diff --git a/neo/tools/radiant/CamWnd.cpp b/neo/tools/radiant/CamWnd.cpp
index bc30d83d..63ffba14 100644
--- a/neo/tools/radiant/CamWnd.cpp
+++ b/neo/tools/radiant/CamWnd.cpp
@@ -33,6 +33,7 @@ If you have questions concerning this license or the applicable additional terms
 #include "Radiant.h"
 #include "XYWnd.h"
 #include "CamWnd.h"
+#include "OutlinerDlg.h"
 #include "splines.h"
 #include <GL/glu.h>
 
@@ -826,6 +827,163 @@ static void CameraNav_DrawOverlay(CCamWnd* cam) {
 }
 
 
+
+/*
+========================
+Outliner-aware entity target/path lines
+
+The original DrawPathLines() does not know about the outliner visibility list.
+When no entity is hidden, keep using the original function so the normal editor
+style is unchanged.  When something is hidden, draw a filtered equivalent that
+skips links where either endpoint is hidden.
+========================
+*/
+static bool CamWnd_IsTargetLineKey(const char* key) {
+	if (key == NULL || key[0] == '\0') {
+		return false;
+	}
+
+	if (idStr::Icmp(key, "targetname") == 0) {
+		return false;
+	}
+
+	if (idStr::Icmp(key, "next") == 0) {
+		return true;
+	}
+
+	return idStr::Icmpn(key, "target", 6) == 0;
+}
+
+static bool CamWnd_EntityNameMatches(entity_t* ent, const char* name) {
+	if (ent == NULL || name == NULL || name[0] == '\0') {
+		return false;
+	}
+
+	const char* entName = ValueForKey(ent, "name");
+	if (entName != NULL && entName[0] != '\0' && idStr::Icmp(entName, name) == 0) {
+		return true;
+	}
+
+	const char* targetName = ValueForKey(ent, "targetname");
+	if (targetName != NULL && targetName[0] != '\0' && idStr::Icmp(targetName, name) == 0) {
+		return true;
+	}
+
+	return false;
+}
+
+static bool CamWnd_GetEntityLinePoint(entity_t* ent, idVec3& point) {
+	if (ent == NULL) {
+		return false;
+	}
+
+	if (GetVectorForKey(ent, "origin", point)) {
+		return true;
+	}
+
+	idBounds bounds;
+	bounds.Clear();
+	bool haveBounds = false;
+
+	for (brush_t* brush = ent->brushes.onext; brush != NULL && brush != &ent->brushes; brush = brush->onext) {
+		bounds.AddPoint(brush->mins);
+		bounds.AddPoint(brush->maxs);
+		haveBounds = true;
+	}
+
+	if (haveBounds) {
+		point = bounds.GetCenter();
+		return true;
+	}
+
+	return false;
+}
+
+static void CamWnd_DrawVisibleTargetLine(entity_t* source, entity_t* target) {
+	if (source == NULL || target == NULL || source == target) {
+		return;
+	}
+
+	if (!Outliner_IsEntityVisible(source) || !Outliner_IsEntityVisible(target)) {
+		return;
+	}
+
+	idVec3 start;
+	idVec3 end;
+	if (!CamWnd_GetEntityLinePoint(source, start) || !CamWnd_GetEntityLinePoint(target, end)) {
+		return;
+	}
+
+	glVertex3fv(start.ToFloatPtr());
+	glVertex3fv(end.ToFloatPtr());
+}
+
+static void CamWnd_DrawVisibleTargetLinesForName(entity_t* source, const char* targetName) {
+	if (targetName == NULL || targetName[0] == '\0') {
+		return;
+	}
+
+	if (world_entity != NULL && CamWnd_EntityNameMatches(world_entity, targetName)) {
+		CamWnd_DrawVisibleTargetLine(source, world_entity);
+	}
+
+	if (entities.next == NULL) {
+		return;
+	}
+
+	for (entity_t* target = entities.next; target != &entities; target = target->next) {
+		if (CamWnd_EntityNameMatches(target, targetName)) {
+			CamWnd_DrawVisibleTargetLine(source, target);
+		}
+	}
+}
+
+static void CamWnd_DrawVisibleTargetLinesForEntity(entity_t* source) {
+	if (source == NULL || !Outliner_IsEntityVisible(source)) {
+		return;
+	}
+
+	const int numKeys = source->epairs.GetNumKeyVals();
+	for (int keyIndex = 0; keyIndex < numKeys; keyIndex++) {
+		const idKeyValue* kv = source->epairs.GetKeyVal(keyIndex);
+		if (kv == NULL) {
+			continue;
+		}
+
+		if (!CamWnd_IsTargetLineKey(kv->GetKey().c_str())) {
+			continue;
+		}
+
+		CamWnd_DrawVisibleTargetLinesForName(source, kv->GetValue().c_str());
+	}
+}
+
+static void CamWnd_DrawVisiblePathLines() {
+	if (!Outliner_HasHiddenEntities()) {
+		DrawPathLines();
+		return;
+	}
+
+	glPushAttrib(GL_CURRENT_BIT);
+	globalImages->BindNull();
+	glDisable(GL_BLEND);
+	glLineWidth(1.0f);
+	glColor3f(1.0f, 0.75f, 0.0f);
+
+	glBegin(GL_LINES);
+	if (world_entity != NULL) {
+		CamWnd_DrawVisibleTargetLinesForEntity(world_entity);
+	}
+	if (entities.next != NULL) {
+		for (entity_t* source = entities.next; source != &entities; source = source->next) {
+			CamWnd_DrawVisibleTargetLinesForEntity(source);
+		}
+	}
+	glEnd();
+
+	glPopAttrib();
+}
+
 /*
 ========================
 Camera window embedded menu bar
@@ -1213,7 +1371,15 @@ static void CamWnd_UpdateRuntimeState(CCamWnd* cam, bool renderMode, bool rebuil
 }
 
 static bool CamWnd_MenuFilterBrush(CCamWnd* cam, brush_t* brush) {
-	if (!cam || !brush) {
+	if (!brush) {
+		return false;
+	}
+
+	if (brush->owner != NULL && !Outliner_IsEntityVisible(brush->owner)) {
+		return true;
+	}
+
+	if (!cam) {
 		return false;
 	}
 
@@ -2475,7 +2641,7 @@ void CCamWnd::Cam_Draw() {
 	// draw pointfile
 	glEnable(GL_DEPTH_TEST);
 
-	DrawPathLines();
+	CamWnd_DrawVisiblePathLines();
 
 	if (g_qeglobals.d_pointfile_display_list) {
 		Pointfile_Draw();
diff --git a/neo/tools/radiant/OutlinerDlg.cpp b/neo/tools/radiant/OutlinerDlg.cpp
index 1aad0606..9245efd1 100644
--- a/neo/tools/radiant/OutlinerDlg.cpp
+++ b/neo/tools/radiant/OutlinerDlg.cpp
@@ -42,6 +42,144 @@ static const int OUTLINER_FILTER_LABEL_W = 42;
 static const int OUTLINER_FILTER_H = 22;
 static const int OUTLINER_GAP = 6;
 
+
+static CPtrArray s_outlinerHiddenEntities;
+static CString s_outlinerVisibilityMapName;
+static entity_t* s_outlinerVisibilityWorldEntity = NULL;
+static entity_t* s_outlinerVisibilityFirstEntity = NULL;
+static int s_outlinerVisibilityEntityCount = -1;
+static int s_outlinerVisibilityMapModified = -999999;
+static bool s_outlinerVisibilityInitialized = false;
+
+static const char* Outliner_CurrentMapName() {
+	return currentmap ? currentmap : "";
+}
+
+static entity_t* Outliner_FirstMapEntity() {
+	if (entities.next != NULL && entities.next != &entities) {
+		return entities.next;
+	}
+	return NULL;
+}
+
+static bool Outliner_ArrayContainsPtr(const CPtrArray& array, entity_t* ent) {
+	for (int i = 0; i < array.GetSize(); i++) {
+		if ((entity_t*)array.GetAt(i) == ent) {
+			return true;
+		}
+	}
+	return false;
+}
+
+static void Outliner_ClearHiddenEntities() {
+	s_outlinerHiddenEntities.RemoveAll();
+}
+
+static void Outliner_SyncVisibilityMapIdentity() {
+	s_outlinerVisibilityInitialized = true;
+	s_outlinerVisibilityWorldEntity = world_entity;
+	s_outlinerVisibilityFirstEntity = Outliner_FirstMapEntity();
+	s_outlinerVisibilityEntityCount = g_qeglobals.d_num_entities;
+	s_outlinerVisibilityMapModified = mapModified;
+	s_outlinerVisibilityMapName = Outliner_CurrentMapName();
+}
+
+void Outliner_ResetEntityVisibility() {
+	Outliner_ClearHiddenEntities();
+	Outliner_SyncVisibilityMapIdentity();
+}
+
+static void Outliner_EnsureVisibilityMap() {
+	const char* mapName = Outliner_CurrentMapName();
+	const entity_t* firstEntity = Outliner_FirstMapEntity();
+	bool resetVisibility = false;
+
+	if (!s_outlinerVisibilityInitialized) {
+		resetVisibility = true;
+	}
+	else if (s_outlinerVisibilityWorldEntity != world_entity) {
+		resetVisibility = true;
+	}
+	else if (s_outlinerVisibilityMapName.CompareNoCase(mapName) != 0) {
+		resetVisibility = true;
+	}
+	else if (mapModified < s_outlinerVisibilityMapModified) {
+		// Loading or creating a map normally resets mapModified. Treat that as
+		// a new editor visibility session so every entity starts checked.
+		resetVisibility = true;
+	}
+	else if (mapModified <= 0 && s_outlinerVisibilityFirstEntity != firstEntity) {
+		// Some map/new-map paths reuse the same worldspawn pointer and leave
+		// currentmap empty. If the list head changed while the map is clean,
+		// this is almost certainly a freshly loaded/new map, not an edit.
+		resetVisibility = true;
+	}
+
+	if (resetVisibility) {
+		Outliner_ClearHiddenEntities();
+	}
+
+	Outliner_SyncVisibilityMapIdentity();
+}
+
+static int Outliner_FindHiddenEntity(entity_t* ent) {
+	for (int i = 0; i < s_outlinerHiddenEntities.GetSize(); i++) {
+		if ((entity_t*)s_outlinerHiddenEntities.GetAt(i) == ent) {
+			return i;
+		}
+	}
+	return -1;
+}
+
+static void Outliner_PruneHiddenEntities(const CPtrArray& currentEntities) {
+	Outliner_EnsureVisibilityMap();
+
+	for (int i = s_outlinerHiddenEntities.GetSize() - 1; i >= 0; i--) {
+		entity_t* ent = (entity_t*)s_outlinerHiddenEntities.GetAt(i);
+		if (!Outliner_ArrayContainsPtr(currentEntities, ent)) {
+			s_outlinerHiddenEntities.RemoveAt(i);
+		}
+	}
+}
+
+bool Outliner_IsEntityVisible(entity_t* ent) {
+	if (ent == NULL) {
+		return true;
+	}
+
+	Outliner_EnsureVisibilityMap();
+	return Outliner_FindHiddenEntity(ent) < 0;
+}
+
+bool Outliner_HasHiddenEntities() {
+	Outliner_EnsureVisibilityMap();
+	return s_outlinerHiddenEntities.GetSize() > 0;
+}
+
+bool Outliner_IsEntityLinkVisible(entity_t* source, entity_t* target) {
+	return Outliner_IsEntityVisible(source) && Outliner_IsEntityVisible(target);
+}
+
+void Outliner_SetEntityVisible(entity_t* ent, bool visible) {
+	if (ent == NULL) {
+		return;
+	}
+
+	Outliner_EnsureVisibilityMap();
+
+	const int index = Outliner_FindHiddenEntity(ent);
+	if (visible) {
+		if (index >= 0) {
+			s_outlinerHiddenEntities.RemoveAt(index);
+		}
+	}
+	else {
+		if (index < 0) {
+			s_outlinerHiddenEntities.Add(ent);
+		}
+	}
+}
+
 BEGIN_MESSAGE_MAP(COutlinerDlg, CWnd)
 	ON_WM_CREATE()
 	ON_WM_SIZE()
@@ -53,6 +191,8 @@ BEGIN_MESSAGE_MAP(COutlinerDlg, CWnd)
 	ON_EN_CHANGE(COutlinerDlg::IDC_OUTLINER_FILTER, OnFilterChanged)
 	ON_NOTIFY(NM_DBLCLK, COutlinerDlg::IDC_OUTLINER_TREE, OnTreeDblClick)
 	ON_NOTIFY(NM_RCLICK, COutlinerDlg::IDC_OUTLINER_TREE, OnTreeRightClick)
+	ON_NOTIFY(NM_CLICK, COutlinerDlg::IDC_OUTLINER_TREE, OnTreeClick)
+	ON_MESSAGE(COutlinerDlg::WM_OUTLINER_APPLY_CHECK, OnApplyTreeCheck)
 END_MESSAGE_MAP()
 
 COutlinerDlg::COutlinerDlg() {
@@ -133,7 +273,7 @@ int COutlinerDlg::OnCreate(LPCREATESTRUCT lpCreateStruct) {
 	m_tree.Create(
 		WS_CHILD | WS_VISIBLE | WS_TABSTOP |
 		TVS_HASBUTTONS | TVS_HASLINES | TVS_LINESATROOT |
-		TVS_SHOWSELALWAYS | TVS_DISABLEDRAGDROP,
+		TVS_SHOWSELALWAYS | TVS_DISABLEDRAGDROP | TVS_CHECKBOXES,
 		CRect(0, 0, 10, 10),
 		this,
 		IDC_OUTLINER_TREE
@@ -299,6 +439,15 @@ BOOL COutlinerDlg::PreTranslateMessage(MSG* pMsg) {
 			OpenEntityProperties(SelectedEntity());
 			return TRUE;
 		}
+
+		if (pMsg->wParam == VK_SPACE && pMsg->hwnd == m_tree.GetSafeHwnd()) {
+			entity_t* ent = SelectedEntity();
+			if (ent != NULL) {
+				ToggleEntityVisibility(ent, false);
+				return TRUE;
+			}
+		}
+
 		if (pMsg->wParam == VK_F5) {
 			Refresh(true);
 			return TRUE;
@@ -349,7 +498,30 @@ void COutlinerDlg::Refresh(bool force) {
 
 	entity_t* oldSelection = SelectedEntity();
 
+	const char* mapName = Outliner_CurrentMapName();
+	const bool hadPreviousRefresh = (m_lastMapModified != -999999);
+	const bool mapIdentityChanged =
+		(!s_outlinerVisibilityInitialized) ||
+		(m_lastWorldEntity != world_entity) ||
+		(m_lastMapName.CompareNoCase(mapName) != 0) ||
+		(hadPreviousRefresh && mapModified < m_lastMapModified) ||
+		(hadPreviousRefresh && mapModified <= 0 && s_outlinerVisibilityFirstEntity != Outliner_FirstMapEntity());
+
+	// File->New in this editor can leave the same empty map name around.
+	// When that happens, make the new map start from a clean all-visible state
+	// instead of inheriting hidden pointers from the previous contents.
+	const bool likelyNewBlankMap =
+		(s_outlinerHiddenEntities.GetSize() > 0) &&
+		(m_lastEntityCount > 1) &&
+		(g_qeglobals.d_num_entities <= 1) &&
+		(mapName[0] == '\0');
+
+	if (mapIdentityChanged || likelyNewBlankMap) {
+		Outliner_ResetEntityVisibility();
+	}
+
 	BuildGraph();
+	Outliner_PruneHiddenEntities(m_entities);
 
 	m_tree.SetRedraw(FALSE);
 	m_tree.DeleteAllItems();
@@ -383,6 +555,7 @@ void COutlinerDlg::Refresh(bool force) {
 
 		if (loopGroup == NULL) {
 			loopGroup = m_tree.InsertItem("Target loops / no root", TVI_ROOT, TVI_LAST);
+			m_tree.SetItemState(loopGroup, 0, TVIS_STATEIMAGEMASK);
 			insertedAny = true;
 		}
 
@@ -395,10 +568,14 @@ void COutlinerDlg::Refresh(bool force) {
 	}
 
 	if (!insertedAny) {
+		HTREEITEM emptyItem = NULL;
 		if (m_filterText.IsEmpty()) {
-			m_tree.InsertItem("<no entities>", TVI_ROOT, TVI_LAST);
+			emptyItem = m_tree.InsertItem("<no entities>", TVI_ROOT, TVI_LAST);
 		} else {
-			m_tree.InsertItem("<no matching entities>", TVI_ROOT, TVI_LAST);
+			emptyItem = m_tree.InsertItem("<no matching entities>", TVI_ROOT, TVI_LAST);
+		}
+		if (emptyItem != NULL) {
+			m_tree.SetItemState(emptyItem, 0, TVIS_STATEIMAGEMASK);
 		}
 	}
 
@@ -425,7 +602,7 @@ void COutlinerDlg::Refresh(bool force) {
 	m_lastWorldEntity = world_entity;
 	m_lastEntityCount = g_qeglobals.d_num_entities;
 	m_lastMapModified = mapModified;
-	m_lastMapName = currentmap;
+	m_lastMapName = Outliner_CurrentMapName();
 }
 
 void COutlinerDlg::BuildGraph() {
@@ -565,6 +742,10 @@ bool COutlinerDlg::IsTargetKey(const char* key) const {
 		return false;
 	}
 
+	if (idStr::Icmp(key, "next") == 0) {
+		return true;
+	}
+
 	return idStr::Icmpn(key, "target", 6) == 0;
 }
 
@@ -723,6 +904,7 @@ HTREEITEM COutlinerDlg::InsertEntityRecursive(entity_t* ent, HTREEITEM parent, C
 
 	HTREEITEM item = m_tree.InsertItem(label, parent, TVI_LAST);
 	m_tree.SetItemData(item, (DWORD_PTR)AllocItemData(ent, cycleRef));
+	m_tree.SetCheck(item, Outliner_IsEntityVisible(ent) ? TRUE : FALSE);
 
 	const int nodeIndex = FindNode(ent);
 	if (nodeIndex >= 0) {
@@ -787,12 +969,170 @@ void COutlinerDlg::ExpandAll(HTREEITEM start) {
 	}
 }
 
+void COutlinerDlg::OnTreeClick(NMHDR* pNMHDR, LRESULT* pResult) {
+	CPoint point;
+	::GetCursorPos(&point);
+	m_tree.ScreenToClient(&point);
+
+	UINT flags = 0;
+	HTREEITEM item = m_tree.HitTest(point, &flags);
+
+	if (item != NULL && (flags & TVHT_ONITEMSTATEICON) && EntityFromItem(item) != NULL) {
+		m_tree.SelectItem(item);
+
+		// Let the tree control finish changing the checkbox before we read it.
+		PostMessage(WM_OUTLINER_APPLY_CHECK, (WPARAM)item, 0);
+	}
+
+	*pResult = 0;
+}
+
+LRESULT COutlinerDlg::OnApplyTreeCheck(WPARAM wParam, LPARAM lParam) {
+	if (!m_tree.GetSafeHwnd()) {
+		return 0;
+	}
+
+	HTREEITEM item = (HTREEITEM)wParam;
+	if (item == NULL) {
+		return 0;
+	}
+
+	entity_t* ent = EntityFromItem(item);
+	if (ent == NULL) {
+		return 0;
+	}
+
+	const bool visible = m_tree.GetCheck(item) != FALSE;
+	Outliner_SetEntityVisible(ent, visible);
+
+	ApplyVisibilityChange();
+	return 0;
+}
+
+void COutlinerDlg::CollectEntityAndChildren(entity_t* ent, CPtrArray& out, CPtrArray& stack) const {
+	if (ent == NULL) {
+		return;
+	}
+
+	if (ArrayContains(out, ent)) {
+		return;
+	}
+
+	out.Add(ent);
+
+	if (ArrayContains(stack, ent)) {
+		return;
+	}
+
+	stack.Add(ent);
+
+	for (int i = 0; i < m_edges.GetSize(); i++) {
+		const outlinerEdge_t& edge = m_edges.GetAt(i);
+		if (edge.source != ent) {
+			continue;
+		}
+
+		CollectEntityAndChildren(edge.target, out, stack);
+	}
+
+	stack.RemoveAt(stack.GetSize() - 1);
+}
+
+void COutlinerDlg::SetEntityVisibility(entity_t* ent, bool visible, bool includeChildren) {
+	if (ent == NULL) {
+		return;
+	}
+
+	if (includeChildren) {
+		CPtrArray entitiesToChange;
+		CPtrArray stack;
+
+		CollectEntityAndChildren(ent, entitiesToChange, stack);
+
+		for (int i = 0; i < entitiesToChange.GetSize(); i++) {
+			Outliner_SetEntityVisible((entity_t*)entitiesToChange.GetAt(i), visible);
+		}
+	}
+	else {
+		Outliner_SetEntityVisible(ent, visible);
+	}
+
+	ApplyVisibilityChange();
+}
+
+void COutlinerDlg::ToggleEntityVisibility(entity_t* ent, bool includeChildren) {
+	if (ent == NULL) {
+		return;
+	}
+
+	const bool newVisible = !Outliner_IsEntityVisible(ent);
+	SetEntityVisibility(ent, newVisible, includeChildren);
+}
+
+void COutlinerDlg::ShowOnlyEntityAndChildren(entity_t* ent) {
+	if (ent == NULL) {
+		return;
+	}
+
+	CPtrArray keepVisible;
+	CPtrArray stack;
+
+	CollectEntityAndChildren(ent, keepVisible, stack);
+
+	for (int i = 0; i < m_entities.GetSize(); i++) {
+		entity_t* candidate = (entity_t*)m_entities.GetAt(i);
+		if (i == 0)
+		{
+			Outliner_SetEntityVisible(candidate, true);
+			continue;
+		}
+		Outliner_SetEntityVisible(candidate, ArrayContains(keepVisible, candidate));
+	}
+
+	ApplyVisibilityChange();
+}
+
+void COutlinerDlg::ShowAllEntities() {
+	Outliner_ResetEntityVisibility();
+	ApplyVisibilityChange();
+}
+
+void COutlinerDlg::UpdateAllCheckmarks(HTREEITEM start) {
+	HTREEITEM item = start;
+	while (item != NULL) {
+		entity_t* ent = EntityFromItem(item);
+		if (ent != NULL) {
+			m_tree.SetCheck(item, Outliner_IsEntityVisible(ent) ? TRUE : FALSE);
+		}
+
+		HTREEITEM child = m_tree.GetChildItem(item);
+		if (child != NULL) {
+			UpdateAllCheckmarks(child);
+		}
+
+		item = m_tree.GetNextSiblingItem(item);
+	}
+}
+
+void COutlinerDlg::ApplyVisibilityChange() {
+	if (m_tree.GetSafeHwnd()) {
+		m_tree.SetRedraw(FALSE);
+		UpdateAllCheckmarks(m_tree.GetRootItem());
+		m_tree.SetRedraw(TRUE);
+		m_tree.Invalidate();
+	}
+
+	Sys_UpdateWindows(W_ALL);
+}
+
 void COutlinerDlg::OnTreeDblClick(NMHDR* pNMHDR, LRESULT* pResult) {
 	OpenEntityProperties(SelectedEntity());
 	*pResult = 0;
 }
 
 void COutlinerDlg::OnTreeRightClick(NMHDR* pNMHDR, LRESULT* pResult) {
+	RefreshIfNeeded();
+
 	CPoint screenPoint;
 	::GetCursorPos(&screenPoint);
 
@@ -806,12 +1146,23 @@ void COutlinerDlg::OnTreeRightClick(NMHDR* pNMHDR, LRESULT* pResult) {
 	}
 
 	entity_t* ent = SelectedEntity();
+	const bool entVisible = Outliner_IsEntityVisible(ent);
+
+	CString toggleSelfText;
+	CString toggleChildrenText;
+	toggleSelfText.Format("%s this entity", entVisible ? "Hide" : "Show");
+	toggleChildrenText.Format("%s this entity + children", entVisible ? "Hide" : "Show");
 
 	CMenu menu;
 	menu.CreatePopupMenu();
 	menu.AppendMenu(MF_STRING | (ent ? 0 : MF_GRAYED), ID_OUTLINER_OPEN_PROPERTIES, "Open entity properties");
 	menu.AppendMenu(MF_STRING | (ent ? 0 : MF_GRAYED), ID_OUTLINER_MOVE_TO_ENTITY, "Move to entity");
 	menu.AppendMenu(MF_SEPARATOR);
+	menu.AppendMenu(MF_STRING | (ent ? 0 : MF_GRAYED), ID_OUTLINER_TOGGLE_VISIBILITY, toggleSelfText);
+	menu.AppendMenu(MF_STRING | (ent ? 0 : MF_GRAYED), ID_OUTLINER_TOGGLE_VISIBILITY_CHILDREN, toggleChildrenText);
+	menu.AppendMenu(MF_STRING | (ent ? 0 : MF_GRAYED), ID_OUTLINER_SHOW_ONLY_THIS_AND_CHILDREN, "Show only this entity + children");
+	menu.AppendMenu(MF_STRING, ID_OUTLINER_SHOW_ALL, "Show all entities");
+	menu.AppendMenu(MF_SEPARATOR);
 	menu.AppendMenu(MF_STRING, ID_OUTLINER_REFRESH, "Refresh");
 
 	const int command = menu.TrackPopupMenu(
@@ -828,6 +1179,18 @@ void COutlinerDlg::OnTreeRightClick(NMHDR* pNMHDR, LRESULT* pResult) {
 	case ID_OUTLINER_MOVE_TO_ENTITY:
 		MoveToEntity(ent);
 		break;
+	case ID_OUTLINER_TOGGLE_VISIBILITY:
+		ToggleEntityVisibility(ent, false);
+		break;
+	case ID_OUTLINER_TOGGLE_VISIBILITY_CHILDREN:
+		ToggleEntityVisibility(ent, true);
+		break;
+	case ID_OUTLINER_SHOW_ONLY_THIS_AND_CHILDREN:
+		ShowOnlyEntityAndChildren(ent);
+		break;
+	case ID_OUTLINER_SHOW_ALL:
+		ShowAllEntities();
+		break;
 	case ID_OUTLINER_REFRESH:
 		Refresh(true);
 		break;
diff --git a/neo/tools/radiant/OutlinerDlg.h b/neo/tools/radiant/OutlinerDlg.h
index 1781380c..87cf964d 100644
--- a/neo/tools/radiant/OutlinerDlg.h
+++ b/neo/tools/radiant/OutlinerDlg.h
@@ -43,7 +43,12 @@ public:
 		ID_OUTLINER_OPEN_PROPERTIES = 0x7310,
 		ID_OUTLINER_MOVE_TO_ENTITY = 0x7311,
 		ID_OUTLINER_REFRESH = 0x7312,
-		OUTLINER_REFRESH_TIMER = 0x7320
+		ID_OUTLINER_TOGGLE_VISIBILITY = 0x7313,
+		ID_OUTLINER_TOGGLE_VISIBILITY_CHILDREN = 0x7314,
+		ID_OUTLINER_SHOW_ONLY_THIS_AND_CHILDREN = 0x7315,
+		ID_OUTLINER_SHOW_ALL = 0x7316,
+		OUTLINER_REFRESH_TIMER = 0x7320,
+		WM_OUTLINER_APPLY_CHECK = WM_APP + 0x321
 	};
 
 	COutlinerDlg();
@@ -71,6 +76,8 @@ protected:
 	afx_msg void OnFilterChanged();
 	void OnTreeDblClick(NMHDR* pNMHDR, LRESULT* pResult);
 	void OnTreeRightClick(NMHDR* pNMHDR, LRESULT* pResult);
+	void OnTreeClick(NMHDR* pNMHDR, LRESULT* pResult);
+	afx_msg LRESULT OnApplyTreeCheck(WPARAM wParam, LPARAM lParam);
 
 	virtual BOOL PreTranslateMessage(MSG* pMsg);
 
@@ -128,7 +135,21 @@ private:
 	HTREEITEM FindTreeItemForEntity(entity_t* ent, HTREEITEM start) const;
 	void ExpandAll(HTREEITEM start);
 
+	void CollectEntityAndChildren(entity_t* ent, CPtrArray& out, CPtrArray& stack) const;
+	void SetEntityVisibility(entity_t* ent, bool visible, bool includeChildren);
+	void ToggleEntityVisibility(entity_t* ent, bool includeChildren);
+	void ShowOnlyEntityAndChildren(entity_t* ent);
+	void ShowAllEntities();
+	void UpdateAllCheckmarks(HTREEITEM start);
+	void ApplyVisibilityChange();
+
 	bool NeedsRefresh() const;
 	bool GetEntityCenter(entity_t* ent, idVec3& center) const;
 	void ApplyFont();
 };
+
+bool Outliner_IsEntityVisible(entity_t* ent);
+void Outliner_SetEntityVisible(entity_t* ent, bool visible);
+void Outliner_ResetEntityVisibility();
+bool Outliner_HasHiddenEntities();
+bool Outliner_IsEntityLinkVisible(entity_t* source, entity_t* target);