From fea1ed54804c461b8ee5d5469b06d2349918adbd Mon Sep 17 00:00:00 2001
From: copperpixel <48454166+copperpixel@users.noreply.github.com>
Date: Tue, 2 Dec 2025 18:42:07 +0100
Subject: [PATCH 1/2] fix a case of dynamic shadows pokethrough thin surfaces

---
 src/game/client/clientshadowmgr.cpp | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/src/game/client/clientshadowmgr.cpp b/src/game/client/clientshadowmgr.cpp
index 8daa9f65890..257fb822f11 100644
--- a/src/game/client/clientshadowmgr.cpp
+++ b/src/game/client/clientshadowmgr.cpp
@@ -2192,6 +2192,31 @@ void CClientShadowMgr::ComputeExtraClipPlanes( IClientRenderable* pRenderable,
 		}
 	}
 
+	class CTraceFilterShadowReceiversOnly : public CTraceFilter
+	{
+		virtual bool ShouldHitEntity( IHandleEntity *pHandleEntity, int fContentsMask )
+		{
+			if ( !StandardFilterRules( pHandleEntity, fContentsMask ) )
+				return false;
+
+			C_BaseEntity *pEntity = EntityFromEntityHandle( pHandleEntity );
+			if ( pEntity && !pEntity->ShouldReceiveProjectedTextures( SHADOW_FLAGS_PROJECTED_TEXTURE_TYPE_MASK ) )
+				return false;
+
+			return true;
+		}
+	};
+
+	// Do a trace to the bbox corner origin. If it hits a shadow receiving brush
+	// move the corner to be outside it so shadows won't poke-thru thin walls
+	CTraceFilterShadowReceiversOnly traceFilter;
+	trace_t tr;
+	UTIL_TraceLine( pRenderable->GetRenderOrigin(), origin, MASK_SOLID_BRUSHONLY, &traceFilter, &tr );
+	if ( tr.fraction < 1.f )
+	{
+		VectorAdd( tr.endpos, tr.plane.normal, origin );
+	}
+
 	// Now that we have it, create 3 planes...
 	Vector normal;
 	ClearExtraClipPlanes(handle);

From ba6050619ddbc082e08b36b7e08be430c1cfaa0a Mon Sep 17 00:00:00 2001
From: copperpixel <48454166+copperpixel@users.noreply.github.com>
Date: Tue, 2 Dec 2025 23:38:20 +0100
Subject: [PATCH 2/2] fix wrong shadow mask

---
 src/game/client/clientshadowmgr.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/game/client/clientshadowmgr.cpp b/src/game/client/clientshadowmgr.cpp
index 257fb822f11..c391e16455c 100644
--- a/src/game/client/clientshadowmgr.cpp
+++ b/src/game/client/clientshadowmgr.cpp
@@ -2200,7 +2200,7 @@ void CClientShadowMgr::ComputeExtraClipPlanes( IClientRenderable* pRenderable,
 				return false;
 
 			C_BaseEntity *pEntity = EntityFromEntityHandle( pHandleEntity );
-			if ( pEntity && !pEntity->ShouldReceiveProjectedTextures( SHADOW_FLAGS_PROJECTED_TEXTURE_TYPE_MASK ) )
+			if ( pEntity && !pEntity->ShouldReceiveProjectedTextures( SHADOW_FLAGS_SHADOW ) )
 				return false;
 
 			return true;