Displacement map, wrong normals and shadows on triangle geometry #86386
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Reference: blender/blender#86386
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System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: Quadro RTX 3000/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 452.69
Blender Version
Broken: version: 2.92.0, branch: master, commit date: 2021-02-24 16:25, hash:
02948a2cabWorked: ?
Short description of error
Experimental Cycles displacement introduces rendering artifacts on some geometries made of triangles. The problem seem to disappear on quad geometry.
Exact steps for others to reproduce the error
Open the attached "displace-problem.blend" file.
Render an image, or enable Cycles preview in viewport.
The left object is made of triangles, and appears with problems.
The right object is made of 1 quad, and appears fine.
displace-problem.blend
Added subscriber: @rotoglup
Some images to show the problem :
Added subscriber: @mano-wii
I believe this is a limitation of the adaptive subdivide.
The object's topology is compromised in this situation.
Added subscriber: @lichtwerk
Changed status from 'Needs Triage' to: 'Confirmed'
Will confirm this now, looks like generated normals are flipped somehow.
Dont see this being mentioned in #53901 (Cycles adaptive subdivision tasks) yet, so needs some input from the Rendering module.
The 'True normals' indeed seem off, I've been outputing those using AOV and a more regular displacement texture to make normals easier to 'read'.
The blend file : displace-problem-V2.blend