From 7b6f7fdf7194eb66fe973b473ab385e035984070 Mon Sep 17 00:00:00 2001
From: havoc <havoc@d7cf8633-e32d-0410-b094-e92efae38249>
Date: Fri, 27 Nov 2009 15:31:58 +0000
Subject: [PATCH] more work on mod_generatelightmaps: don't accept lights
 behind a surface, they mess up shading

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@9524 d7cf8633-e32d-0410-b094-e92efae38249
---
 model_shared.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/model_shared.c b/model_shared.c
index 1635e087..faec4c5a 100644
--- a/model_shared.c
+++ b/model_shared.c
@@ -3219,6 +3219,9 @@ static void Mod_GenerateLightmaps_SamplePoint(const float *pos, const float *nor
 	{
 		//R_SampleRTLights(pos, sample, numoffsets, offsets);
 		VectorSubtract(lightinfo->origin, pos, relativepoint);
+		// don't accept light from behind a surface, it causes bad shading
+		if (normal && DotProduct(relativepoint, normal) <= 0)
+			continue;
 		dist2 = VectorLength2(relativepoint);
 		if (dist2 >= lightinfo->radius2)
 			continue;
-- 
2.39.2