Shadow Terminator Geometry Offset causes artifacts for translucent shader (Cycles) #93418
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Reference: blender/blender#93418
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System Information
Operating system: Windows-10-10.0.19043-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3060 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 496.13
Blender Version
Broken: version: 3.1.0 Alpha, branch: master, commit date: 2021-11-22 23:57, hash:
d1a4e043bdWorked: (newest version of Blender that worked as expected)
Short description of error
If object has smooth shading and Geometry Offset enabled, then shadows visible through the surface, due to translucent shader, appear broken up. The intensity of this effect depends on how irregular the shape is. In these examples there is a sphere casting a shadow on the other side of the object.
How it should look:
Exact steps for others to reproduce the error
geo_offset_bug.blend
Added subscriber: @slowburn
Added subscribers: @ktdfly, @Alaska
Changed status from 'Needs Triage' to: 'Confirmed'
I can confirm the issue however I'm not entirely sure if this is a bug or an artifact that's expected of the geometry offset. @ktdfly are you able to comment on this?
In general, this kind of artifacts is expected (saddle points on geometry, smooth normals are parallel and have a big enough angle from geometry normals), although I know how it can be improved for this specific case (looking from behind by using the translucent bsdf), so I'd call it a bug.
This issue was referenced by blender/cycles@994fe98ab5
This issue was referenced by
4c8740a452This issue was referenced by
a92805bf24Changed status from 'Confirmed' to: 'Resolved'