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Maniphest T78981

Broken mesh/file: AO fails on certain mesh if it is elevated above floor.
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Description

System Information
Operating system: Windows-7-6.1.7601-SP1 64 Bits
Graphics card: GeForce GTX 660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 445.87

Blender Version
Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-07-16 00:24, hash: rB75a09ba2ed26
Worked: (newest version of Blender that worked as expected)

Short description of error
I can`t find any reason in geometry like doubles, broken normals or something like this.
Same bug in release. Not reproducable with promotives. But if I add primitive to this mesh, glitch appears.

AOFail.blend1 MBDownload

Related Objects

Event Timeline

Vyacheslav (hitrpr) created this task.Jul 16 2020, 12:15 PM
Germano Cavalcante (mano-wii) added subscribers: Brecht Van Lommel (brecht), Germano Cavalcante (mano-wii).Jul 16 2020, 5:17 PM

It looks the same as T75469 and related tasks
I'll leave this for @Brecht Van Lommel (brecht)

Brecht Van Lommel (brecht) closed this task as a duplicate of T75469: AO shader artifacts.Jul 16 2020, 5:18 PM

It's indeed the same type of issue, we have T78007: Cycles: ray offset for more accurate intersections to investigate solutions to this.