From f6e9f4cac7ca95b980449a0c612fd3e05c6f8c3a Mon Sep 17 00:00:00 2001
From: Bart van Strien <bart.bes+projects@gmail.com>
Date: Sun, 15 Jan 2012 11:09:38 +0100
Subject: [PATCH] Stop Body:getWorldPoints from overflowing the lua stack

---
 src/modules/physics/box2d/Body.cpp | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/modules/physics/box2d/Body.cpp b/src/modules/physics/box2d/Body.cpp
index 5397e5ce7..e4d37f40a 100644
--- a/src/modules/physics/box2d/Body.cpp
+++ b/src/modules/physics/box2d/Body.cpp
@@ -316,9 +316,14 @@ namespace box2d
 
 		for (int i = 0;i<vcount;i++)
 		{
-			float x = (float)lua_tonumber(L, i*2+1);
-			float y = (float)lua_tonumber(L, i*2+2);
+			float x = (float)lua_tonumber(L, 1);
+			float y = (float)lua_tonumber(L, 2);
+			// Remove them, so we don't run out of stack space
+			lua_remove(L, 1);
+			lua_remove(L, 1);
+			// Time for scaling
 			b2Vec2 point = Physics::scaleUp(body->GetWorldPoint(Physics::scaleDown(b2Vec2(x, y))));
+			// And then we push the result
 			lua_pushnumber(L, point.x);
 			lua_pushnumber(L, point.y);
 		}