Cycles adaptive sampling gives noisy denoising shadow pass #75618

New Issue

Jac PETIT-JEAN-BORET · 2020-04-11T14:56:02+02:00

2020-04-11 14:56:02 +02:00

System Information
Operating system: Windows-7-6.1.7601-SP1 64 Bits
Graphics card: GeForce GTX 970/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 426.00

Blender Version
Broken: version: 2.83 (sub 13), branch: master, commit date: 2020-04-08 21:23, hash: 1239cab11f
Worked: 2.82a

Short description of error
Dots in denoised render.

Exact steps for others to reproduce the error
Try to render the file in 2.82a (no dots) and in 2.83 (dots) as seen on this pic (I made it lighter in pshop to emphasize the difference).. It seems it comes from the lighting because if I suppress any light source, the problem disappears.
I am aware that it's not a "big" bug and it is very peculiar to these lights, but nevertheless I keep you informed.
denoise2.blend

**System Information** Operating system: Windows-7-6.1.7601-SP1 64 Bits Graphics card: GeForce GTX 970/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 426.00 **Blender Version** Broken: version: 2.83 (sub 13), branch: master, commit date: 2020-04-08 21:23, hash: `1239cab11f` Worked: 2.82a **Short description of error** Dots in denoised render. **Exact steps for others to reproduce the error** Try to render the file in 2.82a (no dots) and in 2.83 (dots) as seen on this pic (I made it lighter in pshop to emphasize the difference)..![denoise-change.png](https://archive.blender.org/developer/F8464641/denoise-change.png) It seems it comes from the lighting because if I suppress any light source, the problem disappears. I am aware that it's not a "big" bug and it is very peculiar to these lights, but nevertheless I keep you informed. [denoise2.blend](https://archive.blender.org/developer/F8464646/denoise2.blend)

Jac PETIT-JEAN-BORET commented

2020-04-11 14:56:02 +02:00

Added subscriber: @rimpotche

Alaska commented

2020-04-12 01:02:51 +02:00

Added subscriber: @Alaska

Alaska commented

2020-04-12 01:02:51 +02:00

The issue actually branches from adaptive sampling. If you turn this feature off, the issue will go away. You could also try increasing the "minimum samples" setting (20 worked for me) or increase your overall sample count (128 fixed it for me). It should be noted that increasing your overall sample count also increases your minimum sample count ( if it's set to 0/auto) which is why it works.

However, this is still a bug, so I'll leave this thread open for the developers to review.

The issue actually branches from adaptive sampling. If you turn this feature off, the issue will go away. You could also try increasing the "minimum samples" setting (20 worked for me) or increase your overall sample count (128 fixed it for me). It should be noted that increasing your overall sample count also increases your minimum sample count ( if it's set to 0/auto) which is why it works. However, this is still a bug, so I'll leave this thread open for the developers to review.

Richard Antalik commented

2020-04-14 18:11:08 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

Brecht Van Lommel changed title from ~~Normal Denoise 2.83 faulty~~ to Cycles adaptive sampling gives noisy denoising shadow pass

2020-05-14 01:17:33 +02:00

Brecht Van Lommel commented

2020-05-14 01:19:18 +02:00

Added subscribers: @Stefan_Werner, @brecht

Brecht Van Lommel commented

2020-05-14 01:19:18 +02:00

Both adaptive sampling and the denoising shadow pass use even/odd samples, maybe there is some conflict.

Philipp Oeser commented

2020-11-04 18:50:31 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2020-11-04 18:50:31 +01:00

Other reports relating Denoise and AS:
#79190 (Cycles PMJ adaptive sampling working poorly with many bounces)
#82383 ((Denoising) Artifacts on Adaptive Sampling)

Other reports relating Denoise and AS: #79190 (Cycles PMJ adaptive sampling working poorly with many bounces) #82383 ((Denoising) Artifacts on Adaptive Sampling)

Philipp Oeser commented

2020-11-04 18:52:17 +01:00

#81261 (Viewport render better than final render)

Brecht Van Lommel commented

2021-11-05 22:20:27 +01:00

Changed status from 'Confirmed' to: 'Archived'

Brecht Van Lommel closed this issue

2021-11-05 22:20:27 +01:00

Brecht Van Lommel commented

2021-11-05 22:20:27 +01:00

NLM was removed in 3.0, there is no more denoising shadow pass.

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Cycles adaptive sampling gives noisy denoising shadow pass #75618