[Bf-blender-cvs] [c040dedc124] master: Fix incorrect MIS with principled BSDF and specular roughness 0.

[Brecht Van Lommel]

Commit: c040dedc124a413c13c62677f7d6aee0fd15668f
Author: Brecht Van Lommel
Date:   Sat Oct 7 21:43:36 2017 +0200
Branches: master
https://developer.blender.org/rBc040dedc124a413c13c62677f7d6aee0fd15668f

Fix incorrect MIS with principled BSDF and specular roughness 0.

===================================================================

M	intern/cycles/kernel/closure/bsdf_microfacet.h

===================================================================

diff --git a/intern/cycles/kernel/closure/bsdf_microfacet.h b/intern/cycles/kernel/closure/bsdf_microfacet.h
index b12e248f0a3..a780bd0cf28 100644
--- a/intern/cycles/kernel/closure/bsdf_microfacet.h
+++ b/intern/cycles/kernel/closure/bsdf_microfacet.h
@@ -605,8 +605,7 @@ ccl_device int bsdf_microfacet_ggx_sample(KernelGlobals *kg, const ShaderClosure
 
 						/* if fresnel is used, calculate the color with reflection_color(...) */
 						if(use_fresnel) {
-							*pdf = 1.0f;
-							*eval = reflection_color(bsdf, *omega_in, m);
+							*eval *= reflection_color(bsdf, *omega_in, m);
 						}
 
 						label = LABEL_REFLECT | LABEL_SINGULAR;