Cycles: using Adaptive Sampling with Progressive Refine causes severe artefacting #85892
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Reference: blender/blender#85892
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System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: Radeon (TM) RX 470 Graphics ATI Technologies Inc. 4.5.14758 Core Profile Context 21.2.2 27.20.14535.1000
Blender Version
Broken: version: 2.92.0 Release Candidate, branch: master, commit date: 2021-02-19 18:02, hash:
b1142858d4Worked: 2.91
Short description of error
When rendering with Adaptive Sampling and Progressive Refine both enabled, white artefacts appear in parts of the image. Note that they only appear after a certain number of samples, when adaptivity kicks in, I presume. Also I only tested CPU rendering.
Top is rendered in 2.91, bottom in 2.92 rc, on same exacts settings.
Exact steps for others to reproduce the error
cycles_artifacts.blend
Added subscriber: @slowburn
#86145 was marked as duplicate of this issue
Added subscriber: @mano-wii
Changed status from 'Needs Triage' to: 'Needs User Info'
I can't replicate the problem?
Can you provide a file showing it?
Many bugs are fixed between the official releases. Please try the latest development snapshot of blender: https://builder.blender.org/download
Changed status from 'Needs User Info' to: 'Confirmed'
I managed to reproduce the problem!
It starts to appear after 32 frames.
Here the file that I used to test:
cycles_artifacts.blend
It seems that this bug is somehow caused by adaptive sampling and the exact number of samples when these artefacts start appearing is dependent on the total number of render samples, but they do appear eventually.
Added subscriber: @Ornibulon
Added subscriber: @DIMITRIS
Added subscriber: @meermanr
In case it helps, here's a video of it happening on OSX with the default cube's scene:
CleanShot 2021-03-04 at 19.49.45 of Blender's Blender.mp4
Versions from "About Blender" dialog:
"""
Blender version: 2.92.0
Date: 2021-02-24 16:25
Hash:
02948a2cabBranch: master
"""
Added subscriber: @harrylr
Those actions (specifically disabling "Adaptive Sampling") cured the destroyed cycles renders in 2.9.2 (Mac OS Mojave).
Thank you.
Harry
Added subscriber: @PeterBoos
Having the problem as well, i did a CPU progresive render with adaptive sampling, and openimage denoiser, some areas have it more than other areas, towards the end of rendering more and more spots get visible.
In the picture below, the window does not contain glass its an opening, the picture is from streetview and a picture emitting light. sharing the blend as well (tip nice wood shader i made there)
i wonder if it could be caused by https://developer.blender.org/D11088 ?
KEUKEN.blend
This issue was referenced by
912f2b1a29Added subscriber: @brecht
This will be solved in Cycles X, for 2.93 we'll just disable the combination since it's rather complex to solve.
Changed status from 'Confirmed' to: 'Resolved'