From f315366f43c7e8e97142c1d3d1bee963e3f9577e Mon Sep 17 00:00:00 2001
From: Eric Wasylishen <ewasylishen@gmail.com>
Date: Mon, 4 Apr 2016 23:58:12 -0600
Subject: [PATCH] light: hack to fix lights exactly on faces

---
 light/ltface.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/light/ltface.c b/light/ltface.c
index 34e914a9..6b09ae9c 100644
--- a/light/ltface.c
+++ b/light/ltface.c
@@ -1158,6 +1158,9 @@ LightFace_Entity(const entity_t *entity, const lightsample_t *light,
                 spotscale = 1.0 - spotscale;
             }
         }
+        
+        /* HACK: support lights lying exactly on a face by only tracing up to 0.1 units from the light */
+        dist = qmax(0.0f, dist - 0.1f);
 
         if (!TestLight_embree(surfpoint, ray, dist, modelinfo))
             continue;