X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=shaderlib%2Fcooktorrance.glsl;h=ff1a56c7c237e240ebd7cb4c69df8a7ce24a36ba;hb=190a7e11237351f6b730c28f7b16f183e8adc69c;hp=d8e07b292e4e2ecdaa434875ef21f0f7cd1eec72;hpb=ab23d3910ac081066b42c184c6229aaa397dd46c;p=libs%2Fgl.git

diff --git a/shaderlib/cooktorrance.glsl b/shaderlib/cooktorrance.glsl
index d8e07b29..ff1a56c7 100644
--- a/shaderlib/cooktorrance.glsl
+++ b/shaderlib/cooktorrance.glsl
@@ -74,7 +74,8 @@ virtual vec3 get_emission_color()
 /* Computes the diffuse reflection of the macrosurface */
 vec3 lambert_diffuse(vec3 base_color)
 {
-	// Scale by pi to get a result per steradian, suitable for integration
+	/* Scale by pi (cosine-weighted area of a hemisphere) because the light
+	scatters in every direction */
 	return base_color/PI;
 }