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Wrong shading with "Random Walk" in combination with branched path tracing
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Description

System Information
Win10 x64, nVidia GTX 1080Ti

Blender Version
Broken: Latest master (all versions with the brand-new "Random Walk" SSS
Worked: none

Short description of error
I noticed that objects using the new Random Walk SSS are rendered black when behind a refractive object e.g. a Principled shader with Transmission set to 1 or a simple "Refraction BSDF. Transparent BSDF doesn't show this problem.

Exact steps for others to reproduce the error

  • Open the attached scene file in the latest master / buildbot build

  • Hit F12 to render:

  • Now set the sampling to simple "Path Tracing" and render again: