Objects in volumes have dirty noisy object pass AOV #100474
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Reference: blender/blender#100474
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System Information
Operating system: Windows 11
Graphics card: RTX 2070
Blender Version
Broken: : 3.4, 2.93
Short description of error
See the image for the dirt Object index AOV
Exact steps for others to reproduce the error
Check the Comp tab for the result
_17082022_2227_24.zip
Added subscriber: @kursadk
Added subscriber: @PratikPB2123
Changed status from 'Needs Triage' to: 'Needs Developer To Reproduce'
Added subscriber: @Jeroen-Bakker
Thanks for the report. I'm able to redo this. Adding denoise node solves the issue.
I'm not sure whether this is expected so forwarding this report to developers
Denoising an AOV like that is not a good idea. This pass should be clean or properly calculated. As you can see, the dirty noise pattern has no correlation to the scene structure or the existing volume. This is clearly a badly calculated AOV.
Added subscriber: @Sergey
The proper way of supporting such setup is something close to DeepEXR. Having a single pass with object or material index is going to be limited in one setups or another. The closest we have to it is the Cryptomatte passes.
The technical reason why it is happening is because the index passes are only written to the render result for the first sample. This is because you don't want to apply filter on pixels which store index. When there is volume on the way from camera to the object the ray might scatter, leading to the non-clean results as in the attached example.