Commit: f812b05922f51c4c6c5d1c8898fb2cd6aba3f3f0
Author: Sergey Sharybin
Date:   Thu Dec 1 14:27:10 2016 +0100
Branches: master
https://developer.blender.org/rBf812b05922f51c4c6c5d1c8898fb2cd6aba3f3f0

Fix T50116: Light threshold broke branched path tracer

In fact, the issue was caused by light threshold being too high for
certain scenes. Lowered it down to 0.01.

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

M       intern/cycles/blender/addon/properties.py

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

diff --git a/intern/cycles/blender/addon/properties.py 
b/intern/cycles/blender/addon/properties.py
index 607aafb..3616b13 100644
--- a/intern/cycles/blender/addon/properties.py
+++ b/intern/cycles/blender/addon/properties.py
@@ -288,7 +288,7 @@ class CyclesRenderSettings(bpy.types.PropertyGroup):
                 description="Probabilistically terminate light samples when 
the light contribution is below this threshold (more noise but faster 
rendering). "
                             "Zero disables the test and never ignores lights",
                 min=0.0, max=1.0,
-                default=0.05,
+                default=0.01,
                 )
 
         cls.caustics_reflective = BoolProperty(

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