Commit: 178c470c43870adae4bfdcb6d03e1657a6f98f43
Author: Clément Foucault
Date: Fri Jun 30 14:10:42 2017 +0200
Branches: blender2.8
https://developer.blender.org/rB178c470c43870adae4bfdcb6d03e1657a6f98f43
Eevee: Fix specular shadowing.
Compute luminance approximation instead of using green channel.
This is to match cycles principled bsdf.
===================================================================
M source/blender/draw/engines/eevee/shaders/bsdf_common_lib.glsl
===================================================================
diff --git a/source/blender/draw/engines/eevee/shaders/bsdf_common_lib.glsl
b/source/blender/draw/engines/eevee/shaders/bsdf_common_lib.glsl
index 0ccf2309bb4..0351fa4a861 100644
--- a/source/blender/draw/engines/eevee/shaders/bsdf_common_lib.glsl
+++ b/source/blender/draw/engines/eevee/shaders/bsdf_common_lib.glsl
@@ -266,16 +266,16 @@ vec3 F_area(vec3 f0, vec2 lut)
vec2 fac = normalize(lut.xy);
/* Unreal specular matching : if specular color is below 2% intensity,
- * (using green channel for intensity) treat as shadowning */
- return saturate(50.0 * f0.g) * fac.y + fac.x * f0;
+ * treat as shadowning */
+ return saturate(50.0 * dot(f0, vec3(0.3, 0.6, 0.1))) * fac.y + fac.x *
f0;
}
/* Fresnel approximation for LTC area lights (not MRP) */
vec3 F_ibl(vec3 f0, vec2 lut)
{
/* Unreal specular matching : if specular color is below 2% intensity,
- * (using green channel for intensity) treat as shadowning */
- return saturate(50.0 * f0.g) * lut.y + lut.x * f0;
+ * treat as shadowning */
+ return saturate(50.0 * dot(f0, vec3(0.3, 0.6, 0.1))) * lut.y + lut.x *
f0;
}
/* GGX */
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