0)) * 0.045;
+    bloom += LoadEmissiveRadianceClamped(p + int2(-24,  0)) * 0.045;
+    bloom += LoadEmissiveRadianceClamped(p + int2( 0,  24)) * 0.045;
+    bloom += LoadEmissiveRadianceClamped(p + int2( 0, -24)) * 0.045;
+
+    bloom += LoadEmissiveRadianceClamped(p + int2( 42,  0)) * 0.025;
+    bloom += LoadEmissiveRadianceClamped(p + int2(-42,  0)) * 0.025;
+    bloom += LoadEmissiveRadianceClamped(p + int2( 0,  42)) * 0.025;
+    bloom += LoadEmissiveRadianceClamped(p + int2( 0, -42)) * 0.025;
+
+    return min(bloom * 1.45, 28.0);
+}
+
+float3 SafeNormalizeOr(float3 v, float3 fallback)
+{
+    float lenSq = dot(v, v);
+    if (lenSq <= 1e-8)
+        return fallback;
+    return v * rsqrt(lenSq);
+}
+
+bool TryScreenParticleWorldCandidate(float4 clip, float3 receiverPos, inout float bestDistSq, inout float3 bestWorld)
+{
+    float4 worldA = mul(clip, gInvViewProj);
+    if (abs(worldA.w) > 1e-6)
+    {
+        float3 candidate = worldA.xyz / worldA.w;
+        float distSq = dot(candidate - receiverPos, candidate - receiverPos);
+        if (distSq < bestDistSq && distSq > 1e-4 && distSq < 147456.0)
+        {
+            bestDistSq = distSq;
+            bestWorld = candidate;
+        }
+    }
+
+    float4 worldB = mul(gInvViewProj, clip);
+    if (abs(worldB.w) > 1e-6)
+    {
+        float3 candidate = worldB.xyz / worldB.w;
+        float distSq = dot(candidate - receiverPos, candidate - receiverPos);
+        if (distSq < bestDistSq && distSq > 1e-4 && distSq < 147456.0)
+        {
+            bestDistSq = distSq;
+            bestWorld = candidate;
+        }
+    }
+
+    return bestDistSq < 147456.0;
+}
+
+bool TryReconstructScreenParticleWorld(uint2 particlePixel, float particleDepth, float3 receiverPos, out float3 particleWorld)
+{
+    float2 uv = ((float2)particlePixel + 0.5) / max(gScreenSize.xy, float2(1.0, 1.0));
+    float x = uv.x * 2.0 - 1.0;
+    float yUp = 1.0 - uv.y * 2.0;
+    float yDown = uv.y * 2.0 - 1.0;
+
+    float bestDistSq = 1.0e30;
+    particleWorld = receiverPos;
+    TryScreenParticleWorldCandidate(float4(x, yUp, particleDepth, 1.0), receiverPos, bestDistSq, particleWorld);
+    TryScreenParticleWorldCandidate(float4(x, yDown, particleDepth, 1.0), receiverPos, bestDistSq, particleWorld);
+    return bestDistSq < 147456.0;
+}
+
+float3 EstimateScreenSpaceEmissiveParticleLighting(uint2 pixel, float3 worldPos, float3 N)
+{
+    static const int2 kParticleLightTaps[17] =
+    {
+        int2(  0,   0),
+        int2(  7,   0), int2( -7,   0), int2(  0,   7), int2(  0,  -7),
+        int2( 10,  10), int2(-10,  10), int2( 10, -10), int2(-10, -10),
+        int2( 18,   4), int2(-18,  -4), int2(  4,  18), int2( -4, -18),
+        int2( 30,   0), int2(-30,   0), int2(  0,  30), int2(  0, -30)
+    };
+
+    int2 maxPixel = int2((int)gScreenSize.x - 1, (int)gScreenSize.y - 1);
+    float pixelScale = max(1.0, round(min(gScreenSize.x, gScreenSize.y) / 720.0));
+    float3 lighting = 0.0;
+
+    [unroll]
+    for (uint i = 0u; i < 17u; ++i)
+    {
+        int2 sp = int2(pixel) + int2(round((float2)kParticleLightTaps[i] * pixelScale));
+        sp = clamp(sp, int2(0, 0), maxPixel);
+
+        float4 particleEmission = gEmissiveTex.Load(int3(sp, 0));
+        if (particleEmission.a <= 1.5)
+            continue;
+
+        float particleDepth = saturate(particleEmission.a - 2.0);
+        float3 particleWorld;
+        if (!TryReconstructScreenParticleWorld(uint2(sp), particleDepth, worldPos, particleWorld))
+            continue;
+
+        float3 toParticle = particleWorld - worldPos;
+        float distSq = dot(toParticle, toParticle);
+        if (distSq <= 1e-4 || distSq >= 147456.0)
+            continue;
+
+        float dist = sqrt(distSq);
+        float3 L = toParticle / dist;
+        float NoL = saturate(dot(N, L));
+        if (NoL <= 0.01)
+            continue;
+
+        float visibility = TraceVisibilityBiased(worldPos, N, L, dist);
+        if (visibility <= 0.0)
+            continue;
+
+        float distanceFade = saturate(1.0 - dist / 640.0);
+        distanceFade *= distanceFade;
+        float attenuation = distanceFade / (1.0 + distSq * 0.000075);
+        lighting += CompressEmissiveRadiance(particleEmission.rgb, 24.0) * (NoL * visibility * attenuation);
+    }
+
+    return lighting * 9.0;
+}
+
+// Screen-space material projection removed. Secondary/reflection paths no longer
+// project DXR hits back into the camera G-buffer.
+float3 EstimatePathTracedSky(float3 worldPos, float3 N, inout uint rng)
+{
+    const float SKY_TMAX = 1000000.0;
+
+    uint bounceSamples = max(gMaxBounces, 1u);
+    bounceSamples = min(bounceSamples, 4u);
+
+    float3 accum = 0.0;
+
+    [loop]
+    for (uint b = 0; b < bounceSamples; ++b)
+    {
+        float3 dir = SampleCosineWorld(N, rng);
+        float NoD = saturate(dot(N, dir));
+        float visibility = TraceVisibilityBiased(worldPos, N, dir, SKY_TMAX);
+
+        // This is a G-buffer path-traced approximation: secondary hits are used as
+        // occluders because this pass does not bind per-triangle material data yet.
+        accum += GetSkyRadiance(dir) * visibility * NoD;
+    }
+
+    accum /= (float)bounceSamples;
+    return accum * 0.55;
+}
+
+float3 PathTraceDirectPointLight(uint2 pixel, float3 worldPos, float3 N, float3 V, float3 baseAlbedo, float3 specularAlbedo, Light Lgt, inout uint rng, out float3 specularOut)
+{
+    specularOut = 0.0;
+
+    float3 toCenter = Lgt.position - worldPos;
+    float centerDist = length(toCenter);
+    if (centerDist <= 0.01)
+        return 0.0;
+
+    float3 centerDir = toCenter / centerDist;
+    float3 tangent, bitangent;
+    BuildOrthonormalBasis(centerDir, tangent, bitangent);
+
+    float atten = ComputePointLightAttenuation(worldPos, Lgt);
+    if (atten <= 0.0)
+        return 0.0;
+
+    uint sampleCount = max(Lgt.samples, 1u);
+    sampleCount = (gEnableDenoiser == 0u) ? 1u : min(sampleCount, 4u);
+
+    // One random area-light sample per frame was one of the visible noise sources.
+    // Use a deterministic low-discrepancy pattern instead. With a single sample,
+    // use the light center so default point lights are hard-shadowed and stable.
+    float areaRadius = (sampleCount > 1u && Lgt.samples > 1u) ? max(GetPointLightMaxRadius(Lgt) * 0.03, 0.12) : 0.0;
+    float rand = Hash12((float2)pixel + worldPos.xy + float2(worldPos.z, centerDist));
+
+    float3 diffuseAccum = 0.0;
+    float3 specAccum = 0.0;
+
+    [loop]
+    for (uint s = 0u; s < sampleCount; ++s)
+    {
+        float2 disk = float2(0.0, 0.0);
+        if (areaRadius > 0.0)
+            disk = ConcentricSampleDisk(Hammersley2D(s, sampleCount, rand)) * areaRadius;
+
+        float3 sampleLightPos = Lgt.position + tangent * disk.x + bitangent * disk.y;
+        float3 toLight = sampleLightPos - worldPos;
+        float dist = length(toLight);
+        if (dist <= 0.01)
+            continue;
+
+        float3 L = toLight / dist;
+
+        float diffuseNoL = ComputeDiffuseLightingTerm(N, L);
+
+        float shadow = 1.0;
+        if (Lgt.samples != 0u && diffuseNoL > 0.0001)
+            shadow = TraceVisibilityBiased(worldPos, N, L, dist);
+
+        if (Lgt.pointRadiusPad <= 0.5)
+            specAccum += ComputeSpecular(N, V, L, Lgt.color, Lgt.intensity, atten, shadow, specularAlbedo);
+
+        diffuseAccum += Lgt.color * (Lgt.intensity * atten * diffuseNoL * shadow);
+    }
+
+    float invSamples = 1.0 / (float)sampleCount;
+    specularOut = specAccum * invSamples;
+    return diffuseAccum * invSamples;
+}
+
+float3 PathTraceDirectSpotLight(float3 worldPos, float3 N, float3 V, float3 baseAlbedo, float3 specularAlbedo, Light Lgt, inout uint rng, out float3 specularOut)
+{
+    specularOut = 0.0;
+
+    float3 toLight = Lgt.position - worldPos;
+    float dist = length(toLight);
+    if (dist <= 0.01)
+        return 0.0;
+
+    float3 L = toLight / dist;
+    float atten = ComputeSpotLightAttenuation(worldPos, Lgt);
+
+    float diffuseNoL = ComputeDiffuseLightingTerm(N, L);
+
+    float shadow = 1.0;
+    if (Lgt.samples != 0u && diffuseNoL > 0.0001 && atten > 0.0)
+        shadow = TraceVisibilityBiased(worldPos, N, L, dist);
+
+    if (Lgt.pointRadiusPad <= 0.5)
+        specularOut = ComputeSpecular(N, V, L, Lgt.color, Lgt.intensity, atten, shadow, specularAlbedo);
+
+    return Lgt.color * (Lgt.intensity * atten * diffuseNoL * shadow);
+}
+
+float3 PathTraceDirectRectLight(uint2 pixel, float3 worldPos, float3 N, float3 V, float3 baseAlbedo, float3 specularAlbedo, Light Lgt, inout uint rng, out float3 specularOut)
+{
+    specularOut = 0.0;
+
+    float3 toCenter = Lgt.position - worldPos;
+    float centerDist = length(toCenter);
+    if (centerDist <= 0.01)
+        return 0.0;
+
+    float attenRadius = max(Lgt.radius, 1e-4);
+    float atten = saturate((attenRadius - centerDist) / attenRadius);
+    atten = atten * atten * atten * atten;
+
+    if (atten <= 0.0)
+        return 0.0;
+
+    uint sampleCount = ClampRectLightSampleCount(Lgt.samples);
+
+    float3 diffuseAccum = 0.0;
+    float3 specAccum = 0.0;
+
+    [loop]
+    for (uint s = 0u; s < sampleCount; ++s)
+    {
+        float2 uv = StableRectLightSampleUV(s, sampleCount);
+
+        float3 sampleLightPos =
+            Lgt.position +
+            Lgt.axisU * (uv.x * Lgt.halfWidth) +
+            Lgt.axisV * (uv.y * Lgt.halfHeight);
+
+        float3 sampleVec = sampleLightPos - worldPos;
+        float sampleDist = length(sampleVec);
+        if (sampleDist <= 0.01)
+            continue;
+
+        float3 L = sampleVec / sampleDist;
+        float NdotL = ComputeDiffuseLightingTerm(N, L);
+        if (NdotL <= 0.0)
+            continue;
+
+        float faceTerm = (Lgt.twoSided != 0)
+            ? abs(dot(-L, Lgt.normal))
+            : saturate(dot(-L, Lgt.normal));
+
+        if (faceTerm <= 0.0)
+            continue;
+
+        float shadow = 1.0;
+        if (Lgt.samples != 0u)
+            shadow = TraceVisibilityBiased(worldPos, N, L, sampleDist);
+
+        if (Lgt.pointRadiusPad <= 0.5)
+        {
+            specAccum += ComputeSpecular(
+                N,
+                V,
+                L,
+                Lgt.color,
+                Lgt.intensity * faceTerm,
+                1.0,
+                shadow,
+                specularAlbedo) * atten;
+        }
+
+        diffuseAccum += clamp(Lgt.color * (Lgt.intensity * NdotL * faceTerm * atten * shadow), 0.0, 4.0);
+    }
+
+    float invSamples = 1.0 / (float)sampleCount;
+    specularOut = specAccum * invSamples;
+    return diffuseAccum * invSamples;
+}
+
+float HenyeyGreensteinPhase(float cosTheta, float g)
+{
+    g = clamp(g, -0.85, 0.85);
+    float g2 = g * g;
+    float denom = max(1.0 + g2 - 2.0 * g * cosTheta, 1e-3);
+    return (1.0 - g2) / max(4.0 * 3.14159265 * pow(denom, 1.5), 1e-3);
+}
+
+bool IsPointInsideLightVolume(float3 samplePos, Light Lgt)
+{
+    if (Lgt.type == GL_RAYTRACING_LIGHT_TYPE_POINT)
+    {
+        float3 radii = GetPointLightRadius(Lgt);
+        float3 offset = samplePos - Lgt.position;
+
+        float3 axisU = Doom3SafeNormalizeOr(Lgt.axisU, float3(1.0, 0.0, 0.0));
+        float3 axisV = Doom3SafeNormalizeOr(Lgt.axisV, float3(0.0, 1.0, 0.0));
+        float3 axisW = Doom3SafeNormalizeOr(Lgt.normal, float3(0.0, 0.0, 1.0));
+
+        return abs(dot(offset, axisU)) < radii.x &&
+               abs(dot(offset, axisV)) < radii.y &&
+               abs(dot(offset, axisW)) < radii.z;
+    }
+
+    if (Lgt.type == GL_RAYTRACING_LIGHT_TYPE_SPOT)
+    {
+        float3 lightToSample = samplePos - Lgt.position;
+
+        float nearClip = max(Lgt.pointRadius.x, 0.0);
+        float farClip = max(Lgt.radius, nearClip + 1e-4);
+        float3 spotDir = Doom3SafeNormalizeOr(Lgt.normal, float3(0.0, 0.0, 1.0));
+        float depth = dot(lightToSample, spotDir);
+
+        if (depth <= nearClip || depth >= farClip)
+            return false;
+
+        float3 axisU = Doom3SafeNormalizeOr(Lgt.axisU, float3(1.0, 0.0, 0.0));
+        float3 axisV = Doom3SafeNormalizeOr(Lgt.axisV, float3(0.0, 1.0, 0.0));
+        float invDepth = 1.0 / max(depth, 1e-4);
+
+        float signedU = (dot(lightToSample, axisU) * invDepth) / max(abs(Lgt.halfWidth), 1e-4);
+        float signedV = (dot(lightToSample, axisV) * invDepth) / max(abs(Lgt.halfHeight), 1e-4);
+
+        return abs(signedU) < 1.0 && abs(signedV) < 1.0;
+    }
+
+    return false;
+}
+
+float ComputeLightVolumeAttenuation(float3 samplePos, Light Lgt)
+{
+    if (Lgt.type == GL_RAYTRACING_LIGHT_TYPE_POINT)
+        return ComputePointLightAttenuation(samplePos, Lgt);
+
+    if (Lgt.type == GL_RAYTRACING_LIGHT_TYPE_SPOT)
+        return ComputeSpotLightAttenuation(samplePos, Lgt);
+
+    return 0.0;
+}
+
+float EstimateVolumeDensityFromLight(Light Lgt)
+{
+    // Doom 3 world units are large. Tie the default participating-medium density
+    // to light range so the caller only needs one artist-facing attribute.
+    float range = (Lgt.type == GL_RAYTRACING_LIGHT_TYPE_POINT)
+        ? GetPointLightMaxRadius(Lgt)
+        : max(Lgt.radius, 1.0);
+
+    return clamp(2.25 / max(range, 32.0), 0.0015, 0.035);
+}
+)"
+R"(
+float3 EstimateSingleLightVolumetricScattering(uint2 pixel, float3 cameraPos, float3 worldPos, Light Lgt, inout uint rng)
+{
+    if (Lgt.volumetricScattering <= 0.0)
+        return 0.0;
+
+    if (Lgt.type != GL_RAYTRACING_LIGHT_TYPE_POINT && Lgt.type != GL_RAYTRACING_LIGHT_TYPE_SPOT)
+        return 0.0;
+
+    float3 cameraToSurface = worldPos - cameraPos;
+    float viewDist = length(cameraToSurface);
+    if (viewDist <= 0.01)
+        return 0.0;
+
+    float3 viewDir = cameraToSurface / viewDist;
+
+    uint stepCount = (uint)ceil(viewDist / 64.0);
+    stepCount = min(max(stepCount, 8u), 32u);
+    float stepLen = viewDist / (float)stepCount;
+
+    // Do not frame-jitter the march. This renderer has no temporal GI history,
+    // so varying the volume sample positions every frame creates visible sparkle.
+    // A centered deterministic slice is stable and the spatial denoiser can smooth it.
+    float jitter = 0.5;
+
+    float density = EstimateVolumeDensityFromLight(Lgt);
+    float anisotropy = (Lgt.type == GL_RAYTRACING_LIGHT_TYPE_SPOT) ? 0.55 : 0.35;
+
+    float3 accum = 0.0;
+
+    [loop]
+    for (uint s = 0u; s < stepCount; ++s)
+    {
+        float t = ((float)s + jitter) * stepLen;
+        t = min(t, viewDist - 0.001);
+
+        float3 samplePos = cameraPos + viewDir * t;
+        if (!IsPointInsideLightVolume(samplePos, Lgt))
+            continue;
+
+        float3 toLight = Lgt.position - samplePos;
+        float lightDist = length(toLight);
+        if (lightDist <= 0.01)
+            continue;
+
+        float3 L = toLight / lightDist;
+
+        float visibility = 1.0;
+        if (Lgt.samples != 0u)
+        {
+            float3 shadowOrigin = samplePos + L * (gShadowBias * 0.75) + viewDir * (gShadowBias * 0.15);
+            visibility = TraceShadow(shadowOrigin, L, max(lightDist - gShadowBias, 0.001));
+        }
+        if (visibility <= 0.0)
+            continue;
+
+        float atten = ComputeLightVolumeAttenuation(samplePos, Lgt);
+        if (atten <= 0.0)
+            continue;
+
+        float phase = HenyeyGreensteinPhase(dot(L, viewDir), anisotropy);
+        float transmittance = exp(-density * t);
+        float slice = density * stepLen;
+
+        accum += Lgt.color * (Lgt.intensity * atten * visibility * phase * transmittance * slice);
+    }
+
+    // Scale from normalized phase-function energy into a game-facing glow term.
+    // The user-facing light attribute still controls the final strength.
+    const float DOOM3_VOLUME_SCALE = 7.5;
+    return clamp(accum * max(Lgt.volumetricScattering, 0.0) * DOOM3_VOLUME_SCALE, 0.0, 12.0);
+}
+
+float3 EstimatePathTracedVolumetricScattering(uint2 pixel, float3 worldPos, inout uint rng)
+{
+    float3 volume = 0.0;
+
+    [loop]
+    for (uint i = 0; i < gLightCount; ++i)
+    {
+        Light Lgt = gLights[i];
+        if (Lgt.volumetricScattering <= 0.0)
+            continue;
+
+        if (Lgt.type == GL_RAYTRACING_LIGHT_TYPE_POINT || Lgt.type == GL_RAYTRACING_LIGHT_TYPE_SPOT)
+            volume += EstimateSingleLightVolumetricScattering(pixel, gCameraPos.xyz, worldPos, Lgt, rng);
+    }
+
+    return volume;
+}
+)"
+R"(
+float3 EstimateFastBounceLight(float3 hitPos, float3 hitN, Light Lgt)
+{
+    // Cheap unshadowed estimate used as the all-lights baseline for secondary
+    // GI.  A small shadowed subset below corrects this baseline so every light
+    // still bounces, but important occlusion is no longer missing from GI.
+    if (Lgt.type == GL_RAYTRACING_LIGHT_TYPE_POINT)
+    {
+        float3 toLight = Lgt.position - hitPos;
+        float dist = length(toLight);
+        if (dist <= 0.01)
+            return 0.0;
+
+        float3 L = toLight / dist;
+        float atten = ComputePointLightAttenuation(hitPos, Lgt);
+        if (atten <= 0.0)
+            return 0.0;
+
+        float nDotL = ComputeDiffuseLightingTerm(hitN, L);
+        return clamp(Lgt.color * (Lgt.intensity * atten * nDotL), 0.0, 8.0);
+    }
+    else if (Lgt.type == GL_RAYTRACING_LIGHT_TYPE_SPOT)
+    {
+        float3 toLight = Lgt.position - hitPos;
+        float dist = length(toLight);
+        if (dist <= 0.01)
+            return 0.0;
+
+        float3 L = toLight / dist;
+        float atten = ComputeSpotLightAttenuation(hitPos, Lgt);
+        if (atten <= 0.0)
+            return 0.0;
+
+        float nDotL = ComputeDiffuseLightingTerm(hitN, L);
+        return clamp(Lgt.color * (Lgt.intensity * atten * nDotL), 0.0, 8.0);
+    }
+    else if (Lgt.type == GL_RAYTRACING_LIGHT_TYPE_RECT)
+    {
+        float3 toCenter = Lgt.position - hitPos;
+        float centerDist = length(toCenter);
+        if (centerDist <= 0.01)
+            return 0.0;
+
+        float attenRadius = max(Lgt.radius, 1e-4);
+        float atten = saturate((attenRadius - centerDist) / attenRadius);
+        atten = atten * atten;
+        if (atten <= 0.0)
+            return 0.0;
+
+        float3 L = toCenter / centerDist;
+        float nDotL = ComputeDiffuseLightingTerm(hitN, L);
+        if (nDotL <= 0.0)
+            return 0.0;
+
+        float faceTerm = (Lgt.twoSided != 0)
+            ? abs(dot(-L, Lgt.normal))
+            : saturate(dot(-L, Lgt.normal));
+
+        if (faceTerm <= 0.0)
+            return 0.0;
+
+        return clamp(Lgt.color * (Lgt.intensity * nDotL * faceTerm * atten), 0.0, 8.0);
+    }
+
+    return 0.0;
+}
+
+float3 EstimateShadowedBounceLight(uint2 hitPixel, float3 hitPos, float3 hitN, float3 hitV, float3 hitAlbedo, Light Lgt, inout uint rng)
+{
+    float3 spec = 0.0;
+    float3 diffuse = 0.0;
+    float3 hitSpecularAlbedo = LoadSceneSpecularAlbedo(hitPixel, hitAlbedo);
+
+    // Use the same visibility-capable direct-light samplers as the primary hit.
+    // This supplies proper next-event estimation at secondary hits instead of the
+    // old unoccluded light-list approximation.
+    if (Lgt.type == GL_RAYTRACING_LIGHT_TYPE_POINT)
+    {
+        diffuse = PathTraceDirectPointLight(hitPixel, hitPos, hitN, hitV, hitAlbedo, hitSpecularAlbedo, Lgt, rng, spec);
+    }
+    else if (Lgt.type == GL_RAYTRACING_LIGHT_TYPE_SPOT)
+    {
+        diffuse = PathTraceDirectSpotLight(hitPos, hitN, hitV, hitAlbedo, hitSpecularAlbedo, Lgt, rng, spec);
+    }
+    else if (Lgt.type == GL_RAYTRACING_LIGHT_TYPE_RECT)
+    {
+        diffuse = PathTraceDirectRectLight(hitPixel, hitPos, hitN, hitV, hitAlbedo, hitSpecularAlbedo, Lgt, rng, spec);
+    }
+
+    return clamp(diffuse, 0.0, 12.0);
+}
+
+float3 EstimateBounceSkyLighting(float3 hitPos, float3 hitN, inout uint rng)
+{
+    const float SKY_TMAX = 1000000.0;
+
+    uint skySamples = (gSamplesPerPixel >= 4u) ? 2u : 1u;
+    float3 accum = 0.0;
+
+    [loop]
+    for (uint i = 0u; i < skySamples; ++i)
+    {
+        float3 skyDir = (i == 0u)
+            ? SampleConeWorld(GetSkyLightDirection10AM(), 0.18, rng)
+            : SampleCosineWorld(hitN, rng);
+
+        float NoSky = saturate(dot(hitN, skyDir));
+        if (NoSky <= 0.0)
+            continue;
+
+        float visibility = TraceVisibilityBiased(hitPos, hitN, skyDir, SKY_TMAX);
+        accum += GetSkyRadiance(skyDir) * visibility * NoSky;
+    }
+
+    return accum / (float)skySamples;
+}
+
+float3 EstimateDirectLightingForBounceHit(uint2 hitPixel, float3 hitPos, float3 hitN, float3 hitV, float3 hitAlbedo, uint hitGeoFlag, inout uint rng)
+{
+    bool hitIsSkeletal = (hitGeoFlag & GEOMETRY_FLAG_SKELETAL) != 0u;
+    bool hitIsUnlit    = (hitGeoFlag & GEOMETRY_FLAG_UNLIT)    != 0u;
+
+    hitN = SafeNormalizeOr(hitN, float3(0.0, 0.0, 1.0));
+    hitV = SafeNormalizeOr(hitV, -hitN);
+    hitAlbedo = saturate(hitAlbedo);
+
+    // Treat unlit G-buffer surfaces as simple bounce cards.  Glow-map emissive is
+    // intentionally excluded here so visible emissive no longer casts GI/light.
+    if (hitIsUnlit)
+        return clamp(hitAlbedo * 2.0 + GetSkyRadiance(hitN) * 0.04, 0.0, 6.0);
+
+    float upness = saturate(hitN.z * 0.5 + 0.5);
+    float3 lighting = gAmbientColor.rgb * (gAmbientColor.a * 0.035);
+
+    // Real occluded sky contribution at the secondary hit.  The previous GI path
+    // used a fixed sky term, so corners/cavities received too much indirect light.
+    lighting += EstimateBounceSkyLighting(hitPos, hitN, rng) * (0.14 + 0.10 * upness);
+
+    // Glow-map emissive no longer participates in secondary GI. It remains a
+    // direct visible/bloom-only effect until real material-space emissive lighting
+    // is implemented.
+
+    // Baseline: every light contributes to bounced radiance, so small dynamic
+    // lights do not vanish just because they were not chosen by the stochastic
+    // next-event-estimation budget.
+    float3 fastAllLights = 0.0;
+    [loop]
+    for (uint i = 0; i < gLightCount; ++i)
+    {
+        fastAllLights += EstimateFastBounceLight(hitPos, hitN, gLights[i]);
+    }
+    lighting += fastAllLights;
+
+    // Keep secondary light response deterministic. A rotating shadowed-light
+    // correction looked good in stills but caused bright Doom lights to sparkle
+    // badly in GI because only a few lights were corrected each frame.
+
+    //if (hitIsSkeletal)
+    //    lighting *= 1.10;
+
+    // Outgoing diffuse radiance from the bounce surface.  The primary surface's
+    // albedo is applied later in RayGen, so only the secondary hit albedo belongs
+    // here.
+    return clamp(hitAlbedo * max(lighting, 0.0), 0.0, 16.0);
+}
+
+)"
+R"(
+float3 EstimateReactiveScreenSpaceFinalGather(uint2 pixel, float3 worldPos, float3 N, float3 V, float3 baseAlbedo, inout uint rng)
+{
+    // Disabled on purpose. This used to sample nearby camera G-buffer pixels and
+    // was therefore screen-space lighting. Geometry emitters now light the scene
+    // only through the DXR light list and TraceShadow() visibility rays.
+    return 0.0;
+}
+)"
+R"(
+float3 TraceOneIndirectBouncePath(uint2 pixel, float3 worldPos, float3 N, float3 V, float3 baseAlbedo, inout uint rng)
+{
+    // Disabled until this renderer has real per-hit material/emissive buffers in
+    // the SBT. The old implementation traced a ray, then projected the hit back
+    // into the current camera G-buffer with the current camera G-buffer, which made
+    // indirect light depend on what was visible on screen. Direct area lighting
+    // below is still fully ray traced through the TLAS.
+    return 0.0;
+}
+
+float3 EstimatePathTracedIndirectBounce(uint2 pixel, float3 worldPos, float3 N, float3 V, float3 baseAlbedo, inout uint rng)
+{
+    // No screen-space material fallback and no stochastic diffuse GI in the fast
+    // geometry-emitter path. Area lights are evaluated by PathTraceDirect* with
+    // DXR visibility rays.
+    return 0.0;
+}
+
+float3 ApplyPrimaryDiffusePost(float3 lightingAccum, float ao, float microShadow, bool isSkeletal)
+{
+    if (isSkeletal)
+    {
+        ao = lerp(ao, 1.0, 0.35);
+        microShadow = lerp(microShadow, 1.0, 0.65);
+    }
+
+    lightingAccum *= ao;
+    lightingAccum *= microShadow;
+
+    //if (isSkeletal)
+    //    lightingAccum *= 1.2;
+
+    return max(lightingAccum, 0.0);
+}
+
+float3 ApplyPrimarySpecularPost(float3 specularAccum, float ao, bool isSkeletal)
+{
+    // AO is a diffuse/ambient visibility term here.  Multiplying specular by AO
+    // directly made highlights disappear on creases, props, and normal-mapped
+    // surfaces.  Keep a mild occlusion tint, but let direct-light specular read.
+    float specAo = lerp(0.58, 1.0, saturate(ao));
+    if (isSkeletal)
+        specAo = lerp(specAo, 1.0, 0.50);
+    specularAccum *= specAo;
+
+    //if (isSkeletal)
+     //   specularAccum *= 1.15;
+
+    return max(specularAccum, 0.0);
+}
+
+float3 PathTraceDeterministicLighting(
+    uint2 pixel,
+    float3 worldPos,
+    float3 N,
+    float3 V,
+    float3 baseAlbedo,
+    float3 specularAlbedo,
+    bool isSkeletal,
+    float cavity,
+    float ao,
+    float skyVis,
+    float ambientSkyVis,
+    out float3 specularAccum)
+{
+    specularAccum = 0.0;
+
+    float microShadow = 1.0;
+
+    // These environment and direct-light terms are deterministic for a given
+    // pixel.  The old RayGen evaluated them once for every SPP, which multiplied
+    // the AO/sky/direct shadow ray budget without adding new samples.
+    float upness = saturate(N.z * 0.5 + 0.5);
+    float3 skyColorRGB = float3(0.98, 0.55, 0.35);
+    float3 skyColor = skyColorRGB * (0.35 + 0.65 * upness);
+
+    float3 lightingAccum = gAmbientColor.rgb * (gAmbientColor.a * 0.04);
+    lightingAccum += skyColor * (0.42 * skyVis);
+    lightingAccum += ambientSkyVis * (skyColorRGB * 0.12);
+
+    // Glow-map emissive is direct/bloom-only for now. It is added after lighting
+    // in RayGen and is intentionally not injected into lightingAccum.
+
+    //if (isSkeletal)
+    //    lightingAccum += 0.1;
+
+    // The current direct-light evaluators are deterministic.  Keep the inout RNG
+    // argument only because the functions share the same signature as stochastic
+    // helpers; it is not consumed by PathTraceDirect* in the current shader.
+    uint directRng = InitRng(pixel, 0u, 0xD17EC7u);
+
+    [loop]
+    for (uint i = 0; i < gLightCount; ++i)
+    {
+        Light Lgt = gLights[i];
+        float3 spec = 0.0;
+        float3 diffuse = 0.0;
+
+        if (Lgt.type == GL_RAYTRACING_LIGHT_TYPE_POINT)
+        {
+            diffuse = PathTraceDirectPointLight(pixel, worldPos, N, V, baseAlbedo, specularAlbedo, Lgt, directRng, spec);
+        }
+        else if (Lgt.type == GL_RAYTRACING_LIGHT_TYPE_SPOT)
+        {
+            diffuse = PathTraceDirectSpotLight(worldPos, N, V, baseAlbedo, specularAlbedo, Lgt, directRng, spec);
+        }
+        else if (Lgt.type == GL_RAYTRACING_LIGHT_TYPE_RECT)
+        {
+            diffuse = PathTraceDirectRectLight(pixel, worldPos, N, V, baseAlbedo, specularAlbedo, Lgt, directRng, spec);
+        }
+
+        lightingAccum += diffuse;
+        specularAccum += spec;
+    }
+
+    specularAccum = ApplyPrimarySpecularPost(specularAccum, ao, isSkeletal);
+    return ApplyPrimaryDiffusePost(lightingAccum, ao, microShadow, isSkeletal);
+}
+
+
+float3 EstimateFallbackReflectionHitRadiance(float3 hitPos, float3 hitNormal, float3 incomingViewDir)
+{
+    // Reflection rays can hit off-screen or camera-hidden TLAS geometry.  In that
+    // case this pass has no per-triangle material/normal table, so use a neutral
+    // lit card instead of returning black.  This keeps reflected objects visible
+    // without pretending every unknown hit is a perfect emissive surface.
+    incomingViewDir = SafeNormalizeOr(incomingViewDir, -hitNormal);
+    hitNormal = SafeNormalizeOr(hitNormal, incomingViewDir);
+
+    if (dot(hitNormal, incomingViewDir) < 0.0)
+        hitNormal = -hitNormal;
+
+    float upness = saturate(hitNormal.z * 0.5 + 0.5);
+    float3 lighting = gAmbientColor.rgb * (gAmbientColor.a * 0.035);
+    lighting += GetSkyRadiance(hitNormal) * (0.12 + 0.08 * upness);
+    lighting += GetSkyRadiance(SafeNormalizeOr(reflect(-incomingViewDir, hitNormal), hitNormal)) * 0.055;
+
+    [loop]
+    for (uint i = 0; i < gLightCount; ++i)
+    {
+        lighting += EstimateFastBounceLight(hitPos, hitNormal, gLights[i]) * 0.78;
+    }
+
+    const float3 NEUTRAL_UNKNOWN_ALBEDO = float3(0.58, 0.58, 0.58);
+    return clamp(NEUTRAL_UNKNOWN_ALBEDO * max(lighting, 0.0), 0.0, 10.0);
+}
+
+
+float ComputeSpecularReflectionLocalEnergy(float3 worldPos, float3 N)
+{
+    float energy = 0.0;
+
+    [loop]
+    for (uint i = 0; i < gLightCount; ++i)
+    {
+        Light Lgt = gLights[i];
+
+        float atten = 0.0;
+
+        if (Lgt.type == GL_RAYTRACING_LIGHT_TYPE_POINT)
+        {
+            atten = ComputePointLightAttenuation(worldPos, Lgt);
+        }
+        else if (Lgt.type == GL_RAYTRACING_LIGHT_TYPE_SPOT)
+        {
+            atten = ComputeSpotLightAttenuation(worldPos, Lgt);
+        }
+        else if (Lgt.type == GL_RAYTRACING_LIGHT_TYPE_RECT)
+        {
+            float dist = length(Lgt.position - worldPos);
+            float range = max(Lgt.radius, 1.0);
+            atten = saturate((range - dist) / range);
+            atten = atten * atten;
+        }
+
+        if (atten <= 0.0)
+            continue;
+
+        float3 toLight = SafeNormalizeOr(Lgt.position - worldPos, N);
+        float facing = saturate(dot(N, toLight));
+        float lightPeak = max(max(Lgt.color.r, Lgt.color.g), Lgt.color.b);
+
+        energy += atten * facing * Lgt.intensity * lightPeak;
+    }
+
+    // Keep reflections tied to nearby light contribution instead of becoming
+    // a global mirror pass.
+    return saturate(energy * 0.08);
+}
+
+float ComputeSpecularReflectionMaxDistance(float3 worldPos)
+{
+    float maxDistance = 0.0;
+
+    [loop]
+    for (uint i = 0; i < gLightCount; ++i)
+    {
+        Light Lgt = gLights[i];
+
+        float atten = 0.0;
+        float range = 0.0;
+
+        if (Lgt.type == GL_RAYTRACING_LIGHT_TYPE_POINT)
+        {
+            atten = ComputePointLightAttenuation(worldPos, Lgt);
+            range = GetPointLightMaxRadius(Lgt);
+        }
+        else if (Lgt.type == GL_RAYTRACING_LIGHT_TYPE_SPOT)
+        {
+            atten = ComputeSpotLightAttenuation(worldPos, Lgt);
+            range = max(Lgt.radius, 1.0);
+        }
+        else if (Lgt.type == GL_RAYTRACING_LIGHT_TYPE_RECT)
+        {
+            float dist = length(Lgt.position - worldPos);
+            range = max(Lgt.radius, 1.0);
+            atten = saturate((range - dist) / range);
+            atten = atten * atten;
+        }
+
+        if (atten <= 0.0)
+            continue;
+
+        // Reflections should not reach the full light range like a mirror.
+        // This makes the reflection proportional to local light influence.
+        maxDistance = max(maxDistance, range * lerp(0.18, 0.55, saturate(atten)));
+    }
+
+    return clamp(maxDistance, 24.0, 768.0);
+}
+
+float ComputeSpecularReflectionDistanceFade(float hitT, float maxT)
+{
+    float t = saturate(hitT / max(maxT, 1.0));
+
+    // Strong near reflection, smooth fade before the end of the local volume.
+    float fade = 1.0 - smoothstep(0.35, 1.0, t);
+
+    return fade * fade;
+}
+
+float3 EstimateRayTracedSpecularReflection(
+    uint2 pixel,
+    float3 worldPos,
+    float3 N,
+    float3 V,
+    float3 baseAlbedo,
+    float3 specularAlbedo,
+    float cavity,
+    inout uint rng)
+{
+    // Disabled for now. The previous reflection path traced TLAS hits but then
+    // used the camera G-buffer to fetch off-screen material data, which is a
+    // screen-space approximation and very expensive. Direct specular from real
+    // lights is still computed in PathTraceDeterministicLighting().
+    return 0.0;
+}
+)"
+R"(
+float3 ApplyRealisticOutputCurve(float3 color)
+{
+    // Final photographic shoulder only: it does not change light radius or
+    // attenuation, but it prevents intense local lights/specular/bloom from
+    // clipping into a flat white patch. Values below 1.0 are left untouched.
+    color = max(color, 0.0);
+
+    float peak = max(max(color.r, color.g), color.b);
+    if (peak > 1.0)
+    {
+        float over = peak - 1.0;
+        float shoulderPeak = 1.0 + over / (1.0 + over * 0.38);
+        color *= shoulderPeak / max(peak, 1.0e-5);
+    }
+
+    return max(color, 0.0);
+}
+
+[shader("raygeneration")]
+void RayGen()
+{
+    uint2 pixel = DispatchRaysIndex().xy;
+
+    if (pixel.x >= (uint)gScreenSize.x || pixel.y >= (uint)gScreenSize.y)
+        return;
+
+    float4 albedoSample = gAlbedoTex.Load(int3(pixel, 0));
+    float4 emissiveSample = gEmissiveTex.Load(int3(pixel, 0));
+    float3 emissiveSurface = CompressEmissiveRadiance(emissiveSample.rgb, 6.50);
+    float depthSample   = gDepthTex.Load(int3(pixel, 0));
+
+    float3 emissiveBloom = EstimateEmissiveBloomAtPixel(pixel);
+
+    if (depthSample <= 0.0 || depthSample >= 1.0)
+    {
+        gOutputTex[pixel] = float4(ApplyRealisticOutputCurve(albedoSample.rgb + emissiveSurface + emissiveBloom), albedoSample.a);
+        return;
+    }
+
+    float3 baseAlbedo     = albedoSample.rgb;
+    float3 specularAlbedo = LoadSceneSpecularAlbedo(pixel, baseAlbedo);
+    float4 positionSample = gPositionTex.Load(int3(pixel, 0));
+    float3 worldPos       = positionSample.xyz;
+    uint geoFlag = DecodeGeometryFlag(positionSample.w);
+    bool isSkeletal = (geoFlag & GEOMETRY_FLAG_SKELETAL) != 0u;
+    bool isUnlit    = (geoFlag & GEOMETRY_FLAG_UNLIT)    != 0u;
+    float4 normalSample   = LoadSceneNormal(pixel);
+    float3 N              = EnhanceBumpNormal(pixel, worldPos, baseAlbedo, isSkeletal);
+    float3 V              = normalize(gCameraPos.xyz - worldPos);
+
+    if (isUnlit)
+    {
+        gOutputTex[pixel] = float4(ApplyRealisticOutputCurve(baseAlbedo + emissiveSurface + emissiveBloom), albedoSample.a);
+        return;
+    }
+
+    uint spp = max(gSamplesPerPixel, 1u);
+    spp = min(spp, 8u);
+
+    // All four of these are deterministic for this pixel.  Compute them once,
+    // then reuse them for every stochastic GI sample.
+    float cavity = 1.0; // screen-space cavity disabled for ray-traced-only lighting
+    float ao = 1.0; // expensive ray AO disabled in the fast area-light path
+    float skyVis = 0; //ComputeSkyVisibility(worldPos, N, pixel);
+    float ambientSkyVis = 0; //TraceStraightUpToSky(worldPos, N);
+    float microShadow = 1.0;
+    // Screen-space final gather is disabled. Geometry emitters illuminate only
+    // through the DXR rect-light path below.
+    float3 reactiveFinalGather = 0.0;
+    float3 specularAccum = 0.0;
+    float3 lightingAccum = PathTraceDeterministicLighting(
+        pixel,
+        worldPos,
+        N,
+        V,
+        baseAlbedo,
+        specularAlbedo,
+        isSkeletal,
+        cavity,
+        ao,
+        skyVis,
+        ambientSkyVis,
+        specularAccum);
+    lightingAccum += EstimateScreenSpaceEmissiveParticleLighting(pixel, worldPos, N);
+    // No stochastic indirect bounce in this fast path. The area emitters are
+    // sampled as true rect lights with DXR shadow rays in the direct-light loop.
+    float3 reflectedSpecular = 0.0;
+    float3 albedo = baseAlbedo * cavity;
+    float3 finalColor = (albedo * lightingAccum) + specularAccum + reflectedSpecular;
+    finalColor += reactiveFinalGather;
+    float outputAo = isSkeletal ? lerp(ao, 1.0, 0.55) : ao;
+	finalColor *= clamp(outputAo + 0.6, 0.0, 1.0);
+
+    // Volumetric light scattering is radiance in the camera ray, not surface
+    // reflectance, so add it after surface albedo/specular composition.  Because
+    // it is written into the same path-trace target, the internal a-trous pass
+    // denoises the stochastic volume/GI signal together with the rest of the ray result.
+    uint volumeRng = InitRng(pixel, 0u, 0x51u);
+    finalColor += EstimatePathTracedVolumetricScattering(pixel, worldPos, volumeRng);
+
+    // Visible self-emission from the primary surface. Screen-space particle
+    // emissive lighting was already injected into lightingAccum above.
+    finalColor += emissiveSurface + emissiveBloom;
+
+    gOutputTex[pixel] = float4(ApplyRealisticOutputCurve(finalColor), albedoSample.a);
+}
+)";
+
+static const char* g_glRaytracingDenoiseHlsl = R"(
+cbuffer LightingCB : register(b0)
+{
+    float4x4 gInvViewProj;
+    float4x4 gInvViewMatrix;
+    float4x4 gViewProj;
+    float4   gCameraPos;
+    float4   gAmbientColor;
+    float4   gScreenSize;
+    float    gNormalReconstructZ;
+    uint     gLightCount;
+    uint     gEnableSpecular;
+    uint     gEnableHalfLambert;
+    float    gShadowBias;
+    uint     gFrameIndex;
+    uint     gSamplesPerPixel;
+    uint     gMaxBounces;
+    uint     gEnableDenoiser;
+    uint     gDenoisePassIndex;
+    float    gDenoiseStepWidth;
+    float    gDenoiseStrength;
+    float    gDenoisePhiColor;
+    float    gDenoisePhiNormal;
+    float    gDenoisePhiPosition;
+    float    gBumpStrength;
+};
+
+Texture2D<float4> gAlbedoTex      : register(t1);
+Texture2D<float>  gDepthTex       : register(t2);
+Texture2D<float4> gNormalTex      : register(t3);
+Texture2D<float4> gPositionTex    : register(t4);
+Texture2D<float4> gPathTraceTex   : register(t6);
+Texture2D<float4> gDenoiseATex    : register(t7);
+Texture2D<float4> gDenoiseBTex    : register(t8);
+Texture2D<float4> gTemporalTex    : register(t10);
+
+RWTexture2D<float4> gRayOutputTex      : register(u0);
+RWTexture2D<float4> gDenoiseAOutTex    : register(u1);
+RWTexture2D<float4> gDenoiseBOutTex    : register(u2);
+RWTexture2D<float4> gDenoisedOutputTex : register(u3);
+
+static const float kKernel[5] = { 0.0625, 0.25, 0.375, 0.25, 0.0625 };
+
+float3 SafeNormal(float3 n)
+{
+    float lenSq = max(dot(n, n), 1e-8);
+    return n * rsqrt(lenSq);
+}
+
+float Luminance(float3 c)
+{
+    return dot(c, float3(0.2126, 0.7152, 0.0722));
+}
+
+static const uint GEOMETRY_FLAG_GLASS = 4u;
+
+uint DecodeGeometryFlag(float geoFlag)
+{
+    return (uint)floor(max(geoFlag, 0.0) + 0.5);
+}
+
+float3 SafeAlbedoDivisor(float3 albedo)
+{
+    // Do not let black/dark textures explode when demodulating noisy lighting.
+    return max(abs(albedo), float3(0.06, 0.06, 0.06));
+}
+
+float3 DemodulateLighting(float3 radiance, float3 albedo)
+{
+    return radiance / SafeAlbedoDivisor(albedo);
+}
+
+float3 RemodulateLighting(float3 lighting, float3 albedo)
+{
+    return lighting * SafeAlbedoDivisor(albedo);
+}
+
+float4 LoadDenoiseSource(int2 p)
+{
+    if (gDenoisePassIndex == 0u)
+        return gTemporalTex.Load(int3(p, 0));
+    if (gDenoisePassIndex == 1u)
+        return gDenoiseATex.Load(int3(p, 0));
+    return gDenoiseBTex.Load(int3(p, 0));
+}
+
+void StoreDenoiseOutput(uint2 p, float4 v)
+{
+    if (gDenoisePassIndex == 0u)
+        gDenoiseAOutTex[p] = v;
+    else if (gDenoisePassIndex == 1u)
+        gDenoiseBOutTex[p] = v;
+    else
+        gDenoisedOutputTex[p] = v;
+}
+
+float GeometryAwareWeight(
+    float3 centerRadiance,
+    float3 sampleRadiance,
+    float3 centerAlbedo,
+    float3 sampleAlbedo,
+    float3 centerNormal,
+    float3 sampleNormal,
+    float3 centerPos,
+    float3 samplePos,
+    float centerDepth,
+    float sampleDepth,
+    uint centerGeoFlag,
+    uint sampleGeoFlag,
+    float kernelWeight)
+{
+    if (sampleDepth <= 0.0 || sampleDepth >= 1.0)
+        return 0.0;
+
+    // Do not smear lighting across material-class boundaries.  This is
+    // particularly important for glass, because the primary G-buffer sample can
+    // be glass while the ray visibility must continue through it.
+    if (((centerGeoFlag ^ sampleGeoFlag) & GEOMETRY_FLAG_GLASS) != 0u)
+        return 0.0;
+
+    float3 centerLighting = DemodulateLighting(centerRadiance, centerAlbedo);
+    float3 sampleLighting = DemodulateLighting(sampleRadiance, sampleAlbedo);
+
+    // Use albedo, not noisy lit radiance, as the main color edge guide.  The
+    // previous filter used the shadowed/noisy signal itself as the guide, which
+    // rejected neighbors across shadow variation and left shadow noise intact.
+    float albedoDiff = length(centerAlbedo - sampleAlbedo);
+    float albedoWeight = exp(-albedoDiff * max(gDenoisePhiColor, 0.001));
+
+    // A deliberately soft lighting-domain gate keeps hard contact-shadow edges
+    // from being over-blurred, but still lets noisy penumbra/visibility samples
+    // converge across the same surface.
+    float centerLum = Luminance(centerLighting);
+    float sampleLum = Luminance(sampleLighting);
+    float illumDiff = abs(sampleLum - centerLum);
+    float relativeIllumDiff = illumDiff / max(max(abs(centerLum), abs(sampleLum)), 0.05);
+
+    // Keep this gate conservative. The noise fix is to stabilize and stratify the
+    // ray samples; over-loosening this filter smears direct lighting and makes the
+    // scene look noisier/blotchier.
+    float illuminationWeight = exp(-relativeIllumDiff * max(gDenoisePhiColor * 0.035, 0.10));
+
+    float normalWeight = pow(saturate(dot(centerNormal, sampleNormal)), max(gDenoisePhiNormal, 1.0));
+    float positionDiff = length(samplePos - centerPos);
+    float positionWeight = exp(-positionDiff * max(gDenoisePhiPosition, 0.001));
+    float depthDiff = abs(sampleDepth - centerDepth);
+    float depthWeight = exp(-depthDiff * 300.0);
+
+    return kernelWeight * albedoWeight * illuminationWeight * normalWeight * positionWeight * depthWeight;
+}
+
+[numthreads(8, 8, 1)]
+void DenoiseCS(uint3 dispatchThreadId : SV_DispatchThreadID)
+{
+    uint2 pixel = dispatchThreadId.xy;
+
+    if (pixel.x >= (uint)gScreenSize.x || pixel.y >= (uint)gScreenSize.y)
+        return;
+
+    float4 albedoSample = gAlbedoTex.Load(int3(pixel, 0));
+    float depthSample = gDepthTex.Load(int3(pixel, 0));
+    float4 centerSource = LoadDenoiseSource(int2(pixel));
+
+    if (depthSample <= 0.0 || depthSample >= 1.0)
+    {
+        // Preserve raygen's emissive bloom on background/no-depth pixels.
+        // Returning albedo here would erase the halo whenever the internal
+        // temporal/a-trous denoiser is active.
+        StoreDenoiseOutput(pixel, centerSource);
+        return;
+    }
+
+    if (gEnableDenoiser == 0u)
+    {
+        StoreDenoiseOutput(pixel, centerSource);
+        return;
+    }
+
+    float3 centerAlbedo = saturate(albedoSample.rgb);
+    float3 centerNormal = SafeNormal(gNormalTex.Load(int3(pixel, 0)).xyz);
+    float4 centerPos4 = gPositionTex.Load(int3(pixel, 0));
+    float3 centerPos = centerPos4.xyz;
+    uint centerGeoFlag = DecodeGeometryFlag(centerPos4.w);
+
+    int stepI = max((int)round(max(gDenoiseStepWidth, 1.0)), 1);
+    float3 accumLighting = 0.0;
+    float weightSum = 0.0;
+
+    // Three-pass a-trous wavelet filter. The CPU dispatches this with step
+    // widths 1, 2, and 4. It is geometry-aware; temporal GI accumulation happens
+    // before this pass.
+    [unroll]
+    for (int ky = 0; ky < 5; ++ky)
+    {
+        [unroll]
+        for (int kx = 0; kx < 5; ++kx)
+        {
+            int2 sp = int2(pixel) + int2(kx - 2, ky - 2) * stepI;
+
+            if (sp.x < 0 || sp.y < 0 || sp.x >= (int)gScreenSize.x || sp.y >= (int)gScreenSize.y)
+                continue;
+
+            float sampleDepth = gDepthTex.Load(int3(sp, 0));
+            float4 sampleColor4 = LoadDenoiseSource(sp);
+            float3 sampleAlbedo = saturate(gAlbedoTex.Load(int3(sp, 0)).rgb);
+            float3 sampleNormal = SafeNormal(gNormalTex.Load(int3(sp, 0)).xyz);
+            float4 samplePos4 = gPositionTex.Load(int3(sp, 0));
+            float3 samplePos = samplePos4.xyz;
+            uint sampleGeoFlag = DecodeGeometryFlag(samplePos4.w);
+            float kernelWeight = kKernel[kx] * kKernel[ky];
+
+            float w = GeometryAwareWeight(
+                centerSource.rgb,
+                sampleColor4.rgb,
+                centerAlbedo,
+                sampleAlbedo,
+                centerNormal,
+                sampleNormal,
+                centerPos,
+                samplePos,
+                depthSample,
+                sampleDepth,
+                centerGeoFlag,
+                sampleGeoFlag,
+                kernelWeight);
+
+            accumLighting += DemodulateLighting(sampleColor4.rgb, sampleAlbedo) * w;
+            weightSum += w;
+        }
+    }
+
+    float3 filteredLighting = (weightSum > 1e-6)
+        ? (accumLighting / weightSum)
+        : DemodulateLighting(centerSource.rgb, centerAlbedo);
+
+    float3 filtered = RemodulateLighting(filteredLighting, centerAlbedo);
+
+    // Final-pass firefly clamp against the raw neighborhood.
+    if (gDenoisePassIndex >= 2u)
+    {
+        float3 minRaw = gPathTraceTex.Load(int3(pixel, 0)).rgb;
+        float3 maxRaw = minRaw;
+
+        [unroll]
+        for (int y = -1; y <= 1; ++y)
+        {
+            [unroll]
+            for (int x = -1; x <= 1; ++x)
+            {
+                int2 sp = int2(pixel) + int2(x, y);
+                if (sp.x < 0 || sp.y < 0 || sp.x >= (int)gScreenSize.x || sp.y >= (int)gScreenSize.y)
+                    continue;
+                float3 raw = gPathTraceTex.Load(int3(sp, 0)).rgb;
+                minRaw = min(minRaw, raw);
+                maxRaw = max(maxRaw, raw);
+            }
+        }
+
+        // Keep the clamp tight. A wide clamp lets bright stochastic GI/volume
+        // outliers survive and was the main reason the previous patch looked worse.
+        filtered = clamp(filtered, minRaw - 0.15, maxRaw + 0.15);
+    }
+
+    float3 outColor = lerp(centerSource.rgb, filtered, saturate(gDenoiseStrength));
+    StoreDenoiseOutput(pixel, float4(max(outColor, 0.0), centerSource.a));
+}
+)";
+
+
+static const char* g_glRaytracingTemporalHlsl = R"(
+cbuffer LightingCB : register(b0)
+{
+    float4x4 gInvViewProj;
+    float4x4 gInvViewMatrix;
+    float4x4 gViewProj;
+    float4   gCameraPos;
+    float4   gAmbientColor;
+    float4   gScreenSize;
+    float    gNormalReconstructZ;
+    uint     gLightCount;
+    uint     gEnableSpecular;
+    uint     gEnableHalfLambert;
+    float    gShadowBias;
+    uint     gFrameIndex;
+    uint     gSamplesPerPixel;
+    uint     gMaxBounces;
+    uint     gEnableDenoiser;
+    uint     gDenoisePassIndex;
+    float    gDenoiseStepWidth;
+    float    gDenoiseStrength;
+    float    gDenoisePhiColor;
+    float    gDenoisePhiNormal;
+    float    gDenoisePhiPosition;
+    float    gBumpStrength;
+};
+
+Texture2D<float4> gAlbedoTex    : register(t1);
+Texture2D<float>  gDepthTex     : register(t2);
+Texture2D<float4> gNormalTex    : register(t3);
+Texture2D<float4> gPositionTex  : register(t4);
+Texture2D<float4> gPathTraceTex : register(t6);
+Texture2D<float4> gHistoryTex   : register(t9);
+
+RWTexture2D<float4> gTemporalOutTex : register(u4);
+RWTexture2D<float4> gHistoryOutTex  : register(u5);
+
+float LuminanceTemporal(float3 c)
+{
+    return dot(c, float3(0.2126, 0.7152, 0.0722));
+}
+
+float3 SafeNormalTemporal(float3 n)
+{
+    float lenSq = max(dot(n, n), 1e-8);
+    return n * rsqrt(lenSq);
+}
+
+float3 ClampHistoryToCurrent(float3 history, float3 current)
+{
+    // Loose temporal clamp: it removes GI fireflies and old lighting while still
+    // allowing bright muzzle-flash/door-light changes to appear in a few frames.
+    float3 radius = 0.20 + abs(current) * 0.55;
+    return clamp(history, current - radius, current + radius);
+}
+
+[numthreads(8, 8, 1)]
+void TemporalAccumCS(uint3 dispatchThreadId : SV_DispatchThreadID)
+{
+    uint2 pixel = dispatchThreadId.xy;
+
+    if (pixel.x >= (uint)gScreenSize.x || pixel.y >= (uint)gScreenSize.y)
+        return;
+
+    float4 raw = gPathTraceTex.Load(int3(pixel, 0));
+    float depth = gDepthTex.Load(int3(pixel, 0));
+
+    if (depth <= 0.0 || depth >= 1.0 || gMaxBounces <= 1u)
+    {
+        gTemporalOutTex[pixel] = raw;
+        gHistoryOutTex[pixel] = float4(raw.rgb, 0.0);
+        return;
+    }
+
+    float4 history = gHistoryTex.Load(int3(pixel, 0));
+    float historyCount = (gFrameIndex == 0u) ? 0.0 : clamp(history.a, 0.0, 31.0);
+
+    if (historyCount <= 0.0)
+    {
+        gTemporalOutTex[pixel] = raw;
+        gHistoryOutTex[pixel] = float4(raw.rgb, 1.0);
+        return;
+    }
+
+    float3 historyColor = ClampHistoryToCurrent(max(history.rgb, 0.0), max(raw.rgb, 0.0));
+
+    float rawLum = LuminanceTemporal(max(raw.rgb, 0.0));
+    float histLum = LuminanceTemporal(historyColor);
+    float relChange = abs(rawLum - histLum) / max(max(rawLum, histLum), 0.08);
+
+    // Base accumulation approaches 32 frames, but large lighting changes raise
+    // current-frame weight so the accumulator does not leave obvious trails.
+    float currentWeight = max(1.0 / (historyCount + 1.0), 0.055);
+    currentWeight = max(currentWeight, saturate(relChange * 0.28));
+    currentWeight = saturate(currentWeight);
+
+    float3 resolved = lerp(historyColor, max(raw.rgb, 0.0), currentWeight);
+    float nextCount = min(historyCount + 1.0, 31.0);
+
+    gTemporalOutTex[pixel] = float4(resolved, raw.a);
+    gHistoryOutTex[pixel] = float4(resolved, nextCount);
+}
+)";
+
+static ComPtr<IDxcBlob> glRaytracingLightingCompileLibrary(const char* src)
+{
+	ComPtr<IDxcUtils> utils;
+	ComPtr<IDxcCompiler3> compiler;
+	ComPtr<IDxcIncludeHandler> includeHandler;
+
+	HRESULT hr = DxcCreateInstance(CLSID_DxcUtils, IID_PPV_ARGS(&utils));
+	if (FAILED(hr))
+	{
+		glRaytracingFatal("DxcCreateInstance utils failed 0x%08X", (unsigned)hr);
+		return nullptr;
+	}
+
+	hr = DxcCreateInstance(CLSID_DxcCompiler, IID_PPV_ARGS(&compiler));
+	if (FAILED(hr))
+	{
+		glRaytracingFatal("DxcCreateInstance compiler failed 0x%08X", (unsigned)hr);
+		return nullptr;
+	}
+
+	hr = utils->CreateDefaultIncludeHandler(&includeHandler);
+	if (FAILED(hr))
+	{
+		glRaytracingFatal("CreateDefaultIncludeHandler failed 0x%08X", (unsigned)hr);
+		return nullptr;
+	}
+
+	DxcBuffer source = {};
+	source.Ptr = src;
+	source.Size = strlen(src);
+	source.Encoding = DXC_CP_UTF8;
+
+	const wchar_t* args[] =
+	{
+		L"-T", L"lib_6_3",
+#if defined(_DEBUG)
+		L"-Zi",
+		L"-Qembed_debug",
+#endif
+		// Keep the DXR library smaller to avoid long driver-side linking during
+		// CreateStateObject(). Compute/post shaders below still compile with O3.
+		L"-O1",
+		L"-all_resources_bound"
+	};
+
+	ComPtr<IDxcResult> result;
+	hr = compiler->Compile(&source, args, _countof(args), includeHandler.Get(), IID_PPV_ARGS(&result));
+	if (FAILED(hr))
+	{
+		glRaytracingFatal("DXC compile failed 0x%08X", (unsigned)hr);
+		return nullptr;
+	}
+
+	ComPtr<IDxcBlobUtf8> errors;
+	result->GetOutput(DXC_OUT_ERRORS, IID_PPV_ARGS(&errors), nullptr);
+	if (errors && errors->GetStringLength() > 0)
+	{
+		OutputDebugStringA(errors->GetStringPointer());
+		OutputDebugStringA("\n");
+	}
+
+	HRESULT status = S_OK;
+	result->GetStatus(&status);
+	if (FAILED(status))
+	{
+		glRaytracingFatal("DXIL compile status failed 0x%08X", (unsigned)status);
+		return nullptr;
+	}
+
+	ComPtr<IDxcBlob> dxil;
+	result->GetOutput(DXC_OUT_OBJECT, IID_PPV_ARGS(&dxil), nullptr);
+	return dxil;
+}
+
+static ComPtr<IDxcBlob> glRaytracingLightingCompileCompute(const char* src, const wchar_t* entryPoint)
+{
+	ComPtr<IDxcUtils> utils;
+	ComPtr<IDxcCompiler3> compiler;
+	ComPtr<IDxcIncludeHandler> includeHandler;
+
+	HRESULT hr = DxcCreateInstance(CLSID_DxcUtils, IID_PPV_ARGS(&utils));
+	if (FAILED(hr))
+	{
+		glRaytracingFatal("DxcCreateInstance utils failed 0x%08X", (unsigned)hr);
+		return nullptr;
+	}
+
+	hr = DxcCreateInstance(CLSID_DxcCompiler, IID_PPV_ARGS(&compiler));
+	if (FAILED(hr))
+	{
+		glRaytracingFatal("DxcCreateInstance compiler failed 0x%08X", (unsigned)hr);
+		return nullptr;
+	}
+
+	hr = utils->CreateDefaultIncludeHandler(&includeHandler);
+	if (FAILED(hr))
+	{
+		glRaytracingFatal("CreateDefaultIncludeHandler failed 0x%08X", (unsigned)hr);
+		return nullptr;
+	}
+
+	DxcBuffer source = {};
+	source.Ptr = src;
+	source.Size = strlen(src);
+	source.Encoding = DXC_CP_UTF8;
+
+	const wchar_t* args[] =
+	{
+		L"-E", entryPoint,
+		L"-T", L"cs_6_0",
+#if defined(_DEBUG)
+		L"-Zi",
+		L"-Qembed_debug",
+#endif
+		L"-O3",
+		L"-all_resources_bound"
+	};
+
+	ComPtr<IDxcResult> result;
+	hr = compiler->Compile(&source, args, _countof(args), includeHandler.Get(), IID_PPV_ARGS(&result));
+	if (FAILED(hr))
+	{
+		glRaytracingFatal("DXC compute compile failed 0x%08X", (unsigned)hr);
+		return nullptr;
+	}
+
+	ComPtr<IDxcBlobUtf8> errors;
+	result->GetOutput(DXC_OUT_ERRORS, IID_PPV_ARGS(&errors), nullptr);
+	if (errors && errors->GetStringLength() > 0)
+	{
+		OutputDebugStringA(errors->GetStringPointer());
+		OutputDebugStringA("\n");
+	}
+
+	HRESULT status = S_OK;
+	result->GetStatus(&status);
+	if (FAILED(status))
+	{
+		glRaytracingFatal("DXIL compute compile status failed 0x%08X", (unsigned)status);
+		return nullptr;
+	}
+
+	ComPtr<IDxcBlob> dxil;
+	result->GetOutput(DXC_OUT_OBJECT, IID_PPV_ARGS(&dxil), nullptr);
+	return dxil;
+}
+
+static int glRaytracingLightingCreateDescriptorHeap(void)
+{
+	D3D12_DESCRIPTOR_HEAP_DESC hd = {};
+	hd.NumDescriptors = GLR_DESC_COUNT;
+	hd.Type = D3D12_DESCRIPTOR_HEAP_TYPE_CBV_SRV_UAV;
+	hd.Flags = D3D12_DESCRIPTOR_HEAP_FLAG_SHADER_VISIBLE;
+
+	for (UINT frame = 0; frame < GL_RAYTRACING_CMD_RING_SIZE; ++frame)
+	{
+		GLR_CHECK(g_glRaytracingCmd.device->CreateDescriptorHeap(
+			&hd,
+			IID_PPV_ARGS(&g_glRaytracingLighting.descriptorHeapRing[frame])));
+	}
+
+	g_glRaytracingLighting.descriptorHeap = g_glRaytracingLighting.descriptorHeapRing[0];
+	g_glRaytracingLighting.descriptorStride =
+		g_glRaytracingCmd.device->GetDescriptorHandleIncrementSize(D3D12_DESCRIPTOR_HEAP_TYPE_CBV_SRV_UAV);
+
+	return 1;
+}
+
+static int glRaytracingLightingCreateRootSignatures(void)
+{
+	{
+		D3D12_DESCRIPTOR_RANGE ranges[2] = {};
+
+		ranges[0].RangeType = D3D12_DESCRIPTOR_RANGE_TYPE_SRV;
+		ranges[0].NumDescriptors = GLR_DESC_SRV_COUNT;
+		ranges[0].BaseShaderRegister = 0;
+		ranges[0].RegisterSpace = 0;
+		ranges[0].OffsetInDescriptorsFromTableStart = 0;
+
+		ranges[1].RangeType = D3D12_DESCRIPTOR_RANGE_TYPE_UAV;
+		ranges[1].NumDescriptors = GLR_DESC_UAV_COUNT;
+		ranges[1].BaseShaderRegister = 0;
+		ranges[1].RegisterSpace = 0;
+		ranges[1].OffsetInDescriptorsFromTableStart = 0;
+
+		D3D12_ROOT_PARAMETER params[3] = {};
+
+		params[0].ParameterType = D3D12_ROOT_PARAMETER_TYPE_DESCRIPTOR_TABLE;
+		params[0].DescriptorTable.NumDescriptorRanges = 1;
+		params[0].DescriptorTable.pDescriptorRanges = &ranges[0];
+		params[0].ShaderVisibility = D3D12_SHADER_VISIBILITY_ALL;
+
+		params[1].ParameterType = D3D12_ROOT_PARAMETER_TYPE_DESCRIPTOR_TABLE;
+		params[1].DescriptorTable.NumDescriptorRanges = 1;
+		params[1].DescriptorTable.pDescriptorRanges = &ranges[1];
+		params[1].ShaderVisibility = D3D12_SHADER_VISIBILITY_ALL;
+
+		params[2].ParameterType = D3D12_ROOT_PARAMETER_TYPE_CBV;
+		params[2].Descriptor.ShaderRegister = 0;
+		params[2].Descriptor.RegisterSpace = 0;
+		params[2].ShaderVisibility = D3D12_SHADER_VISIBILITY_ALL;
+
+		D3D12_ROOT_SIGNATURE_DESC rsd = {};
+		rsd.NumParameters = _countof(params);
+		rsd.pParameters = params;
+		rsd.Flags = D3D12_ROOT_SIGNATURE_FLAG_NONE;
+
+		ComPtr<ID3DBlob> sig;
+		ComPtr<ID3DBlob> err;
+		GLR_CHECK(D3D12SerializeRootSignature(&rsd, D3D_ROOT_SIGNATURE_VERSION_1, &sig, &err));
+		GLR_CHECK(g_glRaytracingCmd.device->CreateRootSignature(
+			0, sig->GetBufferPointer(), sig->GetBufferSize(),
+			IID_PPV_ARGS(&g_glRaytracingLighting.globalRootSig)));
+	}
+
+	{
+		D3D12_ROOT_SIGNATURE_DESC rsd = {};
+		rsd.Flags = D3D12_ROOT_SIGNATURE_FLAG_LOCAL_ROOT_SIGNATURE;
+
+		ComPtr<ID3DBlob> sig;
+		ComPtr<ID3DBlob> err;
+		GLR_CHECK(D3D12SerializeRootSignature(&rsd, D3D_ROOT_SIGNATURE_VERSION_1, &sig, &err));
+		GLR_CHECK(g_glRaytracingCmd.device->CreateRootSignature(
+			0, sig->GetBufferPointer(), sig->GetBufferSize(),
+			IID_PPV_ARGS(&g_glRaytracingLighting.localRootSig)));
+	}
+
+	return 1;
+}
+
+static int glRaytracingMapUploadBufferPersistent(const glRaytracingBuffer_t& buffer, void** mapped)
+{
+	if (!buffer.resource || !mapped)
+		return 0;
+
+	*mapped = nullptr;
+	D3D12_RANGE readRange = {};
+	HRESULT hr = buffer.resource->Map(0, &readRange, mapped);
+	if (FAILED(hr) || !*mapped)
+	{
+		glRaytracingFatal("Persistent upload Map failed 0x%08X", (unsigned)hr);
+		return 0;
+	}
+
+	return 1;
+}
+
+static void glRaytracingLightingSelectFrameResources(UINT frameSlot)
+{
+	frameSlot %= GL_RAYTRACING_CMD_RING_SIZE;
+
+	g_glRaytracingLighting.descriptorHeap = g_glRaytracingLighting.descriptorHeapRing[frameSlot];
+	g_glRaytracingLighting.constantBuffer = g_glRaytracingLighting.constantBufferRing[frameSlot];
+	g_glRaytracingLighting.lightBuffer = g_glRaytracingLighting.lightBufferRing[frameSlot];
+	g_glRaytracingLighting.constantBufferMapped = g_glRaytracingLighting.constantBufferMappedRing[frameSlot];
+	g_glRaytracingLighting.lightBufferMapped = g_glRaytracingLighting.lightBufferMappedRing[frameSlot];
+
+	for (int i = 0; i < 3; ++i)
+	{
+		g_glRaytracingLighting.denoiseConstantBuffer[i] = g_glRaytracingLighting.denoiseConstantBufferRing[frameSlot][i];
+		g_glRaytracingLighting.denoiseConstantBufferMapped[i] = g_glRaytracingLighting.denoiseConstantBufferMappedRing[frameSlot][i];
+	}
+}
+
+static int glRaytracingLightingCreateBuffers(void)
+{
+	const UINT64 constantsBytes = glRaytracingAlignUp(sizeof(glRaytracingLightingConstants_t), 256);
+
+	for (UINT frame = 0; frame < GL_RAYTRACING_CMD_RING_SIZE; ++frame)
+	{
+		g_glRaytracingLighting.constantBufferRing[frame] = glRaytracingCreateBuffer(
+			g_glRaytracingCmd.device.Get(),
+			constantsBytes,
+			D3D12_HEAP_TYPE_UPLOAD,
+			D3D12_RESOURCE_STATE_GENERIC_READ,
+			D3D12_RESOURCE_FLAG_NONE);
+
+		g_glRaytracingLighting.lightBufferRing[frame] = glRaytracingCreateBuffer(
+			g_glRaytracingCmd.device.Get(),
+			sizeof(glRaytracingLight_t) * GL_RAYTRACING_MAX_LIGHTS,
+			D3D12_HEAP_TYPE_UPLOAD,
+			D3D12_RESOURCE_STATE_GENERIC_READ,
+			D3D12_RESOURCE_FLAG_NONE);
+
+		if (!g_glRaytracingLighting.constantBufferRing[frame].resource ||
+			!g_glRaytracingLighting.lightBufferRing[frame].resource)
+		{
+			return 0;
+		}
+
+		for (int i = 0; i < 3; ++i)
+		{
+			g_glRaytracingLighting.denoiseConstantBufferRing[frame][i] = glRaytracingCreateBuffer(
+				g_glRaytracingCmd.device.Get(),
+				constantsBytes,
+				D3D12_HEAP_TYPE_UPLOAD,
+				D3D12_RESOURCE_STATE_GENERIC_READ,
+				D3D12_RESOURCE_FLAG_NONE);
+
+			if (!g_glRaytracingLighting.denoiseConstantBufferRing[frame][i].resource)
+				return 0;
+		}
+
+		// These are small UPLOAD-heap buffers updated every pass. Keeping every
+		// per-frame copy persistently mapped avoids Map/Unmap overhead and makes
+		// the async command-ring safe: the CPU never overwrites constants that an
+		// older in-flight command list still reads.
+		if (!glRaytracingMapUploadBufferPersistent(
+			g_glRaytracingLighting.constantBufferRing[frame],
+			&g_glRaytracingLighting.constantBufferMappedRing[frame]))
+		{
+			return 0;
+		}
+
+		if (!glRaytracingMapUploadBufferPersistent(
+			g_glRaytracingLighting.lightBufferRing[frame],
+			&g_glRaytracingLighting.lightBufferMappedRing[frame]))
+		{
+			return 0;
+		}
+
+		for (int i = 0; i < 3; ++i)
+		{
+			if (!glRaytracingMapUploadBufferPersistent(
+				g_glRaytracingLighting.denoiseConstantBufferRing[frame][i],
+				&g_glRaytracingLighting.denoiseConstantBufferMappedRing[frame][i]))
+			{
+				return 0;
+			}
+		}
+	}
+
+	glRaytracingLightingSelectFrameResources(0);
+	return 1;
+}
+
+static void glRaytracingLightingUploadConstantsTo(
+	const glRaytracingBuffer_t& dst,
+	const glRaytracingLightingConstants_t& constants)
+{
+	if (!dst.resource)
+		return;
+
+	void* mapped = nullptr;
+	if (dst.resource.Get() == g_glRaytracingLighting.constantBuffer.resource.Get())
+	{
+		mapped = g_glRaytracingLighting.constantBufferMapped;
+	}
+	else
+	{
+		for (int i = 0; i < 3; ++i)
+		{
+			if (dst.resource.Get() == g_glRaytracingLighting.denoiseConstantBuffer[i].resource.Get())
+			{
+				mapped = g_glRaytracingLighting.denoiseConstantBufferMapped[i];
+				break;
+			}
+		}
+	}
+
+	if (mapped)
+	{
+		memcpy(mapped, &constants, sizeof(constants));
+		return;
+	}
+
+	glRaytracingMapCopy(dst.resource.Get(), &constants, sizeof(constants));
+}
+
+static void glRaytracingLightingUpdateConstants(void)
+{
+	if (!g_glRaytracingLighting.uploadToCurrentFrameResource)
+		return;
+
+	glRaytracingLightingUploadConstantsTo(
+		g_glRaytracingLighting.constantBuffer,
+		g_glRaytracingLighting.constants);
+}
+
+static void glRaytracingLightingUpdateLights(void)
+{
+	if (!g_glRaytracingLighting.uploadToCurrentFrameResource)
+		return;
+
+	if (!g_glRaytracingLighting.lightBuffer.resource)
+		return;
+
+	if (g_glRaytracingLighting.cpuLights.empty())
+		return;
+
+	const size_t bytes = g_glRaytracingLighting.cpuLights.size() * sizeof(glRaytracingLight_t);
+	if (g_glRaytracingLighting.lightBufferMapped)
+	{
+		memcpy(g_glRaytracingLighting.lightBufferMapped, g_glRaytracingLighting.cpuLights.data(), bytes);
+		return;
+	}
+
+	glRaytracingMapCopy(
+		g_glRaytracingLighting.lightBuffer.resource.Get(),
+		g_glRaytracingLighting.cpuLights.data(),
+		bytes);
+}
+
+static void glRaytracingLightingUnmapUploadBuffers(void)
+{
+	for (UINT frame = 0; frame < GL_RAYTRACING_CMD_RING_SIZE; ++frame)
+	{
+		if (g_glRaytracingLighting.constantBufferRing[frame].resource &&
+			g_glRaytracingLighting.constantBufferMappedRing[frame])
+		{
+			g_glRaytracingLighting.constantBufferRing[frame].resource->Unmap(0, nullptr);
+			g_glRaytracingLighting.constantBufferMappedRing[frame] = nullptr;
+		}
+
+		if (g_glRaytracingLighting.lightBufferRing[frame].resource &&
+			g_glRaytracingLighting.lightBufferMappedRing[frame])
+		{
+			g_glRaytracingLighting.lightBufferRing[frame].resource->Unmap(0, nullptr);
+			g_glRaytracingLighting.lightBufferMappedRing[frame] = nullptr;
+		}
+
+		for (int i = 0; i < 3; ++i)
+		{
+			if (g_glRaytracingLighting.denoiseConstantBufferRing[frame][i].resource &&
+				g_glRaytracingLighting.denoiseConstantBufferMappedRing[frame][i])
+			{
+				g_glRaytracingLighting.denoiseConstantBufferRing[frame][i].resource->Unmap(0, nullptr);
+				g_glRaytracingLighting.denoiseConstantBufferMappedRing[frame][i] = nullptr;
+			}
+		}
+	}
+
+	g_glRaytracingLighting.constantBufferMapped = nullptr;
+	g_glRaytracingLighting.lightBufferMapped = nullptr;
+	for (int i = 0; i < 3; ++i)
+		g_glRaytracingLighting.denoiseConstantBufferMapped[i] = nullptr;
+}
+
+static void glRaytracingLightingCreatePersistentLightSRV(void)
+{
+	D3D12_SHADER_RESOURCE_VIEW_DESC srv = {};
+	srv.ViewDimension = D3D12_SRV_DIMENSION_BUFFER;
+	srv.Shader4ComponentMapping = D3D12_DEFAULT_SHADER_4_COMPONENT_MAPPING;
+	srv.Format = DXGI_FORMAT_UNKNOWN;
+	srv.Buffer.FirstElement = 0;
+	srv.Buffer.NumElements = GL_RAYTRACING_MAX_LIGHTS;
+	srv.Buffer.StructureByteStride = sizeof(glRaytracingLight_t);
+	srv.Buffer.Flags = D3D12_BUFFER_SRV_FLAG_NONE;
+
+	for (UINT frame = 0; frame < GL_RAYTRACING_CMD_RING_SIZE; ++frame)
+	{
+		if (!g_glRaytracingLighting.descriptorHeapRing[frame] ||
+			!g_glRaytracingLighting.lightBufferRing[frame].resource)
+		{
+			continue;
+		}
+
+		D3D12_CPU_DESCRIPTOR_HANDLE base =
+			g_glRaytracingLighting.descriptorHeapRing[frame]->GetCPUDescriptorHandleForHeapStart();
+		g_glRaytracingCmd.device->CreateShaderResourceView(
+			g_glRaytracingLighting.lightBufferRing[frame].resource.Get(),
+			&srv,
+			glRaytracingOffsetCpu(base, g_glRaytracingLighting.descriptorStride, GLR_DESC_LIGHTS_SRV));
+	}
+}
+
+static int glRaytracingLightingCreateStateObject(void)
+{
+	ComPtr<IDxcBlob> dxil = glRaytracingLightingCompileLibrary(g_glRaytracingLightingHlsl);
+	if (!dxil)
+		return 0;
+
+	D3D12_EXPORT_DESC exports[8] = {};
+	exports[0].Name = L"RayGen";
+	exports[1].Name = L"ShadowMiss";
+	exports[2].Name = L"ShadowAnyHit";
+	exports[3].Name = L"ShadowClosestHit";
+	exports[4].Name = L"BounceMiss";
+	exports[5].Name = L"BounceAnyHit";
+	exports[6].Name = L"BounceClosestHit";
+	exports[7].Name = L"ReflectionClosestHit";
+
+	D3D12_DXIL_LIBRARY_DESC libDesc = {};
+	D3D12_SHADER_BYTECODE libBytecode = {};
+	libBytecode.pShaderBytecode = dxil->GetBufferPointer();
+	libBytecode.BytecodeLength = dxil->GetBufferSize();
+	libDesc.DXILLibrary = libBytecode;
+	libDesc.NumExports = _countof(exports);
+	libDesc.pExports = exports;
+
+	D3D12_HIT_GROUP_DESC hitGroups[3] = {};
+	hitGroups[0].HitGroupExport = L"ShadowHitGroup";
+	hitGroups[0].AnyHitShaderImport = L"ShadowAnyHit";
+	hitGroups[0].ClosestHitShaderImport = L"ShadowClosestHit";
+	hitGroups[0].Type = D3D12_HIT_GROUP_TYPE_TRIANGLES;
+
+	hitGroups[1].HitGroupExport = L"BounceHitGroup";
+	hitGroups[1].AnyHitShaderImport = L"BounceAnyHit";
+	hitGroups[1].ClosestHitShaderImport = L"BounceClosestHit";
+	hitGroups[1].Type = D3D12_HIT_GROUP_TYPE_TRIANGLES;
+
+	hitGroups[2].HitGroupExport = L"ReflectionHitGroup";
+	hitGroups[2].ClosestHitShaderImport = L"ReflectionClosestHit";
+	hitGroups[2].Type = D3D12_HIT_GROUP_TYPE_TRIANGLES;
+
+	D3D12_RAYTRACING_SHADER_CONFIG shaderConfig = {};
+	shaderConfig.MaxPayloadSizeInBytes = 16; // BouncePayload: uint + float + uint + uint.
+	shaderConfig.MaxAttributeSizeInBytes = 8;
+
+	D3D12_GLOBAL_ROOT_SIGNATURE globalRS = {};
+	globalRS.pGlobalRootSignature = g_glRaytracingLighting.globalRootSig.Get();
+
+	D3D12_LOCAL_ROOT_SIGNATURE localRS = {};
+	localRS.pLocalRootSignature = g_glRaytracingLighting.localRootSig.Get();
+
+	D3D12_STATE_SUBOBJECT subobjects[9] = {};
+	UINT sub = 0;
+
+	subobjects[sub].Type = D3D12_STATE_SUBOBJECT_TYPE_DXIL_LIBRARY;
+	subobjects[sub].pDesc = &libDesc;
+	++sub;
+
+	subobjects[sub].Type = D3D12_STATE_SUBOBJECT_TYPE_HIT_GROUP;
+	subobjects[sub].pDesc = &hitGroups[0];
+	++sub;
+
+	subobjects[sub].Type = D3D12_STATE_SUBOBJECT_TYPE_HIT_GROUP;
+	subobjects[sub].pDesc = &hitGroups[1];
+	++sub;
+
+	subobjects[sub].Type = D3D12_STATE_SUBOBJECT_TYPE_HIT_GROUP;
+	subobjects[sub].pDesc = &hitGroups[2];
+	++sub;
+
+	subobjects[sub].Type = D3D12_STATE_SUBOBJECT_TYPE_RAYTRACING_SHADER_CONFIG;
+	subobjects[sub].pDesc = &shaderConfig;
+	++sub;
+
+	subobjects[sub].Type = D3D12_STATE_SUBOBJECT_TYPE_GLOBAL_ROOT_SIGNATURE;
+	subobjects[sub].pDesc = &globalRS;
+	++sub;
+
+	subobjects[sub].Type = D3D12_STATE_SUBOBJECT_TYPE_LOCAL_ROOT_SIGNATURE;
+	subobjects[sub].pDesc = &localRS;
+	++sub;
+
+	LPCWSTR localExports[] =
+	{
+		L"RayGen",
+		L"ShadowMiss",
+		L"ShadowHitGroup",
+		L"BounceMiss",
+		L"BounceHitGroup",
+		L"ReflectionHitGroup"
+	};
+
+	D3D12_SUBOBJECT_TO_EXPORTS_ASSOCIATION assoc = {};
+	assoc.pSubobjectToAssociate = &subobjects[6];
+	assoc.NumExports = _countof(localExports);
+	assoc.pExports = localExports;
+
+	subobjects[sub].Type = D3D12_STATE_SUBOBJECT_TYPE_SUBOBJECT_TO_EXPORTS_ASSOCIATION;
+	subobjects[sub].pDesc = &assoc;
+	++sub;
+
+	D3D12_RAYTRACING_PIPELINE_CONFIG pipeConfig = {};
+	pipeConfig.MaxTraceRecursionDepth = 1;
+
+	subobjects[sub].Type = D3D12_STATE_SUBOBJECT_TYPE_RAYTRACING_PIPELINE_CONFIG;
+	subobjects[sub].pDesc = &pipeConfig;
+	++sub;
+
+	D3D12_STATE_OBJECT_DESC soDesc = {};
+	soDesc.Type = D3D12_STATE_OBJECT_TYPE_RAYTRACING_PIPELINE;
+	soDesc.NumSubobjects = sub;
+	soDesc.pSubobjects = subobjects;
+
+	GLR_CHECK(g_glRaytracingCmd.device->CreateStateObject(&soDesc, IID_PPV_ARGS(&g_glRaytracingLighting.rtStateObject)));
+	GLR_CHECK(g_glRaytracingLighting.rtStateObject.As(&g_glRaytracingLighting.rtStateProps));
+	return 1;
+}
+
+static int glRaytracingLightingCreateShaderTables(void)
+{
+	void* raygenId = g_glRaytracingLighting.rtStateProps->GetShaderIdentifier(L"RayGen");
+	void* shadowMissId = g_glRaytracingLighting.rtStateProps->GetShaderIdentifier(L"ShadowMiss");
+	void* bounceMissId = g_glRaytracingLighting.rtStateProps->GetShaderIdentifier(L"BounceMiss");
+	void* shadowHitId = g_glRaytracingLighting.rtStateProps->GetShaderIdentifier(L"ShadowHitGroup");
+	void* bounceHitId = g_glRaytracingLighting.rtStateProps->GetShaderIdentifier(L"BounceHitGroup");
+	void* reflectionHitId = g_glRaytracingLighting.rtStateProps->GetShaderIdentifier(L"ReflectionHitGroup");
+
+	if (!raygenId || !shadowMissId || !bounceMissId || !shadowHitId || !bounceHitId || !reflectionHitId)
+	{
+		glRaytracingFatal("Failed to fetch shader identifiers");
+		return 0;
+	}
+
+	const UINT shaderIdSize = D3D12_SHADER_IDENTIFIER_SIZE_IN_BYTES;
+	const UINT recordSize = (UINT)glRaytracingAlignUp(shaderIdSize, D3D12_RAYTRACING_SHADER_RECORD_BYTE_ALIGNMENT);
+	const UINT missTableSize = recordSize * 2u;
+	const UINT hitTableSize = recordSize * 3u;
+
+	g_glRaytracingLighting.raygenTable = glRaytracingCreateBuffer(
+		g_glRaytracingCmd.device.Get(),
+		recordSize,
+		D3D12_HEAP_TYPE_UPLOAD,
+		D3D12_RESOURCE_STATE_GENERIC_READ,
+		D3D12_RESOURCE_FLAG_NONE);
+
+	g_glRaytracingLighting.missTable = glRaytracingCreateBuffer(
+		g_glRaytracingCmd.device.Get(),
+		missTableSize,
+		D3D12_HEAP_TYPE_UPLOAD,
+		D3D12_RESOURCE_STATE_GENERIC_READ,
+		D3D12_RESOURCE_FLAG_NONE);
+
+	g_glRaytracingLighting.hitTable = glRaytracingCreateBuffer(
+		g_glRaytracingCmd.device.Get(),
+		hitTableSize,
+		D3D12_HEAP_TYPE_UPLOAD,
+		D3D12_RESOURCE_STATE_GENERIC_READ,
+		D3D12_RESOURCE_FLAG_NONE);
+
+	if (!g_glRaytracingLighting.raygenTable.resource ||
+		!g_glRaytracingLighting.missTable.resource ||
+		!g_glRaytracingLighting.hitTable.resource)
+	{
+		return 0;
+	}
+
+	std::vector<uint8_t> temp;
+	temp.resize((size_t)max(recordSize, max(missTableSize, hitTableSize)), 0);
+
+	memset(temp.data(), 0, temp.size());
+	memcpy(temp.data(), raygenId, shaderIdSize);
+	glRaytracingMapCopy(g_glRaytracingLighting.raygenTable.resource.Get(), temp.data(), recordSize);
+
+	memset(temp.data(), 0, temp.size());
+	memcpy(temp.data(), shadowMissId, shaderIdSize);
+	memcpy(temp.data() + recordSize, bounceMissId, shaderIdSize);
+	glRaytracingMapCopy(g_glRaytracingLighting.missTable.resource.Get(), temp.data(), missTableSize);
+
+	memset(temp.data(), 0, temp.size());
+	memcpy(temp.data(), shadowHitId, shaderIdSize);
+	memcpy(temp.data() + recordSize, bounceHitId, shaderIdSize);
+	memcpy(temp.data() + recordSize * 2u, reflectionHitId, shaderIdSize);
+	glRaytracingMapCopy(g_glRaytracingLighting.hitTable.resource.Get(), temp.data(), hitTableSize);
+
+	return 1;
+}
+
+static int glRaytracingLightingCreateDenoisePipeline(void)
+{
+	ComPtr<IDxcBlob> dxil = glRaytracingLightingCompileCompute(g_glRaytracingDenoiseHlsl, L"DenoiseCS");
+	if (!dxil)
+		return 0;
+
+	D3D12_COMPUTE_PIPELINE_STATE_DESC pso = {};
+	pso.pRootSignature = g_glRaytracingLighting.globalRootSig.Get();
+	pso.CS.pShaderBytecode = dxil->GetBufferPointer();
+	pso.CS.BytecodeLength = dxil->GetBufferSize();
+
+	GLR_CHECK(g_glRaytracingCmd.device->CreateComputePipelineState(
+		&pso,
+		IID_PPV_ARGS(&g_glRaytracingLighting.denoisePSO)));
+
+	return 1;
+}
+
+
+static int glRaytracingLightingCreateTemporalPipeline(void)
+{
+	ComPtr<IDxcBlob> dxil = glRaytracingLightingCompileCompute(g_glRaytracingTemporalHlsl, L"TemporalAccumCS");
+	if (!dxil)
+		return 0;
+
+	D3D12_COMPUTE_PIPELINE_STATE_DESC pso = {};
+	pso.pRootSignature = g_glRaytracingLighting.globalRootSig.Get();
+	pso.CS.pShaderBytecode = dxil->GetBufferPointer();
+	pso.CS.BytecodeLength = dxil->GetBufferSize();
+
+	GLR_CHECK(g_glRaytracingCmd.device->CreateComputePipelineState(
+		&pso,
+		IID_PPV_ARGS(&g_glRaytracingLighting.temporalPSO)));
+
+	return 1;
+}
+
+static int glRaytracingLightingEnsureDenoiseResources(UINT width, UINT height)
+{
+	if (width == 0 || height == 0)
+		return 0;
+
+	if (g_glRaytracingLighting.pathTraceTexture.resource &&
+		g_glRaytracingLighting.temporalTexture.resource &&
+		g_glRaytracingLighting.historyTexture[0].resource &&
+		g_glRaytracingLighting.historyTexture[1].resource &&
+		g_glRaytracingLighting.denoiseTemp[0].resource &&
+		g_glRaytracingLighting.denoiseTemp[1].resource &&
+		g_glRaytracingLighting.denoiseWidth == width &&
+		g_glRaytracingLighting.denoiseHeight == height &&
+		g_glRaytracingLighting.denoiseFormat == GL_RAYTRACING_DENOISE_FORMAT)
+	{
+		return 1;
+	}
+
+	if (g_glRaytracingLighting.pathTraceTexture.resource ||
+		g_glRaytracingLighting.temporalTexture.resource ||
+		g_glRaytracingLighting.historyTexture[0].resource ||
+		g_glRaytracingLighting.historyTexture[1].resource ||
+		g_glRaytracingLighting.denoiseTemp[0].resource ||
+		g_glRaytracingLighting.denoiseTemp[1].resource)
+	{
+		glRaytracingWaitIdle();
+	}
+
+	g_glRaytracingLighting.pathTraceTexture = glRaytracingTexture_t();
+	g_glRaytracingLighting.temporalTexture = glRaytracingTexture_t();
+	g_glRaytracingLighting.historyTexture[0] = glRaytracingTexture_t();
+	g_glRaytracingLighting.historyTexture[1] = glRaytracingTexture_t();
+	g_glRaytracingLighting.denoiseTemp[0] = glRaytracingTexture_t();
+	g_glRaytracingLighting.denoiseTemp[1] = glRaytracingTexture_t();
+
+	g_glRaytracingLighting.pathTraceTexture = glRaytracingCreateTexture2D(
+		g_glRaytracingCmd.device.Get(),
+		width,
+		height,
+		GL_RAYTRACING_DENOISE_FORMAT,
+		D3D12_RESOURCE_STATE_UNORDERED_ACCESS,
+		D3D12_RESOURCE_FLAG_ALLOW_UNORDERED_ACCESS);
+
+	g_glRaytracingLighting.temporalTexture = glRaytracingCreateTexture2D(
+		g_glRaytracingCmd.device.Get(),
+		width,
+		height,
+		GL_RAYTRACING_DENOISE_FORMAT,
+		D3D12_RESOURCE_STATE_UNORDERED_ACCESS,
+		D3D12_RESOURCE_FLAG_ALLOW_UNORDERED_ACCESS);
+
+	for (int i = 0; i < 2; ++i)
+	{
+		g_glRaytracingLighting.historyTexture[i] = glRaytracingCreateTexture2D(
+			g_glRaytracingCmd.device.Get(),
+			width,
+			height,
+			GL_RAYTRACING_DENOISE_FORMAT,
+			D3D12_RESOURCE_STATE_NON_PIXEL_SHADER_RESOURCE,
+			D3D12_RESOURCE_FLAG_ALLOW_UNORDERED_ACCESS);
+	}
+
+	for (int i = 0; i < 2; ++i)
+	{
+		g_glRaytracingLighting.denoiseTemp[i] = glRaytracingCreateTexture2D(
+			g_glRaytracingCmd.device.Get(),
+			width,
+			height,
+			GL_RAYTRACING_DENOISE_FORMAT,
+			D3D12_RESOURCE_STATE_UNORDERED_ACCESS,
+			D3D12_RESOURCE_FLAG_ALLOW_UNORDERED_ACCESS);
+	}
+
+	if (!g_glRaytracingLighting.pathTraceTexture.resource ||
+		!g_glRaytracingLighting.temporalTexture.resource ||
+		!g_glRaytracingLighting.historyTexture[0].resource ||
+		!g_glRaytracingLighting.historyTexture[1].resource ||
+		!g_glRaytracingLighting.denoiseTemp[0].resource ||
+		!g_glRaytracingLighting.denoiseTemp[1].resource)
+	{
+		return 0;
+	}
+
+	g_glRaytracingLighting.currentHistoryIndex = 0;
+	g_glRaytracingLighting.denoiseWidth = width;
+	g_glRaytracingLighting.denoiseHeight = height;
+	g_glRaytracingLighting.denoiseFormat = GL_RAYTRACING_DENOISE_FORMAT;
+	glRaytracingLightingResetDenoiseHistory();
+	return 1;
+}
+
+static void glRaytracingLightingCreatePerPassDescriptors(
+	const glRaytracingLightingPassDesc_t* pass,
+	ID3D12Resource* topLevelAS,
+	ID3D12Resource* rayOutputTexture,
+	ID3D12Resource* pathTraceTexture,
+	ID3D12Resource* denoiseATexture,
+	ID3D12Resource* denoiseBTexture,
+	ID3D12Resource* historyReadTexture,
+	ID3D12Resource* historyWriteTexture,
+	ID3D12Resource* temporalTexture)
+{
+	D3D12_CPU_DESCRIPTOR_HANDLE base = g_glRaytracingLighting.descriptorHeap->GetCPUDescriptorHandleForHeapStart();
+
+	D3D12_SHADER_RESOURCE_VIEW_DESC albedoSrv = {};
+	albedoSrv.Shader4ComponentMapping = D3D12_DEFAULT_SHADER_4_COMPONENT_MAPPING;
+	albedoSrv.ViewDimension = D3D12_SRV_DIMENSION_TEXTURE2D;
+	albedoSrv.Format = pass->albedoFormat;
+	albedoSrv.Texture2D.MipLevels = 1;
+	g_glRaytracingCmd.device->CreateShaderResourceView(pass->albedoTexture, &albedoSrv,
+		glRaytracingOffsetCpu(base, g_glRaytracingLighting.descriptorStride, GLR_DESC_ALBEDO_SRV));
+
+	D3D12_SHADER_RESOURCE_VIEW_DESC depthSrv = {};
+	depthSrv.Shader4ComponentMapping = D3D12_DEFAULT_SHADER_4_COMPONENT_MAPPING;
+	depthSrv.ViewDimension = D3D12_SRV_DIMENSION_TEXTURE2D;
+	depthSrv.Format = glRaytracingGetSrvFormatForDepth(pass->depthFormat);
+	depthSrv.Texture2D.MipLevels = 1;
+	g_glRaytracingCmd.device->CreateShaderResourceView(pass->depthTexture, &depthSrv,
+		glRaytracingOffsetCpu(base, g_glRaytracingLighting.descriptorStride, GLR_DESC_DEPTH_SRV));
+
+	D3D12_SHADER_RESOURCE_VIEW_DESC normalSrv = {};
+	normalSrv.Shader4ComponentMapping = D3D12_DEFAULT_SHADER_4_COMPONENT_MAPPING;
+	normalSrv.ViewDimension = D3D12_SRV_DIMENSION_TEXTURE2D;
+	normalSrv.Format = pass->normalFormat;
+	normalSrv.Texture2D.MipLevels = 1;
+	g_glRaytracingCmd.device->CreateShaderResourceView(pass->normalTexture, &normalSrv,
+		glRaytracingOffsetCpu(base, g_glRaytracingLighting.descriptorStride, GLR_DESC_NORMAL_SRV));
+
+	D3D12_SHADER_RESOURCE_VIEW_DESC positionSrv = {};
+	positionSrv.Shader4ComponentMapping = D3D12_DEFAULT_SHADER_4_COMPONENT_MAPPING;
+	positionSrv.ViewDimension = D3D12_SRV_DIMENSION_TEXTURE2D;
+	positionSrv.Format = pass->positionFormat;
+	positionSrv.Texture2D.MipLevels = 1;
+	g_glRaytracingCmd.device->CreateShaderResourceView(pass->positionTexture, &positionSrv,
+		glRaytracingOffsetCpu(base, g_glRaytracingLighting.descriptorStride, GLR_DESC_POSITION_SRV));
+
+	D3D12_SHADER_RESOURCE_VIEW_DESC tlasSrv = {};
+	tlasSrv.ViewDimension = D3D12_SRV_DIMENSION_RAYTRACING_ACCELERATION_STRUCTURE;
+	tlasSrv.Shader4ComponentMapping = D3D12_DEFAULT_SHADER_4_COMPONENT_MAPPING;
+	tlasSrv.RaytracingAccelerationStructure.Location = topLevelAS->GetGPUVirtualAddress();
+	g_glRaytracingCmd.device->CreateShaderResourceView(nullptr, &tlasSrv,
+		glRaytracingOffsetCpu(base, g_glRaytracingLighting.descriptorStride, GLR_DESC_TLAS_SRV));
+
+	D3D12_SHADER_RESOURCE_VIEW_DESC denoiseSrv = {};
+	denoiseSrv.Shader4ComponentMapping = D3D12_DEFAULT_SHADER_4_COMPONENT_MAPPING;
+	denoiseSrv.ViewDimension = D3D12_SRV_DIMENSION_TEXTURE2D;
+	denoiseSrv.Format = GL_RAYTRACING_DENOISE_FORMAT;
+	denoiseSrv.Texture2D.MipLevels = 1;
+
+	g_glRaytracingCmd.device->CreateShaderResourceView(pathTraceTexture, &denoiseSrv,
+		glRaytracingOffsetCpu(base, g_glRaytracingLighting.descriptorStride, GLR_DESC_PATHTRACE_SRV));
+	g_glRaytracingCmd.device->CreateShaderResourceView(denoiseATexture, &denoiseSrv,
+		glRaytracingOffsetCpu(base, g_glRaytracingLighting.descriptorStride, GLR_DESC_DENOISE_A_SRV));
+	g_glRaytracingCmd.device->CreateShaderResourceView(denoiseBTexture, &denoiseSrv,
+		glRaytracingOffsetCpu(base, g_glRaytracingLighting.descriptorStride, GLR_DESC_DENOISE_B_SRV));
+	g_glRaytracingCmd.device->CreateShaderResourceView(historyReadTexture, &denoiseSrv,
+		glRaytracingOffsetCpu(base, g_glRaytracingLighting.descriptorStride, GLR_DESC_HISTORY_SRV));
+	g_glRaytracingCmd.device->CreateShaderResourceView(temporalTexture, &denoiseSrv,
+		glRaytracingOffsetCpu(base, g_glRaytracingLighting.descriptorStride, GLR_DESC_TEMPORAL_SRV));
+
+	D3D12_SHADER_RESOURCE_VIEW_DESC emissiveSrv = {};
+	emissiveSrv.Shader4ComponentMapping = D3D12_DEFAULT_SHADER_4_COMPONENT_MAPPING;
+	emissiveSrv.ViewDimension = D3D12_SRV_DIMENSION_TEXTURE2D;
+	emissiveSrv.Format = g_glRaytracingLighting.emissiveFormat;
+	emissiveSrv.Texture2D.MipLevels = 1;
+	g_glRaytracingCmd.device->CreateShaderResourceView(g_glRaytracingLighting.emissiveTexture, &emissiveSrv,
+		glRaytracingOffsetCpu(base, g_glRaytracingLighting.descriptorStride, GLR_DESC_EMISSIVE_SRV));
+
+	D3D12_SHADER_RESOURCE_VIEW_DESC specularSrv = {};
+	specularSrv.ViewDimension = D3D12_SRV_DIMENSION_TEXTURE2D;
+	specularSrv.Texture2D.MipLevels = 1;
+	ID3D12Resource* specularResource = g_glRaytracingLighting.specularTexture;
+	if (specularResource)
+	{
+		specularSrv.Shader4ComponentMapping = D3D12_DEFAULT_SHADER_4_COMPONENT_MAPPING;
+		specularSrv.Format = g_glRaytracingLighting.specularFormat;
+	}
+	else
+	{
+		// Bind a harmless fallback descriptor when the shim has not provided a
+		// specular G-buffer. The shader sees alpha zero and uses the legacy fallback.
+		specularResource = pass->albedoTexture;
+		specularSrv.Shader4ComponentMapping = D3D12_ENCODE_SHADER_4_COMPONENT_MAPPING(
+			D3D12_SHADER_COMPONENT_MAPPING_FROM_MEMORY_COMPONENT_0,
+			D3D12_SHADER_COMPONENT_MAPPING_FROM_MEMORY_COMPONENT_1,
+			D3D12_SHADER_COMPONENT_MAPPING_FROM_MEMORY_COMPONENT_2,
+			D3D12_SHADER_COMPONENT_MAPPING_FORCE_VALUE_0);
+		specularSrv.Format = pass->albedoFormat;
+	}
+	g_glRaytracingCmd.device->CreateShaderResourceView(specularResource, &specularSrv,
+		glRaytracingOffsetCpu(base, g_glRaytracingLighting.descriptorStride, GLR_DESC_SPECULAR_SRV));
+
+	D3D12_UNORDERED_ACCESS_VIEW_DESC rayOutputUav = {};
+	rayOutputUav.ViewDimension = D3D12_UAV_DIMENSION_TEXTURE2D;
+	rayOutputUav.Format = GL_RAYTRACING_DENOISE_FORMAT;
+	g_glRaytracingCmd.device->CreateUnorderedAccessView(rayOutputTexture, nullptr, &rayOutputUav,
+		glRaytracingOffsetCpu(base, g_glRaytracingLighting.descriptorStride, GLR_DESC_PATHTRACE_UAV));
+
+	D3D12_UNORDERED_ACCESS_VIEW_DESC denoiseUav = {};
+	denoiseUav.ViewDimension = D3D12_UAV_DIMENSION_TEXTURE2D;
+	denoiseUav.Format = GL_RAYTRACING_DENOISE_FORMAT;
+	g_glRaytracingCmd.device->CreateUnorderedAccessView(denoiseATexture, nullptr, &denoiseUav,
+		glRaytracingOffsetCpu(base, g_glRaytracingLighting.descriptorStride, GLR_DESC_DENOISE_A_UAV));
+	g_glRaytracingCmd.device->CreateUnorderedAccessView(denoiseBTexture, nullptr, &denoiseUav,
+		glRaytracingOffsetCpu(base, g_glRaytracingLighting.descriptorStride, GLR_DESC_DENOISE_B_UAV));
+
+	D3D12_UNORDERED_ACCESS_VIEW_DESC outputUav = {};
+	outputUav.ViewDimension = D3D12_UAV_DIMENSION_TEXTURE2D;
+	outputUav.Format = pass->outputFormat;
+	g_glRaytracingCmd.device->CreateUnorderedAccessView(pass->outputTexture, nullptr, &outputUav,
+		glRaytracingOffsetCpu(base, g_glRaytracingLighting.descriptorStride, GLR_DESC_OUTPUT_UAV));
+
+	D3D12_UNORDERED_ACCESS_VIEW_DESC temporalUav = {};
+	temporalUav.ViewDimension = D3D12_UAV_DIMENSION_TEXTURE2D;
+	temporalUav.Format = GL_RAYTRACING_DENOISE_FORMAT;
+	g_glRaytracingCmd.device->CreateUnorderedAccessView(temporalTexture, nullptr, &temporalUav,
+		glRaytracingOffsetCpu(base, g_glRaytracingLighting.descriptorStride, GLR_DESC_TEMPORAL_UAV));
+	g_glRaytracingCmd.device->CreateUnorderedAccessView(historyWriteTexture, nullptr, &temporalUav,
+		glRaytracingOffsetCpu(base, g_glRaytracingLighting.descriptorStride, GLR_DESC_HISTORY_UAV));
+}
+
+
+
+// ============================================================
+// Lighting public API
+// ============================================================
+
+static bool glRaytracingLightingExecuteInternal(
+	const glRaytracingLightingPassDesc_t* pass,
+	ID3D12Resource* topLevelAS)
+{
+	if (!g_glRaytracingLighting.initialized || !pass || !topLevelAS)
+		return false;
+
+	if (!pass->albedoTexture || !pass->depthTexture || !pass->normalTexture || !pass->positionTexture || !pass->outputTexture)
+		return false;
+
+	if (pass->width == 0 || pass->height == 0)
+		return false;
+
+	if (!glRaytracingLightingEnsureDenoiseResources(pass->width, pass->height))
+		return false;
+
+	const bool useInternalDenoiser =
+		(g_glRaytracingLighting.constants.enableDenoiser != 0u) &&
+		!g_glRaytracingLighting.externalDenoiser;
+
+	ID3D12Resource* rayOutputTexture = useInternalDenoiser
+		? g_glRaytracingLighting.pathTraceTexture.resource.Get()
+		: pass->outputTexture;
+
+	if (!glRaytracingBeginCmd())
+		return false;
+
+	glRaytracingLightingSelectFrameResources(g_glRaytracingCmd.cmdCurrentSlot);
+
+	g_glRaytracingLighting.constants.screenSize[0] = (float)pass->width;
+	g_glRaytracingLighting.constants.screenSize[1] = (float)pass->height;
+	g_glRaytracingLighting.constants.screenSize[2] = 1.0f / (float)pass->width;
+	g_glRaytracingLighting.constants.screenSize[3] = 1.0f / (float)pass->height;
+	g_glRaytracingLighting.constants.frameIndex = g_glRaytracingLighting.frameCounter;
+	g_glRaytracingLighting.constants.lightCount =
+		(uint32_t)glRaytracingClamp<size_t>(g_glRaytracingLighting.cpuLights.size(), 0, GL_RAYTRACING_MAX_LIGHTS);
+
+	g_glRaytracingLighting.uploadToCurrentFrameResource = true;
+	glRaytracingLightingUpdateLights();
+	glRaytracingLightingUpdateConstants();
+
+	for (uint32_t passIndex = 0; passIndex < 3u; ++passIndex)
+	{
+		glRaytracingLightingConstants_t denoiseConstants = g_glRaytracingLighting.constants;
+		denoiseConstants.denoisePassIndex = passIndex;
+		denoiseConstants.denoiseStepWidth = (float)(1u << passIndex);
+		glRaytracingLightingUploadConstantsTo(g_glRaytracingLighting.denoiseConstantBuffer[passIndex], denoiseConstants);
+	}
+	g_glRaytracingLighting.uploadToCurrentFrameResource = false;
+
+	const uint32_t historyReadIndex = g_glRaytracingLighting.currentHistoryIndex & 1u;
+	const uint32_t historyWriteIndex = (g_glRaytracingLighting.currentHistoryIndex ^ 1u) & 1u;
+
+	glRaytracingLightingCreatePerPassDescriptors(
+		pass,
+		topLevelAS,
+		rayOutputTexture,
+		g_glRaytracingLighting.pathTraceTexture.resource.Get(),
+		g_glRaytracingLighting.denoiseTemp[0].resource.Get(),
+		g_glRaytracingLighting.denoiseTemp[1].resource.Get(),
+		g_glRaytracingLighting.historyTexture[historyReadIndex].resource.Get(),
+		g_glRaytracingLighting.historyTexture[historyWriteIndex].resource.Get(),
+		g_glRaytracingLighting.temporalTexture.resource.Get());
+
+	if (useInternalDenoiser)
+	{
+		glRaytracingTransition(g_glRaytracingCmd.cmdList.Get(),
+			g_glRaytracingLighting.pathTraceTexture.resource.Get(),
+			g_glRaytracingLighting.pathTraceTexture.state,
+			D3D12_RESOURCE_STATE_UNORDERED_ACCESS);
+		g_glRaytracingLighting.pathTraceTexture.state = D3D12_RESOURCE_STATE_UNORDERED_ACCESS;
+	}
+	else
+	{
+		glRaytracingTransition(g_glRaytracingCmd.cmdList.Get(),
+			pass->outputTexture,
+			D3D12_RESOURCE_STATE_PIXEL_SHADER_RESOURCE,
+			D3D12_RESOURCE_STATE_UNORDERED_ACCESS);
+	}
+
+	ID3D12DescriptorHeap* heaps[] = { g_glRaytracingLighting.descriptorHeap.Get() };
+	g_glRaytracingCmd.cmdList->SetDescriptorHeaps(_countof(heaps), heaps);
+	g_glRaytracingCmd.cmdList->SetComputeRootSignature(g_glRaytracingLighting.globalRootSig.Get());
+
+	D3D12_GPU_DESCRIPTOR_HANDLE gpuBase = g_glRaytracingLighting.descriptorHeap->GetGPUDescriptorHandleForHeapStart();
+	g_glRaytracingCmd.cmdList->SetComputeRootDescriptorTable(0,
+		glRaytracingOffsetGpu(gpuBase, g_glRaytracingLighting.descriptorStride, GLR_DESC_LIGHTS_SRV));
+	g_glRaytracingCmd.cmdList->SetComputeRootDescriptorTable(1,
+		glRaytracingOffsetGpu(gpuBase, g_glRaytracingLighting.descriptorStride, GLR_DESC_PATHTRACE_UAV));
+	g_glRaytracingCmd.cmdList->SetComputeRootConstantBufferView(2, g_glRaytracingLighting.constantBuffer.gpuVA);
+	g_glRaytracingCmd.cmdList->SetPipelineState1(g_glRaytracingLighting.rtStateObject.Get());
+
+	const UINT timestampBase = g_glRaytracingCmd.cmdCurrentSlot * 2u;
+	const bool writeTimestamp =
+		g_glRaytracingCmd.pathTracingTimestampHeap.Get() != nullptr &&
+		g_glRaytracingCmd.pathTracingTimestampReadback.resource.Get() != nullptr;
+	if (writeTimestamp)
+	{
+		g_glRaytracingCmd.cmdList->EndQuery(
+			g_glRaytracingCmd.pathTracingTimestampHeap.Get(),
+			D3D12_QUERY_TYPE_TIMESTAMP,
+			timestampBase + 0u);
+	}
+
+	const UINT shaderRecordSize = (UINT)glRaytracingAlignUp(
+		D3D12_SHADER_IDENTIFIER_SIZE_IN_BYTES,
+		D3D12_RAYTRACING_SHADER_RECORD_BYTE_ALIGNMENT);
+
+	D3D12_DISPATCH_RAYS_DESC rays = {};
+	rays.RayGenerationShaderRecord.StartAddress = g_glRaytracingLighting.raygenTable.gpuVA;
+	rays.RayGenerationShaderRecord.SizeInBytes = shaderRecordSize;
+	rays.MissShaderTable.StartAddress = g_glRaytracingLighting.missTable.gpuVA;
+	rays.MissShaderTable.SizeInBytes = shaderRecordSize * 2u;
+	rays.MissShaderTable.StrideInBytes = shaderRecordSize;
+	rays.HitGroupTable.StartAddress = g_glRaytracingLighting.hitTable.gpuVA;
+	rays.HitGroupTable.SizeInBytes = shaderRecordSize * 3u;
+	rays.HitGroupTable.StrideInBytes = shaderRecordSize;
+	rays.Width = pass->width;
+	rays.Height = pass->height;
+	rays.Depth = 1;
+	g_glRaytracingCmd.cmdList->DispatchRays(&rays);
+
+	D3D12_RESOURCE_BARRIER rawUav = {};
+	rawUav.Type = D3D12_RESOURCE_BARRIER_TYPE_UAV;
+	rawUav.UAV.pResource = rayOutputTexture;
+	g_glRaytracingCmd.cmdList->ResourceBarrier(1, &rawUav);
+
+	if (useInternalDenoiser)
+	{
+		const UINT groupsX = (pass->width + 7u) / 8u;
+		const UINT groupsY = (pass->height + 7u) / 8u;
+
+		glRaytracingTransition(g_glRaytracingCmd.cmdList.Get(),
+			g_glRaytracingLighting.pathTraceTexture.resource.Get(),
+			g_glRaytracingLighting.pathTraceTexture.state,
+			D3D12_RESOURCE_STATE_NON_PIXEL_SHADER_RESOURCE);
+		g_glRaytracingLighting.pathTraceTexture.state = D3D12_RESOURCE_STATE_NON_PIXEL_SHADER_RESOURCE;
+
+		glRaytracingTransition(g_glRaytracingCmd.cmdList.Get(),
+			g_glRaytracingLighting.temporalTexture.resource.Get(),
+			g_glRaytracingLighting.temporalTexture.state,
+			D3D12_RESOURCE_STATE_UNORDERED_ACCESS);
+		g_glRaytracingLighting.temporalTexture.state = D3D12_RESOURCE_STATE_UNORDERED_ACCESS;
+
+		glRaytracingTransition(g_glRaytracingCmd.cmdList.Get(),
+			g_glRaytracingLighting.historyTexture[historyReadIndex].resource.Get(),
+			g_glRaytracingLighting.historyTexture[historyReadIndex].state,
+			D3D12_RESOURCE_STATE_NON_PIXEL_SHADER_RESOURCE);
+		g_glRaytracingLighting.historyTexture[historyReadIndex].state = D3D12_RESOURCE_STATE_NON_PIXEL_SHADER_RESOURCE;
+
+		glRaytracingTransition(g_glRaytracingCmd.cmdList.Get(),
+			g_glRaytracingLighting.historyTexture[historyWriteIndex].resource.Get(),
+			g_glRaytracingLighting.historyTexture[historyWriteIndex].state,
+			D3D12_RESOURCE_STATE_UNORDERED_ACCESS);
+		g_glRaytracingLighting.historyTexture[historyWriteIndex].state = D3D12_RESOURCE_STATE_UNORDERED_ACCESS;
+
+		g_glRaytracingCmd.cmdList->SetComputeRootSignature(g_glRaytracingLighting.globalRootSig.Get());
+		g_glRaytracingCmd.cmdList->SetComputeRootDescriptorTable(0,
+			glRaytracingOffsetGpu(gpuBase, g_glRaytracingLighting.descriptorStride, GLR_DESC_LIGHTS_SRV));
+		g_glRaytracingCmd.cmdList->SetComputeRootDescriptorTable(1,
+			glRaytracingOffsetGpu(gpuBase, g_glRaytracingLighting.descriptorStride, GLR_DESC_PATHTRACE_UAV));
+		g_glRaytracingCmd.cmdList->SetComputeRootConstantBufferView(2, g_glRaytracingLighting.constantBuffer.gpuVA);
+		g_glRaytracingCmd.cmdList->SetPipelineState(g_glRaytracingLighting.temporalPSO.Get());
+		g_glRaytracingCmd.cmdList->Dispatch(groupsX, groupsY, 1);
+
+		D3D12_RESOURCE_BARRIER temporalUavs[2] = {};
+		temporalUavs[0].Type = D3D12_RESOURCE_BARRIER_TYPE_UAV;
+		temporalUavs[0].UAV.pResource = g_glRaytracingLighting.temporalTexture.resource.Get();
+		temporalUavs[1].Type = D3D12_RESOURCE_BARRIER_TYPE_UAV;
+		temporalUavs[1].UAV.pResource = g_glRaytracingLighting.historyTexture[historyWriteIndex].resource.Get();
+		g_glRaytracingCmd.cmdList->ResourceBarrier(2, temporalUavs);
+
+		glRaytracingTransition(g_glRaytracingCmd.cmdList.Get(),
+			g_glRaytracingLighting.temporalTexture.resource.Get(),
+			g_glRaytracingLighting.temporalTexture.state,
+			D3D12_RESOURCE_STATE_NON_PIXEL_SHADER_RESOURCE);
+		g_glRaytracingLighting.temporalTexture.state = D3D12_RESOURCE_STATE_NON_PIXEL_SHADER_RESOURCE;
+
+		glRaytracingTransition(g_glRaytracingCmd.cmdList.Get(),
+			g_glRaytracingLighting.historyTexture[historyWriteIndex].resource.Get(),
+			g_glRaytracingLighting.historyTexture[historyWriteIndex].state,
+			D3D12_RESOURCE_STATE_NON_PIXEL_SHADER_RESOURCE);
+		g_glRaytracingLighting.historyTexture[historyWriteIndex].state = D3D12_RESOURCE_STATE_NON_PIXEL_SHADER_RESOURCE;
+
+		for (int i = 0; i < 2; ++i)
+		{
+			glRaytracingTransition(g_glRaytracingCmd.cmdList.Get(),
+				g_glRaytracingLighting.denoiseTemp[i].resource.Get(),
+				g_glRaytracingLighting.denoiseTemp[i].state,
+				D3D12_RESOURCE_STATE_UNORDERED_ACCESS);
+			g_glRaytracingLighting.denoiseTemp[i].state = D3D12_RESOURCE_STATE_UNORDERED_ACCESS;
+		}
+
+		glRaytracingTransition(g_glRaytracingCmd.cmdList.Get(),
+			pass->outputTexture,
+			D3D12_RESOURCE_STATE_PIXEL_SHADER_RESOURCE,
+			D3D12_RESOURCE_STATE_UNORDERED_ACCESS);
+
+		g_glRaytracingCmd.cmdList->SetComputeRootSignature(g_glRaytracingLighting.globalRootSig.Get());
+		g_glRaytracingCmd.cmdList->SetComputeRootDescriptorTable(0,
+			glRaytracingOffsetGpu(gpuBase, g_glRaytracingLighting.descriptorStride, GLR_DESC_LIGHTS_SRV));
+		g_glRaytracingCmd.cmdList->SetComputeRootDescriptorTable(1,
+			glRaytracingOffsetGpu(gpuBase, g_glRaytracingLighting.descriptorStride, GLR_DESC_PATHTRACE_UAV));
+		g_glRaytracingCmd.cmdList->SetPipelineState(g_glRaytracingLighting.denoisePSO.Get());
+
+		// Pass 0: temporally accumulated path trace -> temp A.
+		g_glRaytracingCmd.cmdList->SetComputeRootConstantBufferView(2, g_glRaytracingLighting.denoiseConstantBuffer[0].gpuVA);
+		g_glRaytracingCmd.cmdList->Dispatch(groupsX, groupsY, 1);
+
+		D3D12_RESOURCE_BARRIER uavA = {};
+		uavA.Type = D3D12_RESOURCE_BARRIER_TYPE_UAV;
+		uavA.UAV.pResource = g_glRaytracingLighting.denoiseTemp[0].resource.Get();
+		g_glRaytracingCmd.cmdList->ResourceBarrier(1, &uavA);
+
+		glRaytracingTransition(g_glRaytracingCmd.cmdList.Get(),
+			g_glRaytracingLighting.denoiseTemp[0].resource.Get(),
+			g_glRaytracingLighting.denoiseTemp[0].state,
+			D3D12_RESOURCE_STATE_NON_PIXEL_SHADER_RESOURCE);
+		g_glRaytracingLighting.denoiseTemp[0].state = D3D12_RESOURCE_STATE_NON_PIXEL_SHADER_RESOURCE;
+
+		// Pass 1: temp A -> temp B.
+		g_glRaytracingCmd.cmdList->SetComputeRootConstantBufferView(2, g_glRaytracingLighting.denoiseConstantBuffer[1].gpuVA);
+		g_glRaytracingCmd.cmdList->Dispatch(groupsX, groupsY, 1);
+
+		D3D12_RESOURCE_BARRIER uavB = {};
+		uavB.Type = D3D12_RESOURCE_BARRIER_TYPE_UAV;
+		uavB.UAV.pResource = g_glRaytracingLighting.denoiseTemp[1].resource.Get();
+		g_glRaytracingCmd.cmdList->ResourceBarrier(1, &uavB);
+
+		glRaytracingTransition(g_glRaytracingCmd.cmdList.Get(),
+			g_glRaytracingLighting.denoiseTemp[1].resource.Get(),
+			g_glRaytracingLighting.denoiseTemp[1].state,
+			D3D12_RESOURCE_STATE_NON_PIXEL_SHADER_RESOURCE);
+		g_glRaytracingLighting.denoiseTemp[1].state = D3D12_RESOURCE_STATE_NON_PIXEL_SHADER_RESOURCE;
+
+		// Pass 2: temp B -> final output.
+		g_glRaytracingCmd.cmdList->SetComputeRootConstantBufferView(2, g_glRaytracingLighting.denoiseConstantBuffer[2].gpuVA);
+		g_glRaytracingCmd.cmdList->Dispatch(groupsX, groupsY, 1);
+
+		D3D12_RESOURCE_BARRIER outputUav = {};
+		outputUav.Type = D3D12_RESOURCE_BARRIER_TYPE_UAV;
+		outputUav.UAV.pResource = pass->outputTexture;
+		g_glRaytracingCmd.cmdList->ResourceBarrier(1, &outputUav);
+	}
+
+	glRaytracingTransition(g_glRaytracingCmd.cmdList.Get(),
+		pass->outputTexture,
+		D3D12_RESOURCE_STATE_UNORDERED_ACCESS,
+		D3D12_RESOURCE_STATE_PIXEL_SHADER_RESOURCE);
+
+	if (writeTimestamp)
+	{
+		g_glRaytracingCmd.cmdList->EndQuery(
+			g_glRaytracingCmd.pathTracingTimestampHeap.Get(),
+			D3D12_QUERY_TYPE_TIMESTAMP,
+			timestampBase + 1u);
+		g_glRaytracingCmd.cmdList->ResolveQueryData(
+			g_glRaytracingCmd.pathTracingTimestampHeap.Get(),
+			D3D12_QUERY_TYPE_TIMESTAMP,
+			timestampBase,
+			2,
+			g_glRaytracingCmd.pathTracingTimestampReadback.resource.Get(),
+			sizeof(UINT64) * timestampBase);
+	}
+
+	if (!glRaytracingEndCmd())
+		return false;
+
+	if (writeTimestamp)
+		g_glRaytracingCmd.pathTracingTimestampFenceRing[g_glRaytracingCmd.cmdCurrentSlot] = g_glRaytracingCmd.cmdLastFenceValue;
+
+	if (useInternalDenoiser)
+		g_glRaytracingLighting.currentHistoryIndex = historyWriteIndex;
+
+	++g_glRaytracingLighting.frameCounter;
+	return true;
+}
+
+static ID3D12Resource* glRaytracingResolveTLASForWorld(glRaytracingSceneHandle_t worldHandle)
+{
+	glRaytracingRenderWorld_t* world = glRaytracingFindWorld(worldHandle);
+	if (!world)
+		return nullptr;
+
+	if (!glRaytracingBuildDirtyMeshesInternal())
+		return nullptr;
+
+	if (!glRaytracingBuildSceneInternal(world))
+		return nullptr;
+
+	if (!world->tlasBuilt)
+		return nullptr;
+
+	return glRaytracingGetCurrentTLASBuffer(world)->resource.Get();
+}
+
+bool glRaytracingLightingInit(void)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	if (g_glRaytracingLighting.initialized)
+		return true;
+
+	if (!glRaytracingInitCmdContext())
+		return false;
+
+	if (!glRaytracingLightingCreateDescriptorHeap())
+		return false;
+
+	if (!glRaytracingLightingCreateRootSignatures())
+		return false;
+
+	if (!glRaytracingLightingCreateBuffers())
+		return false;
+
+	glRaytracingLightingCreatePersistentLightSRV();
+
+	if (!glRaytracingLightingCreateStateObject())
+		return false;
+
+	if (!glRaytracingLightingCreateShaderTables())
+		return false;
+
+	if (!glRaytracingLightingCreateDenoisePipeline())
+		return false;
+
+	if (!glRaytracingLightingCreateTemporalPipeline())
+		return false;
+
+	memset(&g_glRaytracingLighting.constants, 0, sizeof(g_glRaytracingLighting.constants));
+	glRaytracingSetIdentity4x4(g_glRaytracingLighting.constants.invViewProj);
+	glRaytracingSetIdentity4x4(g_glRaytracingLighting.constants.invViewMatrix);
+	glRaytracingSetIdentity4x4(g_glRaytracingLighting.constants.viewProj);
+	g_glRaytracingLighting.constants.ambientColor[0] = 0.08f;
+	g_glRaytracingLighting.constants.ambientColor[1] = 0.08f;
+	g_glRaytracingLighting.constants.ambientColor[2] = 0.09f;
+	g_glRaytracingLighting.constants.ambientColor[3] = 1.0f;
+	g_glRaytracingLighting.constants.enableSpecular = 1;
+	g_glRaytracingLighting.constants.enableHalfLambert = 1;
+	g_glRaytracingLighting.constants.normalReconstructZ = 1.0f;
+	g_glRaytracingLighting.constants.shadowBias = 1.5f;
+	g_glRaytracingLighting.constants.frameIndex = 0;
+	g_glRaytracingLighting.constants.samplesPerPixel = 1;
+	g_glRaytracingLighting.constants.maxBounces = 2;
+	g_glRaytracingLighting.constants.enableDenoiser = 1;
+	g_glRaytracingLighting.constants.denoisePassIndex = 0;
+	g_glRaytracingLighting.constants.denoiseStepWidth = 1.0f;
+	g_glRaytracingLighting.constants.denoiseStrength = 1.0f;
+	g_glRaytracingLighting.constants.denoisePhiColor = 8.0f;
+	g_glRaytracingLighting.constants.denoisePhiNormal = 64.0f;
+	g_glRaytracingLighting.constants.denoisePhiPosition = 0.045f;
+	g_glRaytracingLighting.constants.bumpStrength = 2.35f;
+	glRaytracingLightingResetDenoiseHistory();
+
+	glRaytracingLightingUpdateConstants();
+
+	g_glRaytracingLighting.initialized = true;
+	glRaytracingLog("glRaytracingLightingInit ok");
+	return true;
+}
+
+void glRaytracingLightingShutdown(void)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	if (!g_glRaytracingLighting.initialized)
+		return;
+
+	glRaytracingWaitIdle();
+	glRaytracingLightingUnmapUploadBuffers();
+	g_glRaytracingLighting = glRaytracingLightingState_t();
+}
+
+bool glRaytracingLightingIsInitialized(void)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+	return g_glRaytracingLighting.initialized;
+}
+
+void glRaytracingLightingClearLights(bool clearPersistant)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+	glRaytracingLightingEnsureLightKeyCount();
+
+	if (clearPersistant)
+	{
+		g_glRaytracingLighting.cpuLights.clear();
+		g_glRaytracingLighting.cpuLightKeys.clear();
+	}
+	else
+	{
+		size_t writeIndex = 0;
+
+		for (size_t i = 0; i < g_glRaytracingLighting.cpuLights.size(); ++i)
+		{
+			const uint32_t lightKey = g_glRaytracingLighting.cpuLightKeys[i];
+
+			// Preserve normal persistent lights and renderer-managed geometry emitters.
+			// This prevents the depth-fill emissive bridge from deleting ordinary
+			// non-persistent point/spot lights by accident, and it keeps discovered
+			// geometry emitters alive when their source surface is off-screen.
+			if (g_glRaytracingLighting.cpuLights[i].persistant != 0.0f ||
+				glRaytracingLightKeyIsGeometryEmissive(lightKey))
+			{
+				if (writeIndex != i)
+				{
+					g_glRaytracingLighting.cpuLights[writeIndex] = g_glRaytracingLighting.cpuLights[i];
+					g_glRaytracingLighting.cpuLightKeys[writeIndex] = lightKey;
+				}
+				++writeIndex;
+			}
+		}
+
+		g_glRaytracingLighting.cpuLights.resize(writeIndex);
+		g_glRaytracingLighting.cpuLightKeys.resize(writeIndex);
+	}
+
+	g_glRaytracingLighting.constants.lightCount =
+		(uint32_t)g_glRaytracingLighting.cpuLights.size();
+
+	if (clearPersistant)
+		glRaytracingLightingResetDenoiseHistory();
+
+	glRaytracingLightingUpdateLights();
+	glRaytracingLightingUpdateConstants();
+}
+
+bool glRaytracingLightingAddLight(const glRaytracingLight_t* light)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	if (!g_glRaytracingLighting.initialized || !light)
+		return false;
+
+	glRaytracingLightingEnsureLightKeyCount();
+
+	if (g_glRaytracingLighting.cpuLights.size() >= GL_RAYTRACING_MAX_LIGHTS)
+		return false;
+
+	const bool persistentLight = (light->persistant > 0.0f);
+
+	g_glRaytracingLighting.cpuLights.push_back(*light);
+	g_glRaytracingLighting.cpuLightKeys.push_back(GL_RAYTRACING_LIGHT_KEY_NONE);
+	g_glRaytracingLighting.constants.lightCount = (uint32_t)g_glRaytracingLighting.cpuLights.size();
+
+	// Positive persistent/static lights invalidate accumulation. Negative
+	// persist tags are renderer-managed metadata and must not reset every frame.
+	if (persistentLight)
+		glRaytracingLightingResetDenoiseHistory();
+
+	glRaytracingLightingUpdateLights();
+	glRaytracingLightingUpdateConstants();
+	return true;
+}
+
+bool glRaytracingLightingAddOrUpdateGeometryEmissiveLight(uint32_t key, const glRaytracingLight_t* light)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	if (!g_glRaytracingLighting.initialized || !light)
+		return false;
+
+	glRaytracingLightingEnsureLightKeyCount();
+
+	const uint32_t geometryKey = glRaytracingMakeGeometryEmissiveLightKey(key);
+	glRaytracingLight_t taggedLight = *light;
+	taggedLight.persistant = GL_RAYTRACING_LIGHT_PERSISTANT_GEOMETRY_EMISSIVE;
+
+	for (size_t i = 0; i < g_glRaytracingLighting.cpuLightKeys.size(); ++i)
+	{
+		if (g_glRaytracingLighting.cpuLightKeys[i] != geometryKey)
+			continue;
+
+		if (memcmp(&g_glRaytracingLighting.cpuLights[i], &taggedLight, sizeof(taggedLight)) != 0)
+		{
+			g_glRaytracingLighting.cpuLights[i] = taggedLight;
+			glRaytracingLightingUpdateLights();
+			glRaytracingLightingUpdateConstants();
+		}
+		return true;
+	}
+
+	if (g_glRaytracingLighting.cpuLights.size() >= GL_RAYTRACING_MAX_LIGHTS)
+		return false;
+
+	g_glRaytracingLighting.cpuLights.push_back(taggedLight);
+	g_glRaytracingLighting.cpuLightKeys.push_back(geometryKey);
+	g_glRaytracingLighting.constants.lightCount = (uint32_t)g_glRaytracingLighting.cpuLights.size();
+
+	// Geometry emitters are discovered from draw surfaces. Do not reset denoise
+	// history when they are first seen or re-seen; otherwise camera movement and
+	// PVS changes keep the path tracer permanently noisy.
+	glRaytracingLightingUpdateLights();
+	glRaytracingLightingUpdateConstants();
+	return true;
+}
+
+void glRaytracingLightingClearGeometryEmissiveLights(void)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+	glRaytracingLightingEnsureLightKeyCount();
+
+	size_t writeIndex = 0;
+	for (size_t i = 0; i < g_glRaytracingLighting.cpuLights.size(); ++i)
+	{
+		const uint32_t lightKey = g_glRaytracingLighting.cpuLightKeys[i];
+		if (glRaytracingLightKeyIsGeometryEmissive(lightKey))
+			continue;
+
+		if (writeIndex != i)
+		{
+			g_glRaytracingLighting.cpuLights[writeIndex] = g_glRaytracingLighting.cpuLights[i];
+			g_glRaytracingLighting.cpuLightKeys[writeIndex] = lightKey;
+		}
+		++writeIndex;
+	}
+
+	g_glRaytracingLighting.cpuLights.resize(writeIndex);
+	g_glRaytracingLighting.cpuLightKeys.resize(writeIndex);
+	g_glRaytracingLighting.constants.lightCount = (uint32_t)g_glRaytracingLighting.cpuLights.size();
+	glRaytracingLightingUpdateLights();
+	glRaytracingLightingUpdateConstants();
+}
+
+void glRaytracingLightingSetAmbient(float r, float g, float b, float intensity)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	if (g_glRaytracingLighting.constants.ambientColor[0] != r ||
+		g_glRaytracingLighting.constants.ambientColor[1] != g ||
+		g_glRaytracingLighting.constants.ambientColor[2] != b ||
+		g_glRaytracingLighting.constants.ambientColor[3] != intensity)
+	{
+		glRaytracingLightingResetDenoiseHistory();
+	}
+
+	g_glRaytracingLighting.constants.ambientColor[0] = r;
+	g_glRaytracingLighting.constants.ambientColor[1] = g;
+	g_glRaytracingLighting.constants.ambientColor[2] = b;
+	g_glRaytracingLighting.constants.ambientColor[3] = intensity;
+	glRaytracingLightingUpdateConstants();
+}
+
+void glRaytracingLightingSetCameraPosition(float x, float y, float z)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	// Camera position changes every frame while the player moves. Treat it as a
+	// normal frame constant, not a light/material change, or the temporal GI
+	// accumulator is reset exactly when the image needs it most.
+	g_glRaytracingLighting.constants.cameraPos[0] = x;
+	g_glRaytracingLighting.constants.cameraPos[1] = y;
+	g_glRaytracingLighting.constants.cameraPos[2] = z;
+	g_glRaytracingLighting.constants.cameraPos[3] = 1.0f;
+	glRaytracingLightingUpdateConstants();
+}
+
+void glRaytracingLightingSetInvViewProjMatrix(const float* m16)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	if (!m16)
+		return;
+
+	memcpy(g_glRaytracingLighting.constants.invViewProj, m16, sizeof(float) * 16);
+
+	if (!glRaytracingInvertMatrix4x4(m16, g_glRaytracingLighting.constants.viewProj))
+		glRaytracingSetIdentity4x4(g_glRaytracingLighting.constants.viewProj);
+
+	glRaytracingLightingUpdateConstants();
+}
+
+void glRaytracingLightingSetInvViewMatrix(const float* m16)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	if (!m16)
+		return;
+
+	memcpy(g_glRaytracingLighting.constants.invViewMatrix, m16, sizeof(float) * 16);
+	glRaytracingLightingUpdateConstants();
+}
+
+void glRaytracingLightingSetNormalReconstructSign(float signValue)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	if (g_glRaytracingLighting.constants.normalReconstructZ != signValue)
+		glRaytracingLightingResetDenoiseHistory();
+
+	g_glRaytracingLighting.constants.normalReconstructZ = signValue;
+	glRaytracingLightingUpdateConstants();
+}
+
+void glRaytracingLightingSetBumpStrength(float strength)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	strength = glRaytracingClamp<float>(strength, 0.0f, 8.0f);
+	if (g_glRaytracingLighting.constants.bumpStrength != strength)
+		glRaytracingLightingResetDenoiseHistory();
+
+	g_glRaytracingLighting.constants.bumpStrength = strength;
+	glRaytracingLightingUpdateConstants();
+}
+
+void glRaytracingLightingEnableSpecular(int enable)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	uint32_t value = enable ? 1u : 0u;
+	if (g_glRaytracingLighting.constants.enableSpecular != value)
+		glRaytracingLightingResetDenoiseHistory();
+
+	g_glRaytracingLighting.constants.enableSpecular = value;
+	glRaytracingLightingUpdateConstants();
+}
+
+void glRaytracingLightingEnableHalfLambert(int enable)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	uint32_t value = enable ? 1u : 0u;
+	if (g_glRaytracingLighting.constants.enableHalfLambert != value)
+		glRaytracingLightingResetDenoiseHistory();
+
+	g_glRaytracingLighting.constants.enableHalfLambert = value;
+	glRaytracingLightingUpdateConstants();
+}
+
+void glRaytracingLightingSetShadowBias(float bias)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	if (g_glRaytracingLighting.constants.shadowBias != bias)
+		glRaytracingLightingResetDenoiseHistory();
+
+	g_glRaytracingLighting.constants.shadowBias = bias;
+	glRaytracingLightingUpdateConstants();
+}
+
+void glRaytracingLightingSetPathTracingOptions(uint32_t samplesPerPixel, uint32_t maxBounces, int enableDenoiser, float denoiseStrength)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	samplesPerPixel = glRaytracingClamp<uint32_t>(samplesPerPixel ? samplesPerPixel : 1u, 1u, 8u);
+	maxBounces = glRaytracingClamp<uint32_t>(maxBounces ? maxBounces : 1u, 1u, 4u);
+	uint32_t denoiser = enableDenoiser ? 1u : 0u;
+	denoiseStrength = glRaytracingClamp<float>(denoiseStrength, 0.0f, 1.0f);
+
+	if (g_glRaytracingLighting.constants.samplesPerPixel != samplesPerPixel ||
+		g_glRaytracingLighting.constants.maxBounces != maxBounces ||
+		g_glRaytracingLighting.constants.enableDenoiser != denoiser ||
+		g_glRaytracingLighting.constants.denoiseStrength != denoiseStrength)
+	{
+		glRaytracingLightingResetDenoiseHistory();
+	}
+
+	g_glRaytracingLighting.constants.samplesPerPixel = samplesPerPixel;
+	g_glRaytracingLighting.constants.maxBounces = maxBounces;
+	g_glRaytracingLighting.constants.enableDenoiser = denoiser;
+	g_glRaytracingLighting.constants.denoiseStrength = denoiseStrength;
+	glRaytracingLightingUpdateConstants();
+}
+
+void glRaytracingLightingSetDenoiseTuning(float phiColor, float phiNormal, float phiPosition)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	phiColor = glRaytracingClamp<float>(phiColor, 0.001f, 64.0f);
+	phiNormal = glRaytracingClamp<float>(phiNormal, 1.0f, 128.0f);
+	phiPosition = glRaytracingClamp<float>(phiPosition, 0.001f, 4.0f);
+
+	if (g_glRaytracingLighting.constants.denoisePhiColor != phiColor ||
+		g_glRaytracingLighting.constants.denoisePhiNormal != phiNormal ||
+		g_glRaytracingLighting.constants.denoisePhiPosition != phiPosition)
+	{
+		glRaytracingLightingResetDenoiseHistory();
+	}
+
+	g_glRaytracingLighting.constants.denoisePhiColor = phiColor;
+	g_glRaytracingLighting.constants.denoisePhiNormal = phiNormal;
+	g_glRaytracingLighting.constants.denoisePhiPosition = phiPosition;
+	glRaytracingLightingUpdateConstants();
+}
+
+void glRaytracingLightingSetVolumetricScattering(glRaytracingLight_t* light, float strength)
+{
+	if (!light)
+		return;
+
+	// This uses glRaytracingLight_t::pad1, which is renamed to
+	// Light::volumetricScattering in HLSL.  Keeping the existing pad slot avoids
+	// changing the StructuredBuffer stride for already-integrated callers.
+	light->pad1 = glRaytracingClamp<float>(strength, 0.0f, 16.0f);
+}
+
+void glRaytracingLightingSetExternalDenoiser(int enabled)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	const bool newValue = enabled ? true : false;
+	if (g_glRaytracingLighting.externalDenoiser != newValue)
+		glRaytracingLightingResetDenoiseHistory();
+
+	g_glRaytracingLighting.externalDenoiser = newValue;
+}
+
+void glRaytracingLightingResetTemporalHistory(void)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	glRaytracingLightingResetDenoiseHistory();
+	glRaytracingLightingUpdateConstants();
+}
+
+void glRaytracingLightingUseExternalDenoiser(int enabled)
+{
+	glRaytracingLightingSetExternalDenoiser(enabled);
+}
+
+
+void glRaytracingLightingSetEmissiveInput(ID3D12Resource* texture, DXGI_FORMAT format)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	g_glRaytracingLighting.emissiveTexture = texture;
+	g_glRaytracingLighting.emissiveFormat = (format == DXGI_FORMAT_UNKNOWN)
+		? DXGI_FORMAT_R16G16B16A16_FLOAT
+		: format;
+}
+
+void glRaytracingLightingSetSpecularInput(ID3D12Resource* texture, DXGI_FORMAT format)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	DXGI_FORMAT newFormat = (format == DXGI_FORMAT_UNKNOWN)
+		? DXGI_FORMAT_R8G8B8A8_UNORM
+		: format;
+
+	// The G-buffer specular resource is normally double-buffered, so the texture
+	// pointer can change every frame even when the material data is stable.  Do not
+	// reset temporal GI just because the current frame resource rotated; only a
+	// real format change invalidates the accumulator.
+	if (g_glRaytracingLighting.specularFormat != newFormat)
+	{
+		glRaytracingLightingResetDenoiseHistory();
+	}
+
+	g_glRaytracingLighting.specularTexture = texture;
+	g_glRaytracingLighting.specularFormat = newFormat;
+}
+
+bool glRaytracingLightingExecuteForScene(const glRaytracingLightingPassDesc_t* pass, glRaytracingSceneHandle_t worldHandle)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	ID3D12Resource* topLevelAS = glRaytracingResolveTLASForWorld(worldHandle);
+	if (!topLevelAS)
+		return false;
+
+	return glRaytracingLightingExecuteInternal(pass, topLevelAS);
+}
+
+glRaytracingLight_t glRaytracingLightingMakePointLight(
+	float px, float py, float pz,
+	float radiusX, float radiusY, float radiusZ,
+	float r, float g, float b,
+	float intensity)
+{
+	glRaytracingLight_t l = {};
+	float ax = (radiusX < 0.0f) ? -radiusX : radiusX;
+	float ay = (radiusY < 0.0f) ? -radiusY : radiusY;
+	float az = (radiusZ < 0.0f) ? -radiusZ : radiusZ;
+	float maxRadius = ax;
+	if (ay > maxRadius) maxRadius = ay;
+	if (az > maxRadius) maxRadius = az;
+	if (maxRadius <= 0.0f) maxRadius = 1e-4f;
+
+	if (ax <= 0.0f) ax = maxRadius;
+	if (ay <= 0.0f) ay = maxRadius;
+	if (az <= 0.0f) az = maxRadius;
+
+	l.position.x = px;
+	l.position.y = py;
+	l.position.z = pz;
+
+	// Keep radius populated as a scalar fallback/max range, but point lights now
+	// attenuate using pointRadius.x/y/z in the ray generation shader.
+	l.radius = maxRadius;
+	l.pointRadius.x = ax;
+	l.pointRadius.y = ay;
+	l.pointRadius.z = az;
+	l.pointRadiusPad = 0.0f;
+	l.falloffPower = 1.0f;
+
+	l.color.x = r;
+	l.color.y = g;
+	l.color.z = b;
+	l.intensity = intensity;
+
+	l.normal.x = 0.0f;
+	l.normal.y = 0.0f;
+	l.normal.z = 1.0f;
+	l.type = GL_RAYTRACING_LIGHT_TYPE_POINT;
+
+	l.axisU.x = 1.0f;
+	l.axisU.y = 0.0f;
+	l.axisU.z = 0.0f;
+	l.halfWidth = 0.0f;
+
+	l.axisV.x = 0.0f;
+	l.axisV.y = 1.0f;
+	l.axisV.z = 0.0f;
+	l.halfHeight = 0.0f;
+
+	l.samples = 1;
+	l.twoSided = 0;
+	l.persistant = 0.0f;
+	l.pad1 = 0.0f; // volumetric scattering disabled by default.
+	return l;
+}
+
+
+glRaytracingLight_t glRaytracingLightingMakeSpotLight(
+	float px, float py, float pz,
+	float dx, float dy, float dz,
+	float ux, float uy, float uz,
+	float vx, float vy, float vz,
+	float nearPlane,
+	float farPlane,
+	float tanHalfWidth,
+	float tanHalfHeight,
+	float r, float g, float b,
+	float intensity,
+	uint32_t samples)
+{
+	glRaytracingLight_t l = {};
+
+	glRaytracingNormalize3(dx, dy, dz);
+
+	// Make U perpendicular to D.
+	{
+		const float du = dx * ux + dy * uy + dz * uz;
+		ux -= dx * du;
+		uy -= dy * du;
+		uz -= dz * du;
+
+		const float uLenSq = ux * ux + uy * uy + uz * uz;
+		if (uLenSq <= 1e-20f)
+		{
+			const float absDz = (dz < 0.0f) ? -dz : dz;
+			if (absDz < 0.999f)
+			{
+				glRaytracingCross3(0.0f, 0.0f, 1.0f, dx, dy, dz, ux, uy, uz);
+			}
+			else
+			{
+				glRaytracingCross3(0.0f, 1.0f, 0.0f, dx, dy, dz, ux, uy, uz);
+			}
+		}
+		glRaytracingNormalize3(ux, uy, uz);
+	}
+
+	// Rebuild V from D x U so the basis is orthonormal, while preserving the
+	// sign of the caller-provided V whenever possible.
+	{
+		float builtVx, builtVy, builtVz;
+		glRaytracingCross3(dx, dy, dz, ux, uy, uz, builtVx, builtVy, builtVz);
+		glRaytracingNormalize3(builtVx, builtVy, builtVz);
+
+		const float sign = builtVx * vx + builtVy * vy + builtVz * vz;
+		if (sign < 0.0f)
+		{
+			builtVx = -builtVx;
+			builtVy = -builtVy;
+			builtVz = -builtVz;
+		}
+
+		vx = builtVx;
+		vy = builtVy;
+		vz = builtVz;
+	}
+
+	if (nearPlane < 0.0f)
+		nearPlane = 0.0f;
+	if (farPlane <= nearPlane)
+		farPlane = nearPlane + 1e-3f;
+
+	if (tanHalfWidth < 0.0f)  tanHalfWidth = -tanHalfWidth;
+	if (tanHalfHeight < 0.0f) tanHalfHeight = -tanHalfHeight;
+
+	if (tanHalfWidth <= 1e-4f)
+		tanHalfWidth = 1e-4f;
+	if (tanHalfHeight <= 1e-4f)
+		tanHalfHeight = 1e-4f;
+
+	l.position.x = px;
+	l.position.y = py;
+	l.position.z = pz;
+
+	// For spot lights, radius stores the far clip distance while pointRadius.x
+	// stores the near clip distance.
+	l.radius = farPlane;
+	l.pointRadius.x = nearPlane;
+	l.pointRadius.y = 0.0f;
+	l.pointRadius.z = 0.0f;
+	l.pointRadiusPad = 0.0f;
+	l.falloffPower = 1.0f;
+
+	l.color.x = r;
+	l.color.y = g;
+	l.color.z = b;
+	l.intensity = intensity;
+
+	l.normal.x = dx;
+	l.normal.y = dy;
+	l.normal.z = dz;
+	l.type = GL_RAYTRACING_LIGHT_TYPE_SPOT;
+
+	l.axisU.x = ux;
+	l.axisU.y = uy;
+	l.axisU.z = uz;
+	l.halfWidth = tanHalfWidth;
+
+	l.axisV.x = vx;
+	l.axisV.y = vy;
+	l.axisV.z = vz;
+	l.halfHeight = tanHalfHeight;
+
+	l.samples = samples ? samples : 1u;
+	l.twoSided = 0;
+	l.persistant = 0.0f;
+	l.pad1 = 0.0f; // volumetric scattering disabled by default.
+
+	return l;
+}
+
+glRaytracingLight_t glRaytracingLightingMakeRectLight(
+	float px, float py, float pz,
+	float nx, float ny, float nz,
+	float ux, float uy, float uz,
+	float vx, float vy, float vz,
+	float halfWidth, float halfHeight,
+	float r, float g, float b,
+	float intensity,
+	uint32_t samples,
+	uint32_t twoSided)
+{
+	glRaytracingLight_t l = {};
+
+	glRaytracingNormalize3(nx, ny, nz);
+	glRaytracingNormalize3(ux, uy, uz);
+	glRaytracingNormalize3(vx, vy, vz);
+
+	if ((nx == 0.0f && ny == 0.0f && nz == 0.0f) &&
+		!((ux == 0.0f && uy == 0.0f && uz == 0.0f) ||
+			(vx == 0.0f && vy == 0.0f && vz == 0.0f)))
+	{
+		glRaytracingCross3(ux, uy, uz, vx, vy, vz, nx, ny, nz);
+		glRaytracingNormalize3(nx, ny, nz);
+	}
+
+	l.position.x = px;
+	l.position.y = py;
+	l.position.z = pz;
+
+	// Reuse radius as influence/falloff range for the rect light.
+	l.radius = (halfWidth > halfHeight ? halfWidth : halfHeight) * 6.0f;
+	l.pointRadius.x = l.radius;
+	l.pointRadius.y = l.radius;
+	l.pointRadius.z = l.radius;
+	l.pointRadiusPad = 0.0f;
+	l.falloffPower = 1.0f;
+
+	l.color.x = r;
+	l.color.y = g;
+	l.color.z = b;
+	l.intensity = intensity;
+
+	l.normal.x = nx;
+	l.normal.y = ny;
+	l.normal.z = nz;
+	l.type = GL_RAYTRACING_LIGHT_TYPE_RECT;
+
+	l.axisU.x = ux;
+	l.axisU.y = uy;
+	l.axisU.z = uz;
+	l.halfWidth = halfWidth;
+
+	l.axisV.x = vx;
+	l.axisV.y = vy;
+	l.axisV.z = vz;
+	l.halfHeight = halfHeight;
+
+	l.samples = samples ? samples : 16u;
+	if (l.samples > 16u) l.samples = 16u;
+	l.twoSided = twoSided ? 1u : 0u;
+	l.persistant = 0.0f;
+	l.pad1 = 0.0f; // volumetric scattering disabled by default.
+
+	return l;
+}
+
+uint32_t glRaytracingLightingGetLightCount(void)
+{
+	return (uint32_t)g_glRaytracingLighting.cpuLights.size();
+}
+
+int glRaytracingSetInstanceVisibilityUnlocked(
+	glRaytracingRenderWorld_t* world,
+	glRaytracingInstanceHandle_t instanceHandle,
+	int visible)
+{
+	if (!world || !world->alive)
+		return 0;
+
+	glRaytracingInstanceRecord_t* inst =
+		glRaytracingFindInstance(world, instanceHandle);
+
+	if (!inst || !inst->alive)
+		return 0;
+
+	const uint32_t newMask = visible ? 0xFFu : 0u;
+
+	if ((((uint32_t)inst->descCpu.mask) & 0xFFu) == newMask)
+		return 1;
+
+	inst->descCpu.mask = newMask;
+	inst->dirty = 1;
+
+	glRaytracingMarkWorldNeedsUpdate(world);
+	return 1;
+}
+
+static void glRaytracingSetAllInstancesVisibleUnlocked(
+	glRaytracingRenderWorld_t* world,
+	int visible)
+{
+	if (!world || !world->alive)
+		return;
+
+	const uint32_t newMask = visible ? 0xFFu : 0u;
+	int changed = 0;
+
+	for (size_t i = 0; i < world->instances.size(); ++i)
+	{
+		glRaytracingInstanceRecord_t& inst = world->instances[i];
+
+		if (!inst.alive)
+			continue;
+
+		const int wasVisible = inst.descCpu.mask != 0;
+		if (wasVisible == (visible != 0))
+			continue;
+
+		inst.descCpu.mask = newMask;
+		inst.dirty = 1;
+		changed = 1;
+	}
+
+	if (changed)
+		glRaytracingMarkWorldNeedsUpdate(world);
+}
+
+int glRaytracingSetInstanceVisibilityInScene(
+	glRaytracingSceneHandle_t sceneHandle,
+	glRaytracingInstanceHandle_t instanceHandle,
+	int visible)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	if (!g_glRaytracingScene.initialized)
+		return 0;
+
+	glRaytracingRenderWorld_t* world = glRaytracingFindWorld(sceneHandle);
+	return glRaytracingSetInstanceVisibilityUnlocked(
+		world,
+		instanceHandle,
+		visible ? 1 : 0);
+}
+
+int glRaytracingGetInstanceVisibilityInScene(
+	glRaytracingSceneHandle_t sceneHandle,
+	glRaytracingInstanceHandle_t instanceHandle)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	if (!g_glRaytracingScene.initialized)
+		return 0;
+
+	glRaytracingRenderWorld_t* world = glRaytracingFindWorld(sceneHandle);
+	if (!world)
+		return 0;
+
+	glRaytracingInstanceRecord_t* inst =
+		glRaytracingFindInstance(world, instanceHandle);
+
+	if (!inst || !inst->alive)
+		return 0;
+
+	return inst->descCpu.mask != 0 ? 1 : 0;
+}
+
+void glRaytracingHideAllInstancesInScene(glRaytracingSceneHandle_t sceneHandle)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	if (!g_glRaytracingScene.initialized)
+		return;
+
+	glRaytracingRenderWorld_t* world = glRaytracingFindWorld(sceneHandle);
+	glRaytracingSetAllInstancesVisibleUnlocked(world, 0);
+}
+
+void glRaytracingShowAllInstancesInScene(glRaytracingSceneHandle_t sceneHandle)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	if (!g_glRaytracingScene.initialized)
+		return;
+
+	glRaytracingRenderWorld_t* world = glRaytracingFindWorld(sceneHandle);
+	glRaytracingSetAllInstancesVisibleUnlocked(world, 1);
+}
+
+void glRaytracingHideAllInstances(void)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	if (!g_glRaytracingScene.initialized)
+		return;
+
+	for (int i = 0; i < GL_RAYTRACING_MAX_RENDER_WORLDS; ++i)
+		glRaytracingSetAllInstancesVisibleUnlocked(&g_glRaytracingScene.worlds[i], 0);
+}
+
+void glRaytracingShowAllInstances(void)
+{
+	std::lock_guard<std::mutex> lock(g_glRaytracingMutex);
+
+	if (!g_glRaytracingScene.initialized)
+		return;
+
+	for (int i = 0; i < GL_RAYTRACING_MAX_RENDER_WORLDS; ++i)
+		glRaytracingSetAllInstancesVisibleUnlocked(&g_glRaytracingScene.worlds[i], 1);
+}
diff --git a/neo/engine/opengl/opengl.h b/neo/engine/opengl/opengl.h
index 91b9e973..4f6449e5 100644
--- a/neo/engine/opengl/opengl.h
+++ b/neo/engine/opengl/opengl.h
@@ -2392,6 +2392,9 @@ void glRaytracingLightingSetVolumetricScattering(glRaytracingLight_t* light, flo
 #ifndef GL_GLOW_MAP_BINDING_QD3D12
 #define GL_GLOW_MAP_BINDING_QD3D12 0x6005
 #endif
+#ifndef GL_QD3D12_TERRAIN_BLEND
+#define GL_QD3D12_TERRAIN_BLEND 0x600F
+#endif
 
 // Glow-map material tagging / binding. Tagging is optional but lets the shim
 // auto-discover a glow map from bound texture units. Explicit binding wins.
@@ -2401,6 +2404,15 @@ void APIENTRY glBindGlowMapTexture(GLuint texture);                  // 0 disabl
 void APIENTRY glGlowMapTexture(GLuint texture);                      // alias
 void APIENTRY glGlowMapStrengthf(GLfloat strength);                  // default 1.0; >1 allows overbright emission
 
+// Single-pass terrain splat preview/runtime path. The shader samples up to four
+// layer textures and blends them with RGBA vertex colors as normalized weights.
+void APIENTRY glTerrainBlendEnableQD3D12(GLboolean enable);
+void APIENTRY glEnableTerrainBlendQD3D12(GLboolean enable);
+void APIENTRY glTerrainLayerTextureQD3D12(GLuint layer, GLuint texture);
+void APIENTRY glTerrainLayerNormalTextureQD3D12(GLuint layer, GLuint texture);
+void APIENTRY glTerrainWeightTextureQD3D12(GLuint texture);
+void APIENTRY glTerrainBlendOpacityQD3D12(GLfloat opacity);
+
 int APIENTRY glSetTopLevelAccelStructureVisible(
 	glRaytracingSceneHandle_t scene,
 	uint32_t topLevelHandle,
diff --git a/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/CullingThreadpool.cpp b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/CullingThreadpool.cpp
new file mode 100644
index 00000000..2a584473
--- /dev/null
+++ b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/CullingThreadpool.cpp
@@ -0,0 +1,472 @@
+////////////////////////////////////////////////////////////////////////////////
+// Copyright 2017 Intel Corporation
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License.  You may obtain a copy
+// of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+// License for the specific language governing permissions and limitations
+// under the License.
+////////////////////////////////////////////////////////////////////////////////
+#include <assert.h>
+#include "CullingThreadpool.h"
+
+#define SAFE_DELETE(X) {if (X != nullptr) delete X; X = nullptr;}
+#define SAFE_DELETE_ARRAY(X) {if (X != nullptr) delete[] X; X = nullptr;}
+
+template<class T> CullingThreadpool::StateData<T>::StateData(unsigned int maxJobs) :
+	mMaxJobs(maxJobs),
+	mCurrentIdx(~0)
+{
+	mData = new T[mMaxJobs];
+}
+
+template<class T> CullingThreadpool::StateData<T>::~StateData() 
+{
+	SAFE_DELETE_ARRAY(mData);
+}
+
+template<class T> void CullingThreadpool::StateData<T>::AddData(const T &data) 
+{ 
+	mCurrentIdx++; mData[mCurrentIdx % mMaxJobs] = data; 
+}
+
+template<class T> const T *CullingThreadpool::StateData<T>::GetData() const
+{ 
+	return &mData[mCurrentIdx % mMaxJobs];
+}
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Helper class: Mostly lockless queue for render jobs
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+CullingThreadpool::RenderJobQueue::RenderJobQueue(unsigned int nBins, unsigned int maxJobs) : 
+	mNumBins(nBins),
+	mMaxJobs(maxJobs)
+{
+	mRenderPtrs = new std::atomic_uint[mNumBins];
+	mBinMutexes = new std::atomic_uint[mNumBins];
+	for (unsigned int i = 0; i < mNumBins; ++i)
+		mBinMutexes[i] = 0;
+
+	mJobs = new Job[mMaxJobs];
+	for (unsigned int i = 0; i < mMaxJobs; ++i)
+		mJobs[i].mRenderJobs = new TriList[mNumBins];
+
+	// Compute worst case job size (we allocate memory for the worst case)
+	const unsigned int TriSize = 3 * 3;
+	const unsigned int MaxTrisPerJob = TRIS_PER_JOB * 6;
+	const unsigned int MaxJobSize = MaxTrisPerJob * TriSize;
+	mTrilistData = new float[MaxJobSize * mMaxJobs * mNumBins];
+
+	// Setup trilist objects used for binning
+	for (unsigned int i = 0; i < mMaxJobs; ++i)
+	{
+		for (unsigned int j = 0; j < mNumBins; ++j)
+		{
+			int idx = i*mNumBins + j;
+			TriList &tList = mJobs[i].mRenderJobs[j];
+			tList.mNumTriangles = MaxTrisPerJob;
+			tList.mTriIdx = 0;
+			tList.mPtr = mTrilistData + idx*MaxJobSize;
+		}
+	}
+
+	// Clear render queue
+	Reset();
+}
+
+CullingThreadpool::RenderJobQueue::~RenderJobQueue()
+{
+	SAFE_DELETE_ARRAY(mRenderPtrs);
+	SAFE_DELETE_ARRAY(mBinMutexes);
+	for (unsigned int i = 0; i < mMaxJobs; ++i)
+		SAFE_DELETE_ARRAY(mJobs[i].mRenderJobs);
+	SAFE_DELETE_ARRAY(mJobs);
+	SAFE_DELETE_ARRAY(mTrilistData);
+}
+
+inline unsigned int CullingThreadpool::RenderJobQueue::GetMinRenderPtr() const
+{
+	unsigned int minRenderPtr = mRenderPtrs[0];
+	for (unsigned int i = 1; i < mNumBins; ++i)
+	{
+		unsigned int renderPtr = mRenderPtrs[i];
+		minRenderPtr = renderPtr < minRenderPtr ? renderPtr : minRenderPtr;
+	}
+	return minRenderPtr;
+}
+
+inline void CullingThreadpool::RenderJobQueue::AdvanceRenderJob(int binIdx)
+{
+	mRenderPtrs[binIdx]++;
+	mBinMutexes[binIdx] = 0;
+}
+
+inline unsigned int CullingThreadpool::RenderJobQueue::GetBestGlobalQueue() const
+{
+	// Find least advanced queue
+	unsigned int bestBin = ~0, bestPtr = mWritePtr;
+	for (unsigned int i = 0; i < mNumBins; ++i)
+	{
+		if (mRenderPtrs[i] < bestPtr && mBinMutexes[i] == 0)
+		{
+			bestBin = i;
+			bestPtr = mRenderPtrs[i];
+		}
+	}
+	return bestBin;
+}
+
+inline bool CullingThreadpool::RenderJobQueue::IsPipelineEmpty() const
+{
+	return GetMinRenderPtr() == mWritePtr;
+}
+
+inline bool CullingThreadpool::RenderJobQueue::CanWrite() const
+{
+	return mWritePtr - GetMinRenderPtr() < mMaxJobs;
+}
+
+inline bool CullingThreadpool::RenderJobQueue::CanBin() const
+{
+	return mBinningPtr < mWritePtr && mBinningPtr - GetMinRenderPtr() < mMaxJobs;
+}
+
+inline CullingThreadpool::RenderJobQueue::Job *CullingThreadpool::RenderJobQueue::GetWriteJob()
+{
+	return &mJobs[mWritePtr % mMaxJobs];
+}
+
+inline void CullingThreadpool::RenderJobQueue::AdvanceWriteJob()
+{
+	mWritePtr++;
+}
+
+inline CullingThreadpool::RenderJobQueue::Job *CullingThreadpool::RenderJobQueue::GetBinningJob()
+{
+	unsigned int binningPtr = mBinningPtr;
+	if (binningPtr < mWritePtr && binningPtr - GetMinRenderPtr() < mMaxJobs)
+	{
+		if (mBinningPtr.compare_exchange_strong(binningPtr, binningPtr + 1))
+		{
+			mJobs[binningPtr % mMaxJobs].mBinningJobStartedIdx = binningPtr;
+			return &mJobs[binningPtr % mMaxJobs];
+		}
+	}
+	return nullptr;
+}
+
+inline void CullingThreadpool::RenderJobQueue::FinishedBinningJob(Job *job)
+{
+	job->mBinningJobCompletedIdx = job->mBinningJobStartedIdx;
+}
+
+inline CullingThreadpool::RenderJobQueue::Job *CullingThreadpool::RenderJobQueue::GetRenderJob(int binIdx)
+{
+	// Attempt to lock bin mutex
+	unsigned int expected = 0;
+	if (!mBinMutexes[binIdx].compare_exchange_strong(expected, 1))
+		return nullptr;
+
+	// Check any items in the queue, and bail if empty
+	if (mRenderPtrs[binIdx] != mJobs[mRenderPtrs[binIdx] % mMaxJobs].mBinningJobCompletedIdx)
+	{
+		mBinMutexes[binIdx] = 0;
+		return nullptr;
+	}
+
+	return &mJobs[mRenderPtrs[binIdx] % mMaxJobs];
+}
+
+void CullingThreadpool::RenderJobQueue::Reset()
+{
+	mWritePtr = 0;
+	mBinningPtr = 0;
+
+	for (unsigned int i = 0; i < mNumBins; ++i)
+		mRenderPtrs[i] = 0;
+
+	for (unsigned int i = 0; i < mMaxJobs; ++i)
+	{
+		mJobs[i].mBinningJobCompletedIdx = -1;
+		mJobs[i].mBinningJobStartedIdx = -1;
+	}
+}
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Culling threadpool private helper functions
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+void CullingThreadpool::SetupScissors()
+{
+	unsigned int width, height;
+	mMOC->GetResolution(width, height);
+
+	unsigned int binWidth;
+	unsigned int binHeight;
+	mMOC->ComputeBinWidthHeight(mBinsW, mBinsH, binWidth, binHeight);
+
+	for (unsigned int ty = 0; ty < mBinsH; ++ty)
+	{
+		for (unsigned int tx = 0; tx < mBinsW; ++tx)
+		{
+			unsigned int threadIdx = tx + ty*mBinsW;
+
+			// Adjust rects on final row / col to match resolution
+			mRects[threadIdx].mMinX = tx*binWidth;
+			mRects[threadIdx].mMaxX = tx + 1 == mBinsW ? width : (tx + 1) * binWidth;
+			mRects[threadIdx].mMinY = ty * binHeight;
+			mRects[threadIdx].mMaxY = ty + 1 == mBinsH ? height : (ty + 1) * binHeight;
+		}
+	}
+}
+
+void CullingThreadpool::ThreadRun(CullingThreadpool *threadPool, unsigned int threadId)
+{ 
+	threadPool->ThreadMain(threadId); 
+}
+
+void CullingThreadpool::ThreadMain(unsigned int threadIdx)
+{
+	while (true)
+	{
+		bool threadIsIdle = true;
+		unsigned int threadBinIdx = threadIdx;
+
+		// Wait for threads to be woken up (low CPU load sleep)
+		std::unique_lock<std::mutex> lock(mSuspendedMutex);
+		mNumSuspendedThreads++;
+		mSuspendedCV.wait(lock, [&] {return !mSuspendThreads; });
+		mNumSuspendedThreads--;
+		lock.unlock();
+
+		// Loop until suspended again
+		while (!mSuspendThreads || !threadIsIdle)
+		{
+			if (mKillThreads)
+				return;
+
+			threadIsIdle = false;
+
+			// Prio 1: Process any render jobs local to this thread
+			unsigned int binIdx = threadBinIdx;
+			threadBinIdx = threadBinIdx + mNumThreads < mNumBins ? threadBinIdx + mNumThreads : threadIdx;
+			RenderJobQueue::Job *job = mRenderQueue->GetRenderJob(binIdx);
+			if (job != nullptr)
+			{
+				if (job->mRenderJobs[binIdx].mTriIdx > 0)
+					mMOC->RenderTrilist(job->mRenderJobs[binIdx], &mRects[binIdx]);
+
+				mRenderQueue->AdvanceRenderJob(binIdx);
+				continue;
+			}
+
+			// Prio 2: Process any outstanding setup/binning jobs
+			if (mRenderQueue->CanBin())
+			{
+				// If no more rasterization jobs, get next binning job
+				RenderJobQueue::Job *job = mRenderQueue->GetBinningJob();
+				if (job != nullptr)
+				{
+					RenderJobQueue::BinningJob &sjob = job->mBinningJob;
+					for (unsigned int i = 0; i < mNumBins; ++i)
+						job->mRenderJobs[i].mTriIdx = 0;
+					mMOC->BinTriangles(sjob.mVerts, sjob.mTris, sjob.nTris, job->mRenderJobs, mBinsW, mBinsH, sjob.mMatrix, sjob.mBfWinding, sjob.mClipPlanes, *sjob.mVtxLayout);
+					mRenderQueue->FinishedBinningJob(job);
+				}
+				continue;
+			}
+
+			// Prio 3: No work is available, work steal from another thread's queue
+			if (mNumBins > mNumThreads)
+			{
+				binIdx = mRenderQueue->GetBestGlobalQueue();
+				if (binIdx < mRenderQueue->mNumBins)
+				{
+					RenderJobQueue::Job *job = mRenderQueue->GetRenderJob(binIdx);
+					if (job != nullptr)
+					{
+						if (job->mRenderJobs[binIdx].mTriIdx > 0)
+							mMOC->RenderTrilist(job->mRenderJobs[binIdx], &mRects[binIdx]);
+
+						mRenderQueue->AdvanceRenderJob(binIdx);
+					}
+					continue;
+				}
+			}
+
+			// No work available: Yield this thread
+			std::this_thread::yield();
+			threadIsIdle = true;
+		}
+	}
+}
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Culling threadpool public API, similar to the MaskedOcclusionCulling class
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+CullingThreadpool::CullingThreadpool(unsigned int numThreads, unsigned int binsW, unsigned int binsH, unsigned int maxJobs) :
+	mNumThreads(numThreads),
+	mMaxJobs(maxJobs),
+	mBinsW(binsW),
+	mBinsH(binsH),
+	mKillThreads(false),
+	mSuspendThreads(true),
+	mNumSuspendedThreads(0),
+	mModelToClipMatrices(maxJobs),
+	mVertexLayouts(maxJobs),
+	mMOC(nullptr)
+{
+	mNumBins = mBinsW*mBinsH;
+	assert(mNumBins >= mNumThreads);	// Having less bins than threads is a bad idea!
+
+	mRects = new ScissorRect[mNumBins];
+	mRenderQueue = new RenderJobQueue(mNumBins, mMaxJobs);
+
+	// Add default vertex layout and matrix
+	mVertexLayouts.AddData(VertexLayout(16, 4, 12));
+	mCurrentMatrix = nullptr;
+
+	mThreads = new std::thread[mNumThreads];
+	for (unsigned int i = 0; i < mNumThreads; ++i)
+		mThreads[i] = std::thread(ThreadRun, this, i);
+
+}
+
+CullingThreadpool::~CullingThreadpool()
+{
+	// Wait for threads to terminate
+	if (mThreads != nullptr || !mKillThreads)
+	{
+		WakeThreads();
+		mKillThreads = true;
+		for (unsigned int i = 0; i < mNumThreads; ++i)
+			mThreads[i].join();
+
+	}
+
+	// Free memory
+	SAFE_DELETE(mRenderQueue);
+	SAFE_DELETE_ARRAY(mRects);
+	SAFE_DELETE_ARRAY(mThreads);
+}
+
+void CullingThreadpool::WakeThreads()
+{
+	// Wait for all threads to be in suspended mode
+	while (mNumSuspendedThreads < mNumThreads)
+		std::this_thread::yield();
+
+	// Send wake up event
+	std::unique_lock<std::mutex> lock(mSuspendedMutex);
+	mSuspendThreads = false;
+	lock.unlock();
+	mSuspendedCV.notify_all();
+}
+
+void CullingThreadpool::SuspendThreads()
+{
+	// Signal threads to go into suspended mode (after finishing all outstanding work)
+	mSuspendThreads = true;
+}
+
+void CullingThreadpool::Flush()
+{
+	// Wait for pipeline to be empty (i.e. all work is finished)
+	while (!mRenderQueue->IsPipelineEmpty())
+		std::this_thread::yield();
+
+	// Reset queue counters
+	mRenderQueue->Reset();
+}
+
+void CullingThreadpool::SetBuffer(MaskedOcclusionCulling *moc)
+{
+	Flush();
+	mMOC = moc;
+	SetupScissors();
+}
+
+void CullingThreadpool::SetResolution(unsigned int width, unsigned int height)
+{
+	Flush();
+	mMOC->SetResolution(width, height);
+	SetupScissors();
+}
+
+void CullingThreadpool::SetNearClipPlane(float nearDist)
+{
+	Flush();
+	mMOC->SetNearClipPlane(nearDist);
+}
+
+void CullingThreadpool::SetMatrix(const float *modelToClipMatrix)
+{
+	// Treat nullptr matrix as a special case, otherwise copy the contents of the pointer and add to state
+	if (modelToClipMatrix == nullptr)
+		mCurrentMatrix = nullptr;
+	else
+	{
+		mModelToClipMatrices.AddData(Matrix4x4(modelToClipMatrix));
+		mCurrentMatrix = mModelToClipMatrices.GetData()->mValues;
+	}
+}
+
+void CullingThreadpool::SetVertexLayout(const VertexLayout &vtxLayout)
+{
+	mVertexLayouts.AddData(vtxLayout);
+}
+
+void CullingThreadpool::ClearBuffer()
+{
+	Flush();
+	mMOC->ClearBuffer();
+}
+
+void CullingThreadpool::RenderTriangles(const float *inVtx, const unsigned int *inTris, int nTris, BackfaceWinding bfWinding, ClipPlanes clipPlaneMask)
+{
+#if MOC_RECORDER_ENABLE != 0
+    mMOC->RecordRenderTriangles( inVtx, inTris, nTris, mCurrentMatrix, clipPlaneMask, bfWinding, *mVertexLayouts.GetData( ) );
+#endif
+
+    for (int i = 0; i < nTris; i += TRIS_PER_JOB)
+	{
+		// Yield if work queue is full 
+		while (!mRenderQueue->CanWrite())
+			std::this_thread::yield();
+
+		// Create new renderjob
+		RenderJobQueue::Job *job = mRenderQueue->GetWriteJob();
+		job->mBinningJob.mVerts = inVtx;
+		job->mBinningJob.mTris = inTris + i * 3;
+		job->mBinningJob.nTris = nTris - i < TRIS_PER_JOB ? nTris - i : TRIS_PER_JOB;
+		job->mBinningJob.mMatrix = mCurrentMatrix;
+		job->mBinningJob.mClipPlanes = clipPlaneMask;
+		job->mBinningJob.mBfWinding = bfWinding;
+		job->mBinningJob.mVtxLayout = mVertexLayouts.GetData();
+		mRenderQueue->AdvanceWriteJob();
+	}
+}
+
+CullingThreadpool::CullingResult CullingThreadpool::TestRect(float xmin, float ymin, float xmax, float ymax, float wmin)
+{
+	return mMOC->TestRect(xmin, ymin, xmax, ymax, wmin);
+}
+
+CullingThreadpool::CullingResult CullingThreadpool::TestTriangles(const float *inVtx, const unsigned int *inTris, int nTris, BackfaceWinding bfWinding, ClipPlanes clipPlaneMask)
+{
+	return mMOC->TestTriangles(inVtx, inTris, nTris, mCurrentMatrix, bfWinding, clipPlaneMask, *mVertexLayouts.GetData());
+}
+
+void CullingThreadpool::ComputePixelDepthBuffer(float *depthData, bool flipY)
+{
+	Flush();
+	mMOC->ComputePixelDepthBuffer(depthData, flipY);
+}
diff --git a/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/CullingThreadpool.h b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/CullingThreadpool.h
new file mode 100644
index 00000000..887c82b7
--- /dev/null
+++ b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/CullingThreadpool.h
@@ -0,0 +1,309 @@
+////////////////////////////////////////////////////////////////////////////////
+// Copyright 2017 Intel Corporation
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License.  You may obtain a copy
+// of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+// License for the specific language governing permissions and limitations
+// under the License.
+////////////////////////////////////////////////////////////////////////////////
+#pragma once
+
+ /*!
+  * \file CullingThreadpool.h
+  * \brief Worker threadpool example for threaded masked occlusion culling.
+  *
+  * This class implements a threadpool for occluder rendering. Calls to CullingThreadpool::RenderTriangle()
+  * will immediately return, after adding work items to a queue, and occluder rendering is performed
+  * by worker threads as quickly as possible. Occlusion queries are performed directly on the calling 
+  * threadand can be performed either synchronosly, by calling Flush() before executing the query, or 
+  * asynchronosly, by performing the query without waiting for the worker threads to finish. 
+  *
+  * Note that this implementation should be considered an example rather than the best threading
+  * solution. You may want to integrate threading in your own task system, and it may also be beneficial 
+  * to thread the traversal code. Refer to MaskedOcclusionCulling::BinTriangles() and 
+  * MaskedOcclusionCulling::RenderTrilist() for functions that can be used to make your own 
+  * threaded culling system. 
+  */
+
+#include <thread>
+#include <atomic>
+#include <mutex>
+#include <condition_variable>
+
+#include "MaskedOcclusionCulling.h"
+
+class CullingThreadpool
+{
+protected:
+	static const int TRIS_PER_JOB = 1024; // Maximum number of triangles per job (bigger drawcalls are split), affects memory requirements
+
+	typedef MaskedOcclusionCulling::CullingResult   CullingResult;
+	typedef MaskedOcclusionCulling::ClipPlanes      ClipPlanes;
+	typedef MaskedOcclusionCulling::BackfaceWinding BackfaceWinding;
+	typedef MaskedOcclusionCulling::ScissorRect     ScissorRect;
+	typedef MaskedOcclusionCulling::VertexLayout    VertexLayout;
+	typedef MaskedOcclusionCulling::TriList         TriList;
+
+	// Small utility class for 4x4 matrices
+	struct Matrix4x4
+	{
+		float mValues[16];
+		Matrix4x4() {}
+		Matrix4x4(const float *matrix)
+		{
+			for (int i = 0; i < 16; ++i)
+				mValues[i] = matrix[i];
+		}
+	};
+
+	// Internal utility class for a (mostly) lockless queue for binning & rendering jobs
+	struct RenderJobQueue
+	{
+		struct BinningJob
+		{
+			const float*        mVerts;
+			const unsigned int* mTris;
+			unsigned int        nTris;
+
+			const float*        mMatrix;
+			ClipPlanes          mClipPlanes;
+			BackfaceWinding     mBfWinding;
+			const VertexLayout* mVtxLayout;
+		};
+
+		struct Job
+		{
+			volatile unsigned int mBinningJobStartedIdx;
+			volatile unsigned int mBinningJobCompletedIdx;
+			BinningJob            mBinningJob;
+			TriList               *mRenderJobs;
+		};
+
+		unsigned int          mNumBins;
+		unsigned int          mMaxJobs;
+
+		volatile unsigned int mWritePtr;
+		std::atomic_uint      mBinningPtr;
+		std::atomic_uint      *mRenderPtrs;
+		std::atomic_uint      *mBinMutexes;
+
+		float                 *mTrilistData;
+		Job                   *mJobs;
+
+		RenderJobQueue(unsigned int nBins, unsigned int maxJobs);
+		~RenderJobQueue();
+
+		unsigned int GetMinRenderPtr() const;
+		unsigned int GetBestGlobalQueue() const;
+		bool IsPipelineEmpty() const;
+
+		bool CanWrite() const;
+		bool CanBin() const;
+
+		Job *GetWriteJob();
+		void AdvanceWriteJob();
+
+		Job *GetBinningJob();
+		void FinishedBinningJob(Job *job);
+
+		Job *GetRenderJob(int binIdx);
+		void AdvanceRenderJob(int binIdx);
+
+		void Reset();
+	};
+
+	// Internal utility class for state (matrix / vertex layout)
+	template<class T> struct StateData
+	{
+		unsigned int mMaxJobs;
+		unsigned int mCurrentIdx;
+		T            *mData;
+
+		StateData(unsigned int maxJobs);
+		~StateData();
+		void AddData(const T &data);
+		const T *GetData() const;
+	};
+
+	// Number of worker threads and bins
+	unsigned int            mNumThreads;
+	unsigned int            mNumBins;
+	unsigned int            mMaxJobs;
+	unsigned int            mBinsW;
+	unsigned int            mBinsH;
+
+	// Threads and control variables
+	std::mutex              mSuspendedMutex;
+	std::condition_variable mSuspendedCV;
+	volatile bool           mKillThreads;
+	volatile bool           mSuspendThreads;
+	volatile unsigned int   mNumSuspendedThreads;
+	std::thread             *mThreads;
+
+	// State variables and command queue
+	const float             *mCurrentMatrix;
+	StateData<Matrix4x4>    mModelToClipMatrices;
+	StateData<VertexLayout> mVertexLayouts;
+	RenderJobQueue          *mRenderQueue;
+
+	// Occlusion culling object and related scissor rectangles
+	ScissorRect             *mRects;
+	MaskedOcclusionCulling  *mMOC;
+
+	void SetupScissors();
+
+	static void ThreadRun(CullingThreadpool *threadPool, unsigned int threadId);
+	void ThreadMain(unsigned int threadIdx);
+
+public:
+	/*!
+	 * \brief Creates a new threadpool for masked occlusion culling. This object has a 
+	 *        similar API to the MaskedOcclusionCulling class, but performs occluder
+	 *        rendering asynchronously on worker threads (similar to how DX/GL works). 
+	 *
+	 * \param numThreads Number of worker threads to perform occluder rendering. Best 
+	 *        balance may be scene/machine dependent, but it's good practice to leave at 
+	 *        least one full core (2 threads with hyperthreading) for the main thread.
+	 * \param binsW The screen is divided into binsW x binsH rectangular bins for load
+	 *        balancing. The number of bins should be atleast equal to the number of
+	 *        worker threads.
+	 * \param binsH See description for the binsW parameter.
+	 * \param maxJobs Maximum number of jobs that may be in flight at any given time. If
+	 *        the caller thread generates jobs faster than the worker threads can finish
+	 *        them, then the job queue will fill up and the caller thread will stall once
+	 *        "maxJobs" items have been queued up. For culling systems interleaving occlusion 
+	 *        queries and rendering, this value should be kept quite low to minimize false
+	 *        positives (see TestRect()). We've observed that 32 [default] items typically
+	 *        works well for our interleaved queries, while also allowing good load-balancing,
+	 *        and this is the recommended setting. 
+	 */
+	CullingThreadpool(unsigned int numThreads, unsigned int binsW, unsigned int binsH, unsigned int maxJobs = 32);
+	
+	/*!
+	 * \brief Destroys the threadpool and terminates all worker threads.
+	 */
+	~CullingThreadpool();
+
+	/*!
+	 * \brief Wakes up culling worker threads from suspended sleep, and puts them in a
+	 *        ready state (using an idle spinlock with significantly higher CPU overhead). 
+	 *
+	 * It may take on the order of 100us to wake up the threads, so this function should
+	 * preferably be called slightly ahead of starting occlusion culling work.
+	 */
+	void WakeThreads();
+
+	/*!
+	 * \brief Suspend all culling worker threads to a low CPU overhead sleep state. 
+	 *
+	 * For performance and latency reasons, the culling work is performed in an active 
+	 * processing loop (with no thread sleeping) with high CPU overhead. In a system 
+	 * with more worker threads it's important to put the culling worker threads in a 
+	 * low overhead sleep state after occlusion culling work has completed.
+	 */
+	void SuspendThreads();
+
+	/*!
+	 * \brief Waits for all outstanding occluder rendering work to complete. Can be used
+	 *        to ensure that rendering has completed before performing a TestRect() or 
+	 *        TestTriangles() call.
+	 */
+	void Flush();
+
+	/*
+	 * \brief Sets the MaskedOcclusionCulling object (buffer) to be used for rendering and
+	 *        testing calls. This method causes a Flush() to ensure that all unfinished 
+	 *        rendering is completed.
+	 */
+	void SetBuffer(MaskedOcclusionCulling *moc);
+
+	/*
+	 * \brief Changes the resolution of the occlusion buffer, see MaskedOcclusionCulling::SetResolution().
+	 *        This method causes a Flush() to ensure that all unfinished rendering is completed.
+	 */
+	void SetResolution(unsigned int width, unsigned int height);
+
+	/*
+	 * \brief Sets the near clipping plane, see MaskedOcclusionCulling::SetNearClipPlane(). This 
+	 *        method causes a Flush() to ensure that all unfinished rendering is completed.
+	 */
+	void SetNearClipPlane(float nearDist);
+
+	/*
+	 * \brief Sets the model to clipspace transform matrix used for the RenderTriangles() and TestTriangles() 
+	 *        function calls. The contents of the matrix is copied, and it's safe to modify it without calling
+	 *        Flush(). The copy may be costly, which is the reason for passing this parameter as "state".
+	 *
+	 * \param modelToClipMatrix All vertices will be transformed by the specified model to clipspace matrix. 
+	 *        Passing nullptr [default] disables the transform (equivalent to using an identity matrix).
+	 */
+	void SetMatrix(const float *modelToClipMatrix = nullptr);
+
+	/*
+	 * \brief Sets the vertex layout used for the RenderTriangles() and TestTriangles() function calls.
+	 *        The vertex layout is copied, and it's safe to modify it without calling Flush(). The copy 
+	 *        may be costly, which is the reason for passing this parameter as "state".
+	 *
+	 * \param vtxLayout A struct specifying the vertex layout (see struct for detailed
+	 *        description). For best performance, it is advicable to store position data
+	 *        as compactly in memory as possible.
+	 */
+	void SetVertexLayout(const VertexLayout &vtxLayout = VertexLayout(16, 4, 12));
+
+	/*
+	 * \brief Clears the occlusion buffer, see MaskedOcclusionCulling::ClearBuffer(). This method
+	 *        causes a Flush() to ensure that all unfinished rendering is completed.
+	 */
+	void ClearBuffer();
+
+	/*
+	 * \brief Asynchronously render occluder triangles, see MaskedOcclusionCulling::RenderTriangles().
+	 *
+	 * This method puts the drawcall into a command queue, and immediately returns. The rendering is 
+	 * performed by the worker threads at the earliest opportunity.
+	 *
+	 * <B>Important:</B> As rendering is performed asynchronously, the application is not allowed to 
+	 * change the contents of the *inVtx or *inTris buffers until after rendering is completed. If 
+	 * you wish to use dynamic buffers, the application must perform a Flush() to ensure that rendering 
+	 * is finished, or make sure to rotate between more buffers than the maximum number of outstanding
+	 * render jobs (see the CullingThreadpool() constructor).
+	 */
+	void RenderTriangles(const float *inVtx, const unsigned int *inTris, int nTris, BackfaceWinding bfWinding = MaskedOcclusionCulling::BACKFACE_CW, ClipPlanes clipPlaneMask = MaskedOcclusionCulling::CLIP_PLANE_ALL);
+
+	/*
+	 * \brief Occlusion query for a rectangle with a given depth, see MaskedOcclusionCulling::TestRect().
+	 *
+	 * <B>Important:</B> This method is performed on the main thread and does not wait for outstanding 
+	 * occluder rendering to be finished. To ensure that all occluder rendering is completed you must 
+	 * perform a Flush() prior to calling this function. 
+	 *
+	 * It is conservatively correct to perform occlusion queries without calling Flush() (it may only 
+	 * lead to objects being incorrectly classified as visible), and it can lead to much better performance 
+	 * if occlusion queries are used for traversing a BVH or similar data structure. It's possible to 
+	 * use "asynchronous" queries during traversal, and removing false positives later, when rendering 
+	 * has completed.
+	 */
+	CullingResult TestRect(float xmin, float ymin, float xmax, float ymax, float wmin);
+
+	/*
+	 * \brief Occlusion query for a mesh, see MaskedOcclusionCulling::TestTriangles().
+	 *
+	 * <B>Important:</B> See the TestRect() method for a brief discussion about asynchronous occlusion 
+	 * queries.
+	 */
+	CullingResult TestTriangles(const float *inVtx, const unsigned int *inTris, int nTris, BackfaceWinding bfWinding = MaskedOcclusionCulling::BACKFACE_CW, ClipPlanes clipPlaneMask = MaskedOcclusionCulling::CLIP_PLANE_ALL);
+
+	/*!
+	 * \brief Creates a per-pixel depth buffer from the hierarchical z buffer representation, see
+	 *        MaskedOcclusionCulling::ComputePixelDepthBuffer(). This method causes a Flush() to 
+	 *        ensure that all unfinished rendering is completed.
+	 */
+	void ComputePixelDepthBuffer(float *depthData, bool flipY);
+};
diff --git a/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/D3DValidate/D3DValidate.cpp b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/D3DValidate/D3DValidate.cpp
new file mode 100644
index 00000000..e6d881a5
--- /dev/null
+++ b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/D3DValidate/D3DValidate.cpp
@@ -0,0 +1,471 @@
+////////////////////////////////////////////////////////////////////////////////
+// Copyright 2017 Intel Corporation
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License.  You may obtain a copy
+// of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+// License for the specific language governing permissions and limitations
+// under the License.
+////////////////////////////////////////////////////////////////////////////////
+#include <float.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <intrin.h>
+#include <math.h>
+#include <algorithm>
+#include <random>
+
+#include "../MaskedOcclusionCulling.h"
+#include "../CullingThreadpool.h"
+
+std::mt19937 gRnd;
+std::uniform_real_distribution<float> gRndUniform(0, 1);
+
+////////////////////////////////////////////////////////////////////////////////////////
+// DX 11 functions
+////////////////////////////////////////////////////////////////////////////////////////
+
+#define NOMINMAX
+#include <windows.h>
+#include <d3d11.h>
+#include <d3dcompiler.h>
+
+#pragma comment (lib, "d3d11.lib")
+#pragma comment (lib, "d3dcompiler.lib")
+
+ID3D11Texture2D				*textureZ;
+ID3D11Texture2D				*textureCol, *staging;
+ID3D11DepthStencilView		*textureDSV;
+ID3D11RenderTargetView		*textureRTV;
+ID3D11Device				*device;
+ID3D11DeviceContext			*context;
+
+ID3D11RasterizerState		*rastState;
+ID3D11DepthStencilState		*DSState;
+ID3D11InputLayout			*layout;
+ID3D11VertexShader			*VS;
+ID3D11PixelShader			*PS;
+std::vector<ID3D11Buffer*>	vBuffers;
+ID3D11Query					*endQuery;
+
+#define D3DVERIFY(X) if (X != S_OK) exit(1);
+
+void InitD3D(unsigned int width, unsigned int height, D3D_DRIVER_TYPE DriverType = D3D_DRIVER_TYPE_HARDWARE)
+{
+	const char *shader =
+		"float4 VShader(float4 position : POSITION) : SV_POSITION { return position; }"
+		"float4 PShader(float4 position : SV_POSITION) : SV_TARGET { return 1.0f - position.z; }";
+
+	D3D_FEATURE_LEVEL fLevel;
+	D3DVERIFY(D3D11CreateDevice(nullptr, DriverType, nullptr, 0, nullptr, 0, D3D11_SDK_VERSION, &device, &fLevel, &context));
+
+	D3D11_TEXTURE2D_DESC tDesc;
+	tDesc.Width = width;
+	tDesc.Height = height;
+	tDesc.MipLevels = tDesc.ArraySize = 1;
+	tDesc.SampleDesc.Count = 1;
+	tDesc.SampleDesc.Quality = 0;
+	tDesc.CPUAccessFlags = 0;
+	tDesc.MiscFlags = 0;
+	tDesc.Usage = D3D11_USAGE_DEFAULT;
+
+	tDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
+	tDesc.BindFlags = D3D11_BIND_RENDER_TARGET;
+	D3DVERIFY(device->CreateTexture2D(&tDesc, nullptr, &textureCol));
+
+	tDesc.Format = DXGI_FORMAT_D24_UNORM_S8_UINT;
+	tDesc.BindFlags = D3D11_BIND_DEPTH_STENCIL;
+	D3DVERIFY(device->CreateTexture2D(&tDesc, nullptr, &textureZ));
+
+	tDesc.Usage = D3D11_USAGE_STAGING;
+	tDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
+	tDesc.BindFlags = 0;
+	tDesc.CPUAccessFlags = D3D11_CPU_ACCESS_READ;
+	D3DVERIFY(device->CreateTexture2D(&tDesc, nullptr, &staging));
+
+	D3D11_DEPTH_STENCIL_VIEW_DESC dsvDesc;
+	dsvDesc.Flags = 0;
+	dsvDesc.Format = DXGI_FORMAT_D24_UNORM_S8_UINT;
+	dsvDesc.ViewDimension = D3D11_DSV_DIMENSION_TEXTURE2D;
+	dsvDesc.Texture2D.MipSlice = 0;
+	D3DVERIFY(device->CreateDepthStencilView(textureZ, &dsvDesc, &textureDSV));
+
+	D3D11_RENDER_TARGET_VIEW_DESC rtvDesc;
+	rtvDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
+	rtvDesc.ViewDimension = D3D11_RTV_DIMENSION_TEXTURE2D;
+	rtvDesc.Texture2D.MipSlice = 0;
+	D3DVERIFY(device->CreateRenderTargetView(textureCol, &rtvDesc, &textureRTV));
+
+	// Set the viewport
+	D3D11_VIEWPORT viewport;
+	viewport.TopLeftX = 0;
+	viewport.TopLeftY = 0;
+	viewport.Width = (float)width;
+	viewport.Height = (float)height;
+	viewport.MinDepth = 0;
+	viewport.MaxDepth = 1;
+	context->RSSetViewports(1, &viewport);
+
+	// load and compile the two shaders
+	ID3D10Blob *VSBlob, *PSBlob;
+	D3DVERIFY(D3DCompile(shader, strlen(shader), "shader", nullptr, nullptr, "VShader", "vs_5_0", 0, 0, &VSBlob, nullptr));
+	D3DVERIFY(D3DCompile(shader, strlen(shader), "shader", nullptr, nullptr, "PShader", "ps_5_0", 0, 0, &PSBlob, nullptr));
+
+	// encapsulate both shaders into shader objects
+	D3DVERIFY(device->CreateVertexShader(VSBlob->GetBufferPointer(), VSBlob->GetBufferSize(), NULL, &VS));
+	D3DVERIFY(device->CreatePixelShader(PSBlob->GetBufferPointer(), PSBlob->GetBufferSize(), NULL, &PS));
+
+	// set the shader objects
+	context->VSSetShader(VS, 0, 0);
+	context->PSSetShader(PS, 0, 0);
+
+	// create the input layout object
+	D3D11_INPUT_ELEMENT_DESC ied[] =
+	{
+		{ "POSITION", 0, DXGI_FORMAT_R32G32B32A32_FLOAT, 0, 0, D3D11_INPUT_PER_VERTEX_DATA, 0 },
+	};
+
+	D3DVERIFY(device->CreateInputLayout(ied, 1, VSBlob->GetBufferPointer(), VSBlob->GetBufferSize(), &layout));
+	context->IASetInputLayout(layout);
+
+	D3D11_RASTERIZER_DESC rDesc;
+	rDesc.FillMode = D3D11_FILL_SOLID;
+	rDesc.CullMode = D3D11_CULL_NONE;
+	rDesc.FrontCounterClockwise = false;
+	rDesc.DepthBias = 0;
+	rDesc.DepthBiasClamp = 0;
+	rDesc.SlopeScaledDepthBias = 0;
+	rDesc.DepthClipEnable = false;
+	rDesc.ScissorEnable = false;
+	rDesc.MultisampleEnable = false;
+	rDesc.AntialiasedLineEnable = false;
+	device->CreateRasterizerState(&rDesc, &rastState);
+	context->RSSetState(rastState);
+
+	D3D11_DEPTH_STENCIL_DESC dsDesc;
+	ZeroMemory(&dsDesc, sizeof(D3D11_DEPTH_STENCIL_DESC));
+	dsDesc.DepthEnable = true;
+	dsDesc.StencilEnable = false;
+	dsDesc.DepthFunc = D3D11_COMPARISON_LESS_EQUAL;
+	dsDesc.DepthWriteMask = D3D11_DEPTH_WRITE_MASK_ALL;
+	device->CreateDepthStencilState(&dsDesc, &DSState);
+	context->OMSetDepthStencilState(DSState, 0);
+
+	D3D11_QUERY_DESC qDesc;
+	qDesc.Query = D3D11_QUERY_EVENT;
+	qDesc.MiscFlags = 0;
+	D3DVERIFY(device->CreateQuery(&qDesc, &endQuery));
+}
+
+bool D3DValidateTriangle(float *verts, MaskedOcclusionCulling *moc)
+{
+	unsigned int width, height;
+	moc->GetResolution(width, height);
+
+	////////////////////////////////////////////////////////////////////////////////////////
+	// Draw triangle using our framework and read back depth buffer
+	////////////////////////////////////////////////////////////////////////////////////////
+
+	// Draw triangle using our framework
+	unsigned int indices[3] = { 0,1,2 };
+	moc->ClearBuffer();
+	moc->RenderTriangles(verts, indices, 1);
+
+	// Read back result
+	float *depthBuffer = new float[width*height];
+	moc->ComputePixelDepthBuffer(depthBuffer, false);
+
+	////////////////////////////////////////////////////////////////////////////////////////
+	// Draw triangle using DirectX 11 and read back color image
+	////////////////////////////////////////////////////////////////////////////////////////
+
+	// Create D3D buffer
+	ID3D11Buffer *buf = nullptr;
+
+	D3D11_SUBRESOURCE_DATA iData;
+	iData.pSysMem = verts;
+	iData.SysMemPitch = 0;
+	iData.SysMemSlicePitch = 0;
+
+	D3D11_BUFFER_DESC bDesc;
+	bDesc.Usage = D3D11_USAGE_DEFAULT;
+	bDesc.ByteWidth = 3 * 4 * sizeof(float);
+	bDesc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
+	bDesc.CPUAccessFlags = bDesc.MiscFlags = bDesc.StructureByteStride = 0;
+	D3DVERIFY(device->CreateBuffer(&bDesc, &iData, &buf));
+
+	// Clear renderbuffers
+	float clearColor[4] = { 0.0f, 0.0f, 0.0f, 1.0f };
+	context->OMSetRenderTargets(1, &textureRTV, textureDSV);
+	context->ClearRenderTargetView(textureRTV, clearColor);
+	context->ClearDepthStencilView(textureDSV, D3D11_CLEAR_DEPTH, 1.0f, 0);
+
+	// Draw triangle using D3D
+	UINT stride = sizeof(float) * 4, offset = 0;
+	context->IASetVertexBuffers(0, 1, &buf, &stride, &offset);
+	context->IASetPrimitiveTopology(D3D10_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
+	context->Draw(3, 0);
+
+	buf->Release();
+
+	// Read back resulting D3D image 
+	unsigned char *d3dimg = new unsigned char[width * height * 4];
+	D3D11_MAPPED_SUBRESOURCE map;
+	context->CopyResource(staging, textureCol);
+	context->Map(staging, 0, D3D11_MAP_READ, 0, &map);
+	memcpy(d3dimg, map.pData, width*height * 4);
+	context->Unmap(staging, 0);
+
+	////////////////////////////////////////////////////////////////////////////////////////
+	// Compare rasterized coverage
+	////////////////////////////////////////////////////////////////////////////////////////
+
+	bool identical = true;
+	for (unsigned int y = 0; y < height; ++y)
+	{
+		for (unsigned int x = 0; x < width; ++x)
+		{
+			bool d3dcov = (d3dimg[(x + y*width) * 4] + d3dimg[(x + y*width) * 4 + 1] + d3dimg[(x + y*width) * 4 + 2]) != 0;
+			bool ourcov = depthBuffer[x + y*width] != -1.0f;
+
+			if (d3dcov != ourcov)
+				identical = false;
+		}
+	}
+
+	delete[] depthBuffer;
+	delete[] d3dimg;
+
+	return identical;
+}
+
+bool D3DValidateTriangleThreaded(float *verts, unsigned int width, unsigned int height, CullingThreadpool *ctp)
+{
+
+	////////////////////////////////////////////////////////////////////////////////////////
+	// Draw triangle using our framework and read back depth buffer
+	////////////////////////////////////////////////////////////////////////////////////////
+
+	// Draw triangle using our framework
+	unsigned int indices[3] = { 0,1,2 };
+	ctp->ClearBuffer();
+	ctp->RenderTriangles(verts, indices, 1);
+	ctp->Flush();
+
+
+	// Read back result
+	float *depthBuffer = new float[width*height];
+	ctp->ComputePixelDepthBuffer(depthBuffer, false);
+
+	////////////////////////////////////////////////////////////////////////////////////////
+	// Draw triangle using DirectX 11 and read back color image
+	////////////////////////////////////////////////////////////////////////////////////////
+
+	// Create D3D buffer
+	ID3D11Buffer *buf = nullptr;
+
+	D3D11_SUBRESOURCE_DATA iData;
+	iData.pSysMem = verts;
+	iData.SysMemPitch = 0;
+	iData.SysMemSlicePitch = 0;
+
+	D3D11_BUFFER_DESC bDesc;
+	bDesc.Usage = D3D11_USAGE_DEFAULT;
+	bDesc.ByteWidth = 3 * 4 * sizeof(float);
+	bDesc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
+	bDesc.CPUAccessFlags = bDesc.MiscFlags = bDesc.StructureByteStride = 0;
+	D3DVERIFY(device->CreateBuffer(&bDesc, &iData, &buf));
+
+	// Clear renderbuffers
+	float clearColor[4] = { 0.0f, 0.0f, 0.0f, 1.0f };
+	context->OMSetRenderTargets(1, &textureRTV, textureDSV);
+	context->ClearRenderTargetView(textureRTV, clearColor);
+	context->ClearDepthStencilView(textureDSV, D3D11_CLEAR_DEPTH, 1.0f, 0);
+
+	// Draw triangle using D3D
+	UINT stride = sizeof(float) * 4, offset = 0;
+	context->IASetVertexBuffers(0, 1, &buf, &stride, &offset);
+	context->IASetPrimitiveTopology(D3D10_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
+	context->Draw(3, 0);
+
+	buf->Release();
+
+	// Read back resulting D3D image 
+	unsigned char *d3dimg = new unsigned char[width * height * 4];
+	D3D11_MAPPED_SUBRESOURCE map;
+	context->CopyResource(staging, textureCol);
+	context->Map(staging, 0, D3D11_MAP_READ, 0, &map);
+	memcpy(d3dimg, map.pData, width*height * 4);
+	context->Unmap(staging, 0);
+
+	////////////////////////////////////////////////////////////////////////////////////////
+	// Compare rasterized coverage
+	////////////////////////////////////////////////////////////////////////////////////////
+
+	bool identical = true;
+	for (unsigned int y = 0; y < height; ++y)
+	{
+		for (unsigned int x = 0; x < width; ++x)
+		{
+			bool d3dcov = (d3dimg[(x + y*width) * 4] + d3dimg[(x + y*width) * 4 + 1] + d3dimg[(x + y*width) * 4 + 2]) != 0;
+			bool ourcov = depthBuffer[x + y*width] != -1.0f;
+
+			if (d3dcov != ourcov)
+				identical = false;
+		}
+	}
+
+	delete[] depthBuffer;
+	delete[] d3dimg;
+
+	return identical;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////
+// Random triangle generator
+////////////////////////////////////////////////////////////////////////////////////////
+
+void RandomTriangle(float *verts)
+{
+	float xprod = -1;
+	while (xprod < 0.0f)
+	{
+		for (unsigned int i = 0; i < 3; ++i)
+		{
+			verts[i * 4 + 0] = gRndUniform(gRnd) * 2.0f - 1.0f;
+			verts[i * 4 + 1] = gRndUniform(gRnd) * 2.0f - 1.0f;
+			verts[i * 4 + 2] = 0.0f;
+			verts[i * 4 + 3] = 1.0f;
+		}
+
+		// Test if triangle is front facing (ccw winded)
+		float v0x = verts[4] - verts[0];
+		float v0y = verts[5] - verts[1];
+		float v1x = verts[8] - verts[0];
+		float v1y = verts[9] - verts[1];
+		xprod = (v0x * v1y) - (v0y * v1x);
+	}
+}
+
+
+////////////////////////////////////////////////////////////////////////////////////////
+// Simple Command Line parser
+////////////////////////////////////////////////////////////////////////////////////////
+
+char* getCmdOption(char ** begin, char ** end, const std::string & option)
+{
+	char ** itr = std::find(begin, end, option);
+	if (itr != end && ++itr != end)
+	{
+		return *itr;
+	}
+	return 0;
+}
+
+bool cmdOptionExists(char** begin, char** end, const std::string& option)
+{
+	return std::find(begin, end, option) != end;
+}
+////////////////////////////////////////////////////////////////////////////////////////
+// Main: Validate a large number of randomized triangles
+////////////////////////////////////////////////////////////////////////////////////////
+
+int main(int argc, char* argv[])
+{
+	const int width = 2048, height = 2048;
+
+	// Flush denorms to zero to avoid performance issues with small values
+	_mm_setcsr(_mm_getcsr() | 0x8040);
+
+	if (cmdOptionExists(argv, argv + argc, "-h"))
+	{
+		printf("-Help\n");
+		printf("ValidateTest [-a <WARP> <REF>]\n");
+		exit(0);
+	}
+
+	char * pOptions = getCmdOption(argv, argv + argc, "-a");
+
+	// Initialize directx
+	if (pOptions)
+	{
+		if (!strncmp(pOptions, "WARP", strlen(pOptions)))
+		{
+			printf("Testing against WARP\n");
+			InitD3D(width, height, D3D_DRIVER_TYPE_WARP);
+		}
+
+		if (!strncmp(pOptions, "REF", strlen(pOptions)))
+		{
+			printf("Testing against REF\n");
+			InitD3D(width, height, D3D_DRIVER_TYPE_REFERENCE);
+		}
+
+	}
+	else
+	{
+		printf("Testing against Hardware\n");
+		InitD3D(width, height);
+	}
+
+
+	MaskedOcclusionCulling *moc = MaskedOcclusionCulling::Create();
+
+	////////////////////////////////////////////////////////////////////////////////////////
+	// Setup and state related code
+	////////////////////////////////////////////////////////////////////////////////////////
+
+
+	// Setup a rendertarget with near clip plane at w = 1.0
+	moc->SetResolution(width, height);
+	moc->SetNearClipPlane(1.0f);
+
+	float verts[3*4];
+	static const int nTriangles = 1000;
+	int nPassed = 0;
+	for (int i = 0; i < nTriangles; ++i)
+	{
+		RandomTriangle(verts);
+		bool pass = D3DValidateTriangle(verts, moc);
+		if (pass)
+			nPassed++;
+		else
+			printf("Testing triangle %d... FAILED\n", i);
+
+		if (i % 100 == 0)
+			printf("Testing triangle %d\n", i);
+	}
+	printf("%d / %d triangles passed\n", nPassed, nTriangles);
+
+	int numThreads = std::thread::hardware_concurrency() - 1;
+	printf("\n\nTesting Masked multi threaded code path (using binning), %d threads\n", numThreads);
+	printf("----\n");
+	CullingThreadpool ctp(numThreads, 2, numThreads);
+	ctp.SetBuffer(moc);
+	ctp.WakeThreads();
+
+	unsigned int mocwidth, mocheight;
+	moc->GetResolution(mocwidth, mocheight);
+	// Rest Pass rate
+	nPassed = 0;
+	for (int i = 0; i < nTriangles; ++i)
+	{
+		RandomTriangle(verts);
+		bool pass = D3DValidateTriangleThreaded(verts, mocwidth, mocheight, &ctp);
+		if (pass)
+			nPassed++;
+		else
+			printf("Testing triangle %d... FAILED\n", i);
+
+		if (i % 100 == 0)
+			printf("Testing triangle %d\n", i);
+	}
+	printf("%d / %d triangles passed\n", nPassed, nTriangles);
+	ctp.SuspendThreads();
+}
diff --git a/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/D3DValidate/D3DValidate.vcxproj.filters b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/D3DValidate/D3DValidate.vcxproj.filters
new file mode 100644
index 00000000..a7f52b9e
--- /dev/null
+++ b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/D3DValidate/D3DValidate.vcxproj.filters
@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <ClCompile Include="D3DValidate.cpp" />
+    <ClCompile Include="..\CullingThreadpool.cpp">
+      <Filter>MaskedOcclusionCullingLibrary</Filter>
+    </ClCompile>
+    <ClCompile Include="..\MaskedOcclusionCulling.cpp">
+      <Filter>MaskedOcclusionCullingLibrary</Filter>
+    </ClCompile>
+    <ClCompile Include="..\MaskedOcclusionCullingAVX2.cpp">
+      <Filter>MaskedOcclusionCullingLibrary</Filter>
+    </ClCompile>
+    <ClCompile Include="..\MaskedOcclusionCullingAVX512.cpp">
+      <Filter>MaskedOcclusionCullingLibrary</Filter>
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="..\CullingThreadpool.h">
+      <Filter>MaskedOcclusionCullingLibrary</Filter>
+    </ClInclude>
+    <ClInclude Include="..\MaskedOcclusionCulling.h">
+      <Filter>MaskedOcclusionCullingLibrary</Filter>
+    </ClInclude>
+  </ItemGroup>
+  <ItemGroup>
+    <Filter Include="MaskedOcclusionCullingLibrary">
+      <UniqueIdentifier>{d8c0b3c7-550e-44c2-ac12-708a4d072746}</UniqueIdentifier>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="..\MaskedOcclusionCullingCommon.inl">
+      <Filter>MaskedOcclusionCullingLibrary</Filter>
+    </None>
+    <None Include="..\CompilerSpecific.inl">
+      <Filter>MaskedOcclusionCullingLibrary</Filter>
+    </None>
+  </ItemGroup>
+</Project>
\ No newline at end of file
diff --git a/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/Example/Example.vcxproj.filters b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/Example/Example.vcxproj.filters
new file mode 100644
index 00000000..ca949429
--- /dev/null
+++ b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/Example/Example.vcxproj.filters
@@ -0,0 +1,39 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <ClCompile Include="ExampleMain.cpp" />
+    <ClCompile Include="..\CullingThreadpool.cpp">
+      <Filter>MaskedOcclusionCullingLibrary</Filter>
+    </ClCompile>
+    <ClCompile Include="..\MaskedOcclusionCulling.cpp">
+      <Filter>MaskedOcclusionCullingLibrary</Filter>
+    </ClCompile>
+    <ClCompile Include="..\MaskedOcclusionCullingAVX2.cpp">
+      <Filter>MaskedOcclusionCullingLibrary</Filter>
+    </ClCompile>
+    <ClCompile Include="..\MaskedOcclusionCullingAVX512.cpp">
+      <Filter>MaskedOcclusionCullingLibrary</Filter>
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="..\CullingThreadpool.h">
+      <Filter>MaskedOcclusionCullingLibrary</Filter>
+    </ClInclude>
+    <ClInclude Include="..\MaskedOcclusionCulling.h">
+      <Filter>MaskedOcclusionCullingLibrary</Filter>
+    </ClInclude>
+  </ItemGroup>
+  <ItemGroup>
+    <Filter Include="MaskedOcclusionCullingLibrary">
+      <UniqueIdentifier>{e1b85872-c29a-4dd3-b9db-e4ff2dedded9}</UniqueIdentifier>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="..\MaskedOcclusionCullingCommon.inl">
+      <Filter>MaskedOcclusionCullingLibrary</Filter>
+    </None>
+    <None Include="..\CompilerSpecific.inl">
+      <Filter>MaskedOcclusionCullingLibrary</Filter>
+    </None>
+  </ItemGroup>
+</Project>
\ No newline at end of file
diff --git a/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/Example/ExampleMain.cpp b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/Example/ExampleMain.cpp
new file mode 100644
index 00000000..6c164512
--- /dev/null
+++ b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/Example/ExampleMain.cpp
@@ -0,0 +1,198 @@
+////////////////////////////////////////////////////////////////////////////////
+// Copyright 2017 Intel Corporation
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License.  You may obtain a copy
+// of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+// License for the specific language governing permissions and limitations
+// under the License.
+////////////////////////////////////////////////////////////////////////////////
+#ifndef _CRT_SECURE_NO_WARNINGS
+	#define _CRT_SECURE_NO_WARNINGS
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <float.h>
+#include <algorithm>
+#ifdef _WIN32
+	#include <intrin.h>
+#else
+	#include <immintrin.h>
+#endif
+
+#include "../MaskedOcclusionCulling.h"
+
+////////////////////////////////////////////////////////////////////////////////////////
+// Image utility functions, minimal BMP writer and depth buffer tone mapping
+////////////////////////////////////////////////////////////////////////////////////////
+
+static void WriteBMP(const char *filename, const unsigned char *data, int w, int h)
+{
+	short header[] = { 0x4D42, 0, 0, 0, 0, 26, 0, 12, 0, (short)w, (short)h, 1, 24 };
+	FILE *f = fopen(filename, "wb");
+	fwrite(header, 1, sizeof(header), f);
+#if USE_D3D == 1
+	// Flip image because Y axis of Direct3D points in the opposite direction of bmp. If the library 
+	// is configured for OpenGL (USE_D3D 0) then the Y axes would match and this wouldn't be required.
+	for (int y = 0; y < h; ++y)
+		fwrite(&data[(h - y - 1) * w * 3], 1, w * 3, f);
+#else
+	fwrite(data, 1, w * h * 3, f);
+#endif
+	fclose(f);
+}
+
+static void TonemapDepth(float *depth, unsigned char *image, int w, int h)
+{
+	// Find min/max w coordinate (discard cleared pixels)
+	float minW = FLT_MAX, maxW = 0.0f;
+	for (int i = 0; i < w*h; ++i)
+	{
+		if (depth[i] > 0.0f)
+		{
+			minW = std::min(minW, depth[i]);
+			maxW = std::max(maxW, depth[i]);
+		}
+	}
+
+	// Tonemap depth values
+	for (int i = 0; i < w*h; ++i)
+	{
+		int intensity = 0;
+		if (depth[i] > 0)
+			intensity = (unsigned char)(223.0*(depth[i] - minW) / (maxW - minW) + 32.0);
+			
+		image[i * 3 + 0] = intensity;
+		image[i * 3 + 1] = intensity;
+		image[i * 3 + 2] = intensity;
+	}
+}
+
+////////////////////////////////////////////////////////////////////////////////////////
+// Tutorial example code
+////////////////////////////////////////////////////////////////////////////////////////
+
+int main(int argc, char* argv[])
+{
+	// Flush denorms to zero to avoid performance issues with small values
+	_mm_setcsr(_mm_getcsr() | 0x8040);
+
+	MaskedOcclusionCulling *moc = MaskedOcclusionCulling::Create();
+
+	////////////////////////////////////////////////////////////////////////////////////////
+	// Print which version (instruction set) is being used
+	////////////////////////////////////////////////////////////////////////////////////////
+
+	MaskedOcclusionCulling::Implementation implementation = moc->GetImplementation();
+	switch (implementation) {
+	case MaskedOcclusionCulling::SSE2: printf("Using SSE2 version\n"); break;
+	case MaskedOcclusionCulling::SSE41: printf("Using SSE41 version\n"); break;
+	case MaskedOcclusionCulling::AVX2: printf("Using AVX2 version\n"); break;
+	case MaskedOcclusionCulling::AVX512: printf("Using AVX-512 version\n"); break;
+	}
+
+	////////////////////////////////////////////////////////////////////////////////////////
+	// Setup and state related code
+	////////////////////////////////////////////////////////////////////////////////////////
+
+	// Setup a 1920 x 1080 rendertarget with near clip plane at w = 1.0
+	const int width = 1920, height = 1080;
+	moc->SetResolution(width, height);
+	moc->SetNearClipPlane(1.0f);
+
+	// Clear the depth buffer
+	moc->ClearBuffer();
+
+	////////////////////////////////////////////////////////////////////////////////////////
+	// Render some occluders
+	////////////////////////////////////////////////////////////////////////////////////////
+	struct ClipspaceVertex { float x, y, z, w; };
+
+	// A triangle that intersects the view frustum
+	ClipspaceVertex triVerts[] = { { 5, 0, 0, 10 }, { 30, 0, 0, 20 }, { 10, 50, 0, 40 } };
+	unsigned int triIndices[] = { 0, 1, 2 };
+
+	// Render the triangle
+	moc->RenderTriangles((float*)triVerts, triIndices, 1);
+
+	// A clockwise winded (backfacing) triangle
+	ClipspaceVertex cwTriVerts[] = { { 7, -7, 0, 20 },{ 7.5, -7, 0, 20 },{ 7, -7.5, 0, 20 } };
+	unsigned int cwTriIndices[] = { 0, 1, 2 };
+
+	// Render with counter-clockwise backface culling, the triangle is rendered
+	moc->RenderTriangles((float*)cwTriVerts, cwTriIndices, 1, nullptr, MaskedOcclusionCulling::BACKFACE_CCW);
+
+	// A quad completely within the view frustum
+	ClipspaceVertex quadVerts[] = { { -150, -150, 0, 200 }, { -10, -65, 0, 75 }, { 0, 0, 0, 20 }, { -40, 10, 0, 50 } };
+	unsigned int quadIndices[] = { 0, 1, 2, 0, 2, 3 };
+
+	// Render the quad. As an optimization, indicate that clipping is not required as it is 
+	// completely inside the view frustum
+	moc->RenderTriangles((float*)quadVerts, quadIndices, 2, nullptr, MaskedOcclusionCulling::BACKFACE_CW, MaskedOcclusionCulling::CLIP_PLANE_NONE);
+
+	// A triangle specified on struct of arrays (SoA) form
+	float SoAVerts[] = {
+		 10, 10,   7, // x-coordinates
+		-10, -7, -10, // y-coordinates
+		 10, 10,  10  // w-coordinates
+	};
+
+	// Set vertex layout (stride, y offset, w offset)
+	MaskedOcclusionCulling::VertexLayout SoAVertexLayout(sizeof(float), 3 * sizeof(float), 6 * sizeof(float));
+
+	// Render triangle with SoA layout
+	moc->RenderTriangles((float*)SoAVerts, triIndices, 1, nullptr, MaskedOcclusionCulling::BACKFACE_CW, MaskedOcclusionCulling::CLIP_PLANE_ALL, SoAVertexLayout);
+
+
+	////////////////////////////////////////////////////////////////////////////////////////
+	// Perform some occlusion queries
+	////////////////////////////////////////////////////////////////////////////////////////
+
+	// A triangle, partly overlapped by the quad
+	ClipspaceVertex oqTriVerts[] = { { 0, 50, 0, 200 }, { -60, -60, 0, 200 }, { 20, -40, 0, 200 } };
+	unsigned int oqTriIndices[] = { 0, 1, 2 };
+
+	// Perform an occlusion query. The triangle is visible and the query should return VISIBLE
+	MaskedOcclusionCulling::CullingResult result;
+	result = moc->TestTriangles((float*)oqTriVerts, oqTriIndices, 1);
+	if (result == MaskedOcclusionCulling::VISIBLE)
+		printf("Tested triangle is VISIBLE\n");
+	else if (result == MaskedOcclusionCulling::OCCLUDED)
+		printf("Tested triangle is OCCLUDED\n");
+	else if (result == MaskedOcclusionCulling::VIEW_CULLED)
+		printf("Tested triangle is outside view frustum\n");
+
+	// Render the occlusion query triangle to show its position
+	moc->RenderTriangles((float*)oqTriVerts, oqTriIndices, 1);
+
+
+	// Perform an occlusion query testing if a rectangle is visible. The rectangle is completely 
+	// behind the previously drawn quad, so the query should indicate that it's occluded
+	result = moc->TestRect(-0.6f, -0.6f, -0.4f, -0.4f, 100);
+	if (result == MaskedOcclusionCulling::VISIBLE)
+		printf("Tested rect is VISIBLE\n");
+	else if (result == MaskedOcclusionCulling::OCCLUDED)
+		printf("Tested rect is OCCLUDED\n");
+	else if (result == MaskedOcclusionCulling::VIEW_CULLED)
+		printf("Tested rect is outside view frustum\n");
+
+	// Compute a per pixel depth buffer from the hierarchical depth buffer, used for visualization.
+	float *perPixelZBuffer = new float[width * height];
+	moc->ComputePixelDepthBuffer(perPixelZBuffer, false);
+
+	// Tonemap the image
+	unsigned char *image = new unsigned char[width * height * 3];
+	TonemapDepth(perPixelZBuffer, image, width, height);
+	WriteBMP("image.bmp", image, width, height);
+	delete[] image;
+
+	// Destroy occlusion culling object and free hierarchical z-buffer
+	MaskedOcclusionCulling::Destroy(moc);
+
+}
diff --git a/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/FillrateTest/FillrateTest.cpp b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/FillrateTest/FillrateTest.cpp
new file mode 100644
index 00000000..8f672c98
--- /dev/null
+++ b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/FillrateTest/FillrateTest.cpp
@@ -0,0 +1,433 @@
+////////////////////////////////////////////////////////////////////////////////
+// Copyright 2017 Intel Corporation
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License.  You may obtain a copy
+// of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+// License for the specific language governing permissions and limitations
+// under the License.
+////////////////////////////////////////////////////////////////////////////////
+#include <float.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <algorithm>
+#include <vector>
+#include <chrono>
+#include <random>
+#ifdef _WIN32
+	#include <intrin.h>
+#else
+	#include <immintrin.h>
+#endif
+
+#include "../CullingThreadpool.h"
+#include "../MaskedOcclusionCulling.h"
+
+std::mt19937 gRnd;
+std::uniform_real_distribution<float> gRndUniform(0, 1);
+
+#define F_PI 3.14159265358979323846f
+
+// if 1, makes some of the random triangles slightly out of screen and enables clipping
+#define TEST_CLIPPING 0
+
+#ifdef _WIN32
+////////////////////////////////////////////////////////////////////////////////////////
+// DX 11 setup & resource creation code
+////////////////////////////////////////////////////////////////////////////////////////
+
+#define NOMINMAX
+#include <windows.h>
+#include <d3d11.h>
+#include <d3dcompiler.h>
+
+#pragma comment (lib, "d3d11.lib")
+#pragma comment (lib, "d3dcompiler.lib")
+
+ID3D11Texture2D				*textureZ;
+ID3D11Texture2D				*textureCol, *staging;
+ID3D11DepthStencilView		*textureDSV;
+ID3D11RenderTargetView		*textureRTV;
+ID3D11Device				*device;
+ID3D11DeviceContext			*context;
+
+ID3D11RasterizerState		*rastState;
+ID3D11DepthStencilState		*DSState;
+ID3D11InputLayout			*layout;
+ID3D11VertexShader			*VS;
+ID3D11PixelShader			*PS;
+std::vector<ID3D11Buffer*>	vBuffers;
+ID3D11Query					*endQuery;
+
+#define D3DVERIFY(X) if (X != S_OK) exit(1);
+
+void InitD3D(unsigned int width, unsigned int height)
+{
+	const char *shader =
+		"float4 VShader(float4 position : POSITION) : SV_POSITION { return position; }"
+		"float4 PShader(float4 position : SV_POSITION) : SV_TARGET { return 1.0f - position.z; }";
+
+	D3D_FEATURE_LEVEL fLevel;
+	D3DVERIFY(D3D11CreateDevice(nullptr, D3D_DRIVER_TYPE_HARDWARE, nullptr, 0, nullptr, 0, D3D11_SDK_VERSION, &device, &fLevel, &context));
+
+	D3D11_TEXTURE2D_DESC tDesc;
+	tDesc.Width = width;
+	tDesc.Height = height;
+	tDesc.MipLevels = tDesc.ArraySize = 1;
+	tDesc.SampleDesc.Count = 1;
+	tDesc.SampleDesc.Quality = 0;
+	tDesc.CPUAccessFlags = 0;
+	tDesc.MiscFlags = 0;
+	tDesc.Usage = D3D11_USAGE_DEFAULT;
+
+	tDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
+	tDesc.BindFlags = D3D11_BIND_RENDER_TARGET;
+	D3DVERIFY(device->CreateTexture2D(&tDesc, nullptr, &textureCol));
+
+	tDesc.Format = DXGI_FORMAT_D24_UNORM_S8_UINT;
+	tDesc.BindFlags = D3D11_BIND_DEPTH_STENCIL;
+	D3DVERIFY(device->CreateTexture2D(&tDesc, nullptr, &textureZ));
+
+	tDesc.Usage = D3D11_USAGE_STAGING;
+	tDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
+	tDesc.BindFlags = 0;
+	tDesc.CPUAccessFlags = D3D11_CPU_ACCESS_READ;
+	D3DVERIFY(device->CreateTexture2D(&tDesc, nullptr, &staging));
+
+	D3D11_DEPTH_STENCIL_VIEW_DESC dsvDesc;
+	dsvDesc.Flags = 0;
+	dsvDesc.Format = DXGI_FORMAT_D24_UNORM_S8_UINT;
+	dsvDesc.ViewDimension = D3D11_DSV_DIMENSION_TEXTURE2D;
+	dsvDesc.Texture2D.MipSlice = 0;
+	D3DVERIFY(device->CreateDepthStencilView(textureZ, &dsvDesc, &textureDSV));
+
+	D3D11_RENDER_TARGET_VIEW_DESC rtvDesc;
+	rtvDesc.Format = DXGI_FORMAT_R8G8B8A8_UNORM;
+	rtvDesc.ViewDimension = D3D11_RTV_DIMENSION_TEXTURE2D;
+	rtvDesc.Texture2D.MipSlice = 0;
+	D3DVERIFY(device->CreateRenderTargetView(textureCol, &rtvDesc, &textureRTV));
+
+	// Set the viewport
+	D3D11_VIEWPORT viewport;
+	viewport.TopLeftX = 0;
+	viewport.TopLeftY = 0;
+	viewport.Width = (float)width;
+	viewport.Height = (float)height;
+	viewport.MinDepth = 0;
+	viewport.MaxDepth = 1;
+	context->RSSetViewports(1, &viewport);
+
+	// load and compile the two shaders
+	ID3D10Blob *VSBlob, *PSBlob;
+	D3DVERIFY(D3DCompile(shader, strlen(shader), "shader", nullptr, nullptr, "VShader", "vs_5_0", 0, 0, &VSBlob, nullptr));
+	D3DVERIFY(D3DCompile(shader, strlen(shader), "shader", nullptr, nullptr, "PShader", "ps_5_0", 0, 0, &PSBlob, nullptr));
+
+	// encapsulate both shaders into shader objects
+	D3DVERIFY(device->CreateVertexShader(VSBlob->GetBufferPointer(), VSBlob->GetBufferSize(), NULL, &VS));
+	D3DVERIFY(device->CreatePixelShader(PSBlob->GetBufferPointer(), PSBlob->GetBufferSize(), NULL, &PS));
+
+	// set the shader objects
+	context->VSSetShader(VS, 0, 0);
+	context->PSSetShader(PS, 0, 0);
+
+	// create the input layout object
+	D3D11_INPUT_ELEMENT_DESC ied[] =
+	{
+		{ "POSITION", 0, DXGI_FORMAT_R32G32B32A32_FLOAT, 0, 0, D3D11_INPUT_PER_VERTEX_DATA, 0 },
+	};
+
+	D3DVERIFY(device->CreateInputLayout(ied, 1, VSBlob->GetBufferPointer(), VSBlob->GetBufferSize(), &layout));
+	context->IASetInputLayout(layout);
+
+	D3D11_RASTERIZER_DESC rDesc;
+	rDesc.FillMode = D3D11_FILL_SOLID;
+	rDesc.CullMode = D3D11_CULL_NONE;
+	rDesc.FrontCounterClockwise = false;
+	rDesc.DepthBias = 0;
+	rDesc.DepthBiasClamp = 0;
+	rDesc.SlopeScaledDepthBias = 0;
+	rDesc.DepthClipEnable = false;
+	rDesc.ScissorEnable = false;
+	rDesc.MultisampleEnable = false;
+	rDesc.AntialiasedLineEnable = false;
+	device->CreateRasterizerState(&rDesc, &rastState);
+	context->RSSetState(rastState);
+
+	D3D11_DEPTH_STENCIL_DESC dsDesc;
+	ZeroMemory(&dsDesc, sizeof(D3D11_DEPTH_STENCIL_DESC));
+	dsDesc.DepthEnable = true;
+	dsDesc.StencilEnable = false;
+	dsDesc.DepthFunc = D3D11_COMPARISON_LESS_EQUAL;
+	dsDesc.DepthWriteMask = D3D11_DEPTH_WRITE_MASK_ALL;
+	device->CreateDepthStencilState(&dsDesc, &DSState);
+	context->OMSetDepthStencilState(DSState, 0);
+
+	D3D11_QUERY_DESC qDesc;
+	qDesc.Query = D3D11_QUERY_EVENT;
+	qDesc.MiscFlags = 0;
+	D3DVERIFY(device->CreateQuery(&qDesc, &endQuery));
+}
+
+void D3DAddTriangles(float *verts, int nTris)
+{
+	ID3D11Buffer *buf = nullptr;
+
+	D3D11_SUBRESOURCE_DATA iData;
+	iData.pSysMem = verts;
+	iData.SysMemPitch = 0;
+	iData.SysMemSlicePitch = 0;
+
+	D3D11_BUFFER_DESC bDesc;
+	bDesc.Usage = D3D11_USAGE_DEFAULT;
+	bDesc.ByteWidth = nTris * 3 * 4 * sizeof(float);
+	bDesc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
+	bDesc.CPUAccessFlags = bDesc.MiscFlags = bDesc.StructureByteStride = 0;
+	D3DVERIFY(device->CreateBuffer(&bDesc, &iData, &buf));
+	vBuffers.push_back(buf);
+}
+
+double BenchmarkTrianglesD3D(ID3D11Buffer *buf, int numTriangles, bool color)
+{
+	// set the render target as the back buffer
+	if (color)
+		context->OMSetRenderTargets(1, &textureRTV, textureDSV);
+	else
+		context->OMSetRenderTargets(0, nullptr, textureDSV);
+
+	// clear the back buffer to a deep blue
+	float clearColor[4] = { 0.0f, 1.0f, 0.0f, 1.0f };
+	context->ClearRenderTargetView(textureRTV, clearColor);
+	context->ClearDepthStencilView(textureDSV, D3D11_CLEAR_DEPTH, 1.0f, 0);
+
+	// Setup primitivelist
+	UINT stride = sizeof(float) * 4, offset = 0;
+	context->IASetVertexBuffers(0, 1, &buf, &stride, &offset);
+	context->IASetPrimitiveTopology(D3D10_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
+	context->Flush();
+
+	// Draw triangles
+	auto before = std::chrono::high_resolution_clock::now();
+	context->Begin(endQuery);
+	context->Draw(numTriangles * 3, 0);
+	context->End(endQuery);
+	while (context->GetData(endQuery, nullptr, 0, 0) == S_FALSE) {}
+	auto after = std::chrono::high_resolution_clock::now();
+
+	return std::chrono::duration<double>(after - before).count();
+}
+
+#endif
+
+////////////////////////////////////////////////////////////////////////////////////////
+// Simple random triangle rasterizer benchmark
+////////////////////////////////////////////////////////////////////////////////////////
+
+inline float frand() { return (float)rand() / (float)RAND_MAX; }
+
+void GenerateRandomTriangles(float *verts, unsigned int *triIdxBtF, int nTris, int size, float width, float height)
+{
+    // make some of the triangles slightly out of screen to test clipping paths
+#if TEST_CLIPPING
+    const float clippingMul = 1.1f;
+#else
+    const float clippingMul = 1.0f;
+#endif
+
+	for (int idx = 0; idx < nTris; ++idx)
+	{
+		triIdxBtF[idx * 3 + 0] = idx * 3 + 0;
+		triIdxBtF[idx * 3 + 1] = idx * 3 + 1;
+		triIdxBtF[idx * 3 + 2] = idx * 3 + 2;
+
+		while (true)
+		{
+			float vtx[3][3] = { { 0, 0, 1 },{ size * 2 / (float)width, 0, 1 },{ 0, size * 2 / (float)height, 1 } };
+			float offset[3] = { gRndUniform(gRnd)*2.0f - 1.0f, gRndUniform(gRnd)*2.0f - 1.0f, 0 };
+			float rotation = gRndUniform(gRnd) * 2 * F_PI;
+
+			float myz = (float)(nTris - idx);
+			bool triOk = true;
+			float rvtx[3][3];
+			for (int i = 0; i < 3; ++i)
+			{
+				rvtx[i][0] = cos(rotation)*vtx[i][0] - sin(rotation)*vtx[i][1] + offset[0];
+				rvtx[i][1] = sin(rotation)*vtx[i][0] + cos(rotation)*vtx[i][1] + offset[1];
+
+				if (rvtx[i][0] < -1.0f || rvtx[i][0] > 1.0f || rvtx[i][1] < -1.0f || rvtx[i][1] > 1.0f)
+					triOk = false;
+
+				float z = myz / (float)nTris;
+
+				int vtxIdx = idx * 3 + i;
+				verts[vtxIdx * 4 + 0] = rvtx[i][0] * myz * clippingMul;
+				verts[vtxIdx * 4 + 1] = rvtx[i][1] * myz * clippingMul;
+				verts[vtxIdx * 4 + 2] = z * myz;
+				verts[vtxIdx * 4 + 3] = myz;
+			}
+			if (triOk)
+				break;
+		}
+	}
+}
+
+double BenchmarkTriangles(float *verts, unsigned int *tris, int numTriangles, MaskedOcclusionCulling *moc)
+{
+	moc->ClearBuffer();
+
+	auto before = std::chrono::high_resolution_clock::now();
+#if TEST_CLIPPING
+    moc->RenderTriangles( verts, tris, numTriangles, nullptr, MaskedOcclusionCulling::BACKFACE_CW, MaskedOcclusionCulling::CLIP_PLANE_ALL );
+#else
+	moc->RenderTriangles(verts, tris, numTriangles, nullptr, MaskedOcclusionCulling::BACKFACE_CW, MaskedOcclusionCulling::CLIP_PLANE_NONE);
+#endif
+	auto after = std::chrono::high_resolution_clock::now();
+
+	return std::chrono::duration<double>(after - before).count();
+}
+
+double BenchmarkTrianglesThreaded(float *verts, unsigned int *tris, int numTriangles, CullingThreadpool *ctp) 
+{
+	ctp->ClearBuffer();
+
+	auto before = std::chrono::high_resolution_clock::now();
+#if TEST_CLIPPING
+    ctp->RenderTriangles(verts, tris, numTriangles, MaskedOcclusionCulling::BACKFACE_CW, MaskedOcclusionCulling::CLIP_PLANE_ALL);
+#else
+    ctp->RenderTriangles( verts, tris, numTriangles, MaskedOcclusionCulling::BACKFACE_CW, MaskedOcclusionCulling::CLIP_PLANE_NONE );
+#endif
+	ctp->Flush();
+	auto after = std::chrono::high_resolution_clock::now();
+
+	return std::chrono::duration<double>(after - before).count();
+}
+
+////////////////////////////////////////////////////////////////////////////////////////
+// Perform basic fillrate benchmarks for GPU and compare with this libray
+////////////////////////////////////////////////////////////////////////////////////////
+
+int main(int argc, char* argv[])
+{
+	const int width = 1920, height = 1080;
+
+	// Flush denorms to zero to avoid performance issues with small values
+	_mm_setcsr(_mm_getcsr() | 0x8040);
+
+	MaskedOcclusionCulling *moc = MaskedOcclusionCulling::Create();
+
+
+#ifdef _WIN32
+	// Initialize directx
+	InitD3D(width, height);
+#endif
+
+	////////////////////////////////////////////////////////////////////////////////////////
+	// Setup and state related code
+	////////////////////////////////////////////////////////////////////////////////////////
+
+	// Setup a rendertarget with near clip plane at w = 1.0
+	moc->SetResolution(width, height);
+	moc->SetNearClipPlane(1.0f);
+
+	////////////////////////////////////////////////////////////////////////////////////////
+	// Create randomized triangles for back-to-front and front-to-back rendering
+	////////////////////////////////////////////////////////////////////////////////////////
+
+	const int numTriangles[] = { 4096 * 1024, 4096 * 1024, 4096 * 1024, 2048 * 1024, 1024 * 1024, 512 * 1024, 256 * 1024 };
+	const int sizes[] = { 10, 25, 50, 75, 100, 250, 500 };
+
+	int numSizes = sizeof(sizes) / sizeof(int);
+
+	printf("Generating randomized triangles");
+	std::vector<unsigned int *> trisBtF;
+	std::vector<float *>		verts;
+	for (int i = 0; i < numSizes; ++i)
+	{
+		float *pVerts = new float[numTriangles[i] * 4 * 3];
+		unsigned int *pTrisBtF = new unsigned int[numTriangles[i] * 3];
+		GenerateRandomTriangles(pVerts, pTrisBtF, numTriangles[i], sizes[i], (float)width, (float)height);
+		verts.push_back(pVerts);
+		trisBtF.push_back(pTrisBtF);
+#ifdef _WIN32
+		D3DAddTriangles(pVerts, numTriangles[i]);
+#endif
+		printf(".");
+	}
+
+	////////////////////////////////////////////////////////////////////////////////////////
+	// Perform benchmarks
+	////////////////////////////////////////////////////////////////////////////////////////
+#ifdef _WIN32
+	printf("\nD3D Z only\n");
+	printf("----\n");
+	for (int i = 0; i < numSizes; ++i)
+	{
+		int size = sizes[i];
+		double t = BenchmarkTrianglesD3D(vBuffers[i], numTriangles[i], false);
+		double GPixelsPerSecond = (double)numTriangles[i] * size*size / (2.0 * 1e9 * t);
+		double MTrisPerSecond = (double)numTriangles[i] / (1e6 * t);
+		printf("Tri: %3dx%3d - Time: %7.2f ms, MTris/s: %6.2f GPixels/s: %5.2f \n", size, size, t * 1000.0f, MTrisPerSecond, GPixelsPerSecond);
+	}
+#endif
+
+    printf( "\nInstruction set:" );
+    switch( moc->GetImplementation( ) )
+    {
+    case MaskedOcclusionCulling::SSE2:
+        printf( "SSE2\n" );
+        break;
+    case MaskedOcclusionCulling::SSE41:
+        printf( "SSE41\n" );
+        break;
+    case MaskedOcclusionCulling::AVX2:
+        printf( "AVX2\n" );
+        break;
+    case MaskedOcclusionCulling::AVX512:
+        printf( "AVX512\n\n" );
+        break;
+    default:
+        break;
+
+    };
+
+#if 0 && MOC_RECORDER_ENABLE
+    moc->RecorderStart( "..\\FrameRecorderPlayer\\FillrateTest.mocrec" );
+#endif
+
+	printf("\n\nMasked single threaded\n");
+	printf("----\n");
+	for (int i = 0; i < numSizes; ++i)
+	{
+		int size = sizes[i];
+		double t = BenchmarkTriangles(verts[i], trisBtF[i], numTriangles[i], moc);
+		double GPixelsPerSecond = (double)numTriangles[i] * size*size / (2.0 * 1e9 * t);
+		double MTrisPerSecond = (double)numTriangles[i] / (1e6 * t);
+		printf("Tri: %3dx%3d - Time: %7.2f ms, MTris/s: %6.2f GPixels/s: %5.2f \n", size, size, t * 1000.0f, MTrisPerSecond, GPixelsPerSecond);
+	}
+
+#if 0 && MOC_RECORDER_ENABLE
+    moc->RecorderStop( );
+#endif
+
+	int numThreads = std::thread::hardware_concurrency() - 1;
+	printf("\n\nMasked multi threaded (%d threads)\n", numThreads);
+	printf("----\n");
+	CullingThreadpool ctp(numThreads, 2, numThreads);
+	ctp.SetBuffer(moc);
+	ctp.WakeThreads();
+	for (int i = 0; i < numSizes; ++i)
+	{
+		int size = sizes[i];
+		double t = BenchmarkTrianglesThreaded(verts[i], trisBtF[i], numTriangles[i], &ctp);
+		double GPixelsPerSecond = (double)numTriangles[i] * size*size / (2.0 * 1e9 * t);
+		double MTrisPerSecond = (double)numTriangles[i] / (1e6 * t);
+		printf("Tri: %3dx%3d - Time: %7.2f ms, MTris/s: %6.2f GPixels/s: %5.2f \n", size, size, t * 1000.0f, MTrisPerSecond, GPixelsPerSecond);
+	}
+	ctp.SuspendThreads();
+}
\ No newline at end of file
diff --git a/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/FillrateTest/FillrateTest.vcxproj.filters b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/FillrateTest/FillrateTest.vcxproj.filters
new file mode 100644
index 00000000..8aab38cb
--- /dev/null
+++ b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/FillrateTest/FillrateTest.vcxproj.filters
@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <ClCompile Include="FillrateTest.cpp" />
+    <ClCompile Include="..\CullingThreadpool.cpp">
+      <Filter>MaskedOcclusionCulling</Filter>
+    </ClCompile>
+    <ClCompile Include="..\MaskedOcclusionCulling.cpp">
+      <Filter>MaskedOcclusionCulling</Filter>
+    </ClCompile>
+    <ClCompile Include="..\MaskedOcclusionCullingAVX2.cpp">
+      <Filter>MaskedOcclusionCulling</Filter>
+    </ClCompile>
+    <ClCompile Include="..\MaskedOcclusionCullingAVX512.cpp">
+      <Filter>MaskedOcclusionCulling</Filter>
+    </ClCompile>
+    <ClCompile Include="..\FrameRecorder.cpp">
+      <Filter>MaskedOcclusionCulling</Filter>
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="..\CullingThreadpool.h">
+      <Filter>MaskedOcclusionCulling</Filter>
+    </ClInclude>
+    <ClInclude Include="..\MaskedOcclusionCulling.h">
+      <Filter>MaskedOcclusionCulling</Filter>
+    </ClInclude>
+    <ClInclude Include="..\FrameRecorder.h">
+      <Filter>MaskedOcclusionCulling</Filter>
+    </ClInclude>
+  </ItemGroup>
+  <ItemGroup>
+    <Filter Include="MaskedOcclusionCulling">
+      <UniqueIdentifier>{b848f282-5fc0-4806-b33e-649bedd84f85}</UniqueIdentifier>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="..\MaskedOcclusionCullingCommon.inl">
+      <Filter>MaskedOcclusionCulling</Filter>
+    </None>
+    <None Include="..\CompilerSpecific.inl">
+      <Filter>MaskedOcclusionCulling</Filter>
+    </None>
+  </ItemGroup>
+</Project>
\ No newline at end of file
diff --git a/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/FrameRecorder.cpp b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/FrameRecorder.cpp
new file mode 100644
index 00000000..666f80cb
--- /dev/null
+++ b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/FrameRecorder.cpp
@@ -0,0 +1,452 @@
+////////////////////////////////////////////////////////////////////////////////
+// Copyright 2017 Intel Corporation
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License.  You may obtain a copy
+// of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+// License for the specific language governing permissions and limitations
+// under the License.
+////////////////////////////////////////////////////////////////////////////////
+#include "FrameRecorder.h"
+
+#if MOC_RECORDER_ENABLE
+#include <assert.h>
+#include <algorithm>
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Masked occlusion culling 
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+bool MaskedOcclusionCulling::RecorderStart( const char * outputFilePath ) const
+{
+    std::lock_guard<std::mutex> lock( mRecorderMutex );
+
+    assert( mRecorder == nullptr ); // forgot to call RecorderStop?
+    if( mRecorder != nullptr )
+        return false;
+
+#if MOC_RECORDER_USE_STDIO_FILE
+    FILE * f;
+    if( fopen_s( &f, outputFilePath, "wb" ) != 0 )
+        return false;
+#else
+    std::ofstream outStream( outputFilePath, std::ios::out | std::ios::trunc | std::ios::binary );
+    if( !outStream.is_open( ) )
+        return false;
+#endif
+    mRecorder = (FrameRecorder *)mAlignedAllocCallback( 64, sizeof( FrameRecorder ) );
+#if MOC_RECORDER_USE_STDIO_FILE
+    new (mRecorder) FrameRecorder( f, *this );
+#else
+    new (mRecorder) FrameRecorder( std::move( outStream ), *this );
+#endif
+
+    return true;
+}
+
+void MaskedOcclusionCulling::RecorderStop( ) const
+{
+    std::lock_guard<std::mutex> lock( mRecorderMutex );
+
+    mRecorder->~FrameRecorder();
+    mAlignedFreeCallback( mRecorder );
+    mRecorder = nullptr;
+}
+
+void MaskedOcclusionCulling::RecordRenderTriangles( const float *inVtx, const unsigned int *inTris, int nTris, const float *modelToClipMatrix, ClipPlanes clipPlaneMask, BackfaceWinding bfWinding, const VertexLayout &vtxLayout, CullingResult cullingResult )
+{
+    std::lock_guard<std::mutex> lock( mRecorderMutex );
+    if( mRecorder != nullptr ) 
+        mRecorder->RecordRenderTriangles( cullingResult, inVtx, inTris, nTris, modelToClipMatrix, clipPlaneMask, bfWinding, vtxLayout );
+}
+
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Masked occlusion culling recorder
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+#if MOC_RECORDER_USE_STDIO_FILE
+FrameRecorder::FrameRecorder( FILE *& outFile, const MaskedOcclusionCulling & moc )
+#else
+FrameRecorder::FrameRecorder( std::ofstream && outStream, const MaskedOcclusionCulling & moc ) : mOutStream( std::move( outStream ) )
+#endif
+{
+#if MOC_RECORDER_USE_STDIO_FILE
+    mOutFile = outFile;
+    outFile = 0;
+    assert( mOutFile != 0 );
+#else
+    assert( mOutStream.is_open( ) );
+#endif
+
+    // for file verification purposes
+    unsigned int fileHeader = 0xA701B600;
+    Write( &fileHeader, sizeof( fileHeader ) );
+
+    // save some of the MOC states (we can override them for the playback)
+    float nearClipPlane = moc.GetNearClipPlane();
+    unsigned int width;
+    unsigned int height;
+    moc.GetResolution( width, height );
+
+    Write( &nearClipPlane, sizeof( nearClipPlane ) );
+    Write( &width, sizeof( width ) );
+    Write( &height, sizeof( height ) );
+}
+
+FrameRecorder::~FrameRecorder( )
+{
+    // end of file marker
+    char footer = 0x7F;
+    Write( &footer, 1 );
+
+#if MOC_RECORDER_USE_STDIO_FILE
+    fclose( mOutFile );
+#else
+    mOutStream.close( );
+#endif
+}
+
+void FrameRecorder::Write( const void * buffer, size_t size )
+{
+#if MOC_RECORDER_USE_STDIO_FILE
+    fwrite( buffer, 1, size, mOutFile );
+#else
+    mOutStream.write( (const char *)buffer, size );
+#endif
+}
+
+void FrameRecorder::WriteTriangleRecording( MaskedOcclusionCulling::CullingResult cullingResult, const float *inVtx, const unsigned int *inTris, int nTris, const float *modelToClipMatrix, MaskedOcclusionCulling::ClipPlanes clipPlaneMask, MaskedOcclusionCulling::BackfaceWinding bfWinding, const MaskedOcclusionCulling::VertexLayout & vtxLayout )
+{
+    // write culling result
+    Write( &cullingResult, sizeof( cullingResult ) );
+
+    unsigned int minVIndex = 0xffffffff;
+    unsigned int maxVIndex = 0;
+    for( int i = 0; i < nTris; i++ )
+    {
+        const unsigned int & a = inTris[i * 3 + 0];
+        const unsigned int & b = inTris[i * 3 + 1];
+        const unsigned int & c = inTris[i * 3 + 2];
+        minVIndex = std::min( std::min( minVIndex, a ), std::min( b, c ) );
+        maxVIndex = std::max( std::max( maxVIndex, a ), std::max( b, c ) );
+    }
+
+    // write actually used vertex count
+    int vertexCount = ( maxVIndex < minVIndex ) ? ( 0 ) : ( maxVIndex - minVIndex + 1 );
+    Write( &vertexCount, sizeof( vertexCount ) );
+
+    // nothing more to write? early exit
+    if( vertexCount == 0 )
+        return;
+
+    // write vertex size
+    int vertexSize = vtxLayout.mStride;
+    Write( &vertexSize, sizeof( vertexSize ) );
+
+    // write vertices
+    Write( ( (const char*)inVtx ) + minVIndex*vertexSize, vertexSize * ( vertexCount ) );
+
+    // write triangle count
+    Write( &nTris, sizeof( nTris ) );
+
+    // write indices with adjusted offset
+    for( int i = 0; i < nTris; i++ )
+    {
+        unsigned int triangleIndices[3];
+        triangleIndices[0] = inTris[i * 3 + 0] - minVIndex;
+        triangleIndices[1] = inTris[i * 3 + 1] - minVIndex;
+        triangleIndices[2] = inTris[i * 3 + 2] - minVIndex;
+        Write( triangleIndices, sizeof( triangleIndices ) );
+    }
+
+    // write model to clip matrix (if any)
+    char hasMatrix = ( modelToClipMatrix != nullptr ) ? ( 1 ) : ( 0 );
+    Write( &hasMatrix, sizeof( hasMatrix ) );
+    if( hasMatrix )
+        Write( modelToClipMatrix, 16 * sizeof( float ) );
+
+    Write( &clipPlaneMask, sizeof( clipPlaneMask ) );
+
+    Write( &bfWinding, sizeof( bfWinding ) );
+
+    // write vertex layout
+    Write( &vtxLayout, sizeof( vtxLayout ) );
+}
+
+namespace 
+{ 
+    // Warning, takes ownership of the underlying stream and closes it at the end
+    struct InStreamWrapper
+    {
+#if MOC_RECORDER_USE_STDIO_FILE
+        FILE *              mInFile;
+#else
+        std::ifstream       mInStream;
+#endif
+
+#if MOC_RECORDER_USE_STDIO_FILE
+        InStreamWrapper( FILE *& inFile )           { mInFile = inFile; assert( mInFile != 0 ); inFile = 0; }
+        ~InStreamWrapper( )                         { fclose( mInFile ); }
+#else
+        InStreamWrapper( std::ifstream && inStream ) : mInStream( std::move( inStream ) ) { assert( mInStream.is_open() ); }
+#endif
+
+        size_t Read( void * buffer, size_t size )
+        {
+#if MOC_RECORDER_USE_STDIO_FILE
+            return fread( buffer, 1, size, mInFile );
+#else
+            mInStream.read( (char*)buffer, size );
+            return mInStream.gcount( );
+#endif
+        }
+    };
+}
+
+void FrameRecorder::RecordClearBuffer( )
+{
+    char header = 3;
+    Write( &header, 1 );
+}
+
+void FrameRecorder::RecordRenderTriangles( MaskedOcclusionCulling::CullingResult cullingResult, const float *inVtx, const unsigned int *inTris, int nTris, const float *modelToClipMatrix, MaskedOcclusionCulling::ClipPlanes clipPlaneMask, MaskedOcclusionCulling::BackfaceWinding bfWinding, const MaskedOcclusionCulling::VertexLayout & vtxLayout )
+{
+    char header = 0;
+    Write( &header, 1 );
+    WriteTriangleRecording( cullingResult, inVtx, inTris, nTris, modelToClipMatrix, clipPlaneMask, bfWinding, vtxLayout );
+}
+
+void FrameRecorder::RecordTestRect( MaskedOcclusionCulling::CullingResult cullingResult, float xmin, float ymin, float xmax, float ymax, float wmin )
+{
+    char header = 1;
+    Write( &header, 1 );
+
+    Write( &cullingResult, sizeof( cullingResult ) );
+    Write( &xmin, sizeof( xmin ) );
+    Write( &ymin, sizeof( ymin ) );
+    Write( &xmax, sizeof( xmax ) );
+    Write( &ymax, sizeof( ymax ) );
+    Write( &wmin, sizeof( wmin ) );
+}
+
+void FrameRecorder::RecordTestTriangles( MaskedOcclusionCulling::CullingResult cullingResult, const float *inVtx, const unsigned int *inTris, int nTris, const float *modelToClipMatrix, MaskedOcclusionCulling::ClipPlanes clipPlaneMask, MaskedOcclusionCulling::BackfaceWinding bfWinding, const MaskedOcclusionCulling::VertexLayout & vtxLayout )
+{
+    char header = 2;
+    Write( &header, 1 );
+    WriteTriangleRecording( cullingResult, inVtx, inTris, nTris, modelToClipMatrix, clipPlaneMask, bfWinding, vtxLayout );
+}
+
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Masked occlusion culling recording
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+
+#if MOC_RECORDER_ENABLE_PLAYBACK
+
+static bool ReadTriangleRecording( FrameRecording::TrianglesEntry & outEntry, InStreamWrapper & inStream )
+{
+    // read culling result
+    if( inStream.Read( (char*)&outEntry.mCullingResult, sizeof( outEntry.mCullingResult ) ) != sizeof( outEntry.mCullingResult ) )
+    {
+        assert( false );
+        return false;
+    }
+
+    // read used vertex count
+    int vertexCount = 0;
+    if( inStream.Read( (char*)&vertexCount, sizeof( vertexCount ) ) != sizeof( vertexCount ) )
+    {
+        assert( false );
+        return false;
+    }
+
+    // nothing in the recording? that's ok, just exit
+    if( vertexCount == 0 )
+    {
+        outEntry.mVertices.clear( );
+        outEntry.mTriangles.clear( );
+        return true;
+    }
+
+
+    // read vertex size
+    int vertexSize = 0;
+    if( inStream.Read( (char*)&vertexSize, sizeof( vertexSize ) ) != sizeof( vertexSize ) )
+    {
+        assert( false );
+        return false;
+    }
+
+    // read vertices
+    outEntry.mVertices.resize( vertexSize / 4 * vertexCount );  // pre-allocate data
+    if( inStream.Read( (char*)outEntry.mVertices.data( ), vertexSize * vertexCount ) != ( vertexSize * vertexCount ) )
+    {
+        assert( false );
+        return false;
+    }
+
+    // read triangle count
+    int triangleCount = 0;
+    if( inStream.Read( (char*)&triangleCount, sizeof( triangleCount ) ) != sizeof( triangleCount ) )
+    {
+        assert( false );
+        return false;
+    }
+
+    outEntry.mTriangles.resize( triangleCount * 3 );
+    if( inStream.Read( (char*)outEntry.mTriangles.data( ), triangleCount * 3 * 4 ) != ( triangleCount * 3 * 4 ) )
+    {
+        assert( false );
+        return false;
+    }
+
+    // read matrix (if any)
+    char hasMatrix = 0;
+    if( inStream.Read( (char*)&hasMatrix, sizeof( hasMatrix ) ) != sizeof( hasMatrix ) )
+    {
+        assert( false );
+        return false;
+    }
+
+    if( ( outEntry.mHasModelToClipMatrix = ( hasMatrix != 0 ) ) )
+    {
+        if( inStream.Read( (char*)outEntry.mModelToClipMatrix, 16 * sizeof( float ) ) != 16 * sizeof( float ) )
+        {
+            assert( false );
+            return false;
+        }
+    }
+    else
+    {
+        memset( outEntry.mModelToClipMatrix, 0, 16 * sizeof( float ) );
+    }
+
+    if( inStream.Read( (char*)&outEntry.mClipPlaneMask, sizeof( outEntry.mClipPlaneMask ) ) != sizeof( outEntry.mClipPlaneMask ) )
+    {
+        assert( false );
+        return false;
+    }
+
+    // read triangle cull winding
+    if( inStream.Read( (char*)&outEntry.mbfWinding, sizeof( outEntry.mbfWinding ) ) != sizeof( outEntry.mbfWinding ) )
+    {
+        assert( false );
+        return false;
+    }
+
+    // read vertex layout
+    if( inStream.Read( (char*)&outEntry.mVertexLayout, sizeof( outEntry.mVertexLayout ) ) != sizeof( outEntry.mVertexLayout ) )
+    {
+        assert( false );
+        return false;
+    }
+    if( outEntry.mVertexLayout.mStride != vertexSize )
+    {
+        assert( false );
+        return false;
+    }
+    return true;
+}
+
+bool FrameRecording::Load( const char * inputFilePath, FrameRecording & outRecording )
+{
+    outRecording.Reset();
+
+#if MOC_RECORDER_USE_STDIO_FILE
+    FILE * inIOFile = 0;
+    if( fopen_s( &inIOFile, inputFilePath, "rb" ) != 0 )
+        return false;
+    InStreamWrapper inStream( inIOFile );
+#else
+    std::ifstream inIOStream( inputFilePath, std::ios::binary );
+    if( !inIOStream.is_open( ) )
+    {
+        return false;
+    }
+    InStreamWrapper inStream( std::move(inIOStream) );
+#endif
+    
+    // for file verification purposes
+    unsigned int fileHeader = 0;
+    if( ( inStream.Read( (char *)&fileHeader, sizeof( fileHeader ) ) != 4 ) || (fileHeader != 0xA701B600) )
+    {
+        assert( false );
+        return false;
+    }
+
+    if( inStream.Read( (char *)&outRecording.mNearClipPlane,    sizeof( outRecording.mNearClipPlane )       ) != sizeof( outRecording.mNearClipPlane )    )     { assert( false ); return false; }
+    if( inStream.Read( (char *)&outRecording.mResolutionWidth,  sizeof( outRecording.mResolutionWidth )     ) != sizeof( outRecording.mResolutionWidth )  )     { assert( false ); return false; }
+    if( inStream.Read( (char *)&outRecording.mResolutionHeight, sizeof( outRecording.mResolutionHeight )    ) != sizeof( outRecording.mResolutionHeight ) )     { assert( false ); return false; }
+
+    bool continueLoading = true;
+    while( continueLoading )
+    {
+        char chunkHeader = 0;
+        if( inStream.Read( (char *)&chunkHeader, sizeof( chunkHeader ) ) != 1 )
+        {
+            assert( false );
+            outRecording.Reset();
+            return false;
+        }
+        switch( chunkHeader )
+        {
+            case( 0 ):      // RenderTriangles
+            case( 2 ):      // TestTriangles
+            {
+                outRecording.mTriangleEntries.push_back( TrianglesEntry() );
+                int triangleEntryIndex = (int)outRecording.mTriangleEntries.size( )-1;
+                if( !ReadTriangleRecording( outRecording.mTriangleEntries[triangleEntryIndex], inStream ) )
+                { 
+                    assert( false );
+                    outRecording.Reset( );
+                    return false;
+                }
+                outRecording.mPlaybackOrder.push_back( std::make_pair( chunkHeader, triangleEntryIndex )  );
+            } break;
+            case( 1 ):      // TestRect
+            {
+                outRecording.mRectEntries.push_back( RectEntry( ) );
+                int rectEntryIndex = (int)outRecording.mRectEntries.size( )-1;
+
+                // read rectangle in one go
+                if( inStream.Read( (char*)&outRecording.mRectEntries[rectEntryIndex], sizeof( outRecording.mRectEntries[rectEntryIndex] ) ) != sizeof( outRecording.mRectEntries[rectEntryIndex] ) )
+                {
+                    assert( false );
+                    outRecording.Reset( );
+                    return false;
+                }
+                outRecording.mPlaybackOrder.push_back( std::make_pair( chunkHeader, rectEntryIndex ) );
+            } break;
+            case( 3 ):      // ClearBuffer
+            {
+                outRecording.mPlaybackOrder.push_back( std::make_pair( 3, -1 ) );
+            } break;
+            case( 0x7F ):   // eOF
+            {
+                continueLoading = false;
+                return true;
+            } break;
+            default:
+            {
+                assert( false );
+                outRecording.Reset( );
+                return false;
+            }
+        }
+    }
+
+    assert( false );    // we should never get here
+    return true;
+}
+
+#endif // #if MOC_RECORDER_ENABLE_PLAYBACK
+
+#endif // #if MOC_RECORDER_ENABLE
\ No newline at end of file
diff --git a/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/FrameRecorder.h b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/FrameRecorder.h
new file mode 100644
index 00000000..3dfa0e93
--- /dev/null
+++ b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/FrameRecorder.h
@@ -0,0 +1,180 @@
+////////////////////////////////////////////////////////////////////////////////
+// Copyright 2017 Intel Corporation
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License.  You may obtain a copy
+// of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+// License for the specific language governing permissions and limitations
+// under the License.
+////////////////////////////////////////////////////////////////////////////////
+#pragma once
+
+ /*!
+  * \file FrameRecorder.h
+  * \brief Masked occlusion culling recorder class (set MOC_RECORDER_ENABLE to 1 to enable)
+  *
+  * Masked occlusion culling recorder class (To enable, set MOC_RECORDER_ENABLE to 1 in MaskedOcclusionCulling.h)
+  *
+  * Enables gathering and storing all triangle rendering and all testing calls and their results to a file, for
+  * later playback and performance testing.
+  * Usage info:
+  *  - Calling MaskedOcclusionCulling::RecorderStart with a file name will open the file and start recording all subsequent
+  *    triangle rendering and any testing calls including the test results, and MaskedOcclusionCulling::RecorderStop will 
+  *    stop recording and close the file.
+  *  - ClearBuffer-s are not recorded so if recording multiple frames, Start/RecorderStop is needed for each frame. For 
+  *    correctness testing, the recording should be started around or after ClearBuffer, before any other "Render" calls.
+  *  - BinTriangles and RenderTrilist calls are NOT recorded; If using a custom multithreaded rendering, one should 
+  *    record input triangles by manually calling MaskedOcclusionCulling::RecordRenderTriangles - see 
+  *    CullingThreadpool::RenderTriangles for an example. 
+  *    This is done intentionally in order to get raw input triangles so we can performance test and optimize various
+  *    thread pool approaches.
+  */
+
+#include "MaskedOcclusionCulling.h"
+
+#ifndef MOC_RECORDER_USE_STDIO_FILE
+/*!
+ * Whether to use FILE or std::ofstream/istream for file access (to avoid compatibility issues in some environments)
+ */
+#define MOC_RECORDER_USE_STDIO_FILE         1
+#endif
+
+#if MOC_RECORDER_ENABLE
+
+#if MOC_RECORDER_USE_STDIO_FILE
+#include <stdio.h>
+#else
+#include <fstream>
+#endif
+
+#include <mutex>
+
+class FrameRecorder
+{
+#if MOC_RECORDER_USE_STDIO_FILE
+    FILE *              mOutFile;
+#else
+    std::ofstream       mOutStream;
+#endif
+
+protected:
+	friend class MaskedOcclusionCulling;
+#if MOC_RECORDER_USE_STDIO_FILE
+    FrameRecorder( FILE *& outFile, const MaskedOcclusionCulling & moc );
+#else
+	FrameRecorder( std::ofstream && outStream, const MaskedOcclusionCulling & moc );
+#endif
+
+public:
+    ~FrameRecorder( );
+
+protected:
+    void Write( const void * buffer, size_t size );
+    void WriteTriangleRecording( MaskedOcclusionCulling::CullingResult cullingResult, const float *inVtx, const unsigned int *inTris, int nTris, const float *modelToClipMatrix, MaskedOcclusionCulling::ClipPlanes clipPlaneMask, MaskedOcclusionCulling::BackfaceWinding bfWinding, const MaskedOcclusionCulling::VertexLayout & vtxLayout );
+
+public:
+    void RecordClearBuffer( );
+	void RecordRenderTriangles( MaskedOcclusionCulling::CullingResult cullingResult, const float *inVtx, const unsigned int *inTris, int nTris, const float *modelToClipMatrix, MaskedOcclusionCulling::ClipPlanes clipPlaneMask, MaskedOcclusionCulling::BackfaceWinding bfWinding, const MaskedOcclusionCulling::VertexLayout &vtxLayout );
+	void RecordTestRect( MaskedOcclusionCulling::CullingResult cullingResult, float xmin, float ymin, float xmax, float ymax, float wmin );
+	void RecordTestTriangles( MaskedOcclusionCulling::CullingResult cullingResult, const float *inVtx, const unsigned int *inTris, int nTris, const float *modelToClipMatrix, MaskedOcclusionCulling::ClipPlanes clipPlaneMask, MaskedOcclusionCulling::BackfaceWinding bfWinding, const MaskedOcclusionCulling::VertexLayout &vtxLayout );
+};
+
+#if MOC_RECORDER_ENABLE_PLAYBACK
+#include <vector>
+
+#if 0 // For future use - in case all vector uses below need conversion to custom allocator
+template <class T>
+struct MOCVectorAllocator
+{
+    const MaskedOcclusionCulling::pfnAlignedAlloc   m_alloc;
+    const MaskedOcclusionCulling::pfnAlignedFree    m_free;
+    typedef T value_type;
+    MOCVectorAllocator( ) = delete;
+    MOCVectorAllocator( MaskedOcclusionCulling::pfnAlignedAlloc alloc, MaskedOcclusionCulling::pfnAlignedFree free ) noexcept : m_alloc( alloc ), m_free( free ) { }
+    template <class U> constexpr MOCVectorAllocator( const MOCVectorAllocator<U>& c ) noexcept : m_alloc( c.m_alloc ), m_free( c.m_free ) {}
+    T* allocate( std::size_t n )
+    {
+        if( n > std::size_t( -1 ) / sizeof( T ) ) throw std::bad_alloc( );
+        if( auto p = static_cast<T*>( m_alloc( 64, n * sizeof( T ) ) ) ) return p;
+        throw std::bad_alloc( );
+    }
+    void deallocate( T* p, std::size_t ) noexcept
+    {
+        m_free( p );
+    }
+};
+template <class T, class U>
+inline bool operator==( const MOCVectorAllocator<T>&, const MOCVectorAllocator<U>& ) { return true; }
+template <class T, class U>
+inline bool operator!=( const MOCVectorAllocator<T>&, const MOCVectorAllocator<U>& ) { return false; }
+#endif
+
+struct FrameRecording
+{
+	struct TrianglesEntry
+	{
+		MaskedOcclusionCulling::CullingResult	mCullingResult;
+		std::vector<float>						mVertices;
+		std::vector<unsigned int>				mTriangles;
+		float									mModelToClipMatrix[16];
+		MaskedOcclusionCulling::BackfaceWinding	mbfWinding;
+		MaskedOcclusionCulling::VertexLayout	mVertexLayout;
+		MaskedOcclusionCulling::ClipPlanes		mClipPlaneMask;
+		bool									mHasModelToClipMatrix;
+		bool									mHasScissorRect;
+	};
+	struct RectEntry
+	{
+		MaskedOcclusionCulling::CullingResult mCullingResult;
+		float mXMin;
+		float mYMin;
+		float mXMax;
+		float mYMax;
+		float mWMin;
+    };
+
+	// list of type&index pairs for playback ( type 0 is RenderTriangles, type 1 is TestRect, type 2 is TestTriangles, type 3 is ClearBuffer )
+	std::vector< std::pair< char, int > >	mPlaybackOrder;
+
+	std::vector< TrianglesEntry >			mTriangleEntries;
+	std::vector< RectEntry >				mRectEntries;
+
+    float                                   mNearClipPlane;
+    unsigned int                            mResolutionWidth;
+    unsigned int                            mResolutionHeight;
+
+    FrameRecording( ) = default;
+    FrameRecording( const FrameRecording & other ) = default;
+
+    FrameRecording( FrameRecording && other )
+    {
+        mPlaybackOrder = std::move( other.mPlaybackOrder );
+        mTriangleEntries = std::move( other.mTriangleEntries );
+        mRectEntries = std::move( other.mRectEntries );
+        mNearClipPlane = other.mNearClipPlane;
+        mResolutionWidth = other.mResolutionWidth;
+        mResolutionHeight = other.mResolutionHeight;
+    }
+
+	void Reset( )
+	{
+		mPlaybackOrder.clear();
+		mTriangleEntries.clear();
+		mRectEntries.clear();
+        mNearClipPlane = 0.0f;
+        mResolutionWidth = 0;
+        mResolutionHeight = 0;
+	}
+
+	static bool Load( const char * inputFilePath, FrameRecording & outRecording );
+};
+
+#endif // #if MOC_RECORDER_ENABLE_PLAYBACK
+
+#endif // #if MOC_RECORDER_ENABLE
\ No newline at end of file
diff --git a/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/FrameRecorderPlayer/FrameRecorderPlayer.cpp b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/FrameRecorderPlayer/FrameRecorderPlayer.cpp
new file mode 100644
index 00000000..2ece5c29
--- /dev/null
+++ b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/FrameRecorderPlayer/FrameRecorderPlayer.cpp
@@ -0,0 +1,411 @@
+////////////////////////////////////////////////////////////////////////////////
+// Copyright 2017 Intel Corporation
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License.  You may obtain a copy
+// of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+// License for the specific language governing permissions and limitations
+// under the License.
+////////////////////////////////////////////////////////////////////////////////
+#include <float.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <intrin.h>
+#include <math.h>
+#include <assert.h>
+#include <algorithm>
+#include <vector>
+#include <chrono>
+#include <random>
+#include <filesystem>
+#include <inttypes.h>
+
+#include "../CullingThreadpool.h"
+#include "../MaskedOcclusionCulling.h"
+#include "../FrameRecorder.h"
+
+#if !MOC_RECORDER_ENABLE
+#error This project needs to be compiled with MOC_RECORDER_ENABLE set to 1
+#endif
+
+#if !MOC_RECORDER_ENABLE_PLAYBACK
+#error This project needs to be compiled with MOC_RECORDER_ENABLE_PLAYBACK set to 1
+#endif
+
+////////////////////////////////////////////////////////////////////////////////////////
+// Image utility functions, minimal BMP writer and depth buffer tone mapping
+////////////////////////////////////////////////////////////////////////////////////////
+
+static void WriteBMP( const char *filename, const unsigned char *data, int w, int h )
+{
+    short header[] = { 0x4D42, 0, 0, 0, 0, 26, 0, 12, 0, (short)w, (short)h, 1, 24 };
+#pragma warning ( suppress : 4996 )
+    FILE * f;
+    if( fopen_s( &f, filename, "wb" ) == 0 )
+    {
+        fwrite( header, 1, sizeof( header ), f );
+        fwrite( data, 1, w * h * 3, f );
+        fclose( f );
+    }
+    else
+    {
+        printf( "\nError trying to save to %s", filename );
+    }
+}
+
+static void TonemapDepth( float *depth, unsigned char *image, int w, int h )
+{
+    // Find min/max w coordinate (discard cleared pixels)
+    float minW = FLT_MAX, maxW = 0.0f;
+    for( int i = 0; i < w*h; ++i )
+    {
+        if( depth[i] > 0.0f )
+        {
+            minW = std::min( minW, depth[i] );
+            maxW = std::max( maxW, depth[i] );
+        }
+    }
+
+    // Tonemap depth values
+    for( int i = 0; i < w*h; ++i )
+    {
+        int intensity = 0;
+        if( depth[i] > 0 )
+            intensity = (unsigned char)( 223.0*( depth[i] - minW ) / ( maxW - minW ) + 32.0 );
+
+        image[i * 3 + 0] = intensity;
+        image[i * 3 + 1] = intensity;
+        image[i * 3 + 2] = intensity;
+    }
+}
+
+struct BenchStats
+{
+    double  Time;
+    int     ClearCount;
+    int64_t TriangleCount;
+    int64_t RectTestCount;
+};
+
+BenchStats BenchmarkRecording( FrameRecording & recording, MaskedOcclusionCulling & moc, const int loopCount, const bool includeTests = false )
+{
+    assert( !includeTests ); // not yet implemented
+
+    BenchStats stats; memset( &stats, 0, sizeof(stats ) );
+
+	auto before = std::chrono::high_resolution_clock::now();
+
+    moc.SetNearClipPlane( recording.mNearClipPlane );
+
+    for( int loop = 0; loop < loopCount; loop++ )
+    {
+        // enforce first clear
+        moc.ClearBuffer( );
+        stats.ClearCount++;
+
+        for( int i = 0; i < recording.mPlaybackOrder.size( ); i++ )
+        {
+            char elementType = recording.mPlaybackOrder[i].first;
+            int elementIndex = recording.mPlaybackOrder[i].second;
+            switch( elementType )
+            {
+                case( 0 ):  // RenderTriangles
+                {
+                    const FrameRecording::TrianglesEntry & triangleEntry = recording.mTriangleEntries[elementIndex];
+                    moc.RenderTriangles( triangleEntry.mVertices.data( ), triangleEntry.mTriangles.data( ), (int)triangleEntry.mTriangles.size( ) / 3, ( triangleEntry.mHasModelToClipMatrix ) ? ( triangleEntry.mModelToClipMatrix ) : ( nullptr ), triangleEntry.mbfWinding, triangleEntry.mClipPlaneMask, triangleEntry.mVertexLayout );
+                } break;
+                case( 1 ):  // TestRect
+                {
+                } break;
+                case( 2 ):  // TestTriangles
+                {
+                } break;
+                case( 3 ):  // ClearBuffer
+                {
+                    if( i != 0 )    // skip if first clear because we enforced that anyway
+                    {
+                        moc.ClearBuffer( );
+                        stats.ClearCount++;
+                    }
+                } break;
+                default: assert( false );
+            };
+        }
+    }
+	
+    auto after = std::chrono::high_resolution_clock::now();
+
+    stats.Time = std::chrono::duration<double>( after - before ).count( );
+
+    return stats;
+}
+
+BenchStats BenchmarkRecording( FrameRecording & recording, CullingThreadpool & mocThreadpool, const int loopCount, const bool includeTests = false )
+{
+    assert( !includeTests ); // not yet implemented
+
+    BenchStats stats; memset( &stats, 0, sizeof( stats ) );
+
+    auto before = std::chrono::high_resolution_clock::now( );
+
+    mocThreadpool.SetNearClipPlane( recording.mNearClipPlane );
+
+    for( int loop = 0; loop < loopCount; loop++ )
+    {
+        // enforce first clear
+        mocThreadpool.ClearBuffer( );
+        stats.ClearCount++;
+
+        for( int i = 0; i < recording.mPlaybackOrder.size( ); i++ )
+        {
+            char elementType = recording.mPlaybackOrder[i].first;
+            int elementIndex = recording.mPlaybackOrder[i].second;
+            switch( elementType )
+            {
+                case( 0 ):  // RenderTriangles
+                {
+                    const FrameRecording::TrianglesEntry & triangleEntry = recording.mTriangleEntries[elementIndex];
+                    mocThreadpool.SetMatrix( ( triangleEntry.mHasModelToClipMatrix ) ? ( triangleEntry.mModelToClipMatrix ) : ( nullptr ) );
+                    mocThreadpool.SetVertexLayout( triangleEntry.mVertexLayout );
+                    assert( !triangleEntry.mHasScissorRect );   // can't use scissor rect in multithreaded scenario because it's already used by the binning part of the algorithm
+                    mocThreadpool.RenderTriangles( triangleEntry.mVertices.data( ), triangleEntry.mTriangles.data( ), (int)triangleEntry.mTriangles.size( ) / 3, triangleEntry.mbfWinding );
+                    stats.TriangleCount += triangleEntry.mTriangles.size( );
+                } break;
+                case( 1 ):  // TestRect
+                {
+                } break;
+                case( 2 ):  // TestTriangles
+                {
+                } break;
+                case( 3 ):  // ClearBuffer
+                {
+                    if( i != 0 )    // skip if first clear because we enforced that anyway
+                    {
+                        mocThreadpool.ClearBuffer( );
+                        stats.ClearCount++;
+                    }
+                } break;
+                default: assert( false ); break;
+            };
+        }
+        mocThreadpool.Flush( );
+    }
+
+	auto after = std::chrono::high_resolution_clock::now();
+
+	stats.Time = std::chrono::duration<double>(after - before).count();
+
+    return stats;
+}
+
+
+/*
+double BenchmarkTrianglesD3D(ID3D11Buffer *buf, int numTriangles, bool color)
+{
+	// set the render target as the back buffer
+	if (color)
+		context->OMSetRenderTargets(1, &textureRTV, textureDSV);
+	else
+		context->OMSetRenderTargets(0, nullptr, textureDSV);
+
+	// clear the back buffer to a deep blue
+	float clearColor[4] = { 0.0f, 1.0f, 0.0f, 1.0f };
+	context->ClearRenderTargetView(textureRTV, clearColor);
+	context->ClearDepthStencilView(textureDSV, D3D11_CLEAR_DEPTH, 1.0f, 0);
+
+	// Setup primitivelist
+	UINT stride = sizeof(float) * 4, offset = 0;
+	context->IASetVertexBuffers(0, 1, &buf, &stride, &offset);
+	context->IASetPrimitiveTopology(D3D10_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
+	context->Flush();
+
+	// Draw triangles
+	auto before = std::chrono::high_resolution_clock::now();
+	context->Begin(endQuery);
+	context->Draw(numTriangles * 3, 0);
+	context->End(endQuery);
+	while (context->GetData(endQuery, nullptr, 0, 0) == S_FALSE) {}
+	auto after = std::chrono::high_resolution_clock::now();
+
+	return std::chrono::duration<double>(after - before).count();
+}
+*/
+
+////////////////////////////////////////////////////////////////////////////////////////
+// Perform basic fillrate benchmarks for GPU and compare with this libray
+////////////////////////////////////////////////////////////////////////////////////////
+
+int main(int argc, char* argv[])
+{
+    // settings
+	const int width             = 1920;
+    const int height            = 1080;
+    const float nearClip        = 0.1f;
+    const int benchLoopCount    = 1000;
+
+	// Flush denorms to zero to avoid performance issues with small values
+	_mm_setcsr(_mm_getcsr() | 0x8040);
+
+	MaskedOcclusionCulling *moc = MaskedOcclusionCulling::Create();
+
+	// Initialize directx
+	// InitD3D(width, height);
+
+	// Setup and state related code
+	////////////////////////////////////////////////////////////////////////////////////////
+
+	// Setup a rendertarget and near clip plane 
+	moc->SetResolution(width, height);
+	moc->SetNearClipPlane(nearClip);
+
+    printf( "Masked Occlusion Culling performance tester\n" );
+
+    printf( "Compiler: " );
+#ifdef __clang__
+    printf( "clang/llvm\n" );
+#else
+    printf( "msvc\n" );
+#endif
+
+    printf( "Instruction set: " );
+    if( moc->GetImplementation( ) == MaskedOcclusionCulling::SSE2 )     printf( "SSE2\n" );
+    if( moc->GetImplementation( ) == MaskedOcclusionCulling::SSE41 )    printf( "SSE41\n" );
+    if( moc->GetImplementation( ) == MaskedOcclusionCulling::AVX2 )     printf( "AVX2\n" );
+    if( moc->GetImplementation( ) == MaskedOcclusionCulling::AVX512 )   printf( "AVX512\n" );
+
+    printf( "\nMOC resolution used: %d x %d\n", width, height );
+
+    namespace fs = ::std::experimental::filesystem;
+
+    std::vector< std::pair< std::string, FrameRecording > > recordedFiles;
+    
+    printf( "\nLoading all '*.mocrec' files in the working directory...\n" );
+    for( auto & p : fs::directory_iterator( "./" ) )
+    {
+        if( fs::is_regular_file( p ) && p.path( ).extension( ) == ".mocrec" )
+        {
+            std::string fileName = p.path( ).string( );
+            FrameRecording record;
+            if( FrameRecording::Load( fileName.c_str(), record ) )
+            {
+                recordedFiles.push_back( std::make_pair( fileName, std::move(record) ) );
+                printf( " loaded dataset %d from '%s': OK\n", int(recordedFiles.size()-1), fileName.c_str( ) );
+            }
+            else
+            {
+                printf( " loading of '%s' failed!\n", fileName.c_str() );
+            }
+        }
+    }
+
+    printf( "\nSaving playback screenshots for loaded recording entries\n" );
+    for( int i = 0; i < (int)recordedFiles.size(); i++ ) 
+    {
+        auto & entry = recordedFiles[i];
+        moc->ClearBuffer();
+
+        // Save previously loaded recording entries - useful to keep existing data alive when changing/expanding storage format
+#define RESAVE_ENTRIES 0
+#if RESAVE_ENTRIES != 0
+        moc->RecorderStart( (entry.first).c_str() );
+#endif
+        const FrameRecording & recording = entry.second;
+        moc->SetNearClipPlane(recording.mNearClipPlane);
+        for( int i = 0; i < recording.mPlaybackOrder.size(); i++ )
+        {
+            char elementType = recording.mPlaybackOrder[i].first;
+            int elementIndex = recording.mPlaybackOrder[i].second;
+            switch( elementType )
+            {
+                case( 0 ):  // RenderTriangles
+                {
+                    const FrameRecording::TrianglesEntry & triangleEntry = recording.mTriangleEntries[elementIndex]; 
+                    moc->RenderTriangles( triangleEntry.mVertices.data(), triangleEntry.mTriangles.data(), (int)triangleEntry.mTriangles.size()/3, (triangleEntry.mHasModelToClipMatrix)?(triangleEntry.mModelToClipMatrix):(nullptr), triangleEntry.mbfWinding, triangleEntry.mClipPlaneMask, triangleEntry.mVertexLayout );
+                } break;
+                case( 1 ):  // TestRect
+                {
+                } break;
+                case( 2 ):  // TestTriangles
+                {
+                } break;
+                case( 3 ):  // ClearBuffer
+                {
+                    moc->ClearBuffer( );
+                } break;
+                default: assert( false );
+            }
+        }
+#if RESAVE_ENTRIES != 0
+        moc->RecorderStop();
+#endif
+
+        char fileName[1024]; sprintf_s( fileName, sizeof( fileName ), "%s.bmp", entry.first.c_str() );
+
+        // Compute a per pixel depth buffer from the hierarchical depth buffer, used for visualization.
+        float *perPixelZBuffer = new float[width * height];
+        moc->ComputePixelDepthBuffer( perPixelZBuffer, true );
+
+        // Tonemap the image
+        unsigned char *image = new unsigned char[width * height * 3];
+        TonemapDepth( perPixelZBuffer, image, width, height );
+        WriteBMP( fileName, image, width, height );
+        delete[] image;
+
+        printf( " %d - '%s' written.\n", i, fileName );
+    }
+
+
+	////////////////////////////////////////////////////////////////////////////////////////
+	// Perform benchmarks
+	////////////////////////////////////////////////////////////////////////////////////////
+/*
+	printf("\nD3D Z only\n");
+	printf("----\n");
+	for (int i = 0; i < numSizes; ++i)
+	{
+		int size = sizes[i];
+		double t = BenchmarkTrianglesD3D(vBuffers[i], numTriangles[i], false);
+		double GPixelsPerSecond = (double)numTriangles[i] * size*size / (2.0 * 1e9 * t);
+		double MTrisPerSecond = (double)numTriangles[i] / (1e6 * t);
+		printf("Tri: %3dx%3d - Time: %7.2f ms, MTris/s: %6.2f GPixels/s: %5.2f \n", size, size, t * 1000.0f, MTrisPerSecond, GPixelsPerSecond);
+	}
+    */
+
+    std::vector<double> singleThreadedTimes;
+    singleThreadedTimes.resize( recordedFiles.size() );
+
+	printf("\nSingle threaded benchmark (%d loops of each frame capture)\n", benchLoopCount);
+    for( int i = 0; i < (int)recordedFiles.size( ); i++ )
+    {
+        auto & entry = recordedFiles[i];
+		BenchStats stats = BenchmarkRecording( entry.second, *moc, benchLoopCount );
+
+		float MTrisPerSecond = (float)((double)stats.TriangleCount / (1e6 * stats.Time));
+		printf(" %d - tris: %12" PRId64 ",  MTris/s: %6.2f,  total time: %9.3fms,  single loop time: %6.3fms\n", i, stats.TriangleCount, MTrisPerSecond, float(stats.Time*1000.0f), float(stats.Time*1000.0/double(benchLoopCount)) );
+
+        singleThreadedTimes[i] = stats.Time;
+	}
+    printf( "----\n" );
+
+    int numThreads = std::thread::hardware_concurrency( );
+    printf( "\nMulti threaded benchmark (%d loops of each frame capture, %d threads)\n", benchLoopCount, numThreads );
+    CullingThreadpool ctp( numThreads, 2, numThreads );
+    ctp.SetBuffer( moc );
+    ctp.WakeThreads( );
+    for( int i = 0; i < (int)recordedFiles.size( ); i++ )
+    {
+        auto & entry = recordedFiles[i];
+        BenchStats stats = BenchmarkRecording( entry.second, ctp, benchLoopCount );
+
+        float MTrisPerSecond = (float)( (double)stats.TriangleCount / ( 1e6 * stats.Time ) );
+        printf( " %d - tris: %12" PRId64 ",  MTris/s: %6.2f,  total time: %9.3fms,  single loop time: %6.3fms,  MT scaling: %.3fx\n", i, stats.TriangleCount, MTrisPerSecond, float( stats.Time*1000.0f ), float( stats.Time*1000.0 / double( benchLoopCount ) ), singleThreadedTimes[i] / stats.Time );
+    }
+    ctp.SuspendThreads( );
+    printf( "----\n" );
+}
\ No newline at end of file
diff --git a/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/FrameRecorderPlayer/FrameRecorderPlayer.vcxproj.filters b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/FrameRecorderPlayer/FrameRecorderPlayer.vcxproj.filters
new file mode 100644
index 00000000..14ace5fa
--- /dev/null
+++ b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/FrameRecorderPlayer/FrameRecorderPlayer.vcxproj.filters
@@ -0,0 +1,42 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <ClCompile Include="FrameRecorderPlayer.cpp" />
+    <ClCompile Include="..\CullingThreadpool.cpp">
+      <Filter>MaskedOcclusionCulling</Filter>
+    </ClCompile>
+    <ClCompile Include="..\MaskedOcclusionCulling.cpp">
+      <Filter>MaskedOcclusionCulling</Filter>
+    </ClCompile>
+    <ClCompile Include="..\MaskedOcclusionCullingAVX2.cpp">
+      <Filter>MaskedOcclusionCulling</Filter>
+    </ClCompile>
+    <ClCompile Include="..\MaskedOcclusionCullingAVX512.cpp">
+      <Filter>MaskedOcclusionCulling</Filter>
+    </ClCompile>
+    <ClCompile Include="..\FrameRecorder.cpp">
+      <Filter>MaskedOcclusionCulling</Filter>
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="..\CullingThreadpool.h">
+      <Filter>MaskedOcclusionCulling</Filter>
+    </ClInclude>
+    <ClInclude Include="..\MaskedOcclusionCulling.h">
+      <Filter>MaskedOcclusionCulling</Filter>
+    </ClInclude>
+    <ClInclude Include="..\FrameRecorder.h">
+      <Filter>MaskedOcclusionCulling</Filter>
+    </ClInclude>
+  </ItemGroup>
+  <ItemGroup>
+    <Filter Include="MaskedOcclusionCulling">
+      <UniqueIdentifier>{b848f282-5fc0-4806-b33e-649bedd84f85}</UniqueIdentifier>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="..\MaskedOcclusionCullingCommon.inl">
+      <Filter>MaskedOcclusionCulling</Filter>
+    </None>
+  </ItemGroup>
+</Project>
\ No newline at end of file
diff --git a/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/MaskedOcclusionCulling.cpp b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/MaskedOcclusionCulling.cpp
new file mode 100644
index 00000000..35795893
--- /dev/null
+++ b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/MaskedOcclusionCulling.cpp
@@ -0,0 +1,460 @@
+////////////////////////////////////////////////////////////////////////////////
+// Copyright 2017 Intel Corporation
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License.  You may obtain a copy
+// of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+// License for the specific language governing permissions and limitations
+// under the License.
+////////////////////////////////////////////////////////////////////////////////
+#include <vector>
+#include <string.h>
+#include <assert.h>
+#include <float.h>
+#include "MaskedOcclusionCulling.h"
+#include "CompilerSpecific.inl"
+
+#if MOC_RECORDER_ENABLE
+#include "FrameRecorder.h"
+#endif
+
+#if defined(__AVX__) || defined(__AVX2__)
+	// For performance reasons, the MaskedOcclusionCullingAVX2/512.cpp files should be compiled with VEX encoding for SSE instructions (to avoid 
+	// AVX-SSE transition penalties, see https://software.intel.com/en-us/articles/avoiding-avx-sse-transition-penalties). However, this file
+	// _must_ be compiled without VEX encoding to allow backwards compatibility. Best practice is to use lowest supported target platform 
+	// (/arch:SSE2) as project default, and elevate only the MaskedOcclusionCullingAVX2/512.cpp files.
+	#error The MaskedOcclusionCulling.cpp should be compiled with lowest supported target platform, e.g. /arch:SSE2
+#endif
+
+static MaskedOcclusionCulling::Implementation DetectCPUFeatures(MaskedOcclusionCulling::pfnAlignedAlloc alignedAlloc, MaskedOcclusionCulling::pfnAlignedFree alignedFree)
+{
+	struct CpuInfo { int regs[4]; };
+
+	// Get regular CPUID values
+	int regs[4];
+	__cpuidex(regs, 0, 0);
+
+    //  MOCVectorAllocator<CpuInfo> mocalloc( alignedAlloc, alignedFree );
+    //  std::vector<CpuInfo, MOCVectorAllocator<CpuInfo>> cpuId( mocalloc ), cpuIdEx( mocalloc );
+    //  cpuId.resize( regs[0] );
+    size_t cpuIdCount = regs[0];
+    CpuInfo * cpuId = (CpuInfo*)alignedAlloc( 64, sizeof(CpuInfo) * cpuIdCount );
+    
+	for (size_t i = 0; i < cpuIdCount; ++i)
+		__cpuidex(cpuId[i].regs, (int)i, 0);
+
+	// Get extended CPUID values
+	__cpuidex(regs, 0x80000000, 0);
+
+    //cpuIdEx.resize(regs[0] - 0x80000000);
+    size_t cpuIdExCount = regs[0] - 0x80000000;
+    CpuInfo * cpuIdEx = (CpuInfo*)alignedAlloc( 64, sizeof( CpuInfo ) * cpuIdExCount );
+
+    for (size_t i = 0; i < cpuIdExCount; ++i)
+		__cpuidex(cpuIdEx[i].regs, 0x80000000 + (int)i, 0);
+
+	#define TEST_BITS(A, B)            (((A) & (B)) == (B))
+	#define TEST_FMA_MOVE_OXSAVE       (cpuIdCount >= 1 && TEST_BITS(cpuId[1].regs[2], (1 << 12) | (1 << 22) | (1 << 27)))
+	#define TEST_LZCNT                 (cpuIdExCount >= 1 && TEST_BITS(cpuIdEx[1].regs[2], 0x20))
+	#define TEST_SSE41                 (cpuIdCount >= 1 && TEST_BITS(cpuId[1].regs[2], (1 << 19)))
+	#define TEST_XMM_YMM               (cpuIdCount >= 1 && TEST_BITS(_xgetbv(0), (1 << 2) | (1 << 1)))
+	#define TEST_OPMASK_ZMM            (cpuIdCount >= 1 && TEST_BITS(_xgetbv(0), (1 << 7) | (1 << 6) | (1 << 5)))
+	#define TEST_BMI1_BMI2_AVX2        (cpuIdCount >= 7 && TEST_BITS(cpuId[7].regs[1], (1 << 3) | (1 << 5) | (1 << 8)))
+	#define TEST_AVX512_F_BW_DQ        (cpuIdCount >= 7 && TEST_BITS(cpuId[7].regs[1], (1 << 16) | (1 << 17) | (1 << 30)))
+
+    MaskedOcclusionCulling::Implementation retVal = MaskedOcclusionCulling::SSE2;
+	if (TEST_FMA_MOVE_OXSAVE && TEST_LZCNT && TEST_SSE41)
+	{
+		if (TEST_XMM_YMM && TEST_OPMASK_ZMM && TEST_BMI1_BMI2_AVX2 && TEST_AVX512_F_BW_DQ)
+			retVal = MaskedOcclusionCulling::AVX512;
+		else if (TEST_XMM_YMM && TEST_BMI1_BMI2_AVX2)
+			retVal = MaskedOcclusionCulling::AVX2;
+	} 
+    else if (TEST_SSE41)
+		retVal = MaskedOcclusionCulling::SSE41;
+    alignedFree( cpuId );
+    alignedFree( cpuIdEx );
+    return retVal;
+}
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Utility functions (not directly related to the algorithm/rasterizer)
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+void MaskedOcclusionCulling::TransformVertices(const float *mtx, const float *inVtx, float *xfVtx, unsigned int nVtx, const VertexLayout &vtxLayout)
+{
+	// This function pretty slow, about 10-20% slower than if the vertices are stored in aligned SOA form.
+	if (nVtx == 0)
+		return;
+
+	// Load matrix and swizzle out the z component. For post-multiplication (OGL), the matrix is assumed to be column 
+	// major, with one column per SSE register. For pre-multiplication (DX), the matrix is assumed to be row major.
+	__m128 mtxCol0 = _mm_loadu_ps(mtx);
+	__m128 mtxCol1 = _mm_loadu_ps(mtx + 4);
+	__m128 mtxCol2 = _mm_loadu_ps(mtx + 8);
+	__m128 mtxCol3 = _mm_loadu_ps(mtx + 12);
+
+	int stride = vtxLayout.mStride;
+	const char *vPtr = (const char *)inVtx;
+	float *outPtr = xfVtx;
+
+	// Iterate through all vertices and transform
+	for (unsigned int vtx = 0; vtx < nVtx; ++vtx)
+	{
+		__m128 xVal = _mm_load1_ps((float*)(vPtr));
+		__m128 yVal = _mm_load1_ps((float*)(vPtr + vtxLayout.mOffsetY));
+		__m128 zVal = _mm_load1_ps((float*)(vPtr + vtxLayout.mOffsetZ));
+
+		__m128 xform = _mm_add_ps(_mm_mul_ps(mtxCol0, xVal), _mm_add_ps(_mm_mul_ps(mtxCol1, yVal), _mm_add_ps(_mm_mul_ps(mtxCol2, zVal), mtxCol3)));
+		_mm_storeu_ps(outPtr, xform);
+		vPtr += stride;
+		outPtr += 4;
+	}
+}
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Typedefs
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+typedef MaskedOcclusionCulling::pfnAlignedAlloc pfnAlignedAlloc;
+typedef MaskedOcclusionCulling::pfnAlignedFree  pfnAlignedFree;
+typedef MaskedOcclusionCulling::VertexLayout    VertexLayout;
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Common SSE2/SSE4.1 defines
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+#define SIMD_LANES             4
+#define TILE_HEIGHT_SHIFT      2
+
+#define SIMD_LANE_IDX _mm_setr_epi32(0, 1, 2, 3)
+
+#define SIMD_SUB_TILE_COL_OFFSET _mm_setr_epi32(0, SUB_TILE_WIDTH, SUB_TILE_WIDTH * 2, SUB_TILE_WIDTH * 3)
+#define SIMD_SUB_TILE_ROW_OFFSET _mm_setzero_si128()
+#define SIMD_SUB_TILE_COL_OFFSET_F _mm_setr_ps(0, SUB_TILE_WIDTH, SUB_TILE_WIDTH * 2, SUB_TILE_WIDTH * 3)
+#define SIMD_SUB_TILE_ROW_OFFSET_F _mm_setzero_ps()
+
+#define SIMD_LANE_YCOORD_I _mm_setr_epi32(128, 384, 640, 896)
+#define SIMD_LANE_YCOORD_F _mm_setr_ps(128.0f, 384.0f, 640.0f, 896.0f)
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Common SSE2/SSE4.1 functions
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+typedef __m128 __mw;
+typedef __m128i __mwi;
+
+#define _mmw_set1_ps                _mm_set1_ps
+#define _mmw_setzero_ps             _mm_setzero_ps
+#define _mmw_and_ps                 _mm_and_ps
+#define _mmw_or_ps                  _mm_or_ps
+#define _mmw_xor_ps                 _mm_xor_ps
+#define _mmw_not_ps(a)              _mm_xor_ps((a), _mm_castsi128_ps(_mm_set1_epi32(~0)))
+#define _mmw_andnot_ps              _mm_andnot_ps
+#define _mmw_neg_ps(a)              _mm_xor_ps((a), _mm_set1_ps(-0.0f))
+#define _mmw_abs_ps(a)              _mm_and_ps((a), _mm_castsi128_ps(_mm_set1_epi32(0x7FFFFFFF)))
+#define _mmw_add_ps                 _mm_add_ps
+#define _mmw_sub_ps                 _mm_sub_ps
+#define _mmw_mul_ps                 _mm_mul_ps
+#define _mmw_div_ps                 _mm_div_ps
+#define _mmw_min_ps                 _mm_min_ps
+#define _mmw_max_ps                 _mm_max_ps
+#define _mmw_movemask_ps            _mm_movemask_ps
+#define _mmw_cmpge_ps(a,b)          _mm_cmpge_ps(a, b)
+#define _mmw_cmpgt_ps(a,b)          _mm_cmpgt_ps(a, b)
+#define _mmw_cmpeq_ps(a,b)          _mm_cmpeq_ps(a, b)
+#define _mmw_fmadd_ps(a,b,c)        _mm_add_ps(_mm_mul_ps(a,b), c)
+#define _mmw_fmsub_ps(a,b,c)        _mm_sub_ps(_mm_mul_ps(a,b), c)
+#define _mmw_shuffle_ps             _mm_shuffle_ps
+#define _mmw_insertf32x4_ps(a,b,c)  (b)
+#define _mmw_cvtepi32_ps            _mm_cvtepi32_ps
+#define _mmw_blendv_epi32(a,b,c)    simd_cast<__mwi>(_mmw_blendv_ps(simd_cast<__mw>(a), simd_cast<__mw>(b), simd_cast<__mw>(c)))
+
+#define _mmw_set1_epi32             _mm_set1_epi32
+#define _mmw_setzero_epi32          _mm_setzero_si128
+#define _mmw_and_epi32              _mm_and_si128
+#define _mmw_or_epi32               _mm_or_si128
+#define _mmw_xor_epi32              _mm_xor_si128
+#define _mmw_not_epi32(a)           _mm_xor_si128((a), _mm_set1_epi32(~0))
+#define _mmw_andnot_epi32           _mm_andnot_si128
+#define _mmw_neg_epi32(a)           _mm_sub_epi32(_mm_set1_epi32(0), (a))
+#define _mmw_add_epi32              _mm_add_epi32
+#define _mmw_sub_epi32              _mm_sub_epi32
+#define _mmw_subs_epu16             _mm_subs_epu16
+#define _mmw_cmpeq_epi32            _mm_cmpeq_epi32
+#define _mmw_cmpgt_epi32            _mm_cmpgt_epi32
+#define _mmw_srai_epi32             _mm_srai_epi32
+#define _mmw_srli_epi32             _mm_srli_epi32
+#define _mmw_slli_epi32             _mm_slli_epi32
+#define _mmw_cvtps_epi32            _mm_cvtps_epi32
+#define _mmw_cvttps_epi32           _mm_cvttps_epi32
+
+#define _mmx_fmadd_ps               _mmw_fmadd_ps
+#define _mmx_max_epi32              _mmw_max_epi32
+#define _mmx_min_epi32              _mmw_min_epi32
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// SIMD casting functions
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template<typename T, typename Y> FORCE_INLINE T simd_cast(Y A);
+template<> FORCE_INLINE __m128  simd_cast<__m128>(float A) { return _mm_set1_ps(A); }
+template<> FORCE_INLINE __m128  simd_cast<__m128>(__m128i A) { return _mm_castsi128_ps(A); }
+template<> FORCE_INLINE __m128  simd_cast<__m128>(__m128 A) { return A; }
+template<> FORCE_INLINE __m128i simd_cast<__m128i>(int A) { return _mm_set1_epi32(A); }
+template<> FORCE_INLINE __m128i simd_cast<__m128i>(__m128 A) { return _mm_castps_si128(A); }
+template<> FORCE_INLINE __m128i simd_cast<__m128i>(__m128i A) { return A; }
+
+#define MAKE_ACCESSOR(name, simd_type, base_type, is_const, elements) \
+	FORCE_INLINE is_const base_type * name(is_const simd_type &a) { \
+		union accessor { simd_type m_native; base_type m_array[elements]; }; \
+		is_const accessor *acs = reinterpret_cast<is_const accessor*>(&a); \
+		return acs->m_array; \
+	}
+
+MAKE_ACCESSOR(simd_f32, __m128, float, , 4)
+MAKE_ACCESSOR(simd_f32, __m128, float, const, 4)
+MAKE_ACCESSOR(simd_i32, __m128i, int, , 4)
+MAKE_ACCESSOR(simd_i32, __m128i, int, const, 4)
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Specialized SSE input assembly function for general vertex gather 
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+FORCE_INLINE void GatherVertices(__m128 *vtxX, __m128 *vtxY, __m128 *vtxW, const float *inVtx, const unsigned int *inTrisPtr, int numLanes, const VertexLayout &vtxLayout)
+{
+	for (int lane = 0; lane < numLanes; lane++)
+	{
+		for (int i = 0; i < 3; i++)
+		{
+			char *vPtrX = (char *)inVtx + inTrisPtr[lane * 3 + i] * vtxLayout.mStride;
+			char *vPtrY = vPtrX + vtxLayout.mOffsetY;
+			char *vPtrW = vPtrX + vtxLayout.mOffsetW;
+
+			simd_f32(vtxX[i])[lane] = *((float*)vPtrX);
+			simd_f32(vtxY[i])[lane] = *((float*)vPtrY);
+			simd_f32(vtxW[i])[lane] = *((float*)vPtrW);
+		}
+	}
+}
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// SSE4.1 version
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+namespace MaskedOcclusionCullingSSE41
+{
+	FORCE_INLINE __m128i _mmw_mullo_epi32(const __m128i &a, const __m128i &b) { return _mm_mullo_epi32(a, b); }
+	FORCE_INLINE __m128i _mmw_min_epi32(const __m128i &a, const __m128i &b) { return _mm_min_epi32(a, b); }
+	FORCE_INLINE __m128i _mmw_max_epi32(const __m128i &a, const __m128i &b) { return _mm_max_epi32(a, b); }
+	FORCE_INLINE __m128i _mmw_abs_epi32(const __m128i &a) { return _mm_abs_epi32(a); }
+	FORCE_INLINE __m128 _mmw_blendv_ps(const __m128 &a, const __m128 &b, const __m128 &c) { return _mm_blendv_ps(a, b, c); }
+	FORCE_INLINE int _mmw_testz_epi32(const __m128i &a, const __m128i &b) { return _mm_testz_si128(a, b); }
+	FORCE_INLINE __m128 _mmx_dp4_ps(const __m128 &a, const __m128 &b) { return _mm_dp_ps(a, b, 0xFF); }
+	FORCE_INLINE __m128 _mmw_floor_ps(const __m128 &a) { return _mm_round_ps(a, _MM_FROUND_TO_NEG_INF | _MM_FROUND_NO_EXC); }
+	FORCE_INLINE __m128 _mmw_ceil_ps(const __m128 &a) { return _mm_round_ps(a, _MM_FROUND_TO_POS_INF | _MM_FROUND_NO_EXC);	}
+	FORCE_INLINE __m128i _mmw_transpose_epi8(const __m128i &a)
+	{
+		const __m128i shuff = _mm_setr_epi8(0x0, 0x4, 0x8, 0xC, 0x1, 0x5, 0x9, 0xD, 0x2, 0x6, 0xA, 0xE, 0x3, 0x7, 0xB, 0xF);
+		return _mm_shuffle_epi8(a, shuff);
+	}
+	FORCE_INLINE __m128i _mmw_sllv_ones(const __m128i &ishift)
+	{
+		__m128i shift = _mm_min_epi32(ishift, _mm_set1_epi32(32));
+
+		// Uses lookup tables and _mm_shuffle_epi8 to perform _mm_sllv_epi32(~0, shift)
+		const __m128i byteShiftLUT = _mm_setr_epi8((char)0xFF, (char)0xFE, (char)0xFC, (char)0xF8, (char)0xF0, (char)0xE0, (char)0xC0, (char)0x80, 0, 0, 0, 0, 0, 0, 0, 0);
+		const __m128i byteShiftOffset = _mm_setr_epi8(0, 8, 16, 24, 0, 8, 16, 24, 0, 8, 16, 24, 0, 8, 16, 24);
+		const __m128i byteShiftShuffle = _mm_setr_epi8(0x0, 0x0, 0x0, 0x0, 0x4, 0x4, 0x4, 0x4, 0x8, 0x8, 0x8, 0x8, 0xC, 0xC, 0xC, 0xC);
+
+		__m128i byteShift = _mm_shuffle_epi8(shift, byteShiftShuffle);
+		byteShift = _mm_min_epi8(_mm_subs_epu8(byteShift, byteShiftOffset), _mm_set1_epi8(8));
+		__m128i retMask = _mm_shuffle_epi8(byteShiftLUT, byteShift);
+
+		return retMask;
+	}
+
+	static MaskedOcclusionCulling::Implementation gInstructionSet = MaskedOcclusionCulling::SSE41;
+
+	/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+	// Include common algorithm implementation (general, SIMD independent code)
+	/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+	#include "MaskedOcclusionCullingCommon.inl"
+
+	/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+	// Utility function to create a new object using the allocator callbacks
+	/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+	MaskedOcclusionCulling *CreateMaskedOcclusionCulling(pfnAlignedAlloc alignedAlloc, pfnAlignedFree alignedFree)
+	{
+		MaskedOcclusionCullingPrivate *object = (MaskedOcclusionCullingPrivate *)alignedAlloc(64, sizeof(MaskedOcclusionCullingPrivate));
+		new (object) MaskedOcclusionCullingPrivate(alignedAlloc, alignedFree);
+		return object;
+	}
+};
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// SSE2 version
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+namespace MaskedOcclusionCullingSSE2
+{
+	FORCE_INLINE __m128i _mmw_mullo_epi32(const __m128i &a, const __m128i &b)
+	{ 
+		// Do products for even / odd lanes & merge the result
+		__m128i even = _mm_and_si128(_mm_mul_epu32(a, b), _mm_setr_epi32(~0, 0, ~0, 0));
+		__m128i odd = _mm_slli_epi64(_mm_mul_epu32(_mm_srli_epi64(a, 32), _mm_srli_epi64(b, 32)), 32);
+		return _mm_or_si128(even, odd);
+	}
+	FORCE_INLINE __m128i _mmw_min_epi32(const __m128i &a, const __m128i &b)
+	{ 
+		__m128i cond = _mm_cmpgt_epi32(a, b);
+		return _mm_or_si128(_mm_andnot_si128(cond, a), _mm_and_si128(cond, b));
+	}
+	FORCE_INLINE __m128i _mmw_max_epi32(const __m128i &a, const __m128i &b)
+	{ 
+		__m128i cond = _mm_cmpgt_epi32(b, a);
+		return _mm_or_si128(_mm_andnot_si128(cond, a), _mm_and_si128(cond, b));
+	}
+	FORCE_INLINE __m128i _mmw_abs_epi32(const __m128i &a)
+	{
+		__m128i mask = _mm_cmplt_epi32(a, _mm_setzero_si128());
+		return _mm_add_epi32(_mm_xor_si128(a, mask), _mm_srli_epi32(mask, 31));
+	}
+	FORCE_INLINE int _mmw_testz_epi32(const __m128i &a, const __m128i &b)
+	{ 
+		return _mm_movemask_epi8(_mm_cmpeq_epi8(_mm_and_si128(a, b), _mm_setzero_si128())) == 0xFFFF;
+	}
+	FORCE_INLINE __m128 _mmw_blendv_ps(const __m128 &a, const __m128 &b, const __m128 &c)
+	{	
+		__m128 cond = _mm_castsi128_ps(_mm_srai_epi32(_mm_castps_si128(c), 31));
+		return _mm_or_ps(_mm_andnot_ps(cond, a), _mm_and_ps(cond, b));
+	}
+	FORCE_INLINE __m128 _mmx_dp4_ps(const __m128 &a, const __m128 &b)
+	{ 
+		// Product and two shuffle/adds pairs (similar to hadd_ps)
+		__m128 prod = _mm_mul_ps(a, b);
+		__m128 dp = _mm_add_ps(prod, _mm_shuffle_ps(prod, prod, _MM_SHUFFLE(2, 3, 0, 1)));
+		dp = _mm_add_ps(dp, _mm_shuffle_ps(dp, dp, _MM_SHUFFLE(0, 1, 2, 3)));
+		return dp;
+	}
+	FORCE_INLINE __m128 _mmw_floor_ps(const __m128 &a)
+	{ 
+		int originalMode = _MM_GET_ROUNDING_MODE();
+		_MM_SET_ROUNDING_MODE(_MM_ROUND_DOWN);
+		__m128 rounded = _mm_cvtepi32_ps(_mm_cvtps_epi32(a));
+		_MM_SET_ROUNDING_MODE(originalMode);
+		return rounded;
+	}
+	FORCE_INLINE __m128 _mmw_ceil_ps(const __m128 &a)
+	{ 
+		int originalMode = _MM_GET_ROUNDING_MODE();
+		_MM_SET_ROUNDING_MODE(_MM_ROUND_UP);
+		__m128 rounded = _mm_cvtepi32_ps(_mm_cvtps_epi32(a));
+		_MM_SET_ROUNDING_MODE(originalMode);
+		return rounded;
+	}
+	FORCE_INLINE __m128i _mmw_transpose_epi8(const __m128i &a)
+	{
+		// Perform transpose through two 16->8 bit pack and byte shifts
+		__m128i res = a;
+		const __m128i mask = _mm_setr_epi8(~0, 0, ~0, 0, ~0, 0, ~0, 0, ~0, 0, ~0, 0, ~0, 0, ~0, 0);
+		res = _mm_packus_epi16(_mm_and_si128(res, mask), _mm_srli_epi16(res, 8));
+		res = _mm_packus_epi16(_mm_and_si128(res, mask), _mm_srli_epi16(res, 8));
+		return res;
+	}
+	FORCE_INLINE __m128i _mmw_sllv_ones(const __m128i &ishift)
+	{
+		__m128i shift = _mmw_min_epi32(ishift, _mm_set1_epi32(32));
+		
+		// Uses scalar approach to perform _mm_sllv_epi32(~0, shift)
+		static const unsigned int maskLUT[33] = {
+			~0U << 0, ~0U << 1, ~0U << 2 ,  ~0U << 3, ~0U << 4, ~0U << 5, ~0U << 6 , ~0U << 7, ~0U << 8, ~0U << 9, ~0U << 10 , ~0U << 11, ~0U << 12, ~0U << 13, ~0U << 14 , ~0U << 15,
+			~0U << 16, ~0U << 17, ~0U << 18 , ~0U << 19, ~0U << 20, ~0U << 21, ~0U << 22 , ~0U << 23, ~0U << 24, ~0U << 25, ~0U << 26 , ~0U << 27, ~0U << 28, ~0U << 29, ~0U << 30 , ~0U << 31,
+			0U };
+
+		__m128i retMask;
+		simd_i32(retMask)[0] = (int)maskLUT[simd_i32(shift)[0]];
+		simd_i32(retMask)[1] = (int)maskLUT[simd_i32(shift)[1]];
+		simd_i32(retMask)[2] = (int)maskLUT[simd_i32(shift)[2]];
+		simd_i32(retMask)[3] = (int)maskLUT[simd_i32(shift)[3]];
+		return retMask;
+	}
+
+	static MaskedOcclusionCulling::Implementation gInstructionSet = MaskedOcclusionCulling::SSE2;
+
+	/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+	// Include common algorithm implementation (general, SIMD independent code)
+	/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+	#include "MaskedOcclusionCullingCommon.inl"
+
+	/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+	// Utility function to create a new object using the allocator callbacks
+	/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+	MaskedOcclusionCulling *CreateMaskedOcclusionCulling(pfnAlignedAlloc alignedAlloc, pfnAlignedFree alignedFree)
+	{
+		MaskedOcclusionCullingPrivate *object = (MaskedOcclusionCullingPrivate *)alignedAlloc(64, sizeof(MaskedOcclusionCullingPrivate));
+		new (object) MaskedOcclusionCullingPrivate(alignedAlloc, alignedFree);
+		return object;
+	}
+};
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Object construction and allocation
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+namespace MaskedOcclusionCullingAVX512
+{
+#if USE_AVX512 != 0
+	extern MaskedOcclusionCulling *CreateMaskedOcclusionCulling(pfnAlignedAlloc alignedAlloc, pfnAlignedFree alignedFree);
+#endif
+}
+
+namespace MaskedOcclusionCullingAVX2
+{
+	extern MaskedOcclusionCulling *CreateMaskedOcclusionCulling(pfnAlignedAlloc alignedAlloc, pfnAlignedFree alignedFree);
+}
+
+MaskedOcclusionCulling *MaskedOcclusionCulling::Create(Implementation RequestedSIMD)
+{
+	return Create(RequestedSIMD, aligned_alloc, aligned_free);
+}
+
+MaskedOcclusionCulling *MaskedOcclusionCulling::Create(Implementation RequestedSIMD, pfnAlignedAlloc alignedAlloc, pfnAlignedFree alignedFree)
+{
+	MaskedOcclusionCulling *object = nullptr;
+
+	MaskedOcclusionCulling::Implementation impl = DetectCPUFeatures(alignedAlloc, alignedFree);
+
+	if (RequestedSIMD < impl)
+		impl = RequestedSIMD;
+
+	// Return best supported version
+#if USE_AVX512 != 0
+	if (object == nullptr && impl >= AVX512)
+		object = MaskedOcclusionCullingAVX512::CreateMaskedOcclusionCulling(alignedAlloc, alignedFree); // Use AVX512 version
+#endif
+	if (object == nullptr && impl >= AVX2)
+		object = MaskedOcclusionCullingAVX2::CreateMaskedOcclusionCulling(alignedAlloc, alignedFree); // Use AVX2 version
+	if (object == nullptr && impl >= SSE41)
+		object = MaskedOcclusionCullingSSE41::CreateMaskedOcclusionCulling(alignedAlloc, alignedFree); // Use SSE4.1 version
+	if (object == nullptr)
+		object = MaskedOcclusionCullingSSE2::CreateMaskedOcclusionCulling(alignedAlloc, alignedFree); // Use SSE2 (slow) version
+
+	return object;
+}
+
+void MaskedOcclusionCulling::Destroy(MaskedOcclusionCulling *moc)
+{
+	pfnAlignedFree alignedFreeCallback = moc->mAlignedFreeCallback;
+	moc->~MaskedOcclusionCulling();
+	alignedFreeCallback(moc);
+}
diff --git a/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/MaskedOcclusionCulling.h b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/MaskedOcclusionCulling.h
new file mode 100644
index 00000000..4ace5258
--- /dev/null
+++ b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/MaskedOcclusionCulling.h
@@ -0,0 +1,592 @@
+////////////////////////////////////////////////////////////////////////////////
+// Copyright 2017 Intel Corporation
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License.  You may obtain a copy
+// of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+// License for the specific language governing permissions and limitations
+// under the License.
+////////////////////////////////////////////////////////////////////////////////
+#pragma once
+
+/*!
+ *  \file MaskedOcclusionCulling.h
+ *  \brief Masked Occlusion Culling
+ * 
+ *  General information
+ *   - Input to all API functions are (x,y,w) clip-space coordinates (x positive left, y positive up, w positive away from camera).
+ *     We entirely skip the z component and instead compute it as 1 / w, see next bullet. For TestRect the input is NDC (x/w, y/w).
+ *   - We use a simple z = 1 / w transform, which is a bit faster than OGL/DX depth transforms. Thus, depth is REVERSED and z = 0 at
+ *     the far plane and z = inf at w = 0. We also have to use a GREATER depth function, which explains why all the conservative
+ *     tests will be reversed compared to what you might be used to (for example zMaxTri >= zMinBuffer is a visibility test)
+ *   - We support different layouts for vertex data (basic AoS and SoA), but note that it's beneficial to store the position data
+ *     as tightly in memory as possible to reduce cache misses. Big strides are bad, so it's beneficial to keep position as a separate
+ *     stream (rather than bundled with attributes) or to keep a copy of the position data for the occlusion culling system.
+ *   - The resolution width must be a multiple of 8 and height a multiple of 4.
+ *   - The hierarchical Z buffer is stored OpenGL-style with the y axis pointing up. This includes the scissor box.
+ *   - This code is only tested with Visual Studio 2015, but should hopefully be easy to port to other compilers.
+ */
+
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Defines used to configure the implementation
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+#ifndef QUICK_MASK
+/*!
+ * Configure the algorithm used for updating and merging hierarchical z buffer entries. If QUICK_MASK
+ * is defined to 1, use the algorithm from the paper "Masked Software Occlusion Culling", which has good
+ * balance between performance and low leakage. If QUICK_MASK is defined to 0, use the algorithm from
+ * "Masked Depth Culling for Graphics Hardware" which has less leakage, but also lower performance.
+ */
+#define QUICK_MASK                      1
+
+#endif
+
+#ifndef USE_D3D
+/*!
+ * Configures the library for use with Direct3D (default) or OpenGL rendering. This changes whether the 
+ * screen space Y axis points downwards (D3D) or upwards (OGL), and is primarily important in combination 
+ * with the PRECISE_COVERAGE define, where this is important to ensure correct rounding and tie-breaker
+ * behaviour. It also affects the ScissorRect screen space coordinates.
+ */
+#define USE_D3D                         1
+
+#endif
+
+#ifndef PRECISE_COVERAGE
+/*!
+ * Define PRECISE_COVERAGE to 1 to more closely match GPU rasterization rules. The increased precision comes
+ * at a cost of slightly lower performance.
+ */
+#define PRECISE_COVERAGE                1
+
+#endif
+
+#ifndef USE_AVX512
+/*!
+ * Define USE_AVX512 to 1 to enable experimental AVX-512 support. It's currently mostly untested and only
+ * validated on simple examples using Intel SDE. Older compilers may not support AVX-512 intrinsics.
+ */
+#define USE_AVX512                      0
+
+#endif
+
+#ifndef CLIPPING_PRESERVES_ORDER
+/*!
+ * Define CLIPPING_PRESERVES_ORDER to 1 to prevent clipping from reordering triangle rasterization
+ * order; This comes at a cost (approx 3-4%) but removes one source of temporal frame-to-frame instability.
+ */
+#define CLIPPING_PRESERVES_ORDER        1
+
+#endif
+
+#ifndef ENABLE_STATS
+/*!
+ * Define ENABLE_STATS to 1 to gather various statistics during occlusion culling. Can be used for profiling 
+ * and debugging. Note that enabling this function will reduce performance significantly.
+ */
+#define ENABLE_STATS                    0
+
+#endif
+
+#ifndef MOC_RECORDER_ENABLE
+/*!
+ * Define MOC_RECORDER_ENABLE to 1 to enable frame recorder (see FrameRecorder.h/cpp for details)
+ */
+#define MOC_RECORDER_ENABLE		        0
+
+#endif
+
+#if MOC_RECORDER_ENABLE
+#ifndef MOC_RECORDER_ENABLE_PLAYBACK
+/*!
+ * Define MOC_RECORDER_ENABLE_PLAYBACK to 1 to enable compilation of the playback code (not needed 
+   for recording)
+ */
+#define MOC_RECORDER_ENABLE_PLAYBACK    0
+#endif
+#endif
+
+
+#if MOC_RECORDER_ENABLE
+
+#include <mutex>
+
+class FrameRecorder;
+
+#endif // #if MOC_RECORDER_ENABLE
+
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Masked occlusion culling class
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+class MaskedOcclusionCulling 
+{
+public:
+
+	/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+	// Memory management callback functions
+	/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+	typedef void *(*pfnAlignedAlloc)(size_t alignment, size_t size);
+	typedef void  (*pfnAlignedFree) (void *ptr);
+
+	/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+	// Enums
+	/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+	enum Implementation 
+	{
+		SSE2   = 0,
+		SSE41  = 1,
+		AVX2   = 2,
+		AVX512 = 3
+	};
+
+	enum BackfaceWinding
+	{
+		BACKFACE_NONE = 0,
+		BACKFACE_CW   = 1,
+		BACKFACE_CCW  = 2,
+	};
+
+	enum CullingResult
+	{
+		VISIBLE     = 0x0,
+		OCCLUDED    = 0x1,
+		VIEW_CULLED = 0x3
+	};
+
+	enum ClipPlanes
+	{
+		CLIP_PLANE_NONE   = 0x00,
+		CLIP_PLANE_NEAR   = 0x01,
+		CLIP_PLANE_LEFT   = 0x02,
+		CLIP_PLANE_RIGHT  = 0x04,
+		CLIP_PLANE_BOTTOM = 0x08,
+		CLIP_PLANE_TOP    = 0x10,
+		CLIP_PLANE_SIDES  = (CLIP_PLANE_LEFT | CLIP_PLANE_RIGHT | CLIP_PLANE_BOTTOM | CLIP_PLANE_TOP),
+		CLIP_PLANE_ALL    = (CLIP_PLANE_LEFT | CLIP_PLANE_RIGHT | CLIP_PLANE_BOTTOM | CLIP_PLANE_TOP | CLIP_PLANE_NEAR)
+	};
+
+	/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+	// Structs
+	/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+	/*!
+	 * Used to specify custom vertex layout. Memory offsets to y and z coordinates are set through 
+	 * mOffsetY and mOffsetW, and vertex stride is given by mStride. It's possible to configure both 
+	 * AoS and SoA layouts. Note that large strides may cause more cache misses and decrease 
+	 * performance. It is advisable to store position data as compactly in memory as possible.
+	 */
+	struct VertexLayout
+	{
+		VertexLayout() {}
+		VertexLayout(int stride, int offsetY, int offsetZW) :
+			mStride(stride), mOffsetY(offsetY), mOffsetW(offsetZW) {}
+
+		int mStride;      //!< byte stride between vertices
+		int mOffsetY;     //!< byte offset from X to Y coordinate
+		union {
+			int mOffsetZ; //!< byte offset from X to Z coordinate
+			int mOffsetW; //!< byte offset from X to W coordinate
+		};
+	};
+
+	/*!
+	 * Used to control scissoring during rasterization. Note that we only provide coarse scissor support. 
+	 * The scissor box x coordinates must be a multiple of 32, and the y coordinates a multiple of 8. 
+	 * Scissoring is mainly meant as a means of enabling binning (sort middle) rasterizers in case
+	 * application developers want to use that approach for multithreading.
+	 */
+	struct ScissorRect
+	{
+		ScissorRect() {}
+		ScissorRect(int minX, int minY, int maxX, int maxY) :
+			mMinX(minX), mMinY(minY), mMaxX(maxX), mMaxY(maxY) {}
+
+		int mMinX; //!< Screen space X coordinate for left side of scissor rect, inclusive and must be a multiple of 32
+		int mMinY; //!< Screen space Y coordinate for bottom side of scissor rect, inclusive and must be a multiple of 8
+		int mMaxX; //!< Screen space X coordinate for right side of scissor rect, <B>non</B> inclusive and must be a multiple of 32
+		int mMaxY; //!< Screen space Y coordinate for top side of scissor rect, <B>non</B> inclusive and must be a multiple of 8
+	};
+
+	/*!
+	 * Used to specify storage area for a binlist, containing triangles. This struct is used for binning 
+	 * and multithreading. The host application is responsible for allocating memory for the binlists.
+	 */
+	struct TriList
+	{
+		unsigned int mNumTriangles; //!< Maximum number of triangles that may be stored in mPtr
+		unsigned int mTriIdx;       //!< Index of next triangle to be written, clear before calling BinTriangles to start from the beginning of the list
+		float		 *mPtr;         //!< Scratchpad buffer allocated by the host application
+	};
+
+	/*!
+	 * Statistics that can be gathered during occluder rendering and visibility to aid debugging 
+	 * and profiling. Must be enabled by changing the ENABLE_STATS define.
+	 */
+	struct OcclusionCullingStatistics
+	{
+		struct
+		{
+			long long mNumProcessedTriangles;  //!< Number of occluder triangles processed in total
+			long long mNumRasterizedTriangles; //!< Number of occluder triangles passing view frustum and backface culling
+			long long mNumTilesTraversed;      //!< Number of tiles traversed by the rasterizer
+			long long mNumTilesUpdated;        //!< Number of tiles where the hierarchical z buffer was updated
+			long long mNumTilesMerged;        //!< Number of tiles where the hierarchical z buffer was updated
+		} mOccluders;
+
+		struct
+		{
+			long long mNumProcessedRectangles; //!< Number of rects processed (TestRect())
+			long long mNumProcessedTriangles;  //!< Number of ocludee triangles processed (TestTriangles())
+			long long mNumRasterizedTriangles; //!< Number of ocludee triangle passing view frustum and backface culling
+			long long mNumTilesTraversed;      //!< Number of tiles traversed by triangle & rect rasterizers
+		} mOccludees;
+	};
+
+	/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+	// Functions
+	/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+	/*!
+	 * \brief Creates a new object with default state, no z buffer attached/allocated.
+	 */
+	static MaskedOcclusionCulling *Create(Implementation RequestedSIMD = AVX512);
+	
+	/*!
+	 * \brief Creates a new object with default state, no z buffer attached/allocated.
+	 * \param alignedAlloc Pointer to a callback function used when allocating memory
+	 * \param alignedFree Pointer to a callback function used when freeing memory
+	 */
+	static MaskedOcclusionCulling *Create(Implementation RequestedSIMD, pfnAlignedAlloc alignedAlloc, pfnAlignedFree alignedFree);
+
+	/*!
+	 * \brief Destroys an object and frees the z buffer memory. Note that you cannot 
+	 * use the delete operator, and should rather use this function to free up memory.
+	 */
+	static void Destroy(MaskedOcclusionCulling *moc);
+
+	/*!
+	 * \brief Sets the resolution of the hierarchical depth buffer. This function will
+	 *        re-allocate the current depth buffer (if present). The contents of the
+	 *        buffer is undefined until ClearBuffer() is called.
+	 *
+	 * \param witdh The width of the buffer in pixels, must be a multiple of 8
+	 * \param height The height of the buffer in pixels, must be a multiple of 4
+	 */
+	virtual void SetResolution(unsigned int width, unsigned int height) = 0;
+
+	/*!
+	* \brief Gets the resolution of the hierarchical depth buffer. 
+	*
+	* \param witdh Output: The width of the buffer in pixels
+	* \param height Output: The height of the buffer in pixels
+	*/
+	virtual void GetResolution(unsigned int &width, unsigned int &height) const = 0;
+
+	/*!
+	 * \brief Returns the tile size for the current implementation.
+	 *
+	 * \param nBinsW Number of vertical bins, the screen is divided into nBinsW x nBinsH
+	 *        rectangular bins.
+	 * \param nBinsH Number of horizontal bins, the screen is divided into nBinsW x nBinsH
+	 *        rectangular bins.
+	 * \param outBinWidth Output: The width of the single bin in pixels (except for the 
+	 *        rightmost bin width, which is extended to resolution width)
+	 * \param outBinHeight Output: The height of the single bin in pixels (except for the 
+	 *        bottommost bin height, which is extended to resolution height)
+	 */
+	virtual void ComputeBinWidthHeight(unsigned int nBinsW, unsigned int nBinsH, unsigned int & outBinWidth, unsigned int & outBinHeight) = 0;
+
+	/*!
+	 * \brief Sets the distance for the near clipping plane. Default is nearDist = 0.
+	 *
+	 * \param nearDist The distance to the near clipping plane, given as clip space w
+	 */
+	virtual void SetNearClipPlane(float nearDist) = 0;
+
+	/*!
+	* \brief Gets the distance for the near clipping plane. 
+	*/
+	virtual float GetNearClipPlane() const = 0;
+
+	/*!
+	 * \brief Clears the hierarchical depth buffer.
+	 */
+	virtual void ClearBuffer() = 0;
+
+	/*!
+	* \brief Merge a second hierarchical depth buffer into the main buffer.
+	*/
+	virtual void MergeBuffer(MaskedOcclusionCulling* BufferB) = 0;
+
+	/*! 
+	 * \brief Renders a mesh of occluder triangles and updates the hierarchical z buffer
+	 *        with conservative depth values.
+	 *
+	 * This function is optimized for vertex layouts with stride 16 and y and w
+	 * offsets of 4 and 12 bytes, respectively.
+	 *
+	 * \param inVtx Pointer to an array of input vertices, should point to the x component
+	 *        of the first vertex. The input vertices are given as (x,y,w) coordinates
+	 *        in clip space. The memory layout can be changed using vtxLayout.
+	 * \param inTris Pointer to an array of vertex indices. Each triangle is created 
+	 *        from three indices consecutively fetched from the array.
+	 * \param nTris The number of triangles to render (inTris must contain atleast 3*nTris
+	 *        entries)
+	 * \param modelToClipMatrix all vertices will be transformed by this matrix before
+	 *        performing projection. If nullptr is passed the transform step will be skipped
+	 * \param bfWinding Sets triangle winding order to consider backfacing, must be one one
+	 *        of (BACKFACE_NONE, BACKFACE_CW and BACKFACE_CCW). Back-facing triangles are culled
+	 *        and will not be rasterized. You may use BACKFACE_NONE to disable culling for
+	 *        double sided geometry
+	 * \param clipPlaneMask A mask indicating which clip planes should be considered by the
+	 *        triangle clipper. Can be used as an optimization if your application can 
+	 *        determine (for example during culling) that a group of triangles does not 
+	 *        intersect a certain frustum plane. However, setting an incorrect mask may 
+	 *        cause out of bounds memory accesses.
+	 * \param vtxLayout A struct specifying the vertex layout (see struct for detailed 
+	 *        description). For best performance, it is advisable to store position data
+	 *        as compactly in memory as possible.
+	 * \return Will return VIEW_CULLED if all triangles are either outside the frustum or
+	 *         backface culled, returns VISIBLE otherwise.
+	 */
+	virtual CullingResult RenderTriangles(const float *inVtx, const unsigned int *inTris, int nTris, const float *modelToClipMatrix = nullptr, BackfaceWinding bfWinding = BACKFACE_CW, ClipPlanes clipPlaneMask = CLIP_PLANE_ALL, const VertexLayout &vtxLayout = VertexLayout(16, 4, 12)) = 0;
+
+	/*!
+	 * \brief Occlusion query for a rectangle with a given depth. The rectangle is given 
+	 *        in normalized device coordinates where (x,y) coordinates between [-1,1] map 
+	 *        to the visible screen area. The query uses a GREATER_EQUAL (reversed) depth 
+	 *        test meaning that depth values equal to the contents of the depth buffer are
+	 *        counted as visible.
+	 *
+	 * \param xmin NDC coordinate of the left side of the rectangle.
+	 * \param ymin NDC coordinate of the bottom side of the rectangle.
+	 * \param xmax NDC coordinate of the right side of the rectangle.
+	 * \param ymax NDC coordinate of the top side of the rectangle.
+	 * \param ymax NDC coordinate of the top side of the rectangle.
+	 * \param wmin Clip space W coordinate for the rectangle.
+	 * \return The query will return VISIBLE if the rectangle may be visible, OCCLUDED
+	 *         if the rectangle is occluded by a previously rendered  object, or VIEW_CULLED
+	 *         if the rectangle is outside the view frustum.
+	 */
+	virtual CullingResult TestRect(float xmin, float ymin, float xmax, float ymax, float wmin) const = 0;
+
+	/*!
+	 * \brief This function is similar to RenderTriangles(), but performs an occlusion
+	 *        query instead and does not update the hierarchical z buffer. The query uses 
+	 *        a GREATER_EQUAL (reversed) depth test meaning that depth values equal to the 
+	 *        contents of the depth buffer are counted as visible.
+	 *
+	 * This function is optimized for vertex layouts with stride 16 and y and w
+	 * offsets of 4 and 12 bytes, respectively.
+	 *
+	 * \param inVtx Pointer to an array of input vertices, should point to the x component
+	 *        of the first vertex. The input vertices are given as (x,y,w) coordinates
+	 *        in clip space. The memory layout can be changed using vtxLayout.
+	 * \param inTris Pointer to an array of triangle indices. Each triangle is created 
+	 *        from three indices consecutively fetched from the array.
+	 * \param nTris The number of triangles to render (inTris must contain atleast 3*nTris
+	 *        entries)
+	 * \param modelToClipMatrix all vertices will be transformed by this matrix before
+	 *        performing projection. If nullptr is passed the transform step will be skipped
+	 * \param bfWinding Sets triangle winding order to consider backfacing, must be one one
+	 *        of (BACKFACE_NONE, BACKFACE_CW and BACKFACE_CCW). Back-facing triangles are culled
+	 *        and will not be occlusion tested. You may use BACKFACE_NONE to disable culling
+	 *        for double sided geometry
+	 * \param clipPlaneMask A mask indicating which clip planes should be considered by the
+	 *        triangle clipper. Can be used as an optimization if your application can
+	 *        determine (for example during culling) that a group of triangles does not
+	 *        intersect a certain frustum plane. However, setting an incorrect mask may
+	 *        cause out of bounds memory accesses.
+	 * \param vtxLayout A struct specifying the vertex layout (see struct for detailed 
+	 *        description). For best performance, it is advisable to store position data
+	 *        as compactly in memory as possible.
+	 * \return The query will return VISIBLE if the triangle mesh may be visible, OCCLUDED
+	 *         if the mesh is occluded by a previously rendered object, or VIEW_CULLED if all
+	 *         triangles are entirely outside the view frustum or backface culled.
+	 */
+	virtual CullingResult TestTriangles(const float *inVtx, const unsigned int *inTris, int nTris, const float *modelToClipMatrix = nullptr, BackfaceWinding bfWinding = BACKFACE_CW, ClipPlanes clipPlaneMask = CLIP_PLANE_ALL, const VertexLayout &vtxLayout = VertexLayout(16, 4, 12)) = 0;
+
+	/*!
+	 * \brief Perform input assembly, clipping , projection, triangle setup, and write
+	 *        triangles to the screen space bins they overlap. This function can be used to
+	 *        distribute work for threading (See the CullingThreadpool class for an example)
+	 *
+	 * \param inVtx Pointer to an array of input vertices, should point to the x component
+	 *        of the first vertex. The input vertices are given as (x,y,w) coordinates
+	 *        in clip space. The memory layout can be changed using vtxLayout.
+	 * \param inTris Pointer to an array of vertex indices. Each triangle is created
+	 *        from three indices consecutively fetched from the array.
+	 * \param nTris The number of triangles to render (inTris must contain atleast 3*nTris
+	 *        entries)
+	 * \param triLists Pointer to an array of TriList objects with one TriList object per
+	 *        bin. If a triangle overlaps a bin, it will be written to the corresponding
+	 *        trilist. Note that this method appends the triangles to the current list, to
+	 *        start writing from the beginning of the list, set triList.mTriIdx = 0
+	 * \param nBinsW Number of vertical bins, the screen is divided into nBinsW x nBinsH
+	 *        rectangular bins.
+	 * \param nBinsH Number of horizontal bins, the screen is divided into nBinsW x nBinsH
+	 *        rectangular bins.
+	 * \param modelToClipMatrix all vertices will be transformed by this matrix before
+	 *        performing projection. If nullptr is passed the transform step will be skipped
+	 * \param clipPlaneMask A mask indicating which clip planes should be considered by the
+	 *        triangle clipper. Can be used as an optimization if your application can
+	 *        determine (for example during culling) that a group of triangles does not
+	 *        intersect a certain frustum plane. However, setting an incorrect mask may
+	 *        cause out of bounds memory accesses.
+	 * \param vtxLayout A struct specifying the vertex layout (see struct for detailed
+	 *        description). For best performance, it is advisable to store position data
+	 *        as compactly in memory as possible.
+	 * \param bfWinding Sets triangle winding order to consider backfacing, must be one one
+	 *        of (BACKFACE_NONE, BACKFACE_CW and BACKFACE_CCW). Back-facing triangles are culled
+	 *        and will not be binned / rasterized. You may use BACKFACE_NONE to disable culling
+	 *        for double sided geometry
+	 */
+	virtual void BinTriangles(const float *inVtx, const unsigned int *inTris, int nTris, TriList *triLists, unsigned int nBinsW, unsigned int nBinsH, const float *modelToClipMatrix = nullptr, BackfaceWinding bfWinding = BACKFACE_CW, ClipPlanes clipPlaneMask = CLIP_PLANE_ALL, const VertexLayout &vtxLayout = VertexLayout(16, 4, 12)) = 0;
+
+	/*!
+	 * \brief Renders all occluder triangles in a trilist. This function can be used in
+	 *        combination with BinTriangles() to create a threded (binning) rasterizer. The
+	 *        bins can be processed independently by different threads without risking writing
+	 *        to overlapping memory regions.
+	 *
+	 * \param triLists A triangle list, filled using the BinTriangles() function that is to
+	 *        be rendered.
+	 * \param scissor A scissor box limiting the rendering region to the bin. The size of each
+	 *        bin must be a multiple of 32x8 pixels due to implementation constraints. For a
+	 *        render target with (width, height) resolution and (nBinsW, nBinsH) bins, the
+	 *        size of a bin is:
+	 *          binWidth = (width / nBinsW) - (width / nBinsW) % 32;
+	 *          binHeight = (height / nBinsH) - (height / nBinsH) % 8;
+	 *        The last row and column of tiles have a different size:
+	 *          lastColBinWidth = width - (nBinsW-1)*binWidth;
+	 *          lastRowBinHeight = height - (nBinsH-1)*binHeight;
+	 */
+	virtual void RenderTrilist(const TriList &triList, const ScissorRect *scissor) = 0;
+
+	/*!
+	 * \brief Creates a per-pixel depth buffer from the hierarchical z buffer representation.
+	 *        Intended for visualizing the hierarchical depth buffer for debugging. The 
+	 *        buffer is written in scanline order, from the top to bottom (D3D) or bottom to 
+	 *        top (OGL) of the surface. See the USE_D3D define.
+	 *
+	 * \param depthData Pointer to memory where the per-pixel depth data is written. Must
+	 *        hold storage for atleast width*height elements as set by setResolution.
+	 */
+	virtual void ComputePixelDepthBuffer(float *depthData, bool flipY) = 0;
+	
+	/*!
+	 * \brief Fetch occlusion culling statistics, returns zeroes if ENABLE_STATS define is
+	 *        not defined. The statistics can be used for profiling or debugging.
+	 */
+	virtual OcclusionCullingStatistics GetStatistics() = 0;
+
+	/*!
+	 * \brief Returns the implementation (CPU instruction set) version of this object.
+	 */
+	virtual Implementation GetImplementation() = 0;
+
+	/*!
+	 * \brief Utility function for transforming vertices and outputting them to an (x,y,z,w)
+	 *        format suitable for the occluder rasterization and occludee testing functions.
+	 *
+	 * \param mtx Pointer to matrix data. The matrix should column major for post 
+	 *        multiplication (OGL) and row major for pre-multiplication (DX). This is 
+	 *        consistent with OpenGL / DirectX behavior.
+	 * \param inVtx Pointer to an array of input vertices. The input vertices are given as
+	 *        (x,y,z) coordinates. The memory layout can be changed using vtxLayout.
+	 * \param xfVtx Pointer to an array to store transformed vertices. The transformed
+	 *        vertices are always stored as array of structs (AoS) (x,y,z,w) packed in memory.
+	 * \param nVtx Number of vertices to transform.
+	 * \param vtxLayout A struct specifying the vertex layout (see struct for detailed 
+	 *        description). For best performance, it is advisable to store position data
+	 *        as compactly in memory as possible. Note that for this function, the
+	 *        w-component is assumed to be 1.0.
+	 */
+	static void TransformVertices(const float *mtx, const float *inVtx, float *xfVtx, unsigned int nVtx, const VertexLayout &vtxLayout = VertexLayout(12, 4, 8));
+
+	/*!
+	 * \brief Get used memory alloc/free callbacks.
+     */
+    void GetAllocFreeCallback( pfnAlignedAlloc & allocCallback, pfnAlignedFree & freeCallback ) { allocCallback = mAlignedAllocCallback, freeCallback = mAlignedFreeCallback; }
+
+#if MOC_RECORDER_ENABLE
+    /*!
+	 * \brief Start recording subsequent rasterization and testing calls using the FrameRecorder.
+     *        The function calls that are recorded are:
+     *         - ClearBuffer
+	 *         - RenderTriangles
+     *         - TestTriangles
+     *         - TestRect
+     *        All inputs and outputs are recorded, which can be used for correctness validation
+     *        and performance testing.
+     *
+	 * \param outputFilePath Pointer to name of the output file. 
+	 * \return 'true' if recording was started successfully, 'false' otherwise (file access error).
+	 */
+    bool RecorderStart( const char * outputFilePath ) const;
+
+    /*!
+	 * \brief Stop recording, flush output and release used memory.
+	 */
+    void RecorderStop( ) const;
+
+    /*!
+	 * \brief Manually record triangles. This is called automatically from MaskedOcclusionCulling::RenderTriangles 
+     *  if the recording is started, but not from BinTriangles/RenderTrilist (used in multithreaded codepath), in
+     *  which case it has to be called manually.
+     *
+     * \param inVtx Pointer to an array of input vertices, should point to the x component
+     *        of the first vertex. The input vertices are given as (x,y,w) coordinates
+     *        in clip space. The memory layout can be changed using vtxLayout.
+     * \param inTris Pointer to an array of triangle indices. Each triangle is created
+     *        from three indices consecutively fetched from the array.
+     * \param nTris The number of triangles to render (inTris must contain atleast 3*nTris
+     *        entries)
+     * \param modelToClipMatrix all vertices will be transformed by this matrix before
+     *        performing projection. If nullptr is passed the transform step will be skipped
+     * \param bfWinding Sets triangle winding order to consider backfacing, must be one one
+     *        of (BACKFACE_NONE, BACKFACE_CW and BACKFACE_CCW). Back-facing triangles are culled
+     *        and will not be occlusion tested. You may use BACKFACE_NONE to disable culling
+     *        for double sided geometry
+     * \param clipPlaneMask A mask indicating which clip planes should be considered by the
+     *        triangle clipper. Can be used as an optimization if your application can
+     *        determine (for example during culling) that a group of triangles does not
+     *        intersect a certain frustum plane. However, setting an incorrect mask may
+     *        cause out of bounds memory accesses.
+     * \param vtxLayout A struct specifying the vertex layout (see struct for detailed
+     *        description). For best performance, it is advisable to store position data
+     *        as compactly in memory as possible.
+     * \param cullingResult cull result value expected to be returned by executing the
+     *        RenderTriangles call with recorded parameters.
+	 */
+    // 
+    // merge the binned data back into original layout; in this case, call it manually from your Threadpool implementation (already added to CullingThreadpool).
+    // If recording is not enabled, calling this function will do nothing.
+    void RecordRenderTriangles( const float *inVtx, const unsigned int *inTris, int nTris, const float *modelToClipMatrix = nullptr, ClipPlanes clipPlaneMask = CLIP_PLANE_ALL, BackfaceWinding bfWinding = BACKFACE_CW, const VertexLayout &vtxLayout = VertexLayout( 16, 4, 12 ), CullingResult cullingResult = (CullingResult)-1 );
+#endif // #if MOC_RECORDER_ENABLE
+
+protected:
+	pfnAlignedAlloc mAlignedAllocCallback;
+	pfnAlignedFree  mAlignedFreeCallback;
+
+	mutable OcclusionCullingStatistics mStats;
+
+#if MOC_RECORDER_ENABLE
+    mutable FrameRecorder * mRecorder;
+    mutable std::mutex mRecorderMutex;
+#endif // #if MOC_RECORDER_ENABLE
+
+	virtual ~MaskedOcclusionCulling() {}
+};
diff --git a/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/MaskedOcclusionCullingAVX2.cpp b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/MaskedOcclusionCullingAVX2.cpp
new file mode 100644
index 00000000..b129f129
--- /dev/null
+++ b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/MaskedOcclusionCullingAVX2.cpp
@@ -0,0 +1,243 @@
+////////////////////////////////////////////////////////////////////////////////
+// Copyright 2017 Intel Corporation
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License.  You may obtain a copy
+// of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+// License for the specific language governing permissions and limitations
+// under the License.
+////////////////////////////////////////////////////////////////////////////////
+#include <string.h>
+#include <assert.h>
+#include <float.h>
+#include "MaskedOcclusionCulling.h"
+#include "CompilerSpecific.inl"
+
+#if MOC_RECORDER_ENABLE
+#include "FrameRecorder.h"
+#endif
+
+#if defined(__MICROSOFT_COMPILER) && _MSC_VER < 1900
+	// If you remove/comment this error, the code will compile & use the SSE41 version instead. 
+	#error Older versions than visual studio 2015 not supported due to compiler bug(s)
+#endif
+
+#if !defined(__MICROSOFT_COMPILER) || _MSC_VER >= 1900
+
+// For performance reasons, the MaskedOcclusionCullingAVX2.cpp file should be compiled with VEX encoding for SSE instructions (to avoid 
+// AVX-SSE transition penalties, see https://software.intel.com/en-us/articles/avoiding-avx-sse-transition-penalties). However, the SSE
+// version in MaskedOcclusionCulling.cpp _must_ be compiled without VEX encoding to allow backwards compatibility. Best practice is to 
+// use lowest supported target platform (e.g. /arch:SSE2) as project default, and elevate only the MaskedOcclusionCullingAVX2/512.cpp files.
+#ifndef __AVX2__
+	#error For best performance, MaskedOcclusionCullingAVX2.cpp should be compiled with /arch:AVX2
+#endif
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// AVX specific defines and constants
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+#define SIMD_LANES             8
+#define TILE_HEIGHT_SHIFT      3
+
+#define SIMD_LANE_IDX _mm256_setr_epi32(0, 1, 2, 3, 4, 5, 6, 7)
+
+#define SIMD_SUB_TILE_COL_OFFSET _mm256_setr_epi32(0, SUB_TILE_WIDTH, SUB_TILE_WIDTH * 2, SUB_TILE_WIDTH * 3, 0, SUB_TILE_WIDTH, SUB_TILE_WIDTH * 2, SUB_TILE_WIDTH * 3)
+#define SIMD_SUB_TILE_ROW_OFFSET _mm256_setr_epi32(0, 0, 0, 0, SUB_TILE_HEIGHT, SUB_TILE_HEIGHT, SUB_TILE_HEIGHT, SUB_TILE_HEIGHT)
+#define SIMD_SUB_TILE_COL_OFFSET_F _mm256_setr_ps(0, SUB_TILE_WIDTH, SUB_TILE_WIDTH * 2, SUB_TILE_WIDTH * 3, 0, SUB_TILE_WIDTH, SUB_TILE_WIDTH * 2, SUB_TILE_WIDTH * 3)
+#define SIMD_SUB_TILE_ROW_OFFSET_F _mm256_setr_ps(0, 0, 0, 0, SUB_TILE_HEIGHT, SUB_TILE_HEIGHT, SUB_TILE_HEIGHT, SUB_TILE_HEIGHT)
+
+#define SIMD_SHUFFLE_SCANLINE_TO_SUBTILES _mm256_setr_epi8(0x0, 0x4, 0x8, 0xC, 0x1, 0x5, 0x9, 0xD, 0x2, 0x6, 0xA, 0xE, 0x3, 0x7, 0xB, 0xF, 0x0, 0x4, 0x8, 0xC, 0x1, 0x5, 0x9, 0xD, 0x2, 0x6, 0xA, 0xE, 0x3, 0x7, 0xB, 0xF)
+
+#define SIMD_LANE_YCOORD_I _mm256_setr_epi32(128, 384, 640, 896, 1152, 1408, 1664, 1920)
+#define SIMD_LANE_YCOORD_F _mm256_setr_ps(128.0f, 384.0f, 640.0f, 896.0f, 1152.0f, 1408.0f, 1664.0f, 1920.0f)
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// AVX specific typedefs and functions
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+typedef __m256 __mw;
+typedef __m256i __mwi;
+
+#define _mmw_set1_ps                _mm256_set1_ps
+#define _mmw_setzero_ps             _mm256_setzero_ps
+#define _mmw_and_ps                 _mm256_and_ps
+#define _mmw_or_ps                  _mm256_or_ps
+#define _mmw_xor_ps                 _mm256_xor_ps
+#define _mmw_not_ps(a)              _mm256_xor_ps((a), _mm256_castsi256_ps(_mm256_set1_epi32(~0)))
+#define _mmw_andnot_ps              _mm256_andnot_ps
+#define _mmw_neg_ps(a)              _mm256_xor_ps((a), _mm256_set1_ps(-0.0f))
+#define _mmw_abs_ps(a)              _mm256_and_ps((a), _mm256_castsi256_ps(_mm256_set1_epi32(0x7FFFFFFF)))
+#define _mmw_add_ps                 _mm256_add_ps
+#define _mmw_sub_ps                 _mm256_sub_ps
+#define _mmw_mul_ps                 _mm256_mul_ps
+#define _mmw_div_ps                 _mm256_div_ps
+#define _mmw_min_ps                 _mm256_min_ps
+#define _mmw_max_ps                 _mm256_max_ps
+#define _mmw_fmadd_ps               _mm256_fmadd_ps
+#define _mmw_fmsub_ps               _mm256_fmsub_ps
+#define _mmw_movemask_ps            _mm256_movemask_ps
+#define _mmw_blendv_ps              _mm256_blendv_ps
+#define _mmw_cmpge_ps(a,b)          _mm256_cmp_ps(a, b, _CMP_GE_OQ)
+#define _mmw_cmpgt_ps(a,b)          _mm256_cmp_ps(a, b, _CMP_GT_OQ)
+#define _mmw_cmpeq_ps(a,b)          _mm256_cmp_ps(a, b, _CMP_EQ_OQ)
+#define _mmw_floor_ps(x)            _mm256_round_ps(x, _MM_FROUND_TO_NEG_INF | _MM_FROUND_NO_EXC)
+#define _mmw_ceil_ps(x)             _mm256_round_ps(x, _MM_FROUND_TO_POS_INF | _MM_FROUND_NO_EXC)
+#define _mmw_shuffle_ps             _mm256_shuffle_ps
+#define _mmw_insertf32x4_ps         _mm256_insertf128_ps
+#define _mmw_cvtepi32_ps            _mm256_cvtepi32_ps
+#define _mmw_blendv_epi32(a,b,c)    simd_cast<__mwi>(_mmw_blendv_ps(simd_cast<__mw>(a), simd_cast<__mw>(b), simd_cast<__mw>(c)))
+
+#define _mmw_set1_epi32             _mm256_set1_epi32
+#define _mmw_setzero_epi32          _mm256_setzero_si256
+#define _mmw_and_epi32              _mm256_and_si256
+#define _mmw_or_epi32               _mm256_or_si256
+#define _mmw_xor_epi32              _mm256_xor_si256
+#define _mmw_not_epi32(a)           _mm256_xor_si256((a), _mm256_set1_epi32(~0))
+#define _mmw_andnot_epi32           _mm256_andnot_si256
+#define _mmw_neg_epi32(a)           _mm256_sub_epi32(_mm256_set1_epi32(0), (a))
+#define _mmw_add_epi32              _mm256_add_epi32
+#define _mmw_sub_epi32              _mm256_sub_epi32
+#define _mmw_min_epi32              _mm256_min_epi32
+#define _mmw_max_epi32              _mm256_max_epi32
+#define _mmw_subs_epu16             _mm256_subs_epu16
+#define _mmw_mullo_epi32            _mm256_mullo_epi32
+#define _mmw_cmpeq_epi32            _mm256_cmpeq_epi32
+#define _mmw_testz_epi32            _mm256_testz_si256
+#define _mmw_cmpgt_epi32            _mm256_cmpgt_epi32
+#define _mmw_srai_epi32             _mm256_srai_epi32
+#define _mmw_srli_epi32             _mm256_srli_epi32
+#define _mmw_slli_epi32             _mm256_slli_epi32
+#define _mmw_sllv_ones(x)           _mm256_sllv_epi32(SIMD_BITS_ONE, x)
+#define _mmw_transpose_epi8(x)      _mm256_shuffle_epi8(x, SIMD_SHUFFLE_SCANLINE_TO_SUBTILES)
+#define _mmw_abs_epi32              _mm256_abs_epi32
+#define _mmw_cvtps_epi32            _mm256_cvtps_epi32
+#define _mmw_cvttps_epi32           _mm256_cvttps_epi32
+
+#define _mmx_dp4_ps(a, b)           _mm_dp_ps(a, b, 0xFF)
+#define _mmx_fmadd_ps               _mm_fmadd_ps
+#define _mmx_max_epi32              _mm_max_epi32
+#define _mmx_min_epi32              _mm_min_epi32
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// SIMD casting functions
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template<typename T, typename Y> FORCE_INLINE T simd_cast(Y A);
+template<> FORCE_INLINE __m128  simd_cast<__m128>(float A) { return _mm_set1_ps(A); }
+template<> FORCE_INLINE __m128  simd_cast<__m128>(__m128i A) { return _mm_castsi128_ps(A); }
+template<> FORCE_INLINE __m128  simd_cast<__m128>(__m128 A) { return A; }
+template<> FORCE_INLINE __m128i simd_cast<__m128i>(int A) { return _mm_set1_epi32(A); }
+template<> FORCE_INLINE __m128i simd_cast<__m128i>(__m128 A) { return _mm_castps_si128(A); }
+template<> FORCE_INLINE __m128i simd_cast<__m128i>(__m128i A) { return A; }
+template<> FORCE_INLINE __m256  simd_cast<__m256>(float A) { return _mm256_set1_ps(A); }
+template<> FORCE_INLINE __m256  simd_cast<__m256>(__m256i A) { return _mm256_castsi256_ps(A); }
+template<> FORCE_INLINE __m256  simd_cast<__m256>(__m256 A) { return A; }
+template<> FORCE_INLINE __m256i simd_cast<__m256i>(int A) { return _mm256_set1_epi32(A); }
+template<> FORCE_INLINE __m256i simd_cast<__m256i>(__m256 A) { return _mm256_castps_si256(A); }
+template<> FORCE_INLINE __m256i simd_cast<__m256i>(__m256i A) { return A; }
+
+#define MAKE_ACCESSOR(name, simd_type, base_type, is_const, elements) \
+	FORCE_INLINE is_const base_type * name(is_const simd_type &a) { \
+		union accessor { simd_type m_native; base_type m_array[elements]; }; \
+		is_const accessor *acs = reinterpret_cast<is_const accessor*>(&a); \
+		return acs->m_array; \
+	}
+
+MAKE_ACCESSOR(simd_f32, __m128, float, , 4)
+MAKE_ACCESSOR(simd_f32, __m128, float, const, 4)
+MAKE_ACCESSOR(simd_i32, __m128i, int, , 4)
+MAKE_ACCESSOR(simd_i32, __m128i, int, const, 4)
+
+MAKE_ACCESSOR(simd_f32, __m256, float, , 8)
+MAKE_ACCESSOR(simd_f32, __m256, float, const, 8)
+MAKE_ACCESSOR(simd_i32, __m256i, int, , 8)
+MAKE_ACCESSOR(simd_i32, __m256i, int, const, 8)
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Specialized AVX input assembly function for general vertex gather 
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+typedef MaskedOcclusionCulling::VertexLayout VertexLayout;
+
+FORCE_INLINE void GatherVertices(__m256 *vtxX, __m256 *vtxY, __m256 *vtxW, const float *inVtx, const unsigned int *inTrisPtr, int numLanes, const VertexLayout &vtxLayout)
+{
+	assert(numLanes >= 1);
+
+	const __m256i SIMD_TRI_IDX_OFFSET = _mm256_setr_epi32(0, 3, 6, 9, 12, 15, 18, 21);
+	static const __m256i SIMD_LANE_MASK[9] = {
+		_mm256_setr_epi32( 0,  0,  0,  0,  0,  0,  0,  0),
+		_mm256_setr_epi32(~0,  0,  0,  0,  0,  0,  0,  0),
+		_mm256_setr_epi32(~0, ~0,  0,  0,  0,  0,  0,  0),
+		_mm256_setr_epi32(~0, ~0, ~0,  0,  0,  0,  0,  0),
+		_mm256_setr_epi32(~0, ~0, ~0, ~0,  0,  0,  0,  0),
+		_mm256_setr_epi32(~0, ~0, ~0, ~0, ~0,  0,  0,  0),
+		_mm256_setr_epi32(~0, ~0, ~0, ~0, ~0, ~0,  0,  0),
+		_mm256_setr_epi32(~0, ~0, ~0, ~0, ~0, ~0, ~0,  0),
+		_mm256_setr_epi32(~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0)
+	};
+
+	// Compute per-lane index list offset that guards against out of bounds memory accesses
+	__m256i safeTriIdxOffset = _mm256_and_si256(SIMD_TRI_IDX_OFFSET, SIMD_LANE_MASK[numLanes]);
+
+	// Fetch triangle indices. 
+	__m256i vtxIdx[3];
+	vtxIdx[0] = _mmw_mullo_epi32(_mm256_i32gather_epi32((const int*)inTrisPtr + 0, safeTriIdxOffset, 4), _mmw_set1_epi32(vtxLayout.mStride));
+	vtxIdx[1] = _mmw_mullo_epi32(_mm256_i32gather_epi32((const int*)inTrisPtr + 1, safeTriIdxOffset, 4), _mmw_set1_epi32(vtxLayout.mStride));
+	vtxIdx[2] = _mmw_mullo_epi32(_mm256_i32gather_epi32((const int*)inTrisPtr + 2, safeTriIdxOffset, 4), _mmw_set1_epi32(vtxLayout.mStride));
+
+	char *vPtr = (char *)inVtx;
+
+	// Fetch triangle vertices
+	for (int i = 0; i < 3; i++)
+	{
+		vtxX[i] = _mm256_i32gather_ps((float *)vPtr, vtxIdx[i], 1);
+		vtxY[i] = _mm256_i32gather_ps((float *)(vPtr + vtxLayout.mOffsetY), vtxIdx[i], 1);
+		vtxW[i] = _mm256_i32gather_ps((float *)(vPtr + vtxLayout.mOffsetW), vtxIdx[i], 1);
+	}
+}
+
+namespace MaskedOcclusionCullingAVX2
+{
+	static MaskedOcclusionCulling::Implementation gInstructionSet = MaskedOcclusionCulling::AVX2;
+
+	/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+	// Include common algorithm implementation (general, SIMD independent code)
+	/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+	#include "MaskedOcclusionCullingCommon.inl"
+
+	/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+	// Utility function to create a new object using the allocator callbacks
+	/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+	
+	typedef MaskedOcclusionCulling::pfnAlignedAlloc            pfnAlignedAlloc;
+	typedef MaskedOcclusionCulling::pfnAlignedFree             pfnAlignedFree;
+
+	MaskedOcclusionCulling *CreateMaskedOcclusionCulling(pfnAlignedAlloc alignedAlloc, pfnAlignedFree alignedFree)
+	{
+		MaskedOcclusionCullingPrivate *object = (MaskedOcclusionCullingPrivate *)alignedAlloc(64, sizeof(MaskedOcclusionCullingPrivate));
+		new (object) MaskedOcclusionCullingPrivate(alignedAlloc, alignedFree);
+		return object;
+	}
+};
+
+#else
+
+namespace MaskedOcclusionCullingAVX2
+{
+	typedef MaskedOcclusionCulling::pfnAlignedAlloc            pfnAlignedAlloc;
+	typedef MaskedOcclusionCulling::pfnAlignedFree             pfnAlignedFree;
+
+	MaskedOcclusionCulling *CreateMaskedOcclusionCulling(pfnAlignedAlloc alignedAlloc, pfnAlignedFree alignedFree)
+	{
+		return nullptr;
+	}
+};
+
+#endif
diff --git a/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/MaskedOcclusionCullingAVX512.cpp b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/MaskedOcclusionCullingAVX512.cpp
new file mode 100644
index 00000000..1dccccd8
--- /dev/null
+++ b/neo/engine/opengl/thirdparty/MaskedOcclusionCulling/MaskedOcclusionCullingAVX512.cpp
@@ -0,0 +1,309 @@
+////////////////////////////////////////////////////////////////////////////////
+// Copyright 2017 Intel Corporation
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License.  You may obtain a copy
+// of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+// License for the specific language governing permissions and limitations
+// under the License.
+////////////////////////////////////////////////////////////////////////////////
+#include <string.h>
+#include <assert.h>
+#include <float.h>
+#include "MaskedOcclusionCulling.h"
+#include "CompilerSpecific.inl"
+
+#if MOC_RECORDER_ENABLE
+#include "FrameRecorder.h"
+#endif
+
+// Make sure compiler supports AVX-512 intrinsics: Visual Studio 2017 (Update 3) || Intel C++ Compiler 16.0 || Clang 4.0 || GCC 5.0
+#if USE_AVX512 != 0 && ((defined(_MSC_VER) && _MSC_VER >= 1911) || (defined(__INTEL_COMPILER) && __INTEL_COMPILER >= 1600) || (defined(__clang__) && __clang_major__ >= 4) || (defined(__GNUC__) && __GNUC__ >= 5))
+
+// The MaskedOcclusionCullingAVX512.cpp file should be compiled avx2/avx512 architecture options turned on in the compiler. However, the SSE
+// version in MaskedOcclusionCulling.cpp _must_ be compiled with SSE2 architecture allow backwards compatibility. Best practice is to 
+// use lowest supported target platform (e.g. /arch:SSE2) as project default, and elevate only the MaskedOcclusionCullingAVX2/512.cpp files.
+#ifndef __AVX2__
+	#error For best performance, MaskedOcclusionCullingAVX512.cpp should be compiled with /arch:AVX2
+#endif
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// AVX specific defines and constants
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+#define SIMD_LANES             16
+#define TILE_HEIGHT_SHIFT      4
+
+#define SIMD_LANE_IDX _mm512_setr_epi32(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
+
+#define SIMD_SUB_TILE_COL_OFFSET _mm512_setr_epi32(0, SUB_TILE_WIDTH, SUB_TILE_WIDTH * 2, SUB_TILE_WIDTH * 3, 0, SUB_TILE_WIDTH, SUB_TILE_WIDTH * 2, SUB_TILE_WIDTH * 3, 0, SUB_TILE_WIDTH, SUB_TILE_WIDTH * 2, SUB_TILE_WIDTH * 3, 0, SUB_TILE_WIDTH, SUB_TILE_WIDTH * 2, SUB_TILE_WIDTH * 3)
+#define SIMD_SUB_TILE_ROW_OFFSET _mm512_setr_epi32(0, 0, 0, 0, SUB_TILE_HEIGHT, SUB_TILE_HEIGHT, SUB_TILE_HEIGHT, SUB_TILE_HEIGHT, SUB_TILE_HEIGHT * 2, SUB_TILE_HEIGHT * 2, SUB_TILE_HEIGHT * 2, SUB_TILE_HEIGHT * 2, SUB_TILE_HEIGHT * 3, SUB_TILE_HEIGHT * 3, SUB_TILE_HEIGHT * 3, SUB_TILE_HEIGHT * 3)
+#define SIMD_SUB_TILE_COL_OFFSET_F _mm512_setr_ps(0, SUB_TILE_WIDTH, SUB_TILE_WIDTH * 2, SUB_TILE_WIDTH * 3, 0, SUB_TILE_WIDTH, SUB_TILE_WIDTH * 2, SUB_TILE_WIDTH * 3, 0, SUB_TILE_WIDTH, SUB_TILE_WIDTH * 2, SUB_TILE_WIDTH * 3, 0, SUB_TILE_WIDTH, SUB_TILE_WIDTH * 2, SUB_TILE_WIDTH * 3)
+#define SIMD_SUB_TILE_ROW_OFFSET_F _mm512_setr_ps(0, 0, 0, 0, SUB_TILE_HEIGHT, SUB_TILE_HEIGHT, SUB_TILE_HEIGHT, SUB_TILE_HEIGHT, SUB_TILE_HEIGHT * 2, SUB_TILE_HEIGHT * 2, SUB_TILE_HEIGHT * 2, SUB_TILE_HEIGHT * 2, SUB_TILE_HEIGHT * 3, SUB_TILE_HEIGHT * 3, SUB_TILE_HEIGHT * 3, SUB_TILE_HEIGHT * 3)
+
+#define SIMD_SHUFFLE_SCANLINE_TO_SUBTILES _mm512_set_epi32(0x0F0B0703, 0x0E0A0602, 0x0D090501, 0x0C080400, 0x0F0B0703, 0x0E0A0602, 0x0D090501, 0x0C080400, 0x0F0B0703, 0x0E0A0602, 0x0D090501, 0x0C080400, 0x0F0B0703, 0x0E0A0602, 0x0D090501, 0x0C080400)
+
+#define SIMD_LANE_YCOORD_I _mm512_setr_epi32(128, 384, 640, 896, 1152, 1408, 1664, 1920, 2176, 2432, 2688, 2944, 3200, 3456, 3712, 3968)
+#define SIMD_LANE_YCOORD_F _mm512_setr_ps(128.0f, 384.0f, 640.0f, 896.0f, 1152.0f, 1408.0f, 1664.0f, 1920.0f, 2176.0f, 2432.0f, 2688.0f, 2944.0f, 3200.0f, 3456.0f, 3712.0f, 3968.0f)
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// AVX specific typedefs and functions
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+typedef __m512 __mw;
+typedef __m512i __mwi;
+
+#define _mmw_set1_ps                _mm512_set1_ps
+#define _mmw_setzero_ps             _mm512_setzero_ps
+#define _mmw_and_ps                 _mm512_and_ps
+#define _mmw_or_ps                  _mm512_or_ps
+#define _mmw_xor_ps                 _mm512_xor_ps
+#define _mmw_not_ps(a)              _mm512_xor_ps((a), _mm512_castsi512_ps(_mm512_set1_epi32(~0)))
+#define _mmw_andnot_ps              _mm512_andnot_ps
+#define _mmw_neg_ps(a)              _mm512_xor_ps((a), _mm512_set1_ps(-0.0f))
+#define _mmw_abs_ps(a)              _mm512_and_ps((a), _mm512_castsi512_ps(_mm512_set1_epi32(0x7FFFFFFF)))
+#define _mmw_add_ps                 _mm512_add_ps
+#define _mmw_sub_ps                 _mm512_sub_ps
+#define _mmw_mul_ps                 _mm512_mul_ps
+#define _mmw_div_ps                 _mm512_div_ps
+#define _mmw_min_ps                 _mm512_min_ps
+#define _mmw_max_ps                 _mm512_max_ps
+#define _mmw_fmadd_ps               _mm512_fmadd_ps
+#define _mmw_fmsub_ps               _mm512_fmsub_ps
+#define _mmw_shuffle_ps             _mm512_shuffle_ps
+#define _mmw_insertf32x4_ps         _mm512_insertf32x4
+#define _mmw_cvtepi32_ps            _mm512_cvtepi32_ps
+#define _mmw_blendv_epi32(a,b,c)    simd_cast<__mwi>(_mmw_blendv_ps(simd_cast<__mw>(a), simd_cast<__mw>(b), simd_cast<__mw>(c)))
+
+#define _mmw_set1_epi32             _mm512_set1_epi32
+#define _mmw_setzero_epi32          _mm512_setzero_si512
+#define _mmw_and_epi32              _mm512_and_si512
+#define _mmw_or_epi32               _mm512_or_si512
+#define _mmw_xor_epi32              _mm512_xor_si512
+#define _mmw_not_epi32(a)           _mm512_xor_si512((a), _mm512_set1_epi32(~0))
+#define _mmw_andnot_epi32           _mm512_andnot_si512
+#define _mmw_neg_epi32(a)           _mm512_sub_epi32(_mm512_set1_epi32(0), (a))
+#define _mmw_add_epi32              _mm512_add_epi32
+#define _mmw_sub_epi32              _mm512_sub_epi32
+#define _mmw_min_epi32              _mm512_min_epi32
+#define _mmw_max_epi32              _mm512_max_epi32
+#define _mmw_subs_epu16             _mm512_subs_epu16
+#define _mmw_mullo_epi32            _mm512_mullo_epi32
+#define _mmw_srai_epi32             _mm512_srai_epi32
+#define _mmw_srli_epi32             _mm512_srli_epi32
+#define _mmw_slli_epi32             _mm512_slli_epi32
+#define _mmw_sllv_ones(x)           _mm512_sllv_epi32(SIMD_BITS_ONE, x)
+#define _mmw_transpose_epi8(x)      _mm512_shuffle_epi8(x, SIMD_SHUFFLE_SCANLINE_TO_SUBTILES)
+#define _mmw_abs_epi32              _mm512_abs_epi32
+#define _mmw_cvtps_epi32            _mm512_cvtps_epi32
+#define _mmw_cvttps_epi32           _mm512_cvttps_epi32
+
+#define _mmx_dp4_ps(a, b)           _mm_dp_ps(a, b, 0xFF)
+#define _mmx_fmadd_ps               _mm_fmadd_ps
+#define _mmx_max_epi32              _mm_max_epi32
+#define _mmx_min_epi32              _mm_min_epi32
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// SIMD casting functions
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+template<typename T, typename Y> FORCE_INLINE T simd_cast(Y A);
+template<> FORCE_INLINE __m128  simd_cast<__m128>(float A) { return _mm_set1_ps(A); }
+template<> FORCE_INLINE __m128  simd_cast<__m128>(__m128i A) { return _mm_castsi128_ps(A); }
+template<> FORCE_INLINE __m128  simd_cast<__m128>(__m128 A) { return A; }
+template<> FORCE_INLINE __m128i simd_cast<__m128i>(int A) { return _mm_set1_epi32(A); }
+template<> FORCE_INLINE __m128i simd_cast<__m128i>(__m128 A) { return _mm_castps_si128(A); }
+template<> FORCE_INLINE __m128i simd_cast<__m128i>(__m128i A) { return A; }
+template<> FORCE_INLINE __m256  simd_cast<__m256>(float A) { return _mm256_set1_ps(A); }
+template<> FORCE_INLINE __m256  simd_cast<__m256>(__m256i A) { return _mm256_castsi256_ps(A); }
+template<> FORCE_INLINE __m256  simd_cast<__m256>(__m256 A) { return A; }
+template<> FORCE_INLINE __m256i simd_cast<__m256i>(int A) { return _mm256_set1_epi32(A); }
+template<> FORCE_INLINE __m256i simd_cast<__m256i>(__m256 A) { return _mm256_castps_si256(A); }
+template<> FORCE_INLINE __m256i simd_cast<__m256i>(__m256i A) { return A; }
+template<> FORCE_INLINE __m512  simd_cast<__m512>(float A) { return _mm512_set1_ps(A); }
+template<> FORCE_INLINE __m512  simd_cast<__m512>(__m512i A) { return _mm512_castsi512_ps(A); }
+template<> FORCE_INLINE __m512  simd_cast<__m512>(__m512 A) { return A; }
+template<> FORCE_INLINE __m512i simd_cast<__m512i>(int A) { return _mm512_set1_epi32(A); }
+template<> FORCE_INLINE __m512i simd_cast<__m512i>(__m512 A) { return _mm512_castps_si512(A); }
+template<> FORCE_INLINE __m512i simd_cast<__m512i>(__m512i A) { return A; }
+
+#define MAKE_ACCESSOR(name, simd_type, base_type, is_const, elements) \
+	FORCE_INLINE is_const base_type * name(is_const simd_type &a) { \
+		union accessor { simd_type m_native; base_type m_array[elements]; }; \
+		is_const accessor *acs = reinterpret_cast<is_const accessor*>(&a); \
+		return acs->m_array; \
+	}
+
+MAKE_ACCESSOR(simd_f32, __m128, float, , 4)
+MAKE_ACCESSOR(simd_f32, __m128, float, const, 4)
+MAKE_ACCESSOR(simd_i32, __m128i, int, , 4)
+MAKE_ACCESSOR(simd_i32, __m128i, int, const, 4)
+
+MAKE_ACCESSOR(simd_f32, __m256, float, , 8)
+MAKE_ACCESSOR(simd_f32, __m256, float, const, 8)
+MAKE_ACCESSOR(simd_i32, __m256i, int, , 8)
+MAKE_ACCESSOR(simd_i32, __m256i, int, const, 8)
+
+MAKE_ACCESSOR(simd_f32, __m512, float, , 16)
+MAKE_ACCESSOR(simd_f32, __m512, float, const, 16)
+MAKE_ACCESSOR(simd_i32, __m512i, int, , 16)
+MAKE_ACCESSOR(simd_i32, __m512i, int, const, 16)
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// Specialized AVX input assembly function for general vertex gather 
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+typedef MaskedOcclusionCulling::VertexLayout VertexLayout;
+
+FORCE_INLINE void GatherVertices(__m512 *vtxX, __m512 *vtxY, __m512 *vtxW, const float *inVtx, const unsigned int *inTrisPtr, int numLanes, const VertexLayout &vtxLayout)
+{
+	assert(numLanes >= 1);
+
+	const __m512i SIMD_TRI_IDX_OFFSET = _mm512_setr_epi32(0, 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45);
+	static const __m512i SIMD_LANE_MASK[17] = {
+		_mm512_setr_epi32( 0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0),
+		_mm512_setr_epi32(~0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0),
+		_mm512_setr_epi32(~0, ~0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0),
+		_mm512_setr_epi32(~0, ~0, ~0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0),
+		_mm512_setr_epi32(~0, ~0, ~0, ~0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0),
+		_mm512_setr_epi32(~0, ~0, ~0, ~0, ~0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0),
+		_mm512_setr_epi32(~0, ~0, ~0, ~0, ~0, ~0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0),
+		_mm512_setr_epi32(~0, ~0, ~0, ~0, ~0, ~0, ~0,  0,  0,  0,  0,  0,  0,  0,  0,  0),
+		_mm512_setr_epi32(~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0,  0,  0,  0,  0,  0,  0,  0,  0),
+		_mm512_setr_epi32(~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0,  0,  0,  0,  0,  0,  0,  0),
+		_mm512_setr_epi32(~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0,  0,  0,  0,  0,  0,  0),
+		_mm512_setr_epi32(~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0,  0,  0,  0,  0,  0),
+		_mm512_setr_epi32(~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0,  0,  0,  0,  0),
+		_mm512_setr_epi32(~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0,  0,  0,  0),
+		_mm512_setr_epi32(~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0,  0,  0),
+		_mm512_setr_epi32(~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0,  0),
+		_mm512_setr_epi32(~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0, ~0)
+	};
+
+	// Compute per-lane index list offset that guards against out of bounds memory accesses
+	__m512i safeTriIdxOffset = _mm512_and_si512(SIMD_TRI_IDX_OFFSET, SIMD_LANE_MASK[numLanes]);
+
+	// Fetch triangle indices. 
+	__m512i vtxIdx[3];
+	vtxIdx[0] = _mmw_mullo_epi32(_mm512_i32gather_epi32(safeTriIdxOffset, (const int*)inTrisPtr + 0, 4), _mmw_set1_epi32(vtxLayout.mStride));
+	vtxIdx[1] = _mmw_mullo_epi32(_mm512_i32gather_epi32(safeTriIdxOffset, (const int*)inTrisPtr + 1, 4), _mmw_set1_epi32(vtxLayout.mStride));
+	vtxIdx[2] = _mmw_mullo_epi32(_mm512_i32gather_epi32(safeTriIdxOffset, (const int*)inTrisPtr + 2, 4), _mmw_set1_epi32(vtxLayout.mStride));
+
+	char *vPtr = (char *)inVtx;
+
+	// Fetch triangle vertices
+	for (int i = 0; i < 3; i++)
+	{
+		vtxX[i] = _mm512_i32gather_ps(vtxIdx[i], (float *)vPtr, 1);
+		vtxY[i] = _mm512_i32gather_ps(vtxIdx[i], (float *)(vPtr + vtxLayout.mOffsetY), 1);
+		vtxW[i] = _mm512_i32gather_ps(vtxIdx[i], (float *)(vPtr + vtxLayout.mOffsetW), 1);
+	}
+}
+
+namespace MaskedOcclusionCullingAVX512
+{
+	/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+	// Poorly implemented functions. TODO: fix common (maskedOcclusionCullingCommon.inl) code to improve perf
+	/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+	FORCE_INLINE __m512 _mmw_floor_ps(__m512 x)
+	{
+		return _mm512_roundscale_ps(x, 1); // 1 = floor
+	}
+
+	FORCE_INLINE __m512 _mmw_ceil_ps(__m512 x)
+	{
+		return _mm512_roundscale_ps(x, 2); // 2 = ceil
+	}
+
+	FORCE_INLINE __m512i _mmw_cmpeq_epi32(__m512i a, __m512i b)
+	{
+		__mmask16 mask = _mm512_cmpeq_epi32_mask(a, b);
+		return _mm512_mask_mov_epi32(_mm512_set1_epi32(0), mask, _mm512_set1_epi32(~0));
+	}
+
+	FORCE_INLINE __m512i _mmw_cmpgt_epi32(__m512i a, __m512i b)
+	{
+		__mmask16 mask = _mm512_cmpgt_epi32_mask(a, b);
+		return _mm512_mask_mov_epi32(_mm512_set1_epi32(0), mask, _mm512_set1_epi32(~0));
+	}
+
+	FORCE_INLINE bool _mmw_testz_epi32(__m512i a, __m512i b)
+	{
+		__mmask16 mask = _mm512_cmpeq_epi32_mask(_mm512_and_si512(a, b), _mm512_set1_epi32(0));
+		return mask == 0xFFFF;
+	}
+
+	FORCE_INLINE __m512 _mmw_cmpge_ps(__m512 a, __m512 b)
+	{
+		__mmask16 mask = _mm512_cmp_ps_mask(a, b, _CMP_GE_OQ);
+		return _mm512_castsi512_ps(_mm512_mask_mov_epi32(_mm512_set1_epi32(0), mask, _mm512_set1_epi32(~0)));
+	}
+
+	FORCE_INLINE __m512 _mmw_cmpgt_ps(__m512 a, __m512 b)
+	{
+		__mmask16 mask = _mm512_cmp_ps_mask(a, b, _CMP_GT_OQ);
+		return _mm512_castsi512_ps(_mm512_mask_mov_epi32(_mm512_set1_epi32(0), mask, _mm512_set1_epi32(~0)));
+	}
+
+	FORCE_INLINE __m512 _mmw_cmpeq_ps(__m512 a, __m512 b)
+	{
+		__mmask16 mask = _mm512_cmp_ps_mask(a, b, _CMP_EQ_OQ);
+		return _mm512_castsi512_ps(_mm512_mask_mov_epi32(_mm512_set1_epi32(0), mask, _mm512_set1_epi32(~0)));
+	}
+
+	FORCE_INLINE __mmask16 _mmw_movemask_ps(const __m512 &a)
+	{
+		__mmask16 mask = _mm512_cmp_epi32_mask(_mm512_and_si512(_mm512_castps_si512(a), _mm512_set1_epi32(0x80000000)), _mm512_set1_epi32(0), 4);	// a & 0x8000000 != 0
+		return mask;
+	}
+
+	FORCE_INLINE __m512 _mmw_blendv_ps(const __m512 &a, const __m512 &b, const __m512 &c)
+	{
+		__mmask16 mask = _mmw_movemask_ps(c);
+		return _mm512_mask_mov_ps(a, mask, b);
+	} 
+
+	static MaskedOcclusionCulling::Implementation gInstructionSet = MaskedOcclusionCulling::AVX512;
+
+	/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+	// Include common algorithm implementation (general, SIMD independent code)
+	/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+	#include "MaskedOcclusionCullingCommon.inl"
+
+	/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+	// Utility function to create a new object using the allocator callbacks
+	/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+	
+	typedef MaskedOcclusionCulling::pfnAlignedAlloc            pfnAlignedAlloc;
+	typedef MaskedOcclusionCulling::pfnAlignedFree             pfnAlignedFree;
+
+	MaskedOcclusionCulling *CreateMaskedOcclusionCulling(pfnAlignedAlloc alignedAlloc, pfnAlignedFree alignedFree)
+	{
+		MaskedOcclusionCullingPrivate *object = (MaskedOcclusionCullingPrivate *)alignedAlloc(64, sizeof(MaskedOcclusionCullingPrivate));
+		new (object) MaskedOcclusionCullingPrivate(alignedAlloc, alignedFree);
+		return object;
+	}
+};
+
+#else
+
+namespace MaskedOcclusionCullingAVX512
+{
+	typedef MaskedOcclusionCulling::pfnAlignedAlloc            pfnAlignedAlloc;
+	typedef MaskedOcclusionCulling::pfnAlignedFree             pfnAlignedFree;
+
+	MaskedOcclusionCulling *CreateMaskedOcclusionCulling(pfnAlignedAlloc alignedAlloc, pfnAlignedFree alignedFree)
+	{
+		return nullptr;
+	}
+};
+
+#endif
diff --git a/neo/engine/renderer/RenderSystem_init.cpp b/neo/engine/renderer/RenderSystem_init.cpp
index 71580ce0..4645bcbd 100644
--- a/neo/engine/renderer/RenderSystem_init.cpp
+++ b/neo/engine/renderer/RenderSystem_init.cpp
@@ -102,6 +102,7 @@ idCVar r_skipRenderContext( "r_skipRenderContext", "0", CVAR_RENDERER | CVAR_BOO
 idCVar r_skipTranslucent( "r_skipTranslucent", "0", CVAR_RENDERER | CVAR_BOOL, "skip the translucent interaction rendering" );
 idCVar r_skipAmbient( "r_skipAmbient", "0", CVAR_RENDERER | CVAR_BOOL, "bypasses all non-interaction drawing" );
 idCVar r_skipNewAmbient( "r_skipNewAmbient", "0", CVAR_RENDERER | CVAR_BOOL | CVAR_ARCHIVE, "bypasses all vertex/fragment program ambient drawing" );
+idCVar r_skipTerrain( "r_skipTerrain", "0", CVAR_RENDERER | CVAR_BOOL, "bypasses render-world terrain drawing" );
 idCVar r_skipBlendLights( "r_skipBlendLights", "0", CVAR_RENDERER | CVAR_BOOL, "skip all blend lights" );
 idCVar r_skipFogLights( "r_skipFogLights", "0", CVAR_RENDERER | CVAR_BOOL, "skip all fog lights" );
 idCVar r_skipDeforms( "r_skipDeforms", "0", CVAR_RENDERER | CVAR_BOOL, "leave all deform materials in their original state" );
diff --git a/neo/engine/renderer/RenderWorld.cpp b/neo/engine/renderer/RenderWorld.cpp
index c05e0aed..ae5590e1 100644
--- a/neo/engine/renderer/RenderWorld.cpp
+++ b/neo/engine/renderer/RenderWorld.cpp
@@ -113,6 +113,7 @@ idRenderWorldLocal::idRenderWorldLocal
 idRenderWorldLocal::idRenderWorldLocal(dxrWorldId_t dxrWorldId) {
 	mapName.Clear();
 	mapTimeStamp = FILE_NOT_FOUND_TIMESTAMP;
+	terrainTimeStamp = FILE_NOT_FOUND_TIMESTAMP;
 
 	this->dxrWorldId = tr.dxrWorldHandles[dxrWorldId];
 
diff --git a/neo/engine/renderer/RenderWorld_load.cpp b/neo/engine/renderer/RenderWorld_load.cpp
index c6e44bf9..aebb20b5 100644
--- a/neo/engine/renderer/RenderWorld_load.cpp
+++ b/neo/engine/renderer/RenderWorld_load.cpp
@@ -46,6 +46,7 @@ void idRenderWorldLocal::FreeWorld() {
 	// A map reload is a hard boundary for path-tracing state.  Clear any
 	// persistent lights / temporal history before replacing proc geometry.
 	glRaytracingLightingClearLights(true);
+	ClearWorldTerrain();
 
 	// Delete proc-created DXR meshes before clearing the scene, so the ray
 	// tracing layer can invalidate any instances that still reference them.
@@ -932,13 +933,17 @@ bool idRenderWorldLocal::InitFromMap( const char *name ) {
 	// and try to skip all the work
 	ID_TIME_T currentTimeStamp;
 	fileSystem->ReadFile( filename, NULL, &currentTimeStamp );
+	idStr terrainFileName = idTerrainModel::FileNameForMap( name );
+	ID_TIME_T currentTerrainTimeStamp;
+	fileSystem->ReadFile( terrainFileName, NULL, &currentTerrainTimeStamp );
 
 	if ( name == mapName ) {
-		if ( currentTimeStamp != FILE_NOT_FOUND_TIMESTAMP && currentTimeStamp == mapTimeStamp ) {
+		if ( currentTimeStamp != FILE_NOT_FOUND_TIMESTAMP && currentTimeStamp == mapTimeStamp && currentTerrainTimeStamp == terrainTimeStamp ) {
 			common->Printf( "idRenderWorldLocal::InitFromMap: retaining existing map\n" );
 			glRaytracingLightingClearLights(true);
 			FreeDefs();
 			TouchWorldModels();
+			TouchWorldTerrainMaterials();
 			LoadWorldDecals();
 			AddWorldModelEntities();
 			ClearPortalStates();
@@ -960,6 +965,7 @@ bool idRenderWorldLocal::InitFromMap( const char *name ) {
 	mapName = name;
 	mapTimeStamp = currentTimeStamp;
 	LoadWorldDecals();
+	LoadWorldTerrain();
 
 	// if we are writing a demo, archive the load command
 	if ( session->writeDemo ) {
diff --git a/neo/engine/renderer/RenderWorld_local.h b/neo/engine/renderer/RenderWorld_local.h
index 1c46a6a0..ec3b6056 100644
--- a/neo/engine/renderer/RenderWorld_local.h
+++ b/neo/engine/renderer/RenderWorld_local.h
@@ -29,6 +29,8 @@ If you have questions concerning this license or the applicable additional terms
 #ifndef __RENDERWORLDLOCAL_H__
 #define __RENDERWORLDLOCAL_H__
 
+#include "../models/TerrainModel.h"
+
 // assume any lightDef or entityDef index above this is an internal error
 const int LUDICROUS_INDEX	= 10000;
 
@@ -153,6 +155,7 @@ public:
 
 	idStr					mapName;				// ie: maps/tim_dm2.proc, written to demoFile
 	ID_TIME_T					mapTimeStamp;			// for fast reloads of the same level
+	ID_TIME_T					terrainTimeStamp;
 
 	areaNode_t *			areaNodes;
 	int						numAreaNodes;
@@ -183,6 +186,7 @@ public:
 
 	idList<idRenderModel *>	localModels;
 	idList<renderWorldDecal_t>	worldDecals;
+	idTerrainModel			terrainModel;
 
 	idList<idRenderEntityLocal*>	entityDefs;
 	idList<idRenderLightLocal*>		lightDefs;
@@ -204,6 +208,9 @@ public:
 	void					ClearWorld();
 	void					FreeDefs();
 	void					TouchWorldModels( void );
+	void					ClearWorldTerrain();
+	void					LoadWorldTerrain();
+	void					TouchWorldTerrainMaterials();
 	void					AddWorldModelEntities();
 	void					ClearPortalStates();
 	void					LoadWorldDecals();
diff --git a/neo/engine/renderer/RenderWorld_terrain.cpp b/neo/engine/renderer/RenderWorld_terrain.cpp
new file mode 100644
index 00000000..78422f83
--- /dev/null
+++ b/neo/engine/renderer/RenderWorld_terrain.cpp
@@ -0,0 +1,86 @@
+/*
+===========================================================================
+
+Render-world terrain loading
+
+===========================================================================
+*/
+
+#include "precompiled.h"
+#pragma hdrstop
+
+#include "tr_local.h"
+
+static idStr R_WorldTerrainFileName( const char *mapName ) {
+	return idTerrainModel::FileNameForMap( mapName );
+}
+
+void idRenderWorldLocal::ClearWorldTerrain() {
+	for ( int i = 0; i < terrainModel.NumTerrains(); i++ ) {
+		idTerrainPatch *terrain = terrainModel.Terrain( i );
+		if ( terrain && terrain->paintTexture != 0 ) {
+			GLuint texture = terrain->paintTexture;
+			glDeleteTextures( 1, &texture );
+			terrain->paintTexture = 0;
+		}
+	}
+	terrainModel.Clear();
+	terrainTimeStamp = FILE_NOT_FOUND_TIMESTAMP;
+}
+
+void idRenderWorldLocal::TouchWorldTerrainMaterials() {
+	for ( int i = 0; i < terrainModel.NumTerrains(); i++ ) {
+		idTerrainPatch *terrain = terrainModel.Terrain( i );
+		if ( !terrain ) {
+			continue;
+		}
+		terrain->EnsureLayerData( "textures/common/caulk" );
+		for ( int layer = 0; layer < TERRAIN_MAX_LAYERS; layer++ ) {
+			if ( terrain->layerMaterials[layer].IsEmpty() ) {
+				continue;
+			}
+			const idMaterial *material = declManager->FindMaterial( terrain->layerMaterials[layer].c_str(), false );
+			if ( material && !material->TestMaterialFlag( MF_DEFAULTED ) ) {
+				const_cast<idMaterial *>( material )->AddReference();
+				material->GetDiffuseImage( NULL );
+				material->GetBumpStage();
+			}
+		}
+	}
+}
+
+void idRenderWorldLocal::LoadWorldTerrain() {
+	ClearWorldTerrain();
+	if ( mapName.IsEmpty() ) {
+		return;
+	}
+
+	idStr filename = R_WorldTerrainFileName( mapName.c_str() );
+	fileSystem->ReadFile( filename, NULL, &terrainTimeStamp );
+	if ( terrainTimeStamp == FILE_NOT_FOUND_TIMESTAMP ) {
+		return;
+	}
+
+	if ( !terrainModel.LoadFile( filename.c_str(), "textures/common/caulk" ) ) {
+		common->Warning( "idRenderWorldLocal::LoadWorldTerrain: failed to load %s", filename.c_str() );
+		ClearWorldTerrain();
+		return;
+	}
+
+	for ( int i = 0; i < terrainModel.NumTerrains(); i++ ) {
+		idTerrainPatch *terrain = terrainModel.Terrain( i );
+		if ( !terrain ) {
+			continue;
+		}
+		terrain->paintTexture = 0;
+		terrain->EnsureLayerData( "textures/common/caulk" );
+		terrain->MarkPaintTextureDirty();
+		terrain->UpdateBounds();
+	}
+	TouchWorldTerrainMaterials();
+
+	common->Printf( "loaded %i terrain patch%s from %s\n",
+		terrainModel.NumTerrains(),
+		terrainModel.NumTerrains() == 1 ? "" : "es",
+		filename.c_str() );
+}
diff --git a/neo/engine/renderer/draw_common.cpp b/neo/engine/renderer/draw_common.cpp
index 53ff8d6e..6b60c440 100644
--- a/neo/engine/renderer/draw_common.cpp
+++ b/neo/engine/renderer/draw_common.cpp
@@ -788,6 +788,93 @@ void RB_SetProgramEnvironmentSpace( void ) {
 	glProgramEnvParameter4fvARB( GL_VERTEX_PROGRAM_ARB, 8, parm );
 }
 
+static bool RB_IsTerrainBlendMaterialName( const char *name ) {
+	if ( !name || !name[0] ) {
+		return false;
+	}
+	return idStr::Icmpn( name, "terrainBlend/", sizeof( "terrainBlend/" ) - 1 ) == 0 ||
+		idStr::Icmpn( name, "textures/terrain_blend/", sizeof( "textures/terrain_blend/" ) - 1 ) == 0;
+}
+
+static bool RB_SurfaceUsesTerrainBlend( const drawSurf_t *surf ) {
+	if ( !surf || !surf->material ) {
+		return false;
+	}
+	if ( surf->dsFlags & DSF_TERRAIN_BLEND ) {
+		return true;
+	}
+	return RB_IsTerrainBlendMaterialName( surf->material->GetName() );
+}
+
+static const shaderStage_t *RB_FindTerrainBlendStages( const drawSurf_t *surf, const float *regs, idImage **layerImages, idImage **normalImages, int maxLayers ) {
+	for ( int i = 0; i < maxLayers; i++ ) {
+		layerImages[i] = NULL;
+		normalImages[i] = NULL;
+	}
+
+	const idMaterial *shader = surf->material;
+	const shaderStage_t *firstStage = NULL;
+	int layer = 0;
+	int normalLayer = 0;
+	for ( int stage = 0; stage < shader->GetNumStages(); stage++ ) {
+		const shaderStage_t *pStage = shader->GetStage( stage );
+
+		if ( regs[pStage->conditionRegister] == 0 ) {
+			continue;
+		}
+		if ( pStage->lighting == SL_BUMP ) {
+			if ( normalLayer < maxLayers ) {
+				normalImages[normalLayer] = pStage->texture.image;
+			}
+			normalLayer++;
+			continue;
+		}
+		if ( pStage->lighting != SL_AMBIENT ) {
+			continue;
+		}
+		if ( ( pStage->drawStateBits & ( GLS_SRCBLEND_BITS | GLS_DSTBLEND_BITS ) ) == ( GLS_SRCBLEND_ZERO | GLS_DSTBLEND_ONE ) ) {
+			continue;
+		}
+
+		if ( !firstStage ) {
+			firstStage = pStage;
+		}
+		if ( layer < maxLayers ) {
+			layerImages[layer] = pStage->texture.image;
+		}
+		layer++;
+	}
+
+	return firstStage;
+}
+
+static void RB_BindTerrainBlendLayers( idImage **layerImages, idImage **normalImages, int maxLayers ) {
+	idImage *baseImage = layerImages[0] ? layerImages[0] : globalImages->whiteImage;
+	idImage *flatNormal = globalImages->flatNormalMap ? globalImages->flatNormalMap : globalImages->whiteImage;
+	glTerrainWeightTextureQD3D12( 0 );
+	for ( int layer = 0; layer < maxLayers; layer++ ) {
+		idImage *image = layerImages[layer] ? layerImages[layer] : baseImage;
+		GL_SelectTexture( 0 );
+		image->Bind();
+		glTerrainLayerTextureQD3D12( layer, image->texnum );
+
+		idImage *normalImage = normalImages[layer] ? normalImages[layer] : flatNormal;
+		normalImage->Bind();
+		glTerrainLayerNormalTextureQD3D12( layer, normalImage->texnum );
+	}
+	GL_SelectTexture( 0 );
+}
+
+static void RB_ClearTerrainBlendLayers( int maxLayers ) {
+	glTerrainBlendEnableQD3D12( GL_FALSE );
+	glTerrainBlendOpacityQD3D12( 1.0f );
+	glTerrainWeightTextureQD3D12( 0 );
+	for ( int layer = 0; layer < maxLayers; layer++ ) {
+		glTerrainLayerTextureQD3D12( layer, 0 );
+		glTerrainLayerNormalTextureQD3D12( layer, 0 );
+	}
+}
+
 /*
 ==================
 RB_STD_T_RenderShaderPasses
@@ -880,7 +967,33 @@ void RB_STD_T_RenderShaderPasses( const drawSurf_t *surf ) {
 	glGlassMaterialQD3D12( glassMaterial ? GL_TRUE : GL_FALSE );
 	glGeometryFlagf( glassMaterial ? ( baseGeometryFlag + (float)GEOMETRY_FLAG_GLASS ) : baseGeometryFlag );
 
-	for ( stage = 0; stage < shader->GetNumStages() ; stage++ ) {		
+	bool terrainBlendDrawn = false;
+	if ( RB_SurfaceUsesTerrainBlend( surf ) ) {
+		idImage *terrainLayerImages[4];
+		idImage *terrainNormalImages[4];
+		const shaderStage_t *terrainStage = RB_FindTerrainBlendStages( surf, regs, terrainLayerImages, terrainNormalImages, 4 );
+		if ( terrainStage ) {
+			RB_BindTerrainBlendLayers( terrainLayerImages, terrainNormalImages, 4 );
+			glTerrainBlendEnableQD3D12( GL_TRUE );
+			glTerrainBlendOpacityQD3D12( 1.0f );
+			glColorPointer( 4, GL_UNSIGNED_BYTE, sizeof( idDrawVert ), (void *)&ac->color );
+			glEnableClientState( GL_COLOR_ARRAY );
+			glEnable( GL_DEPTH_TEST );
+			glEnable( GL_BLEND );
+
+			const int terrainState = ( terrainStage->drawStateBits &
+				~( GLS_SRCBLEND_BITS | GLS_DSTBLEND_BITS | GLS_DEPTHFUNC_ALWAYS | GLS_DEPTHFUNC_EQUAL ) ) | backEnd.depthFunc;
+			GL_State( terrainState );
+			RB_DrawElementsWithCounters( tri );
+
+			glDisableClientState( GL_COLOR_ARRAY );
+			RB_ClearTerrainBlendLayers( 4 );
+			terrainBlendDrawn = true;
+		}
+	}
+
+	if ( !terrainBlendDrawn ) {
+	for ( stage = 0; stage < shader->GetNumStages() ; stage++ ) {
 		pStage = shader->GetStage(stage);
 
 		// check the enable condition
@@ -1074,6 +1187,7 @@ void RB_STD_T_RenderShaderPasses( const drawSurf_t *surf ) {
 			GL_TexEnv( GL_MODULATE );
 		}
 	}
+	}
 
 	// reset polygon offset
 	if ( shader->TestMaterialFlag(MF_POLYGONOFFSET) ) {
@@ -1651,6 +1765,13 @@ void	RB_STD_DrawView( void ) {
 	// Draw the sky. 
 	RB_DrawSkyDome(backEnd.viewDef);
 
+	// Terrain is render-world data, not a proc drawSurf. Draw it after the sky
+	// has cleared depth, then let the normal opaque pass depth-test against it.
+	if (backEnd.viewDef->renderWorld)
+	{
+		RB_DrawTerrain(backEnd.viewDef);
+	}
+
 	// fill the depth buffer and clear color buffer to black except on
 	// subviews
 	RB_STD_FillDepthBuffer( drawSurfs, numDrawSurfs );
diff --git a/neo/engine/renderer/draw_terrain.cpp b/neo/engine/renderer/draw_terrain.cpp
new file mode 100644
index 00000000..e8181d62
--- /dev/null
+++ b/neo/engine/renderer/draw_terrain.cpp
@@ -0,0 +1,234 @@
+/*
+===========================================================================
+
+Render-world terrain drawing
+
+===========================================================================
+*/
+
+#include "precompiled.h"
+#pragma hdrstop
+
+#include "tr_local.h"
+
+static byte RB_TerrainWeightToByte( float value ) {
+	return (byte)idMath::ClampInt( 0, 255, (int)floorf( idMath::ClampFloat( 0.0f, 1.0f, value ) * 255.0f + 0.5f ) );
+}
+
+static void RB_TerrainFillWeightPixels( idTerrainPatch *terrain, int minX, int minY, int uploadWidth, int uploadHeight, idList<byte> &pixels ) {
+	pixels.SetNum( uploadWidth * uploadHeight * 4 );
+	for ( int y = 0; y < uploadHeight; y++ ) {
+		for ( int x = 0; x < uploadWidth; x++ ) {
+			const int sample = terrain->PaintIndex( minX + x, minY + y );
+			const int pixel = ( y * uploadWidth + x ) * 4;
+			const idVec4 weights = idTerrainPatch::NormalizeLayerWeight( terrain->paintWeights[sample] );
+			pixels[pixel + 0] = RB_TerrainWeightToByte( weights.x );
+			pixels[pixel + 1] = RB_TerrainWeightToByte( weights.y );
+			pixels[pixel + 2] = RB_TerrainWeightToByte( weights.z );
+			pixels[pixel + 3] = RB_TerrainWeightToByte( weights.w );
+		}
+	}
+}
+
+static GLuint RB_TerrainUpdateWeightTexture( idTerrainPatch *terrain ) {
+	terrain->EnsureLayerData( "textures/common/caulk" );
+
+	bool newTexture = false;
+	if ( terrain->paintTexture == 0 ) {
+		glGenTextures( 1, &terrain->paintTexture );
+		terrain->MarkPaintTextureDirty();
+		newTexture = true;
+	}
+	if ( !terrain->paintTextureDirty ) {
+		return terrain->paintTexture;
+	}
+
+	const int minX = idMath::ClampInt( 0, terrain->paintWidth - 1, terrain->paintDirtyMinX );
+	const int minY = idMath::ClampInt( 0, terrain->paintHeight - 1, terrain->paintDirtyMinY );
+	const int maxX = idMath::ClampInt( 0, terrain->paintWidth - 1, terrain->paintDirtyMaxX );
+	const int maxY = idMath::ClampInt( 0, terrain->paintHeight - 1, terrain->paintDirtyMaxY );
+	const bool validRect = maxX >= minX && maxY >= minY;
+	const bool fullUpload = newTexture || !validRect ||
+		( minX == 0 && minY == 0 && maxX == terrain->paintWidth - 1 && maxY == terrain->paintHeight - 1 );
+	const int uploadX = fullUpload ? 0 : minX;
+	const int uploadY = fullUpload ? 0 : minY;
+	const int uploadWidth = fullUpload ? terrain->paintWidth : ( maxX - minX + 1 );
+	const int uploadHeight = fullUpload ? terrain->paintHeight : ( maxY - minY + 1 );
+
+	GL_SelectTexture( 0 );
+	glBindTexture( GL_TEXTURE_2D, terrain->paintTexture );
+	backEnd.glState.tmu[backEnd.glState.currenttmu].current2DMap = terrain->paintTexture;
+	backEnd.glState.tmu[backEnd.glState.currenttmu].textureType = TT_2D;
+	glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
+	glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
+	glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
+	glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
+
+	idList<byte> pixels;
+	RB_TerrainFillWeightPixels( terrain, uploadX, uploadY, uploadWidth, uploadHeight, pixels );
+	if ( fullUpload ) {
+		glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, terrain->paintWidth, terrain->paintHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels.Ptr() );
+	} else {
+		glTexSubImage2D( GL_TEXTURE_2D, 0, uploadX, uploadY, uploadWidth, uploadHeight, GL_RGBA, GL_UNSIGNED_BYTE, pixels.Ptr() );
+	}
+
+	terrain->ClearPaintTextureDirtyRect();
+	return terrain->paintTexture;
+}
+
+static const idMaterial *RB_TerrainLayerMaterial( const char *materialName ) {
+	if ( !materialName || !materialName[0] ) {
+		return NULL;
+	}
+	const idMaterial *material = declManager->FindMaterial( materialName, false );
+	if ( !material || material->TestMaterialFlag( MF_DEFAULTED ) ) {
+		return NULL;
+	}
+	return material;
+}
+
+static idImage *RB_TerrainLayerDiffuseImage( const char *materialName ) {
+	const idMaterial *material = RB_TerrainLayerMaterial( materialName );
+	if ( !material ) {
+		return NULL;
+	}
+	idImage *image = material->GetDiffuseImage( NULL );
+	return image ? image : material->GetEditorImage();
+}
+
+static idImage *RB_TerrainLayerNormalImage( const char *materialName ) {
+	idImage *flatNormal = globalImages->flatNormalMap ? globalImages->flatNormalMap : globalImages->whiteImage;
+	const idMaterial *material = RB_TerrainLayerMaterial( materialName );
+	if ( !material ) {
+		return flatNormal;
+	}
+	const shaderStage_t *bumpStage = material->GetBumpStage();
+	if ( !bumpStage || !bumpStage->texture.image ) {
+		return flatNormal;
+	}
+	return bumpStage->texture.image;
+}
+
+static void RB_TerrainBindLayerTextures( idTerrainPatch *terrain ) {
+	terrain->EnsureLayerData( "textures/common/caulk" );
+
+	idImage *baseImage = RB_TerrainLayerDiffuseImage( terrain->layerMaterials[0].c_str() );
+	if ( !baseImage ) {
+		baseImage = globalImages->whiteImage;
+	}
+
+	for ( int layer = 0; layer < TERRAIN_MAX_LAYERS; layer++ ) {
+		idImage *image = RB_TerrainLayerDiffuseImage( terrain->layerMaterials[layer].c_str() );
+		if ( !image ) {
+			image = baseImage;
+		}
+		GL_SelectTexture( 0 );
+		image->Bind();
+		glTerrainLayerTextureQD3D12( layer, image->texnum );
+
+		idImage *normalImage = RB_TerrainLayerNormalImage( terrain->layerMaterials[layer].c_str() );
+		if ( !normalImage ) {
+			normalImage = globalImages->flatNormalMap ? globalImages->flatNormalMap : globalImages->whiteImage;
+		}
+		normalImage->Bind();
+		glTerrainLayerNormalTextureQD3D12( layer, normalImage->texnum );
+	}
+
+	glTerrainWeightTextureQD3D12( RB_TerrainUpdateWeightTexture( terrain ) );
+}
+
+static void RB_TerrainClearLayerTextureBindings() {
+	glTerrainBlendEnableQD3D12( GL_FALSE );
+	glTerrainBlendOpacityQD3D12( 1.0f );
+	glTerrainWeightTextureQD3D12( 0 );
+	for ( int layer = 0; layer < TERRAIN_MAX_LAYERS; layer++ ) {
+		glTerrainLayerTextureQD3D12( layer, 0 );
+		glTerrainLayerNormalTextureQD3D12( layer, 0 );
+	}
+}
+
+static void RB_TerrainSubmitVertex( const idTerrainPatch *terrain, int x, int y ) {
+	idVec3 vertex = terrain->Vertex( x, y );
+	idVec3 normal = terrain->VertexNormal( x, y );
+	const float u = (float)x / (float)( terrain->width - 1 );
+	const float v = (float)y / (float)( terrain->height - 1 );
+	const float layerS = terrain->WorldWidth() * u / 256.0f;
+	const float layerT = terrain->WorldHeight() * v / 256.0f;
+	const int paintX = idMath::ClampInt( 0, terrain->paintWidth - 1, (int)floorf( u * (float)( terrain->paintWidth - 1 ) + 0.5f ) );
+	const int paintY = idMath::ClampInt( 0, terrain->paintHeight - 1, (int)floorf( v * (float)( terrain->paintHeight - 1 ) + 0.5f ) );
+	const idVec4 weights = idTerrainPatch::NormalizeLayerWeight( terrain->SamplePaintWeight( paintX, paintY ) );
+
+	glColor4fv( weights.ToFloatPtr() );
+	glNormal3fv( normal.ToFloatPtr() );
+	glMultiTexCoord2fARB( GL_TEXTURE0_ARB, layerS, layerT );
+	glMultiTexCoord2fARB( GL_TEXTURE1_ARB, u, v );
+	glVertex3fv( vertex.ToFloatPtr() );
+}
+
+static bool RB_TerrainCullPatch( const idTerrainPatch *terrain, const viewDef_t *viewDef ) {
+	if ( !terrain || !viewDef ) {
+		return true;
+	}
+	return R_CullLocalBox( terrain->bounds, viewDef->worldSpace.modelMatrix, 5, viewDef->frustum );
+}
+
+static void RB_TerrainDrawPatch( idTerrainPatch *terrain ) {
+	if ( !terrain || terrain->width < 2 || terrain->height < 2 ) {
+		return;
+	}
+
+	RB_TerrainBindLayerTextures( terrain );
+
+	glTerrainBlendEnableQD3D12( GL_TRUE );
+	glTerrainBlendOpacityQD3D12( 1.0f );
+	GL_State( GLS_DEPTHFUNC_LESS );
+	GL_Cull( CT_TWO_SIDED );
+	GL_SelectTexture( 0 );
+	glEnable( GL_TEXTURE_2D );
+	glEnable( GL_DEPTH_TEST );
+	glDepthMask( GL_TRUE );
+	glEnable( GL_BLEND );
+
+	for ( int y = 0; y < terrain->height - 1; y++ ) {
+		glBegin( GL_TRIANGLE_STRIP );
+		for ( int x = 0; x < terrain->width; x++ ) {
+			RB_TerrainSubmitVertex( terrain, x, y );
+			RB_TerrainSubmitVertex( terrain, x, y + 1 );
+		}
+		glEnd();
+	}
+
+	RB_TerrainClearLayerTextureBindings();
+}
+
+void RB_DrawTerrain( const viewDef_t *viewDef ) {
+	if ( r_skipTerrain.GetBool() || !viewDef || !viewDef->renderWorld || !viewDef->viewEntitys ) {
+		return;
+	}
+
+	idRenderWorldLocal *world = viewDef->renderWorld;
+	if ( world->terrainModel.NumTerrains() <= 0 ) {
+		return;
+	}
+
+	RB_LogComment( "---------- RB_DrawTerrain ----------\n" );
+
+	glMatrixMode( GL_MODELVIEW );
+	glLoadMatrixf( viewDef->worldSpace.modelViewMatrix );
+	backEnd.currentSpace = &viewDef->worldSpace;
+
+	for ( int i = 0; i < world->terrainModel.NumTerrains(); i++ ) {
+		idTerrainPatch *terrain = world->terrainModel.Terrain( i );
+		if ( !terrain || RB_TerrainCullPatch( terrain, viewDef ) ) {
+			continue;
+		}
+		RB_TerrainDrawPatch( terrain );
+	}
+
+	GL_Cull( CT_FRONT_SIDED );
+	glColor4f( 1.0f, 1.0f, 1.0f, 1.0f );
+	glEnable( GL_BLEND );
+	GL_SelectTexture( 0 );
+	globalImages->BindNull();
+	GL_ClearStateDelta();
+}
diff --git a/neo/engine/renderer/tr_local.h b/neo/engine/renderer/tr_local.h
index 979fe2aa..a17a3bc8 100644
--- a/neo/engine/renderer/tr_local.h
+++ b/neo/engine/renderer/tr_local.h
@@ -106,6 +106,7 @@ SURFACES
 static const int	DSF_VIEW_INSIDE_SHADOW		= 1;
 static const int	DSF_SCREEN_SPACE_PARTICLE	= 2;
 static const int	DSF_SCREEN_SPACE_PARTICLE_EMISSIVE = 4;
+static const int	DSF_TERRAIN_BLEND			= 8;
 
 typedef struct drawSurf_s {
 	const srfTriangles_t	*geo;
@@ -907,6 +908,7 @@ extern idCVar r_skipRenderContext;		// NULL the rendering context during backend
 extern idCVar r_skipTranslucent;		// skip the translucent interaction rendering
 extern idCVar r_skipAmbient;			// bypasses all non-interaction drawing
 extern idCVar r_skipNewAmbient;			// bypasses all vertex/fragment program ambients
+extern idCVar r_skipTerrain;			// bypasses render-world terrain drawing
 extern idCVar r_skipBlendLights;		// skip all blend lights
 extern idCVar r_skipFogLights;			// skip all fog lights
 extern idCVar r_skipSubviews;			// 1 = don't render any mirrors / cameras / etc
@@ -1316,6 +1318,7 @@ void RB_BindStageTexture( const float *shaderRegisters, const textureStage_t *te
 void RB_FinishStageTexture( const textureStage_t *texture, const drawSurf_t *surf );
 void RB_StencilShadowPass( const drawSurf_t *drawSurfs );
 void RB_STD_DrawView( void );
+void RB_DrawTerrain( const viewDef_t *viewDef );
 void RB_STD_FogAllLights( void );
 void RB_BakeTextureMatrixIntoTexgen( idPlane lightProject[3], const float textureMatrix[16] );
 
diff --git a/neo/engine/renderer/tr_trisurf.cpp b/neo/engine/renderer/tr_trisurf.cpp
index 8d4116c9..2aec85c7 100644
--- a/neo/engine/renderer/tr_trisurf.cpp
+++ b/neo/engine/renderer/tr_trisurf.cpp
@@ -2116,7 +2116,7 @@ void R_CleanupTriangles( srfTriangles_t *tri, bool createNormals, bool identifyS
 //	R_RemoveUnusedVerts( tri );
 
 	if ( identifySilEdges ) {
-		R_IdentifySilEdges( tri, true );	// assume it is non-deformable, and omit coplanar edges
+//		R_IdentifySilEdges( tri, true );	// assume it is non-deformable, and omit coplanar edges
 	}
 
 	// bust vertexes that share a mirrored edge into separate vertexes
diff --git a/neo/engine/tools/compilers/dmap/dmap.cpp b/neo/engine/tools/compilers/dmap/dmap.cpp
index c192e077..bcf2aeff 100644
--- a/neo/engine/tools/compilers/dmap/dmap.cpp
+++ b/neo/engine/tools/compilers/dmap/dmap.cpp
@@ -366,7 +366,11 @@ void Dmap( const idCmdArgs &args ) {
 			// create the collision map
 			start = Sys_Milliseconds();
 
+#if defined(PREY) || defined(QUAKE4)
 			collisionModelManager->LoadMap( dmapGlobals.dmapFile );
+#else
+			collisionModelManager->LoadMap( dmapGlobals.dmapFile, true );
+#endif
 #ifdef QUAKE4
 			collisionModelManager->FreeMap(NULL);
 #else
diff --git a/neo/engine/tools/radiant/CamWnd.cpp b/neo/engine/tools/radiant/CamWnd.cpp
index 657946e7..df7e73dd 100644
--- a/neo/engine/tools/radiant/CamWnd.cpp
+++ b/neo/engine/tools/radiant/CamWnd.cpp
@@ -34,6 +34,7 @@ If you have questions concerning this license or the applicable additional terms
 #include "EditorMap.h"
 #include "XYWnd.h"
 #include "CamWnd.h"
+#include "Terrain.h"
 #include "OutlinerDlg.h"
 #include "splines.h"
 #include <GL/glu.h>
@@ -1099,6 +1100,19 @@ static const char* CAMWND_PROP_DECAL_EDITING = "QER_CamWnd_DecalEditing";
 #define CAMWND_MENU_CMD_DECAL_SCALE_DOWN  62112
 #define CAMWND_MENU_CMD_DECAL_ROTATE_CCW  62113
 #define CAMWND_MENU_CMD_DECAL_ROTATE_CW   62114
+#define CAMWND_MENU_CMD_TERRAIN_EDITING   62115
+#define CAMWND_MENU_CMD_TERRAIN_CREATE    62116
+#define CAMWND_MENU_CMD_TERRAIN_RADIUS_UP 62117
+#define CAMWND_MENU_CMD_TERRAIN_RADIUS_DOWN 62118
+#define CAMWND_MENU_CMD_TERRAIN_STRENGTH_UP 62119
+#define CAMWND_MENU_CMD_TERRAIN_STRENGTH_DOWN 62120
+#define CAMWND_MENU_CMD_TERRAIN_LAYERS 62121
+#define CAMWND_MENU_CMD_PAINT_MODE     62122
+#define CAMWND_MENU_CMD_PAINT_LAYER_BASE 62123
+#define CAMWND_MENU_CMD_PAINT_LAYER_1  62123
+#define CAMWND_MENU_CMD_PAINT_LAYER_2  62124
+#define CAMWND_MENU_CMD_PAINT_LAYER_3  62125
+#define CAMWND_MENU_CMD_PAINT_LAYER_4  62126
 
 #define CAMWND_FILTER_HIDE_WORLD          0x00000001
 #define CAMWND_FILTER_HIDE_PATCHES        0x00000002
@@ -1198,15 +1212,23 @@ static void CamWnd_GetMenuItemRect(HWND hWnd, int item, RECT& rect) {
 		rect.left = 86;
 		rect.right = 156;
 	}
-	else {
+	else if (item == 2) {
 		rect.left = 156;
 		rect.right = 236;
 	}
+	else if (item == 3) {
+		rect.left = 236;
+		rect.right = 326;
+	}
+	else {
+		rect.left = 326;
+		rect.right = 396;
+	}
 }
 
 static int CamWnd_MenuHitTest(HWND hWnd, int x, int y) {
 	RECT rect;
-	for (int i = 0; i < 3; i++) {
+	for (int i = 0; i < 5; i++) {
 		CamWnd_GetMenuItemRect(hWnd, i, rect);
 		if (x >= rect.left && x < rect.right && y >= rect.top && y < rect.bottom) {
 			return i;
@@ -1373,7 +1395,24 @@ static void CamWnd_ToggleCubicClipping(CCamWnd* cam) {
 	}
 }
 
+static void CamWnd_SelectTerrainPaintLayer(CCamWnd* cam, int layer) {
+	if (Terrain_NumTerrains() <= 0) {
+		Sys_Status("Create a terrain before painting\n", 0);
+		return;
+	}
+
+	Terrain_SetEditMode(true);
+	Terrain_SetPaintMode(true);
+	Terrain_SelectPaintLayer(layer);
+	CamWnd_RequestRedraw(cam);
+}
+
 static void CamWnd_HandleMenuCommand(CCamWnd* cam, int command) {
+	if (command >= CAMWND_MENU_CMD_PAINT_LAYER_BASE && command < CAMWND_MENU_CMD_PAINT_LAYER_BASE + 4) {
+		CamWnd_SelectTerrainPaintLayer(cam, command - CAMWND_MENU_CMD_PAINT_LAYER_BASE);
+		return;
+	}
+
 	switch (command) {
 	case CAMWND_MENU_CMD_REALTIME_LIGHTING:
 		CamWnd_ToggleRealtimeLighting(cam);
@@ -1396,6 +1435,45 @@ static void CamWnd_HandleMenuCommand(CCamWnd* cam, int command) {
 	case CAMWND_MENU_CMD_DECAL_ROTATE_CW:
 		CamWnd_RotateStencil(cam, 15.0f);
 		break;
+	case CAMWND_MENU_CMD_TERRAIN_EDITING:
+		Terrain_ToggleEditMode();
+		CamWnd_RequestRedraw(cam);
+		break;
+	case CAMWND_MENU_CMD_TERRAIN_CREATE:
+		Terrain_CreateDefaultAtCamera(cam);
+		CamWnd_RequestRedraw(cam);
+		break;
+	case CAMWND_MENU_CMD_TERRAIN_LAYERS:
+		if (Terrain_ShowLayersDialog(cam)) {
+			CamWnd_RequestRedraw(cam);
+		}
+		break;
+	case CAMWND_MENU_CMD_TERRAIN_RADIUS_UP:
+		Terrain_AdjustBrushRadius(1.25f);
+		CamWnd_RequestRedraw(cam);
+		break;
+	case CAMWND_MENU_CMD_TERRAIN_RADIUS_DOWN:
+		Terrain_AdjustBrushRadius(0.8f);
+		CamWnd_RequestRedraw(cam);
+		break;
+	case CAMWND_MENU_CMD_TERRAIN_STRENGTH_UP:
+		Terrain_AdjustBrushStrength(1.25f);
+		CamWnd_RequestRedraw(cam);
+		break;
+	case CAMWND_MENU_CMD_TERRAIN_STRENGTH_DOWN:
+		Terrain_AdjustBrushStrength(0.8f);
+		CamWnd_RequestRedraw(cam);
+		break;
+	case CAMWND_MENU_CMD_PAINT_MODE:
+		if (Terrain_NumTerrains() > 0) {
+			Terrain_SetEditMode(true);
+			Terrain_SetPaintMode(true);
+			CamWnd_RequestRedraw(cam);
+		}
+		else {
+			Sys_Status("Create a terrain before painting\n", 0);
+		}
+		break;
 	case CAMWND_MENU_CMD_SHOW_WORLD:
 		CamWnd_ToggleFilterBit(cam, CAMWND_FILTER_HIDE_WORLD);
 		break;
@@ -1483,6 +1561,69 @@ static void CamWnd_ShowDecalsMenu(HWND hWnd, CCamWnd* cam) {
 	}
 }
 
+static void CamWnd_ShowTerrainMenu(HWND hWnd, CCamWnd* cam) {
+	RECT itemRect;
+	POINT pt;
+	HMENU menu;
+	int command;
+
+	CamWnd_GetMenuItemRect(hWnd, 3, itemRect);
+	pt.x = itemRect.left;
+	pt.y = itemRect.bottom;
+	ClientToScreen(hWnd, &pt);
+
+	menu = CreatePopupMenu();
+	AppendMenu(menu, MF_STRING | (Terrain_IsEditMode() ? MF_CHECKED : 0), CAMWND_MENU_CMD_TERRAIN_EDITING, "Enable terrain editing (T)");
+	AppendMenu(menu, MF_STRING, CAMWND_MENU_CMD_TERRAIN_CREATE, "Create default terrain (Ctrl+T)");
+	UINT terrainFlags = MF_STRING | (Terrain_NumTerrains() > 0 ? 0 : MF_GRAYED);
+	AppendMenu(menu, terrainFlags, CAMWND_MENU_CMD_TERRAIN_LAYERS, "Terrain layers...");
+	AppendMenu(menu, MF_SEPARATOR, 0, NULL);
+	UINT toolFlags = terrainFlags;
+	AppendMenu(menu, toolFlags, CAMWND_MENU_CMD_TERRAIN_RADIUS_UP, "Increase brush radius (])");
+	AppendMenu(menu, toolFlags, CAMWND_MENU_CMD_TERRAIN_RADIUS_DOWN, "Decrease brush radius ([)");
+	AppendMenu(menu, toolFlags, CAMWND_MENU_CMD_TERRAIN_STRENGTH_UP, "Increase brush strength (+)");
+	AppendMenu(menu, toolFlags, CAMWND_MENU_CMD_TERRAIN_STRENGTH_DOWN, "Decrease brush strength (-)");
+
+	command = TrackPopupMenu(menu, TPM_RETURNCMD | TPM_LEFTALIGN | TPM_TOPALIGN, pt.x, pt.y, 0, hWnd, NULL);
+	DestroyMenu(menu);
+
+	if (command) {
+		CamWnd_HandleMenuCommand(cam, command);
+	}
+}
+
+static void CamWnd_ShowPaintMenu(HWND hWnd, CCamWnd* cam) {
+	RECT itemRect;
+	POINT pt;
+	HMENU menu;
+	int command;
+
+	CamWnd_GetMenuItemRect(hWnd, 4, itemRect);
+	pt.x = itemRect.left;
+	pt.y = itemRect.bottom;
+	ClientToScreen(hWnd, &pt);
+
+	const bool hasTerrain = Terrain_NumTerrains() > 0;
+	const UINT paintFlags = MF_STRING | (hasTerrain ? 0 : MF_GRAYED);
+	menu = CreatePopupMenu();
+	AppendMenu(menu, paintFlags | (Terrain_IsEditMode() && Terrain_IsPaintMode() ? MF_CHECKED : 0), CAMWND_MENU_CMD_PAINT_MODE, "Paint mode (P)");
+	AppendMenu(menu, MF_SEPARATOR, 0, NULL);
+	for (int layer = 0; layer < 4; layer++) {
+		UINT layerFlags = paintFlags;
+		if (Terrain_GetPaintLayer() == layer) {
+			layerFlags |= MF_CHECKED;
+		}
+		AppendMenu(menu, layerFlags, CAMWND_MENU_CMD_PAINT_LAYER_BASE + layer, va("Paint layer %i (%i)", layer + 1, layer + 1));
+	}
+
+	command = TrackPopupMenu(menu, TPM_RETURNCMD | TPM_LEFTALIGN | TPM_TOPALIGN, pt.x, pt.y, 0, hWnd, NULL);
+	DestroyMenu(menu);
+
+	if (command) {
+		CamWnd_HandleMenuCommand(cam, command);
+	}
+}
+
 static void CamWnd_ShowFiltersMenu(HWND hWnd, CCamWnd* cam) {
 	RECT itemRect;
 	POINT pt;
@@ -1531,6 +1672,12 @@ static void CamWnd_ShowTopMenu(HWND hWnd, int item) {
 	else if (item == 2) {
 		CamWnd_ShowDecalsMenu(hWnd, cam);
 	}
+	else if (item == 3) {
+		CamWnd_ShowTerrainMenu(hWnd, cam);
+	}
+	else if (item == 4) {
+		CamWnd_ShowPaintMenu(hWnd, cam);
+	}
 }
 
 static void CamWnd_RegisterMenuBarClass() {
@@ -3096,6 +3243,12 @@ static LRESULT CALLBACK CamWnd_MenuBarProc(HWND hWnd, UINT uMsg, WPARAM wParam,
 		CamWnd_GetMenuItemRect(hWnd, 2, itemRect);
 		RoundRect(hDC, itemRect.left + 3, itemRect.top + 2, itemRect.right - 3, itemRect.bottom - 2, 6, 6);
 		DrawText(hDC, "Decals", -1, &itemRect, DT_SINGLELINE | DT_CENTER | DT_VCENTER);
+		CamWnd_GetMenuItemRect(hWnd, 3, itemRect);
+		RoundRect(hDC, itemRect.left + 3, itemRect.top + 2, itemRect.right - 3, itemRect.bottom - 2, 6, 6);
+		DrawText(hDC, "Terrain", -1, &itemRect, DT_SINGLELINE | DT_CENTER | DT_VCENTER);
+		CamWnd_GetMenuItemRect(hWnd, 4, itemRect);
+		RoundRect(hDC, itemRect.left + 3, itemRect.top + 2, itemRect.right - 3, itemRect.bottom - 2, 6, 6);
+		DrawText(hDC, "Paint", -1, &itemRect, DT_SINGLELINE | DT_CENTER | DT_VCENTER);
 		::SelectObject(hDC, oldPen);
 		::SelectObject(hDC, oldBrush);
 		::DeleteObject(borderPen);
@@ -3207,6 +3360,7 @@ INT_PTR WINAPI CamWndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
 		if (cam) {
 			CamWnd_FaceExtrudeEnd(cam, false);
 			CamWnd_GizmoEnd(cam, false);
+			Terrain_CancelStroke();
 			CameraNav_Stop(cam);
 		}
 		SendMessage(hWnd, WM_NCACTIVATE, FALSE, 0);
@@ -3289,6 +3443,9 @@ void CCamWnd::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags) {
 		Map_DeleteSelectedDecal();
 		return;
 	}
+	if (Terrain_HandleKeyDown(this, nChar)) {
+		return;
+	}
 	if (CameraNav_HandleKeyDown(this, nChar)) {
 		return;
 	}
@@ -3303,6 +3460,9 @@ void CCamWnd::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags) {
 	if (CamWnd_HandleDecalTransformChar(this, nChar)) {
 		return;
 	}
+	if (Terrain_HandleChar(this, nChar)) {
+		return;
+	}
 	CWnd::OnChar(nChar, nRepCnt, nFlags);
 }
 
@@ -3347,6 +3507,7 @@ void CCamWnd::SetXYFriend(CXYWnd* pWnd) {
 void CCamWnd::OnDestroy() {
 	CamWnd_FaceExtrudeEnd(this, false);
 	CamWnd_GizmoEnd(this, false);
+	Terrain_CancelStroke();
 	CamWnd_ClearDecalPreview(this);
 	CamWnd_DestroyMenuBar(this);
 	CWnd::OnDestroy();
@@ -3370,6 +3531,11 @@ void CCamWnd::OnMouseMove(UINT nFlags, CPoint point) {
 	CRect	r;
 	GetClientRect(r);
 
+	if (Terrain_MouseMove(this, point, nFlags)) {
+		m_ptLastCursor = point;
+		return;
+	}
+
 	if (GetCapture() != this) {
 		CamWnd_UpdateDecalPreview(this, point);
 	}
@@ -3428,6 +3594,9 @@ void CCamWnd::OnLButtonDown(UINT nFlags, CPoint point) {
 		Sys_UpdateWindows(W_ALL);
 		return;
 	}
+	if (Terrain_LButtonDown(this, point, nFlags)) {
+		return;
+	}
 	if ((nFlags & MK_CONTROL) && (nFlags & MK_SHIFT) && CamWnd_FaceExtrudeBegin(this, point)) {
 		return;
 	}
@@ -3448,6 +3617,9 @@ void CCamWnd::OnLButtonDown(UINT nFlags, CPoint point) {
  =======================================================================================================================
  */
 void CCamWnd::OnLButtonUp(UINT nFlags, CPoint point) {
+	if (Terrain_LButtonUp(this, point, nFlags)) {
+		return;
+	}
 	if (CamWnd_GizmoIsActive(this)) {
 		CamWnd_GizmoMouseMove(this, point, nFlags);
 		CamWnd_GizmoEnd(this, true);
@@ -4448,6 +4620,7 @@ void CCamWnd::Cam_Draw() {
 
 	CamWnd_DrawActiveBrushes(this, renderMode, entityMode, brushFilter);
 	CamWnd_DrawRadiantLightFrustums(this);
+	Terrain_DrawCam(this);
 
 
 	//glDepthMask ( 1 ); // Ok, write now
diff --git a/neo/engine/tools/radiant/EditorMap.cpp b/neo/engine/tools/radiant/EditorMap.cpp
index f74c029b..4261497e 100644
--- a/neo/engine/tools/radiant/EditorMap.cpp
+++ b/neo/engine/tools/radiant/EditorMap.cpp
@@ -30,6 +30,7 @@ If you have questions concerning this license or the applicable additional terms
 #pragma hdrstop
 
 #include "qe3.h"
+#include "Terrain.h"
 
 int			mapModified;			// for quit confirmation (0 = clean, 1 = unsaved,
 
@@ -521,6 +522,7 @@ void Map_Free(void) {
 	// clear all the render and sound system data
 	g_qeglobals.rw->InitFromMap( NULL );
 	g_qeglobals.sw->ClearAllSoundEmitters();
+	Terrain_Clear();
 
 	Texture_ClearInuse();
 	Pointfile_Clear();
@@ -840,6 +842,7 @@ void Map_LoadFile(const char *filename) {
 		g_pParentWnd->GetCamera()->BuildRendererState();
 	}
 	Map_LoadDecals(filename);
+	Terrain_Load(filename);
 
 	Sys_EndWait();
 	Sys_UpdateWindows(W_ALL);
@@ -1086,6 +1089,7 @@ bool Map_SaveFile(const char *filename, bool use_region, bool autosave) {
 	map.Write(mapFile, mapExt, !(autosave || localFile));
 	if (!use_region) {
 		Map_SaveDecals(filename);
+		Terrain_Save(filename);
 	}
 	mapModified = 0;
 
diff --git a/neo/engine/tools/radiant/MainFrm.cpp b/neo/engine/tools/radiant/MainFrm.cpp
index acef15f9..45dded94 100644
--- a/neo/engine/tools/radiant/MainFrm.cpp
+++ b/neo/engine/tools/radiant/MainFrm.cpp
@@ -48,6 +48,7 @@ If you have questions concerning this license or the applicable additional terms
 #include "DialogThick.h"
 #include "PatchDialog.h"
 #include "Undo.h"
+#include "Terrain.h"
 #include "NewTexWnd.h"
 #include "splines.h"
 #include "dlgcamera.h"
@@ -5502,6 +5503,10 @@ void CMainFrame::OnEditPastebrush() {
  */
 void CMainFrame::OnEditUndo() {
 	// if (ActiveXY()) ActiveXY()->Undo();
+	if (Terrain_UndoAvailable() && (Terrain_IsEditMode() || !Undo_UndoAvailable())) {
+		Terrain_Undo();
+		return;
+	}
 	Undo_Undo();
 }
 
@@ -5510,6 +5515,10 @@ void CMainFrame::OnEditUndo() {
  =======================================================================================================================
  */
 void CMainFrame::OnEditRedo() {
+	if (Terrain_RedoAvailable() && (Terrain_IsEditMode() || !Undo_RedoAvailable())) {
+		Terrain_Redo();
+		return;
+	}
 	Undo_Redo();
 }
 
@@ -5522,7 +5531,7 @@ void CMainFrame::OnUpdateEditUndo(CCmdUI* pCmdUI) {
 	 * BOOL bEnable = false; if (ActiveXY()) bEnable = ActiveXY()->UndoAvailable();
 	 * pCmdUI->Enable(bEnable);
 	 */
-	pCmdUI->Enable(Undo_UndoAvailable());
+	pCmdUI->Enable(Undo_UndoAvailable() || Terrain_UndoAvailable());
 }
 
 /*
@@ -5530,7 +5539,7 @@ void CMainFrame::OnUpdateEditUndo(CCmdUI* pCmdUI) {
  =======================================================================================================================
  */
 void CMainFrame::OnUpdateEditRedo(CCmdUI* pCmdUI) {
-	pCmdUI->Enable(Undo_RedoAvailable());
+	pCmdUI->Enable(Undo_RedoAvailable() || Terrain_RedoAvailable());
 }
 
 /*
diff --git a/neo/engine/tools/radiant/RadiantGLText.h b/neo/engine/tools/radiant/RadiantGLText.h
new file mode 100644
index 00000000..be6fc936
--- /dev/null
+++ b/neo/engine/tools/radiant/RadiantGLText.h
@@ -0,0 +1,181 @@
+/*
+===========================================================================
+
+IceTech GPL Source Code
+Copyright (C) 2026 Justin Marshall
+
+This file is part of the IceTech GPL Source Code.
+
+===========================================================================
+*/
+
+#ifndef __RADIANTGLTEXT_H__
+#define __RADIANTGLTEXT_H__
+
+static ID_INLINE const unsigned char* RadiantGLText_GlyphRows(char c) {
+	static const unsigned char glyphBlank[7] = { 0, 0, 0, 0, 0, 0, 0 };
+	static const unsigned char glyph0[7] = { 14, 17, 19, 21, 25, 17, 14 };
+	static const unsigned char glyph1[7] = { 4, 12, 4, 4, 4, 4, 14 };
+	static const unsigned char glyph2[7] = { 14, 17, 1, 2, 4, 8, 31 };
+	static const unsigned char glyph3[7] = { 30, 1, 1, 14, 1, 1, 30 };
+	static const unsigned char glyph4[7] = { 2, 6, 10, 18, 31, 2, 2 };
+	static const unsigned char glyph5[7] = { 31, 16, 16, 30, 1, 1, 30 };
+	static const unsigned char glyph6[7] = { 14, 16, 16, 30, 17, 17, 14 };
+	static const unsigned char glyph7[7] = { 31, 1, 2, 4, 8, 8, 8 };
+	static const unsigned char glyph8[7] = { 14, 17, 17, 14, 17, 17, 14 };
+	static const unsigned char glyph9[7] = { 14, 17, 17, 15, 1, 1, 14 };
+	static const unsigned char glyphA[7] = { 14, 17, 17, 31, 17, 17, 17 };
+	static const unsigned char glyphB[7] = { 30, 17, 17, 30, 17, 17, 30 };
+	static const unsigned char glyphC[7] = { 14, 17, 16, 16, 16, 17, 14 };
+	static const unsigned char glyphD[7] = { 30, 17, 17, 17, 17, 17, 30 };
+	static const unsigned char glyphE[7] = { 31, 16, 16, 30, 16, 16, 31 };
+	static const unsigned char glyphF[7] = { 31, 16, 16, 30, 16, 16, 16 };
+	static const unsigned char glyphG[7] = { 14, 17, 16, 23, 17, 17, 14 };
+	static const unsigned char glyphH[7] = { 17, 17, 17, 31, 17, 17, 17 };
+	static const unsigned char glyphI[7] = { 14, 4, 4, 4, 4, 4, 14 };
+	static const unsigned char glyphJ[7] = { 7, 2, 2, 2, 18, 18, 12 };
+	static const unsigned char glyphK[7] = { 17, 18, 20, 24, 20, 18, 17 };
+	static const unsigned char glyphL[7] = { 16, 16, 16, 16, 16, 16, 31 };
+	static const unsigned char glyphM[7] = { 17, 27, 21, 21, 17, 17, 17 };
+	static const unsigned char glyphN[7] = { 17, 25, 21, 19, 17, 17, 17 };
+	static const unsigned char glyphO[7] = { 14, 17, 17, 17, 17, 17, 14 };
+	static const unsigned char glyphP[7] = { 30, 17, 17, 30, 16, 16, 16 };
+	static const unsigned char glyphQ[7] = { 14, 17, 17, 17, 21, 18, 13 };
+	static const unsigned char glyphR[7] = { 30, 17, 17, 30, 20, 18, 17 };
+	static const unsigned char glyphS[7] = { 15, 16, 16, 14, 1, 1, 30 };
+	static const unsigned char glyphT[7] = { 31, 4, 4, 4, 4, 4, 4 };
+	static const unsigned char glyphU[7] = { 17, 17, 17, 17, 17, 17, 14 };
+	static const unsigned char glyphV[7] = { 17, 17, 17, 17, 17, 10, 4 };
+	static const unsigned char glyphW[7] = { 17, 17, 17, 21, 21, 21, 10 };
+	static const unsigned char glyphX[7] = { 17, 17, 10, 4, 10, 17, 17 };
+	static const unsigned char glyphY[7] = { 17, 17, 10, 4, 4, 4, 4 };
+	static const unsigned char glyphZ[7] = { 31, 1, 2, 4, 8, 16, 31 };
+	static const unsigned char glyphColon[7] = { 0, 4, 4, 0, 4, 4, 0 };
+	static const unsigned char glyphXChar[7] = { 0, 0, 17, 10, 4, 10, 17 };
+	static const unsigned char glyphSlash[7] = { 1, 1, 2, 4, 8, 16, 16 };
+	static const unsigned char glyphBackslash[7] = { 16, 16, 8, 4, 2, 1, 1 };
+	static const unsigned char glyphDot[7] = { 0, 0, 0, 0, 0, 12, 12 };
+	static const unsigned char glyphDash[7] = { 0, 0, 0, 31, 0, 0, 0 };
+	static const unsigned char glyphUnderscore[7] = { 0, 0, 0, 0, 0, 0, 31 };
+
+	if (c >= 'a' && c <= 'z' && c != 'x') {
+		c = c - 'a' + 'A';
+	}
+	switch (c) {
+	case '0': return glyph0;
+	case '1': return glyph1;
+	case '2': return glyph2;
+	case '3': return glyph3;
+	case '4': return glyph4;
+	case '5': return glyph5;
+	case '6': return glyph6;
+	case '7': return glyph7;
+	case '8': return glyph8;
+	case '9': return glyph9;
+	case 'A': return glyphA;
+	case 'B': return glyphB;
+	case 'C': return glyphC;
+	case 'D': return glyphD;
+	case 'E': return glyphE;
+	case 'F': return glyphF;
+	case 'G': return glyphG;
+	case 'H': return glyphH;
+	case 'I': return glyphI;
+	case 'J': return glyphJ;
+	case 'K': return glyphK;
+	case 'L': return glyphL;
+	case 'M': return glyphM;
+	case 'N': return glyphN;
+	case 'O': return glyphO;
+	case 'P': return glyphP;
+	case 'Q': return glyphQ;
+	case 'R': return glyphR;
+	case 'S': return glyphS;
+	case 'T': return glyphT;
+	case 'U': return glyphU;
+	case 'V': return glyphV;
+	case 'W': return glyphW;
+	case 'X': return glyphX;
+	case 'x': return glyphXChar;
+	case 'Y': return glyphY;
+	case 'Z': return glyphZ;
+	case ':': return glyphColon;
+	case '/': return glyphSlash;
+	case '\\': return glyphBackslash;
+	case '.': return glyphDot;
+	case '-': return glyphDash;
+	case '_': return glyphUnderscore;
+	default: return glyphBlank;
+	}
+}
+
+static ID_INLINE float RadiantGLText_Abs(float value) {
+	return (value < 0.0f) ? -value : value;
+}
+
+static ID_INLINE float RadiantGLText_Width(const char* text, float scale) {
+	if (!text || !text[0]) {
+		return 0.0f;
+	}
+	return (float)strlen(text) * 6.0f * RadiantGLText_Abs(scale);
+}
+
+static ID_INLINE float RadiantGLText_Height(float scale) {
+	return 7.0f * RadiantGLText_Abs(scale);
+}
+
+static ID_INLINE void RadiantGLText_DrawScaled(const char* text, float x, float y, float xScale, float yScale) {
+	if (!text || !text[0]) {
+		return;
+	}
+
+	const float glyphAdvance = 6.0f * RadiantGLText_Abs(xScale);
+	float penX = x;
+
+	glBegin(GL_QUADS);
+	for (const char* p = text; *p; p++) {
+		const char c = *p;
+		if (c == ' ') {
+			penX += glyphAdvance;
+			continue;
+		}
+
+		const unsigned char* rows = RadiantGLText_GlyphRows(c);
+		for (int row = 0; row < 7; row++) {
+			for (int col = 0; col < 5; col++) {
+				if (!(rows[row] & (1 << (4 - col)))) {
+					continue;
+				}
+
+				const float x0 = penX + col * xScale;
+				const float y0 = y + row * yScale;
+				const float x1 = x0 + xScale;
+				const float y1 = y0 + yScale;
+				glVertex2f(x0, y0);
+				glVertex2f(x1, y0);
+				glVertex2f(x1, y1);
+				glVertex2f(x0, y1);
+			}
+		}
+		penX += glyphAdvance;
+	}
+	glEnd();
+}
+
+static ID_INLINE void RadiantGLText_Draw(const char* text, float x, float y, float scale) {
+	RadiantGLText_DrawScaled(text, x, y, scale, scale);
+}
+
+static ID_INLINE void RadiantGLText_DrawCentered(const char* text, float centerX, float centerY, float scale) {
+	const float x = centerX - RadiantGLText_Width(text, scale) * 0.5f;
+	const float y = centerY - RadiantGLText_Height(scale) * 0.5f;
+	RadiantGLText_Draw(text, x, y, scale);
+}
+
+static ID_INLINE void RadiantGLText_DrawCenteredYUp(const char* text, float centerX, float centerY, float scale) {
+	const float x = centerX - RadiantGLText_Width(text, scale) * 0.5f;
+	const float y = centerY + RadiantGLText_Height(scale) * 0.5f;
+	RadiantGLText_DrawScaled(text, x, y, scale, -scale);
+}
+
+#endif // __RADIANTGLTEXT_H__
diff --git a/neo/engine/tools/radiant/Terrain.cpp b/neo/engine/tools/radiant/Terrain.cpp
new file mode 100644
index 00000000..3ea71792
--- /dev/null
+++ b/neo/engine/tools/radiant/Terrain.cpp
@@ -0,0 +1,1569 @@
+/*
+===========================================================================
+
+Radiant terrain authoring
+
+This is editor source data only.  The heightfields draw live in Radiant and are
+saved beside the map as .terrain files; later bake/export code can consume the
+same data without coupling sculpting to runtime geometry.
+
+===========================================================================
+*/
+
+#include "precompiled.h"
+#pragma hdrstop
+
+#include "qe3.h"
+#include "CamWnd.h"
+#include "Terrain.h"
+#include "../../models/TerrainModel.h"
+
+#include <math.h>
+
+#define TERRAIN_DEFAULT_RADIUS		256.0f
+#define TERRAIN_DEFAULT_STRENGTH	96.0f
+#define TERRAIN_DEFAULT_PAINT_STRENGTH	2.0f
+#define TERRAIN_MAX_BRUSH_RADIUS	4096.0f
+#define TERRAIN_MIN_BRUSH_RADIUS	8.0f
+#define TERRAIN_MAX_BRUSH_STRENGTH	4096.0f
+#define TERRAIN_MIN_BRUSH_STRENGTH	1.0f
+#define TERRAIN_MAX_PAINT_STRENGTH	20.0f
+#define TERRAIN_MIN_PAINT_STRENGTH	0.05f
+
+typedef enum terrainToolMode_s {
+	TERRAIN_TOOL_SCULPT,
+	TERRAIN_TOOL_PAINT
+} terrainToolMode_t;
+
+typedef idTerrainPatch terrainObject_t;
+
+typedef struct terrainStrokeChange_s {
+	int		sample;
+	bool	heightChanged;
+	float	oldHeight;
+	float	newHeight;
+	bool	weightChanged;
+	idVec4	oldWeight;
+	idVec4	newWeight;
+} terrainStrokeChange_t;
+
+typedef struct terrainUndo_s {
+	int		terrainIndex;
+	idList<terrainStrokeChange_t> changes;
+} terrainUndo_t;
+
+typedef struct terrainStroke_s {
+	bool	active;
+	int		terrainIndex;
+	terrainToolMode_t toolMode;
+	int		lastTime;
+	idList<terrainStrokeChange_t> changes;
+} terrainStroke_t;
+
+static idTerrainModel				s_terrainModel;
+#define s_terrains					s_terrainModel.Terrains()
+static idList<terrainUndo_t *>		s_undoStack;
+static idList<terrainUndo_t *>		s_redoStack;
+static terrainStroke_t				s_stroke;
+static bool							s_editMode = false;
+static bool							s_cursorValid = false;
+static int							s_cursorTerrainIndex = -1;
+static idVec3						s_cursorHit;
+static idVec3						s_cursorNormal;
+static terrainToolMode_t			s_toolMode = TERRAIN_TOOL_SCULPT;
+static int							s_paintLayer = 1;
+static float						s_brushRadius = TERRAIN_DEFAULT_RADIUS;
+static float						s_brushStrength = TERRAIN_DEFAULT_STRENGTH;
+static float						s_paintStrength = TERRAIN_DEFAULT_PAINT_STRENGTH;
+
+static void Terrain_ClearUndoStacks(void) {
+	s_undoStack.DeleteContents(true);
+	s_redoStack.DeleteContents(true);
+	s_stroke.active = false;
+	s_stroke.terrainIndex = -1;
+	s_stroke.toolMode = TERRAIN_TOOL_SCULPT;
+	s_stroke.lastTime = 0;
+	s_stroke.changes.Clear();
+}
+
+static idStr Terrain_FileName(const char *mapFileName) {
+	idStr fileName = mapFileName && mapFileName[0] ? mapFileName : currentmap;
+	return idTerrainModel::FileNameForMap(fileName.c_str());
+}
+
+static int Terrain_SampleIndex(const terrainObject_t *terrain, int x, int y) {
+	return terrain->SampleIndex(x, y);
+}
+
+static int Terrain_PaintIndex(const terrainObject_t *terrain, int x, int y) {
+	return terrain->PaintIndex(x, y);
+}
+
+static void Terrain_MarkPaintTextureDirty(terrainObject_t *terrain) {
+	if (terrain) {
+		terrain->MarkPaintTextureDirty();
+	}
+}
+
+static void Terrain_ClearPaintTextureDirtyRect(terrainObject_t *terrain) {
+	if (terrain) {
+		terrain->ClearPaintTextureDirtyRect();
+	}
+}
+
+static void Terrain_MarkPaintTextureDirtyRect(terrainObject_t *terrain, int minX, int minY, int maxX, int maxY) {
+	if (terrain) {
+		terrain->MarkPaintTextureDirtyRect(minX, minY, maxX, maxY);
+	}
+}
+
+static float Terrain_SampleHeight(const terrainObject_t *terrain, int x, int y) {
+	return terrain->SampleHeight(x, y);
+}
+
+static idVec4 Terrain_BaseLayerWeight(void) {
+	return idTerrainPatch::BaseLayerWeight();
+}
+
+static idVec4 Terrain_NormalizeLayerWeight(const idVec4 &weight) {
+	return idTerrainPatch::NormalizeLayerWeight(weight);
+}
+
+static float Terrain_WorldWidth(const terrainObject_t *terrain) {
+	return terrain->WorldWidth();
+}
+
+static float Terrain_WorldHeight(const terrainObject_t *terrain) {
+	return terrain->WorldHeight();
+}
+
+static float Terrain_BilinearHeight(const terrainObject_t *terrain, float u, float v) {
+	return terrain->BilinearHeight(u, v);
+}
+
+static idVec3 Terrain_VertexUV(const terrainObject_t *terrain, float u, float v) {
+	return terrain->VertexUV(u, v);
+}
+
+static idVec3 Terrain_Vertex(const terrainObject_t *terrain, int x, int y) {
+	return terrain->Vertex(x, y);
+}
+
+static idVec3 Terrain_VertexNormal(const terrainObject_t *terrain, int x, int y) {
+	return terrain->VertexNormal(x, y);
+}
+
+static void Terrain_UpdateBounds(terrainObject_t *terrain) {
+	if (terrain) {
+		terrain->UpdateBounds();
+	}
+}
+
+static const char *Terrain_DefaultMaterial(void) {
+	const char *selected = g_qeglobals.d_texturewin.texdef.name;
+	if (selected && selected[0] && selected[0] != '(') {
+		return selected;
+	}
+	return "textures/common/caulk";
+}
+
+static void Terrain_EnsureLayerData(terrainObject_t *terrain) {
+	if (terrain) {
+		terrain->EnsureLayerData(Terrain_DefaultMaterial());
+	}
+}
+
+static idVec4 Terrain_SamplePaintWeight(const terrainObject_t *terrain, int x, int y) {
+	return terrain->SamplePaintWeight(x, y);
+}
+
+static terrainObject_t *Terrain_NewDefault(const idVec3 &center) {
+	return s_terrainModel.AllocDefaultTerrain(center, Terrain_DefaultMaterial(), (float)g_qeglobals.d_gridsize);
+}
+
+static void Terrain_FreeGLResources(terrainObject_t *terrain) {
+	if (!terrain || terrain->paintTexture == 0) {
+		return;
+	}
+	GLuint texture = terrain->paintTexture;
+	glDeleteTextures(1, &texture);
+	terrain->paintTexture = 0;
+	Terrain_MarkPaintTextureDirty(terrain);
+}
+
+void Terrain_Clear(void) {
+	for (int i = 0; i < s_terrains.Num(); i++) {
+		Terrain_FreeGLResources(s_terrains[i]);
+	}
+	s_terrainModel.Clear();
+	Terrain_ClearUndoStacks();
+	s_cursorValid = false;
+	s_cursorTerrainIndex = -1;
+}
+
+int Terrain_NumTerrains(void) {
+	return s_terrains.Num();
+}
+
+bool Terrain_IsEditMode(void) {
+	return s_editMode;
+}
+
+void Terrain_SetEditMode(bool enabled) {
+	if (s_editMode == enabled) {
+		return;
+	}
+	s_editMode = enabled;
+	s_cursorValid = false;
+	Sys_Status(enabled ? "Terrain edit mode enabled\n" : "Terrain edit mode disabled\n", 0);
+	Sys_UpdateWindows(W_ALL);
+}
+
+void Terrain_ToggleEditMode(void) {
+	Terrain_SetEditMode(!s_editMode);
+}
+
+void Terrain_CreateDefaultAtCamera(CCamWnd *cam) {
+	idVec3 center;
+	if (cam) {
+		center = cam->Camera().origin;
+	} else {
+		center.Zero();
+	}
+	center.z = 0.0f;
+	terrainObject_t *terrain = Terrain_NewDefault(center);
+	s_terrains.Append(terrain);
+	Terrain_SetEditMode(true);
+	mapModified = 1;
+	Sys_Status(va("Created terrain %s (%ix%i)\n", terrain->name.c_str(), terrain->width, terrain->height), 0);
+	Sys_UpdateWindows(W_ALL);
+}
+
+static bool Terrain_RayTriangle(const idVec3 &origin, const idVec3 &dir, const idVec3 &v0, const idVec3 &v1, const idVec3 &v2, float &dist, idVec3 &normal) {
+	const float epsilon = 0.0001f;
+	idVec3 edge1 = v1 - v0;
+	idVec3 edge2 = v2 - v0;
+	idVec3 pvec = dir.Cross(edge2);
+	float det = edge1 * pvec;
+	if (fabs(det) < epsilon) {
+		return false;
+	}
+
+	float invDet = 1.0f / det;
+	idVec3 tvec = origin - v0;
+	float u = (tvec * pvec) * invDet;
+	if (u < 0.0f || u > 1.0f) {
+		return false;
+	}
+
+	idVec3 qvec = tvec.Cross(edge1);
+	float v = (dir * qvec) * invDet;
+	if (v < 0.0f || u + v > 1.0f) {
+		return false;
+	}
+
+	dist = (edge2 * qvec) * invDet;
+	if (dist <= epsilon) {
+		return false;
+	}
+
+	normal = edge1.Cross(edge2);
+	if (normal.LengthSqr() > epsilon) {
+		normal.Normalize();
+		if ((normal * dir) > 0.0f) {
+			normal *= -1.0f;
+		}
+	}
+	else {
+		normal.Set(0.0f, 0.0f, 1.0f);
+	}
+	return true;
+}
+
+static bool Terrain_RayBounds(const terrainObject_t *terrain, const idVec3 &origin, const idVec3 &dir) {
+	float tMin = 0.0f;
+	float tMax = HUGE_DISTANCE;
+	for (int axis = 0; axis < 3; axis++) {
+		const float min = terrain->bounds[0][axis] - s_brushRadius;
+		const float max = terrain->bounds[1][axis] + s_brushRadius;
+		if (fabs(dir[axis]) < 0.00001f) {
+			if (origin[axis] < min || origin[axis] > max) {
+				return false;
+			}
+			continue;
+		}
+		float invD = 1.0f / dir[axis];
+		float t0 = (min - origin[axis]) * invD;
+		float t1 = (max - origin[axis]) * invD;
+		if (t0 > t1) {
+			float tmp = t0;
+			t0 = t1;
+			t1 = tmp;
+		}
+		if (t0 > tMin) {
+			tMin = t0;
+		}
+		if (t1 < tMax) {
+			tMax = t1;
+		}
+		if (tMax < tMin) {
+			return false;
+		}
+	}
+	return true;
+}
+
+static bool Terrain_RayTrace(const idVec3 &origin, const idVec3 &dir, int &terrainIndex, idVec3 &hit, idVec3 &normal) {
+	float bestDist = HUGE_DISTANCE;
+	int bestTerrain = -1;
+	idVec3 bestNormal;
+
+	for (int i = 0; i < s_terrains.Num(); i++) {
+		terrainObject_t *terrain = s_terrains[i];
+		if (!terrain || terrain->width < 2 || terrain->height < 2) {
+			continue;
+		}
+		if (!Terrain_RayBounds(terrain, origin, dir)) {
+			continue;
+		}
+
+		for (int y = 0; y < terrain->height - 1; y++) {
+			for (int x = 0; x < terrain->width - 1; x++) {
+				idVec3 v00 = Terrain_Vertex(terrain, x, y);
+				idVec3 v10 = Terrain_Vertex(terrain, x + 1, y);
+				idVec3 v01 = Terrain_Vertex(terrain, x, y + 1);
+				idVec3 v11 = Terrain_Vertex(terrain, x + 1, y + 1);
+				float dist;
+				idVec3 triNormal;
+				if (Terrain_RayTriangle(origin, dir, v00, v10, v11, dist, triNormal) && dist < bestDist) {
+					bestDist = dist;
+					bestTerrain = i;
+					bestNormal = triNormal;
+				}
+				if (Terrain_RayTriangle(origin, dir, v00, v11, v01, dist, triNormal) && dist < bestDist) {
+					bestDist = dist;
+					bestTerrain = i;
+					bestNormal = triNormal;
+				}
+			}
+		}
+	}
+
+	if (bestTerrain < 0) {
+		return false;
+	}
+
+	terrainIndex = bestTerrain;
+	hit = origin + dir * bestDist;
+	normal = bestNormal;
+	return true;
+}
+
+static void Terrain_BuildCameraRay(CCamWnd *cam, const CPoint &point, idVec3 &origin, idVec3 &dir) {
+	CRect rect;
+	cam->GetClientRect(rect);
+	camera_t &camera = cam->Camera();
+	const int x = point.x;
+	const int y = rect.bottom - 1 - point.y;
+
+	float r = 0.0f;
+	float u = 0.0f;
+	if (camera.width > 0) {
+		r = (float)(x - camera.width / 2) / (camera.width / 2);
+		u = (float)(y - camera.height / 2) / (camera.width / 2);
+	}
+
+	origin = camera.origin;
+	for (int i = 0; i < 3; i++) {
+		dir[i] = camera.vpn[i] + camera.vright[i] * r + camera.vup[i] * u;
+	}
+	dir.Normalize();
+}
+
+static bool Terrain_UpdateCursor(CCamWnd *cam, const CPoint &point) {
+	if (!cam || !Terrain_IsEditMode()) {
+		s_cursorValid = false;
+		s_cursorTerrainIndex = -1;
+		return false;
+	}
+
+	idVec3 origin;
+	idVec3 dir;
+	Terrain_BuildCameraRay(cam, point, origin, dir);
+
+	int terrainIndex;
+	idVec3 hit;
+	idVec3 normal;
+	if (!Terrain_RayTrace(origin, dir, terrainIndex, hit, normal)) {
+		s_cursorValid = false;
+		s_cursorTerrainIndex = -1;
+		return false;
+	}
+
+	s_cursorValid = true;
+	s_cursorTerrainIndex = terrainIndex;
+	s_cursorHit = hit;
+	s_cursorNormal = normal;
+	return true;
+}
+
+static int Terrain_FindStrokeChange(int sample) {
+	for (int i = 0; i < s_stroke.changes.Num(); i++) {
+		if (s_stroke.changes[i].sample == sample) {
+			return i;
+		}
+	}
+	return -1;
+}
+
+static void Terrain_RecordStrokeChange(int sample, float oldHeight, float newHeight) {
+	int existing = Terrain_FindStrokeChange(sample);
+	if (existing >= 0) {
+		s_stroke.changes[existing].heightChanged = true;
+		s_stroke.changes[existing].newHeight = newHeight;
+		return;
+	}
+
+	terrainStrokeChange_t change;
+	change.sample = sample;
+	change.heightChanged = true;
+	change.oldHeight = oldHeight;
+	change.newHeight = newHeight;
+	change.weightChanged = false;
+	change.oldWeight = Terrain_BaseLayerWeight();
+	change.newWeight = Terrain_BaseLayerWeight();
+	s_stroke.changes.Append(change);
+}
+
+static void Terrain_RecordPaintChange(int sample, const idVec4 &oldWeight, const idVec4 &newWeight) {
+	int existing = Terrain_FindStrokeChange(sample);
+	if (existing >= 0) {
+		s_stroke.changes[existing].weightChanged = true;
+		s_stroke.changes[existing].newWeight = newWeight;
+		return;
+	}
+
+	terrainStrokeChange_t change;
+	change.sample = sample;
+	change.heightChanged = false;
+	change.oldHeight = 0.0f;
+	change.newHeight = 0.0f;
+	change.weightChanged = true;
+	change.oldWeight = oldWeight;
+	change.newWeight = newWeight;
+	s_stroke.changes.Append(change);
+}
+
+static void Terrain_ApplyBrushAt(int terrainIndex, const idVec3 &hit, float seconds, bool lower) {
+	if (terrainIndex < 0 || terrainIndex >= s_terrains.Num()) {
+		return;
+	}
+
+	terrainObject_t *terrain = s_terrains[terrainIndex];
+	if (!terrain) {
+		return;
+	}
+
+	if (seconds <= 0.0f) {
+		seconds = 0.025f;
+	}
+	else if (seconds > 0.1f) {
+		seconds = 0.1f;
+	}
+
+	const float sign = lower ? -1.0f : 1.0f;
+	const float amount = sign * s_brushStrength * seconds;
+	const float radiusSqr = s_brushRadius * s_brushRadius;
+
+	for (int y = 0; y < terrain->height; y++) {
+		for (int x = 0; x < terrain->width; x++) {
+			idVec3 v = Terrain_Vertex(terrain, x, y);
+			idVec2 delta(v.x - hit.x, v.y - hit.y);
+			float distSqr = delta.LengthSqr();
+			if (distSqr > radiusSqr) {
+				continue;
+			}
+
+			float dist = sqrt(distSqr);
+			float t = 1.0f - idMath::ClampFloat(0.0f, 1.0f, dist / s_brushRadius);
+			float falloff = t * t * (3.0f - 2.0f * t);
+			int sample = Terrain_SampleIndex(terrain, x, y);
+			float oldHeight = terrain->heights[sample];
+			float newHeight = oldHeight + amount * falloff;
+			if (newHeight == oldHeight) {
+				continue;
+			}
+			terrain->SetHeight(x, y, newHeight);
+			Terrain_RecordStrokeChange(sample, oldHeight, newHeight);
+		}
+	}
+
+	Terrain_UpdateBounds(terrain);
+	mapModified = 1;
+}
+
+static bool Terrain_WeightsDiffer(const idVec4 &a, const idVec4 &b) {
+	return idMath::Fabs(a.x - b.x) > 0.0001f ||
+		idMath::Fabs(a.y - b.y) > 0.0001f ||
+		idMath::Fabs(a.z - b.z) > 0.0001f ||
+		idMath::Fabs(a.w - b.w) > 0.0001f;
+}
+
+static void Terrain_EnsurePaintLayerMaterial(terrainObject_t *terrain, int layer) {
+	if (!terrain || layer < 0 || layer >= TERRAIN_MAX_LAYERS) {
+		return;
+	}
+	Terrain_EnsureLayerData(terrain);
+	if (!terrain->layerMaterials[layer].IsEmpty()) {
+		return;
+	}
+
+	terrain->layerMaterials[layer] = Terrain_DefaultMaterial();
+	Texture_ForName(terrain->layerMaterials[layer].c_str());
+}
+
+static idVec4 Terrain_PaintLayerWeight(const idVec4 &oldWeight, int layer, float amount, bool erase) {
+	idVec4 weight = Terrain_NormalizeLayerWeight(oldWeight);
+	amount = idMath::ClampFloat(0.0f, 1.0f, amount);
+
+	if (erase) {
+		weight[layer] = idMath::ClampFloat(0.0f, 1.0f, weight[layer] - amount);
+		return Terrain_NormalizeLayerWeight(weight);
+	}
+
+	for (int i = 0; i < TERRAIN_MAX_LAYERS; i++) {
+		weight[i] *= (1.0f - amount);
+	}
+	weight[layer] += amount;
+	return Terrain_NormalizeLayerWeight(weight);
+}
+
+static void Terrain_ApplyPaintAt(int terrainIndex, const idVec3 &hit, float seconds, bool erase) {
+	if (terrainIndex < 0 || terrainIndex >= s_terrains.Num()) {
+		return;
+	}
+
+	terrainObject_t *terrain = s_terrains[terrainIndex];
+	if (!terrain) {
+		return;
+	}
+
+	if (seconds <= 0.0f) {
+		seconds = 0.025f;
+	}
+	else if (seconds > 0.1f) {
+		seconds = 0.1f;
+	}
+
+	Terrain_EnsureLayerData(terrain);
+	Terrain_EnsurePaintLayerMaterial(terrain, s_paintLayer);
+
+	const float amount = s_paintStrength * seconds;
+	const float radiusSqr = s_brushRadius * s_brushRadius;
+	const float worldWidth = Terrain_WorldWidth(terrain);
+	const float worldHeight = Terrain_WorldHeight(terrain);
+	if (worldWidth <= 0.0f || worldHeight <= 0.0f) {
+		return;
+	}
+
+	const float invWorldWidth = 1.0f / worldWidth;
+	const float invWorldHeight = 1.0f / worldHeight;
+	const float minU = idMath::ClampFloat(0.0f, 1.0f, (hit.x - s_brushRadius - terrain->origin.x) * invWorldWidth);
+	const float maxU = idMath::ClampFloat(0.0f, 1.0f, (hit.x + s_brushRadius - terrain->origin.x) * invWorldWidth);
+	const float minV = idMath::ClampFloat(0.0f, 1.0f, (hit.y - s_brushRadius - terrain->origin.y) * invWorldHeight);
+	const float maxV = idMath::ClampFloat(0.0f, 1.0f, (hit.y + s_brushRadius - terrain->origin.y) * invWorldHeight);
+	const int minX = idMath::ClampInt(0, terrain->paintWidth - 1, (int)floorf(minU * (float)(terrain->paintWidth - 1)));
+	const int maxX = idMath::ClampInt(0, terrain->paintWidth - 1, (int)ceilf(maxU * (float)(terrain->paintWidth - 1)));
+	const int minY = idMath::ClampInt(0, terrain->paintHeight - 1, (int)floorf(minV * (float)(terrain->paintHeight - 1)));
+	const int maxY = idMath::ClampInt(0, terrain->paintHeight - 1, (int)ceilf(maxV * (float)(terrain->paintHeight - 1)));
+	bool changed = false;
+
+	for (int y = minY; y <= maxY; y++) {
+		const float v = (float)y / (float)(terrain->paintHeight - 1);
+		const float worldY = terrain->origin.y + worldHeight * v;
+		for (int x = minX; x <= maxX; x++) {
+			const float u = (float)x / (float)(terrain->paintWidth - 1);
+			const float worldX = terrain->origin.x + worldWidth * u;
+			idVec2 delta(worldX - hit.x, worldY - hit.y);
+			float distSqr = delta.LengthSqr();
+			if (distSqr > radiusSqr) {
+				continue;
+			}
+
+			float dist = sqrt(distSqr);
+			float t = 1.0f - idMath::ClampFloat(0.0f, 1.0f, dist / s_brushRadius);
+			float falloff = t * t * (3.0f - 2.0f * t);
+			int sample = Terrain_PaintIndex(terrain, x, y);
+			idVec4 oldWeight = terrain->paintWeights[sample];
+			idVec4 newWeight = Terrain_PaintLayerWeight(oldWeight, s_paintLayer, amount * falloff, erase);
+			if (!Terrain_WeightsDiffer(oldWeight, newWeight)) {
+				continue;
+			}
+			terrain->SetPaintWeight(x, y, newWeight);
+			Terrain_RecordPaintChange(sample, oldWeight, newWeight);
+			changed = true;
+		}
+	}
+
+	if (changed) {
+		Terrain_MarkPaintTextureDirtyRect(terrain, minX, minY, maxX, maxY);
+		mapModified = 1;
+	}
+}
+
+static void Terrain_BeginStroke(int terrainIndex) {
+	s_stroke.active = true;
+	s_stroke.terrainIndex = terrainIndex;
+	s_stroke.toolMode = s_toolMode;
+	s_stroke.lastTime = Sys_Milliseconds();
+	s_stroke.changes.Clear();
+}
+
+static void Terrain_EndStroke(bool keep) {
+	if (!s_stroke.active) {
+		return;
+	}
+
+	if (keep && s_stroke.changes.Num() > 0) {
+		terrainUndo_t *undo = new terrainUndo_t;
+		undo->terrainIndex = s_stroke.terrainIndex;
+		undo->changes = s_stroke.changes;
+		s_undoStack.Append(undo);
+		s_redoStack.DeleteContents(true);
+	}
+
+	s_stroke.active = false;
+	s_stroke.terrainIndex = -1;
+	s_stroke.lastTime = 0;
+	s_stroke.changes.Clear();
+}
+
+static bool Terrain_StrokeApplyAtCursor(CCamWnd *cam, const CPoint &point, UINT flags, bool forceFirstSample) {
+	if (!s_stroke.active) {
+		return false;
+	}
+
+	if (!Terrain_UpdateCursor(cam, point)) {
+		return true;
+	}
+
+	int terrainIndex;
+	idVec3 origin;
+	idVec3 dir;
+	idVec3 hit;
+	idVec3 normal;
+	Terrain_BuildCameraRay(cam, point, origin, dir);
+	if (!Terrain_RayTrace(origin, dir, terrainIndex, hit, normal)) {
+		return true;
+	}
+	if (terrainIndex != s_stroke.terrainIndex) {
+		return true;
+	}
+
+	int now = Sys_Milliseconds();
+	float seconds = forceFirstSample ? 0.05f : (now - s_stroke.lastTime) * 0.001f;
+	s_stroke.lastTime = now;
+
+	const bool lower = (flags & MK_SHIFT) != 0 || (GetAsyncKeyState(VK_SHIFT) & 0x8000) != 0;
+	if (s_stroke.toolMode == TERRAIN_TOOL_PAINT) {
+		Terrain_ApplyPaintAt(terrainIndex, hit, seconds, lower);
+	}
+	else {
+		Terrain_ApplyBrushAt(terrainIndex, hit, seconds, lower);
+	}
+	Sys_UpdateWindows(W_ALL);
+	return true;
+}
+
+bool Terrain_LButtonDown(CCamWnd *cam, const CPoint &point, UINT flags) {
+	if (!Terrain_IsEditMode() || !cam) {
+		return false;
+	}
+	if (s_terrains.Num() <= 0) {
+		return false;
+	}
+
+	if (!Terrain_UpdateCursor(cam, point)) {
+		return false;
+	}
+
+	idVec3 origin;
+	idVec3 dir;
+	idVec3 hit;
+	idVec3 normal;
+	int terrainIndex;
+	Terrain_BuildCameraRay(cam, point, origin, dir);
+	if (!Terrain_RayTrace(origin, dir, terrainIndex, hit, normal)) {
+		return false;
+	}
+
+	cam->SetFocus();
+	cam->SetCapture();
+	Terrain_BeginStroke(terrainIndex);
+	Terrain_StrokeApplyAtCursor(cam, point, flags, true);
+	return true;
+}
+
+bool Terrain_LButtonUp(CCamWnd *cam, const CPoint &point, UINT flags) {
+	if (!s_stroke.active) {
+		return false;
+	}
+	Terrain_StrokeApplyAtCursor(cam, point, flags, false);
+	Terrain_EndStroke(true);
+	if (cam && ::GetCapture() == cam->GetSafeHwnd()) {
+		::ReleaseCapture();
+	}
+	Sys_UpdateWindows(W_ALL);
+	return true;
+}
+
+void Terrain_CancelStroke(void) {
+	if (!s_stroke.active) {
+		return;
+	}
+	Terrain_EndStroke(false);
+	s_cursorValid = false;
+	Sys_UpdateWindows(W_CAMERA);
+}
+
+bool Terrain_MouseMove(CCamWnd *cam, const CPoint &point, UINT flags) {
+	if (s_stroke.active) {
+		return Terrain_StrokeApplyAtCursor(cam, point, flags, false);
+	}
+	if (!Terrain_IsEditMode()) {
+		return false;
+	}
+	bool hadCursor = s_cursorValid;
+	bool hasCursor = Terrain_UpdateCursor(cam, point);
+	if (hadCursor != hasCursor || hasCursor) {
+		if (cam) {
+			cam->InvalidateRect(NULL, FALSE);
+		}
+	}
+	return false;
+}
+
+static const char *Terrain_ToolName(void) {
+	return s_toolMode == TERRAIN_TOOL_PAINT ? "paint" : "sculpt";
+}
+
+static void Terrain_SetToolMode(terrainToolMode_t mode) {
+	if (s_toolMode == mode) {
+		return;
+	}
+	s_toolMode = mode;
+	Sys_Status(va("Terrain %s mode\n", Terrain_ToolName()), 0);
+	Sys_UpdateWindows(W_CAMERA);
+}
+
+static void Terrain_ToggleToolMode(void) {
+	Terrain_SetToolMode(s_toolMode == TERRAIN_TOOL_PAINT ? TERRAIN_TOOL_SCULPT : TERRAIN_TOOL_PAINT);
+}
+
+bool Terrain_IsPaintMode(void) {
+	return s_toolMode == TERRAIN_TOOL_PAINT;
+}
+
+void Terrain_SetPaintMode(bool enabled) {
+	Terrain_SetToolMode(enabled ? TERRAIN_TOOL_PAINT : TERRAIN_TOOL_SCULPT);
+}
+
+int Terrain_GetPaintLayer(void) {
+	return s_paintLayer;
+}
+
+static terrainObject_t *Terrain_TargetForLayerDialog(void) {
+	if (s_cursorTerrainIndex >= 0 && s_cursorTerrainIndex < s_terrains.Num()) {
+		return s_terrains[s_cursorTerrainIndex];
+	}
+	if (s_terrains.Num() > 0) {
+		return s_terrains[0];
+	}
+	return NULL;
+}
+
+void Terrain_SelectPaintLayer(int layer) {
+	s_paintLayer = idMath::ClampInt(0, TERRAIN_MAX_LAYERS - 1, layer);
+	Sys_Status(va("Terrain paint layer %i\n", s_paintLayer + 1), 0);
+	Sys_UpdateWindows(W_CAMERA);
+}
+
+static idStr Terrain_CleanMaterialName(const char *materialName) {
+	idStr cleaned = materialName ? materialName : "";
+	cleaned.StripTrailingWhitespace();
+	cleaned.Strip(' ');
+	cleaned.Strip('\t');
+	cleaned.StripQuotes();
+	return cleaned;
+}
+
+static bool Terrain_SetLayerMaterials(terrainObject_t *terrain, const idStr layerMaterials[TERRAIN_MAX_LAYERS]) {
+	if (!terrain) {
+		return false;
+	}
+
+	Terrain_EnsureLayerData(terrain);
+	idStr oldLayerMaterials[TERRAIN_MAX_LAYERS];
+	for (int layer = 0; layer < TERRAIN_MAX_LAYERS; layer++) {
+		oldLayerMaterials[layer] = terrain->layerMaterials[layer];
+	}
+
+	const bool changed = terrain->SetLayerMaterials(layerMaterials, Terrain_DefaultMaterial());
+	for (int layer = 0; layer < TERRAIN_MAX_LAYERS; layer++) {
+		if (!terrain->layerMaterials[layer].IsEmpty() && oldLayerMaterials[layer].Icmp(terrain->layerMaterials[layer].c_str()) != 0) {
+			Texture_ForName(terrain->layerMaterials[layer].c_str());
+		}
+	}
+
+	if (changed) {
+		mapModified = 1;
+		Sys_UpdateWindows(W_ALL);
+	}
+
+	return changed;
+}
+
+enum {
+	TERRAIN_LAYER_DLG_EDIT_BASE = 7000,
+	TERRAIN_LAYER_DLG_USE_SELECTED_BASE = 7010,
+	TERRAIN_LAYER_DLG_CLEAR_BASE = 7020
+};
+
+typedef struct terrainLayerDialogState_s {
+	terrainObject_t *terrain;
+	HWND owner;
+	HWND dialog;
+	HWND edits[TERRAIN_MAX_LAYERS];
+	bool accepted;
+	bool changed;
+} terrainLayerDialogState_t;
+
+static void Terrain_SetDialogFont(HWND hWnd, HFONT font) {
+	if (hWnd && font) {
+		SendMessage(hWnd, WM_SETFONT, (WPARAM)font, TRUE);
+	}
+}
+
+static HWND Terrain_CreateDialogControl(terrainLayerDialogState_t *state, const char *className, const char *text, DWORD style, int id, int x, int y, int w, int h, HFONT font) {
+	HWND control = CreateWindowExA(
+		(strcmp(className, "EDIT") == 0) ? WS_EX_CLIENTEDGE : 0,
+		className,
+		text,
+		WS_CHILD | WS_VISIBLE | style,
+		x,
+		y,
+		w,
+		h,
+		state->dialog,
+		(HMENU)(INT_PTR)id,
+		GetModuleHandle(NULL),
+		NULL);
+	Terrain_SetDialogFont(control, font);
+	return control;
+}
+
+static void TerrainLayerDialog_FillEdits(terrainLayerDialogState_t *state) {
+	if (!state || !state->terrain) {
+		return;
+	}
+	Terrain_EnsureLayerData(state->terrain);
+	for (int layer = 0; layer < TERRAIN_MAX_LAYERS; layer++) {
+		SetWindowTextA(state->edits[layer], state->terrain->layerMaterials[layer].c_str());
+	}
+}
+
+static void TerrainLayerDialog_Apply(terrainLayerDialogState_t *state) {
+	if (!state || !state->terrain) {
+		return;
+	}
+
+	idStr layerMaterials[TERRAIN_MAX_LAYERS];
+	for (int layer = 0; layer < TERRAIN_MAX_LAYERS; layer++) {
+		char text[MAX_OSPATH];
+		text[0] = '\0';
+		GetWindowTextA(state->edits[layer], text, sizeof(text));
+		layerMaterials[layer] = Terrain_CleanMaterialName(text);
+	}
+
+	state->changed = Terrain_SetLayerMaterials(state->terrain, layerMaterials);
+	state->accepted = true;
+	DestroyWindow(state->dialog);
+}
+
+static LRESULT CALLBACK TerrainLayerDialogProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
+	terrainLayerDialogState_t *state = (terrainLayerDialogState_t *)GetWindowLongPtr(hWnd, GWLP_USERDATA);
+
+	switch (uMsg) {
+	case WM_NCCREATE:
+		state = (terrainLayerDialogState_t *)((CREATESTRUCT *)lParam)->lpCreateParams;
+		SetWindowLongPtr(hWnd, GWLP_USERDATA, (LONG_PTR)state);
+		return TRUE;
+
+	case WM_CREATE:
+	{
+		state->dialog = hWnd;
+		HFONT font = (HFONT)GetStockObject(DEFAULT_GUI_FONT);
+		Terrain_SetDialogFont(hWnd, font);
+
+		Terrain_CreateDialogControl(state, "STATIC", state->terrain ? state->terrain->name.c_str() : "", SS_LEFT, -1, 14, 12, 360, 18, font);
+		for (int layer = 0; layer < TERRAIN_MAX_LAYERS; layer++) {
+			const int y = 42 + layer * 30;
+			Terrain_CreateDialogControl(state, "STATIC", va("Layer %i", layer + 1), SS_LEFT, -1, 14, y + 4, 58, 18, font);
+			state->edits[layer] = Terrain_CreateDialogControl(state, "EDIT", "", ES_AUTOHSCROLL, TERRAIN_LAYER_DLG_EDIT_BASE + layer, 74, y, 288, 22, font);
+			Terrain_CreateDialogControl(state, "BUTTON", "Use selected", BS_PUSHBUTTON, TERRAIN_LAYER_DLG_USE_SELECTED_BASE + layer, 370, y, 88, 22, font);
+			HWND clearButton = Terrain_CreateDialogControl(state, "BUTTON", "Clear", BS_PUSHBUTTON, TERRAIN_LAYER_DLG_CLEAR_BASE + layer, 466, y, 56, 22, font);
+			if (layer == 0) {
+				EnableWindow(clearButton, FALSE);
+			}
+		}
+
+		Terrain_CreateDialogControl(state, "BUTTON", "OK", BS_DEFPUSHBUTTON, IDOK, 342, 174, 82, 24, font);
+		Terrain_CreateDialogControl(state, "BUTTON", "Cancel", BS_PUSHBUTTON, IDCANCEL, 436, 174, 82, 24, font);
+		TerrainLayerDialog_FillEdits(state);
+		SetFocus(state->edits[0]);
+		return 0;
+	}
+
+	case WM_COMMAND:
+	{
+		const int command = LOWORD(wParam);
+		if (command == IDOK) {
+			TerrainLayerDialog_Apply(state);
+			return 0;
+		}
+		if (command == IDCANCEL) {
+			DestroyWindow(hWnd);
+			return 0;
+		}
+		if (command >= TERRAIN_LAYER_DLG_USE_SELECTED_BASE && command < TERRAIN_LAYER_DLG_USE_SELECTED_BASE + TERRAIN_MAX_LAYERS) {
+			int layer = command - TERRAIN_LAYER_DLG_USE_SELECTED_BASE;
+			SetWindowTextA(state->edits[layer], Terrain_DefaultMaterial());
+			return 0;
+		}
+		if (command >= TERRAIN_LAYER_DLG_CLEAR_BASE && command < TERRAIN_LAYER_DLG_CLEAR_BASE + TERRAIN_MAX_LAYERS) {
+			int layer = command - TERRAIN_LAYER_DLG_CLEAR_BASE;
+			if (layer > 0) {
+				SetWindowTextA(state->edits[layer], "");
+			}
+			return 0;
+		}
+		break;
+	}
+
+	case WM_CLOSE:
+		DestroyWindow(hWnd);
+		return 0;
+
+	case WM_DESTROY:
+		if (state && state->owner && IsWindow(state->owner)) {
+			EnableWindow(state->owner, TRUE);
+			SetActiveWindow(state->owner);
+		}
+		return 0;
+	}
+
+	return DefWindowProc(hWnd, uMsg, wParam, lParam);
+}
+
+static ATOM TerrainLayerDialog_RegisterClass(void) {
+	static ATOM atom = 0;
+	if (atom) {
+		return atom;
+	}
+
+	WNDCLASSA wc;
+	memset(&wc, 0, sizeof(wc));
+	wc.style = CS_DBLCLKS;
+	wc.lpfnWndProc = TerrainLayerDialogProc;
+	wc.hInstance = GetModuleHandle(NULL);
+	wc.hCursor = LoadCursor(NULL, IDC_ARROW);
+	wc.hbrBackground = (HBRUSH)(COLOR_BTNFACE + 1);
+	wc.lpszClassName = "RadiantTerrainLayerDialog";
+	atom = RegisterClassA(&wc);
+	return atom;
+}
+
+bool Terrain_ShowLayersDialog(CCamWnd *cam) {
+	terrainObject_t *terrain = Terrain_TargetForLayerDialog();
+	if (!terrain) {
+		Sys_Status("Create a terrain before editing terrain layers\n", 0);
+		return false;
+	}
+
+	Terrain_EnsureLayerData(terrain);
+	if (!TerrainLayerDialog_RegisterClass()) {
+		common->Warning("Terrain_ShowLayersDialog: failed to register dialog class");
+		return false;
+	}
+
+	HWND owner = cam && cam->GetSafeHwnd() ? cam->GetSafeHwnd() : (g_pParentWnd ? g_pParentWnd->GetSafeHwnd() : NULL);
+	terrainLayerDialogState_t state;
+	memset(&state, 0, sizeof(state));
+	state.terrain = terrain;
+	state.owner = owner;
+
+	RECT ownerRect = { 0, 0, 0, 0 };
+	if (owner && IsWindow(owner)) {
+		GetWindowRect(owner, &ownerRect);
+	}
+	else {
+		ownerRect.left = 200;
+		ownerRect.top = 150;
+		ownerRect.right = 800;
+		ownerRect.bottom = 550;
+	}
+
+	const int width = 540;
+	const int height = 236;
+	const int x = ownerRect.left + ((ownerRect.right - ownerRect.left) - width) / 2;
+	const int y = ownerRect.top + ((ownerRect.bottom - ownerRect.top) - height) / 2;
+
+	if (owner) {
+		EnableWindow(owner, FALSE);
+	}
+
+	HWND dialog = CreateWindowExA(
+		WS_EX_DLGMODALFRAME | WS_EX_WINDOWEDGE,
+		"RadiantTerrainLayerDialog",
+		"Terrain Layers",
+		WS_POPUP | WS_CAPTION | WS_SYSMENU,
+		x,
+		y,
+		width,
+		height,
+		owner,
+		NULL,
+		GetModuleHandle(NULL),
+		&state);
+	if (!dialog) {
+		if (owner) {
+			EnableWindow(owner, TRUE);
+		}
+		common->Warning("Terrain_ShowLayersDialog: failed to create dialog");
+		return false;
+	}
+
+	ShowWindow(dialog, SW_SHOW);
+	UpdateWindow(dialog);
+
+	MSG msg;
+	while (IsWindow(dialog) && GetMessage(&msg, NULL, 0, 0) > 0) {
+		if (!IsDialogMessage(dialog, &msg)) {
+			TranslateMessage(&msg);
+			DispatchMessage(&msg);
+		}
+	}
+
+	if (owner && IsWindow(owner)) {
+		EnableWindow(owner, TRUE);
+		SetActiveWindow(owner);
+	}
+
+	if (state.accepted && state.changed) {
+		Sys_Status("Terrain layers updated\n", 0);
+	}
+	return state.changed;
+}
+
+void Terrain_AdjustBrushRadius(float scale) {
+	s_brushRadius *= scale;
+	s_brushRadius = idMath::ClampFloat(TERRAIN_MIN_BRUSH_RADIUS, TERRAIN_MAX_BRUSH_RADIUS, s_brushRadius);
+	Sys_Status(va("Terrain radius %.1f\n", s_brushRadius), 0);
+	Sys_UpdateWindows(W_CAMERA);
+}
+
+void Terrain_AdjustBrushStrength(float scale) {
+	if (s_toolMode == TERRAIN_TOOL_PAINT) {
+		s_paintStrength *= scale;
+		s_paintStrength = idMath::ClampFloat(TERRAIN_MIN_PAINT_STRENGTH, TERRAIN_MAX_PAINT_STRENGTH, s_paintStrength);
+		Sys_Status(va("Terrain paint flow %.2f\n", s_paintStrength), 0);
+		Sys_UpdateWindows(W_CAMERA);
+		return;
+	}
+
+	s_brushStrength *= scale;
+	s_brushStrength = idMath::ClampFloat(TERRAIN_MIN_BRUSH_STRENGTH, TERRAIN_MAX_BRUSH_STRENGTH, s_brushStrength);
+	Sys_Status(va("Terrain strength %.1f\n", s_brushStrength), 0);
+	Sys_UpdateWindows(W_CAMERA);
+}
+
+bool Terrain_HandleKeyDown(CCamWnd *cam, UINT key) {
+	const bool ctrl = (GetAsyncKeyState(VK_CONTROL) & 0x8000) != 0;
+	const bool shift = (GetAsyncKeyState(VK_SHIFT) & 0x8000) != 0;
+	const bool alt = (GetAsyncKeyState(VK_MENU) & 0x8000) != 0;
+
+	if (!alt && key == 'T') {
+		if (ctrl || shift || s_terrains.Num() <= 0) {
+			Terrain_CreateDefaultAtCamera(cam);
+		}
+		else {
+			Terrain_ToggleEditMode();
+		}
+		return true;
+	}
+
+	if (!Terrain_IsEditMode()) {
+		return false;
+	}
+
+	if (!alt && key == 'P') {
+		Terrain_ToggleToolMode();
+		return true;
+	}
+	if (!alt && key >= '1' && key <= '4') {
+		const int layer = key - '1';
+		Terrain_SelectPaintLayer(layer);
+		return true;
+	}
+	if (!alt && key >= VK_NUMPAD1 && key <= VK_NUMPAD4) {
+		const int layer = key - VK_NUMPAD1;
+		Terrain_SelectPaintLayer(layer);
+		return true;
+	}
+	if (key == VK_OEM_4) {
+		Terrain_AdjustBrushRadius(0.8f);
+		return true;
+	}
+	if (key == VK_OEM_6) {
+		Terrain_AdjustBrushRadius(1.25f);
+		return true;
+	}
+	if (key == VK_SUBTRACT || key == VK_OEM_MINUS) {
+		Terrain_AdjustBrushStrength(0.8f);
+		return true;
+	}
+	if (key == VK_ADD || key == VK_OEM_PLUS) {
+		Terrain_AdjustBrushStrength(1.25f);
+		return true;
+	}
+
+	return false;
+}
+
+bool Terrain_HandleChar(CCamWnd *cam, UINT key) {
+	if (!Terrain_IsEditMode()) {
+		return false;
+	}
+	switch (key) {
+	case '[':
+	case '{':
+		Terrain_AdjustBrushRadius(0.8f);
+		return true;
+	case ']':
+	case '}':
+		Terrain_AdjustBrushRadius(1.25f);
+		return true;
+	case '-':
+	case '_':
+		Terrain_AdjustBrushStrength(0.8f);
+		return true;
+	case '+':
+	case '=':
+		Terrain_AdjustBrushStrength(1.25f);
+		return true;
+	}
+	return false;
+}
+
+static idImage *Terrain_LayerEditorImage(const char *materialName) {
+	if (!materialName || !materialName[0]) {
+		return NULL;
+	}
+
+	const idMaterial *material = Texture_ForName(materialName);
+	if (!material || material->TestMaterialFlag(MF_DEFAULTED)) {
+		return NULL;
+	}
+
+	return material->GetEditorImage();
+}
+
+static idImage *Terrain_LayerNormalImage(const char *materialName) {
+	idImage *flatNormal = globalImages->flatNormalMap ? globalImages->flatNormalMap : globalImages->whiteImage;
+	if (!materialName || !materialName[0]) {
+		return flatNormal;
+	}
+
+	const idMaterial *material = Texture_ForName(materialName);
+	if (!material || material->TestMaterialFlag(MF_DEFAULTED)) {
+		return flatNormal;
+	}
+
+	const shaderStage_t *bumpStage = material->GetBumpStage();
+	if (!bumpStage || !bumpStage->texture.image) {
+		return flatNormal;
+	}
+
+	return bumpStage->texture.image;
+}
+
+static byte Terrain_WeightToByte(float value) {
+	return (byte)idMath::ClampInt(0, 255, (int)floorf(idMath::ClampFloat(0.0f, 1.0f, value) * 255.0f + 0.5f));
+}
+
+static void Terrain_FillPaintPixels(terrainObject_t *terrain, int minX, int minY, int uploadWidth, int uploadHeight, idList<byte> &pixels) {
+	pixels.SetNum(uploadWidth * uploadHeight * 4);
+	for (int y = 0; y < uploadHeight; y++) {
+		for (int x = 0; x < uploadWidth; x++) {
+			const int sample = Terrain_PaintIndex(terrain, minX + x, minY + y);
+			const int pixel = (y * uploadWidth + x) * 4;
+			const idVec4 weights = Terrain_NormalizeLayerWeight(terrain->paintWeights[sample]);
+			pixels[pixel + 0] = Terrain_WeightToByte(weights.x);
+			pixels[pixel + 1] = Terrain_WeightToByte(weights.y);
+			pixels[pixel + 2] = Terrain_WeightToByte(weights.z);
+			pixels[pixel + 3] = Terrain_WeightToByte(weights.w);
+		}
+	}
+}
+
+static GLuint Terrain_UpdatePaintTexture(terrainObject_t *terrain) {
+	Terrain_EnsureLayerData(terrain);
+	bool newTexture = false;
+	if (terrain->paintTexture == 0) {
+		glGenTextures(1, &terrain->paintTexture);
+		Terrain_MarkPaintTextureDirty(terrain);
+		newTexture = true;
+	}
+
+	if (!terrain->paintTextureDirty) {
+		return terrain->paintTexture;
+	}
+
+	const int minX = idMath::ClampInt(0, terrain->paintWidth - 1, terrain->paintDirtyMinX);
+	const int minY = idMath::ClampInt(0, terrain->paintHeight - 1, terrain->paintDirtyMinY);
+	const int maxX = idMath::ClampInt(0, terrain->paintWidth - 1, terrain->paintDirtyMaxX);
+	const int maxY = idMath::ClampInt(0, terrain->paintHeight - 1, terrain->paintDirtyMaxY);
+	const bool validRect = maxX >= minX && maxY >= minY;
+	const bool fullUpload = newTexture || !validRect ||
+		(minX == 0 && minY == 0 && maxX == terrain->paintWidth - 1 && maxY == terrain->paintHeight - 1);
+	const int uploadX = fullUpload ? 0 : minX;
+	const int uploadY = fullUpload ? 0 : minY;
+	const int uploadWidth = fullUpload ? terrain->paintWidth : (maxX - minX + 1);
+	const int uploadHeight = fullUpload ? terrain->paintHeight : (maxY - minY + 1);
+
+	glBindTexture(GL_TEXTURE_2D, terrain->paintTexture);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+	idList<byte> pixels;
+	Terrain_FillPaintPixels(terrain, uploadX, uploadY, uploadWidth, uploadHeight, pixels);
+	if (fullUpload) {
+		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, terrain->paintWidth, terrain->paintHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels.Ptr());
+	}
+	else {
+		glTexSubImage2D(GL_TEXTURE_2D, 0, uploadX, uploadY, uploadWidth, uploadHeight, GL_RGBA, GL_UNSIGNED_BYTE, pixels.Ptr());
+	}
+
+	Terrain_ClearPaintTextureDirtyRect(terrain);
+	return terrain->paintTexture;
+}
+
+static void Terrain_BindLayerTextures(terrainObject_t *terrain) {
+	Terrain_EnsureLayerData(terrain);
+
+	idImage *baseImage = Terrain_LayerEditorImage(terrain->layerMaterials[0].c_str());
+	if (!baseImage) {
+		baseImage = globalImages->whiteImage;
+	}
+
+	for (int layer = 0; layer < TERRAIN_MAX_LAYERS; layer++) {
+		idImage *image = Terrain_LayerEditorImage(terrain->layerMaterials[layer].c_str());
+		if (!image) {
+			image = baseImage;
+		}
+
+		image->Bind();
+		glTerrainLayerTextureQD3D12(layer, image->texnum);
+
+		idImage *normalImage = Terrain_LayerNormalImage(terrain->layerMaterials[layer].c_str());
+		if (!normalImage) {
+			normalImage = globalImages->flatNormalMap ? globalImages->flatNormalMap : globalImages->whiteImage;
+		}
+		normalImage->Bind();
+		glTerrainLayerNormalTextureQD3D12(layer, normalImage->texnum);
+	}
+	glTerrainWeightTextureQD3D12(Terrain_UpdatePaintTexture(terrain));
+}
+
+static void Terrain_ClearLayerTextureBindings(void) {
+	glTerrainBlendEnableQD3D12(GL_FALSE);
+	glTerrainBlendOpacityQD3D12(1.0f);
+	glTerrainWeightTextureQD3D12(0);
+	for (int layer = 0; layer < TERRAIN_MAX_LAYERS; layer++) {
+		glTerrainLayerTextureQD3D12(layer, 0);
+		glTerrainLayerNormalTextureQD3D12(layer, 0);
+	}
+}
+
+static void Terrain_SubmitTexturedVertex(terrainObject_t *terrain, int x, int y) {
+	idVec3 v = Terrain_Vertex(terrain, x, y);
+	idVec3 normal = Terrain_VertexNormal(terrain, x, y);
+	const float u = (float)x / (float)(terrain->width - 1);
+	const float vCoord = (float)y / (float)(terrain->height - 1);
+	const float layerS = Terrain_WorldWidth(terrain) * u / 256.0f;
+	const float layerT = Terrain_WorldHeight(terrain) * vCoord / 256.0f;
+	const int paintX = idMath::ClampInt(0, terrain->paintWidth - 1, (int)floorf(u * (float)(terrain->paintWidth - 1) + 0.5f));
+	const int paintY = idMath::ClampInt(0, terrain->paintHeight - 1, (int)floorf(vCoord * (float)(terrain->paintHeight - 1) + 0.5f));
+	const idVec4 weights = Terrain_NormalizeLayerWeight(Terrain_SamplePaintWeight(terrain, paintX, paintY));
+
+	glColor4fv(weights.ToFloatPtr());
+	glNormal3fv(normal.ToFloatPtr());
+	glMultiTexCoord2fARB(GL_TEXTURE0_ARB, layerS, layerT);
+	glMultiTexCoord2fARB(GL_TEXTURE1_ARB, u, vCoord);
+	glVertex3fv(v.ToFloatPtr());
+}
+
+static idVec4 Terrain_PaintLayerColor(void) {
+	static const idVec4 colors[TERRAIN_MAX_LAYERS] = {
+		idVec4(0.95f, 0.80f, 0.10f, 1.0f),
+		idVec4(0.10f, 0.75f, 1.0f, 1.0f),
+		idVec4(0.15f, 0.95f, 0.35f, 1.0f),
+		idVec4(0.95f, 0.25f, 0.85f, 1.0f)
+	};
+	return colors[idMath::ClampInt(0, TERRAIN_MAX_LAYERS - 1, s_paintLayer)];
+}
+
+static void Terrain_DrawObjectCam(terrainObject_t *terrain, bool selected) {
+	if (!terrain || terrain->width < 2 || terrain->height < 2) {
+		return;
+	}
+
+	Terrain_EnsureLayerData(terrain);
+
+	glPushAttrib(GL_ALL_ATTRIB_BITS);
+	glEnable(GL_DEPTH_TEST);
+	glDepthFunc(GL_LEQUAL);
+	glDepthMask(GL_TRUE);
+	glDisable(GL_CULL_FACE);
+	glEnable(GL_BLEND);
+	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+	glEnable(GL_TEXTURE_2D);
+	Terrain_BindLayerTextures(terrain);
+	glTerrainBlendEnableQD3D12(GL_TRUE);
+	glTerrainBlendOpacityQD3D12(selected ? 0.85f : 0.72f);
+
+	glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+	for (int y = 0; y < terrain->height - 1; y++) {
+		glBegin(GL_TRIANGLE_STRIP);
+		for (int x = 0; x < terrain->width; x++) {
+			Terrain_SubmitTexturedVertex(terrain, x, y);
+			Terrain_SubmitTexturedVertex(terrain, x, y + 1);
+		}
+		glEnd();
+	}
+	Terrain_ClearLayerTextureBindings();
+
+	glDisable(GL_TEXTURE_2D);
+	globalImages->BindNull();
+	glDisable(GL_BLEND);
+	glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+	glLineWidth(selected ? 1.5f : 0.5f);
+	glColor4f(selected ? 1.0f : 0.45f, selected ? 0.82f : 0.62f, selected ? 0.08f : 0.50f, 1.0f);
+	glBegin(GL_LINES);
+	for (int y = 0; y < terrain->height; y++) {
+		for (int x = 0; x < terrain->width - 1; x++) {
+			idVec3 a = Terrain_Vertex(terrain, x, y);
+			idVec3 b = Terrain_Vertex(terrain, x + 1, y);
+			glVertex3fv(a.ToFloatPtr());
+			glVertex3fv(b.ToFloatPtr());
+		}
+	}
+	for (int x = 0; x < terrain->width; x++) {
+		for (int y = 0; y < terrain->height - 1; y++) {
+			idVec3 a = Terrain_Vertex(terrain, x, y);
+			idVec3 b = Terrain_Vertex(terrain, x, y + 1);
+			glVertex3fv(a.ToFloatPtr());
+			glVertex3fv(b.ToFloatPtr());
+		}
+	}
+	glEnd();
+
+	glDepthFunc(GL_LEQUAL);
+	glDepthMask(GL_TRUE);
+	glDisable(GL_BLEND);
+	glEnable(GL_TEXTURE_2D);
+	glPopAttrib();
+}
+
+static void Terrain_DrawBrushCursor(void) {
+	if (!s_editMode || !s_cursorValid) {
+		return;
+	}
+
+	glPushAttrib(GL_ALL_ATTRIB_BITS);
+	glDisable(GL_TEXTURE_2D);
+	glDisable(GL_DEPTH_TEST);
+	glLineWidth(2.0f);
+	idVec4 cursorColor = s_toolMode == TERRAIN_TOOL_PAINT ? Terrain_PaintLayerColor() : idVec4(0.08f, 0.75f, 1.0f, 1.0f);
+	glColor4f(cursorColor.x, cursorColor.y, cursorColor.z, cursorColor.w);
+	globalImages->BindNull();
+
+	const int segments = 64;
+	glBegin(GL_LINE_LOOP);
+	for (int i = 0; i < segments; i++) {
+		float a = (float)i * idMath::TWO_PI / (float)segments;
+		idVec3 p;
+		p.x = s_cursorHit.x + cos(a) * s_brushRadius;
+		p.y = s_cursorHit.y + sin(a) * s_brushRadius;
+		p.z = s_cursorHit.z + 2.0f;
+		glVertex3fv(p.ToFloatPtr());
+	}
+	glEnd();
+
+	glBegin(GL_LINES);
+	idVec3 normalEnd = s_cursorHit + s_cursorNormal * idMath::ClampFloat(12.0f, 64.0f, s_brushRadius * 0.25f);
+	glVertex3fv(s_cursorHit.ToFloatPtr());
+	glVertex3fv(normalEnd.ToFloatPtr());
+	glEnd();
+
+	glEnable(GL_DEPTH_TEST);
+	glDepthFunc(GL_LEQUAL);
+	glDepthMask(GL_TRUE);
+	glDisable(GL_BLEND);
+	glEnable(GL_TEXTURE_2D);
+	glPopAttrib();
+}
+
+void Terrain_DrawCam(CCamWnd *cam) {
+	for (int i = 0; i < s_terrains.Num(); i++) {
+		Terrain_DrawObjectCam(s_terrains[i], s_editMode);
+	}
+	Terrain_DrawBrushCursor();
+}
+
+void Terrain_DrawXY(int viewType) {
+	glPushAttrib(GL_ALL_ATTRIB_BITS);
+	glDisable(GL_TEXTURE_2D);
+	glDisable(GL_BLEND);
+	globalImages->BindNull();
+	glLineWidth(s_editMode ? 1.0f : 0.5f);
+	glColor3f(s_editMode ? 0.95f : 0.45f, s_editMode ? 0.72f : 0.56f, s_editMode ? 0.08f : 0.32f);
+
+	for (int i = 0; i < s_terrains.Num(); i++) {
+		terrainObject_t *terrain = s_terrains[i];
+		if (!terrain || terrain->width < 2 || terrain->height < 2) {
+			continue;
+		}
+		glBegin(GL_LINES);
+		for (int y = 0; y < terrain->height; y++) {
+			for (int x = 0; x < terrain->width - 1; x++) {
+				idVec3 a = Terrain_Vertex(terrain, x, y);
+				idVec3 b = Terrain_Vertex(terrain, x + 1, y);
+				glVertex3fv(a.ToFloatPtr());
+				glVertex3fv(b.ToFloatPtr());
+			}
+		}
+		for (int x = 0; x < terrain->width; x++) {
+			for (int y = 0; y < terrain->height - 1; y++) {
+				idVec3 a = Terrain_Vertex(terrain, x, y);
+				idVec3 b = Terrain_Vertex(terrain, x, y + 1);
+				glVertex3fv(a.ToFloatPtr());
+				glVertex3fv(b.ToFloatPtr());
+			}
+		}
+		glEnd();
+	}
+	glPopAttrib();
+}
+
+bool Terrain_UndoAvailable(void) {
+	return s_undoStack.Num() > 0;
+}
+
+bool Terrain_RedoAvailable(void) {
+	return s_redoStack.Num() > 0;
+}
+
+static void Terrain_ApplyUndo(terrainUndo_t *undo, bool redo) {
+	if (!undo || undo->terrainIndex < 0 || undo->terrainIndex >= s_terrains.Num()) {
+		return;
+	}
+	terrainObject_t *terrain = s_terrains[undo->terrainIndex];
+	if (!terrain) {
+		return;
+	}
+	Terrain_EnsureLayerData(terrain);
+	for (int i = 0; i < undo->changes.Num(); i++) {
+		const terrainStrokeChange_t &change = undo->changes[i];
+		if (change.heightChanged) {
+			if (!terrain->SetHeightBySample(change.sample, redo ? change.newHeight : change.oldHeight)) {
+				continue;
+			}
+		}
+		if (change.weightChanged) {
+			if (!terrain->SetPaintWeightBySample(change.sample, redo ? change.newWeight : change.oldWeight)) {
+				continue;
+			}
+		}
+	}
+	Terrain_UpdateBounds(terrain);
+	mapModified = 1;
+	Sys_UpdateWindows(W_ALL);
+}
+
+bool Terrain_Undo(void) {
+	if (!Terrain_UndoAvailable()) {
+		return false;
+	}
+	terrainUndo_t *undo = s_undoStack[s_undoStack.Num() - 1];
+	s_undoStack.RemoveIndex(s_undoStack.Num() - 1);
+	Terrain_ApplyUndo(undo, false);
+	s_redoStack.Append(undo);
+	Sys_Status("Terrain undo\n", 0);
+	return true;
+}
+
+bool Terrain_Redo(void) {
+	if (!Terrain_RedoAvailable()) {
+		return false;
+	}
+	terrainUndo_t *undo = s_redoStack[s_redoStack.Num() - 1];
+	s_redoStack.RemoveIndex(s_redoStack.Num() - 1);
+	Terrain_ApplyUndo(undo, true);
+	s_undoStack.Append(undo);
+	Sys_Status("Terrain redo\n", 0);
+	return true;
+}
+
+void Terrain_Save(const char *mapFileName) {
+	idStr terrainFile = Terrain_FileName(mapFileName);
+	s_terrainModel.SaveFile(terrainFile.c_str());
+}
+
+static void Terrain_TouchLayerMaterials(terrainObject_t *terrain) {
+	if (!terrain) {
+		return;
+	}
+	Terrain_EnsureLayerData(terrain);
+	for (int layer = 0; layer < TERRAIN_MAX_LAYERS; layer++) {
+		if (!terrain->layerMaterials[layer].IsEmpty()) {
+			Texture_ForName(terrain->layerMaterials[layer].c_str());
+		}
+	}
+}
+
+void Terrain_Load(const char *mapFileName) {
+	Terrain_Clear();
+
+	idStr terrainFile = Terrain_FileName(mapFileName);
+	if (!s_terrainModel.LoadFile(terrainFile.c_str(), Terrain_DefaultMaterial())) {
+		return;
+	}
+
+	for (int i = 0; i < s_terrains.Num(); i++) {
+		terrainObject_t *terrain = s_terrains[i];
+		if (!terrain) {
+			continue;
+		}
+		terrain->paintTexture = 0;
+		Terrain_MarkPaintTextureDirty(terrain);
+		Terrain_TouchLayerMaterials(terrain);
+	}
+
+	Terrain_ClearUndoStacks();
+	s_cursorValid = false;
+	s_cursorTerrainIndex = -1;
+}
diff --git a/neo/engine/tools/radiant/Terrain.h b/neo/engine/tools/radiant/Terrain.h
new file mode 100644
index 00000000..e3d6ede6
--- /dev/null
+++ b/neo/engine/tools/radiant/Terrain.h
@@ -0,0 +1,48 @@
+/*
+===========================================================================
+
+Radiant terrain authoring
+
+Editor-only heightfield terrain source data, live drawing, camera sculpt input,
+and sidecar persistence.
+
+===========================================================================
+*/
+#ifndef __RADIANT_TERRAIN_H__
+#define __RADIANT_TERRAIN_H__
+
+class CCamWnd;
+
+void Terrain_Clear(void);
+void Terrain_Load(const char *mapFileName);
+void Terrain_Save(const char *mapFileName);
+
+bool Terrain_IsEditMode(void);
+void Terrain_SetEditMode(bool enabled);
+void Terrain_ToggleEditMode(void);
+bool Terrain_IsPaintMode(void);
+void Terrain_SetPaintMode(bool enabled);
+int Terrain_GetPaintLayer(void);
+void Terrain_SelectPaintLayer(int layer);
+int Terrain_NumTerrains(void);
+void Terrain_CreateDefaultAtCamera(CCamWnd *cam);
+bool Terrain_ShowLayersDialog(CCamWnd *cam);
+
+bool Terrain_HandleKeyDown(CCamWnd *cam, UINT key);
+bool Terrain_HandleChar(CCamWnd *cam, UINT key);
+bool Terrain_MouseMove(CCamWnd *cam, const CPoint &point, UINT flags);
+bool Terrain_LButtonDown(CCamWnd *cam, const CPoint &point, UINT flags);
+bool Terrain_LButtonUp(CCamWnd *cam, const CPoint &point, UINT flags);
+void Terrain_CancelStroke(void);
+
+void Terrain_DrawCam(CCamWnd *cam);
+void Terrain_DrawXY(int viewType);
+
+void Terrain_AdjustBrushRadius(float scale);
+void Terrain_AdjustBrushStrength(float scale);
+bool Terrain_UndoAvailable(void);
+bool Terrain_RedoAvailable(void);
+bool Terrain_Undo(void);
+bool Terrain_Redo(void);
+
+#endif
diff --git a/neo/engine/tools/radiant/XYWnd.cpp b/neo/engine/tools/radiant/XYWnd.cpp
index 62e365a4..1b9953d4 100644
--- a/neo/engine/tools/radiant/XYWnd.cpp
+++ b/neo/engine/tools/radiant/XYWnd.cpp
@@ -32,6 +32,7 @@ If you have questions concerning this license or the applicable additional terms
 #include "qe3.h"
 #include "Radiant.h"
 #include "XYWnd.h"
+#include "Terrain.h"
 #include "ModelViewDock.h"
 #include "ZWnd.h"
 #include "DialogInfo.h"
@@ -5838,6 +5839,8 @@ void CXYWnd::XY_Draw() {
 		brush->Brush_DrawXY(m_nViewType );
 	}
 
+	Terrain_DrawXY(m_nViewType);
+
 	DrawPathLines();
 
 	// draw pointfile
diff --git a/neo/engine/ui/MinigameWindow.cpp b/neo/engine/ui/MinigameWindow.cpp
new file mode 100644
index 00000000..c9509e4e
--- /dev/null
+++ b/neo/engine/ui/MinigameWindow.cpp
@@ -0,0 +1,105 @@
+/*
+===========================================================================
+
+IceTech GPL Source Code
+Copyright (C) 2026 Justin Marshall
+
+This file is part of the IceTech GPL Source Code.
+
+===========================================================================
+*/
+
+#include "precompiled.h"
+#pragma hdrstop
+
+#include "Window.h"
+#include "UserInterfaceLocal.h"
+#include "MinigameWindow.h"
+
+idMinigameWindow::idMinigameWindow( idUserInterfaceLocal *g ) : idWindow( g ) {
+	CommonInit();
+}
+
+idMinigameWindow::idMinigameWindow( idDeviceContext *d, idUserInterfaceLocal *g ) : idWindow( d, g ) {
+	CommonInit();
+}
+
+idMinigameWindow::~idMinigameWindow() {
+	instance.Shutdown();
+}
+
+void idMinigameWindow::CommonInit() {
+	minigameName = "";
+	imageName = "_minigame";
+	commandLine = "";
+	autoStart = true;
+	SetFlag( WIN_CANFOCUS | WIN_HOLDCAPTURE );
+}
+
+void idMinigameWindow::PostParse() {
+	idWindow::PostParse();
+	EnsureStarted();
+}
+
+void idMinigameWindow::EnsureStarted() {
+	if ( !autoStart || instance.IsStarted() || instance.HasFailed() || !minigameName.c_str()[0] ) {
+		return;
+	}
+	instance.Start( minigameName.c_str(), imageName.c_str(), commandLine.c_str() );
+}
+
+void idMinigameWindow::DrawBackground( const idRectangle &drawRect ) {
+	EnsureStarted();
+	instance.SetActive( true );
+	instance.UploadFramebuffer();
+	idWindow::DrawBackground( drawRect );
+}
+
+const char *idMinigameWindow::HandleEvent( const sysEvent_t *event, bool *updateVisuals ) {
+	EnsureStarted();
+	if ( instance.IsStarted() ) {
+		instance.SetActive( true );
+		instance.QueueEvent( event, gui->GetTime() );
+		if ( updateVisuals ) {
+			*updateVisuals = true;
+		}
+		return "";
+	}
+	return idWindow::HandleEvent( event, updateVisuals );
+}
+
+const char *idMinigameWindow::RouteMouseCoords( float xd, float yd ) {
+	EnsureStarted();
+	if ( instance.IsStarted() ) {
+		instance.SetActive( true );
+		sysEvent_t event = sys->GenerateMouseMoveEvent( idMath::Ftoi( xd ), idMath::Ftoi( yd ) );
+		instance.QueueEvent( &event, gui->GetTime() );
+		return "";
+	}
+	return idWindow::RouteMouseCoords( xd, yd );
+}
+
+bool idMinigameWindow::ParseInternalVar( const char *_name, idParser *src ) {
+	idStr parsedString;
+
+	if ( idStr::Icmp( _name, "minigame" ) == 0 || idStr::Icmp( _name, "module" ) == 0 ) {
+		ParseString( src, parsedString );
+		minigameName = parsedString;
+		return true;
+	}
+	if ( idStr::Icmp( _name, "image" ) == 0 ) {
+		ParseString( src, parsedString );
+		imageName = parsedString;
+		return true;
+	}
+	if ( idStr::Icmp( _name, "commandLine" ) == 0 ) {
+		ParseString( src, parsedString );
+		commandLine = parsedString;
+		return true;
+	}
+	if ( idStr::Icmp( _name, "autoStart" ) == 0 ) {
+		autoStart = src->ParseBool();
+		return true;
+	}
+	return idWindow::ParseInternalVar( _name, src );
+}
diff --git a/neo/engine/ui/MinigameWindow.h b/neo/engine/ui/MinigameWindow.h
new file mode 100644
index 00000000..8baed074
--- /dev/null
+++ b/neo/engine/ui/MinigameWindow.h
@@ -0,0 +1,40 @@
+/*
+===========================================================================
+
+IceTech GPL Source Code
+Copyright (C) 2026 Justin Marshall
+
+This file is part of the IceTech GPL Source Code.
+
+===========================================================================
+*/
+
+#ifndef __MINIGAMEWINDOW_H__
+#define __MINIGAMEWINDOW_H__
+
+#include "../minigame/MinigameHost.h"
+
+class idMinigameWindow : public idWindow {
+public:
+	idMinigameWindow( idUserInterfaceLocal *gui );
+	idMinigameWindow( idDeviceContext *d, idUserInterfaceLocal *gui );
+	virtual ~idMinigameWindow();
+
+	virtual void		PostParse();
+	virtual void		DrawBackground( const idRectangle &drawRect );
+	virtual const char *HandleEvent( const sysEvent_t *event, bool *updateVisuals );
+	virtual const char *RouteMouseCoords( float xd, float yd );
+
+private:
+	void				CommonInit();
+	virtual bool		ParseInternalVar( const char *name, idParser *src );
+	void				EnsureStarted();
+
+	idWinStr			minigameName;
+	idWinStr			imageName;
+	idWinStr			commandLine;
+	idWinBool			autoStart;
+	idMinigameInstance	instance;
+};
+
+#endif // __MINIGAMEWINDOW_H__