Page MenuHome

Dark Intersections when using Cycles Random Walk SSS
Closed, DuplicatePublic


System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce RTX 2070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.09

Blender Version
Broken: version: 2.91.2, branch: master, commit date: 2021-01-19 16:15, hash: rB5be9ef417703
Worked: Not working in 2.83, 2.91, 2.92, or 2.93.

Short description of error
This may be expected/known behavior, but I'm seeing some really odd dark "seams" when portions of a mesh with Random Walk SSS intersect themselves (in this case, a character's knee) - rendered in Cycles.

The "spread" is directly related to Subsurface setting in the Principled BSDF shader.

When using Burley SSS these artifacts do not appear. Tried with CUDA, OPTIX, CPU, etc

Exact steps for others to reproduce the error
Open the attached Blend, go to rendered view. Both models have identical materials with the exception of the SSS calculation mode.

Event Timeline

I think this is the same as T81602 Its a limitation in the algorithm

Yeah - that looks like the same thing. So, this can probably be closed.