X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=shaderlib%2Fcooktorrance.glsl;h=02d697b087c640572a2ed0ebad15fe655ff4f1d2;hb=f87993e0748f711b0b2439fe6ab4945bddad25c0;hp=d834cee462d429ca2d439107caca5ad3e1c55c8d;hpb=70d9d2d28e5fe723c6b46894276e4c935f578e2d;p=libs%2Fgl.git

diff --git a/shaderlib/cooktorrance.glsl b/shaderlib/cooktorrance.glsl
index d834cee4..02d697b0 100644
--- a/shaderlib/cooktorrance.glsl
+++ b/shaderlib/cooktorrance.glsl
@@ -114,7 +114,7 @@ vec3 fresnel_schlick(vec3 halfway, vec3 look, vec3 base_color, float metalness)
 {
 	// 0.04 is a decent approximation for dielectric base reflectivity
 	vec3 f0 = mix(vec3(0.04), base_color, metalness);
-	return mix(f0, vec3(1.0), pow(1.0-dot(halfway, look), 5.0));
+	return mix(f0, vec3(1.0), pow(max(1.0-dot(halfway, look), 0.0), 5.0));
 }
 
 /* Computes the full contribution of a single light */