(Denoising) Artifacts on Adaptive Sampling #82383

New Issue

Chloe Isabelle Bläker · 2020-11-03T22:46:37+01:00

2020-11-03 22:46:37 +01:00

System Information
Windows 10 (10.0.19042) 64-bit

Blender Version
2.90.1 Public

Short description or error
Using denoising (Intel Open-Denoise and OptiX Denoise) with adaptive sampling can produce weird artifacts around high noise/high contrast sites.

The noise pattern using adaptive sampling is clearly altered and creates splotchy spots of dark so this seems to be a problem on the adaptive sampling side not the denoising specifically.
Non denoised adaptive sampling output:

Exact steps for others to reproduce the error
Open the project attached to this task.
Toggle adaptive sampling on and off, start the render, wait for the denoiser to show the results
Optionally mute denoiser node in compositor to observe changed noise pattern.
volume.blend

**System Information** Windows 10 (10.0.19042) 64-bit **Blender Version** 2.90.1 Public **Short description or error** Using denoising (Intel Open-Denoise and OptiX Denoise) with adaptive sampling can produce weird artifacts around high noise/high contrast sites. ![adaptive_denoised.png](https://archive.blender.org/developer/F9185953/adaptive_denoised.png) ![no_adaptive_denoised.png](https://archive.blender.org/developer/F9185958/no_adaptive_denoised.png) The noise pattern using adaptive sampling is clearly altered and creates splotchy spots of dark so this seems to be a problem on the adaptive sampling side not the denoising specifically. Non denoised adaptive sampling output: ![adaptive_noisy.png](https://archive.blender.org/developer/F9185996/adaptive_noisy.png) **Exact steps for others to reproduce the error** Open the project attached to this task. Toggle adaptive sampling on and off, start the render, wait for the denoiser to show the results Optionally mute denoiser node in compositor to observe changed noise pattern. [volume.blend](https://archive.blender.org/developer/F9185974/volume.blend)

Chloe Isabelle Bläker commented

2020-11-03 22:46:37 +01:00

Added subscriber: @chloe055

Philipp Oeser commented

2020-11-04 18:46:43 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2020-11-04 18:46:43 +01:00

Duplicate of {#79190}?

Philipp Oeser commented

2020-11-04 18:49:42 +01:00

#75618 (Cycles adaptive sampling gives noisy denoising shadow pass) might also be a duplicate

Chloe Isabelle Bläker commented

2020-11-04 18:51:18 +01:00

In #82383#1048194, @lichtwerk wrote:
Duplicate of {#79190}?

I didn't see that, could be although I didn't get any of the square tile artifacts, if you think it's the same cause then this is closed already

> In #82383#1048194, @lichtwerk wrote: > Duplicate of {#79190}? I didn't see that, could be although I didn't get any of the square tile artifacts, if you think it's the same cause then this is closed already

Brecht Van Lommel commented

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

Added subscriber: @brecht

Brecht Van Lommel commented

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

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

Brecht Van Lommel closed this issue

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

Brecht Van Lommel commented

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

When adaptive sampling is unable to detect the noise early enough, that's leads to structured artifacts. The solution then is to increase the minimum number of samples.

While we will work on improving adaptive sampling to reduce the cases where this happens, this interaction between denoising and adaptive sampling is not a bug, but an indication we can improve our adaptive sampling algorithms further.

When adaptive sampling is unable to detect the noise early enough, that's leads to structured artifacts. The solution then is to increase the minimum number of samples. While we will work on improving adaptive sampling to reduce the cases where this happens, this interaction between denoising and adaptive sampling is not a bug, but an indication we can improve our adaptive sampling algorithms further.

Brecht Van Lommel commented

2021-11-05 22:21:17 +01:00

Adaptive sampling improvements are tracked in #74581 (Cycles: adaptive sampling improvements).

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(Denoising) Artifacts on Adaptive Sampling #82383