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Cycles PMJ adaptive sampling working poorly with many bounces
Confirmed, NormalPublicBUG

Description

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 950M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 398.35

Blender Version
Broken: version: 2.90.0 Beta, branch: master, commit date: 2020-07-22 14:02, hash: rB0e280b96ca82

Short description of error
Adaptive sampling does not take into account the minimum number of samples, as well as the threshold, additionally leaving square artifacts
Without adaptive sampling


With adaptive sampling

Exact steps for others to reproduce the error

  • Open attached file
  • press F12 to render

Event Timeline

CHET (cheteron) updated the task description. (Show Details)
Germano Cavalcante (mano-wii) renamed this task from Render bug to Render artefacts with adaptive sampling+Intel denoise.Jul 23 2020, 8:47 PM
Germano Cavalcante (mano-wii) changed the task status from Needs Triage to Confirmed.
Germano Cavalcante (mano-wii) updated the task description. (Show Details)
Germano Cavalcante (mano-wii) changed the subtype of this task from "Report" to "Bug".

Can't reproduce with RTX 2080ti.
Please try to update the Nvidia drivers of the GPU to the latest (your drivers seem outdated) and try again.

It's not a driver problem, because in blender version: 2.90.0 Beta, branch: master, commit date: 2020-07-27 20:19, hash: 221604cdd663 - noise threshold works correctly

Can't reproduce with RTX 2080ti.
Please try to update the Nvidia drivers of the GPU to the latest (your drivers seem outdated) and try again.

The problem here is that adaptive sampling enables the PMJ sampling pattern, which seems to be doing poorly on this scene compared to Sobol and CMJ.

@Stefan Werner (swerner), maybe you have a guess for why PMJ would fail here.

Brecht Van Lommel (brecht) renamed this task from Render artefacts with adaptive sampling+Intel denoise to Cycles PMJ adaptive sampling working poorly with many bounces.Nov 9 2020, 3:35 PM