Poor denoising results with volumes and branched path tracing (with multiple volume samples and bounces). #61290

Closed
opened 2019-02-07 18:14:09 +01:00 by Adam Friesen · 5 comments

System Information
Operating system: Win10 64 bit, April Update
Graphics card: GeForce GTX 1060 6GB.

Blender Version
Broken: Blender 2.8 hash a5869c367e
Worked: None

Short description of error
In scenes using Branched Path Tracing, areas containing volumetric shading can cause the denoiser to produce very poor results. This occurs with settings allowing 1 or more volume bounces and gets markedly worse if you raise the number of volume samples per AA sample. You can see the reason in the denoising passes, the normal pass flattens while getting artifacts and the albedo pass brightens and gets washed out.

Exact steps for others to reproduce the error
Open the .blend and render. Look at the denoising passes to note the marked decrease in quality where the cube is.

.blendPassbug.blend

**System Information** Operating system: Win10 64 bit, April Update Graphics card: GeForce GTX 1060 6GB. **Blender Version** Broken: Blender 2.8 hash a5869c367e66 Worked: None **Short description of error** In scenes using Branched Path Tracing, areas containing volumetric shading can cause the denoiser to produce very poor results. This occurs with settings allowing 1 or more volume bounces and gets markedly worse if you raise the number of volume samples per AA sample. You can see the reason in the denoising passes, the normal pass flattens while getting artifacts and the albedo pass brightens and gets washed out. **Exact steps for others to reproduce the error** Open the .blend and render. Look at the denoising passes to note the marked decrease in quality where the cube is. **.blend**[Passbug.blend](https://archive.blender.org/developer/F6540633/Passbug.blend)
Author

Added subscriber: @Ace_Dragon

Added subscriber: @Ace_Dragon
Lukas Stockner was assigned by Sebastian Parborg 2019-02-07 19:35:44 +01:00
Lukas Stockner was unassigned by Dalai Felinto 2019-12-23 16:35:14 +01:00

Added subscriber: @LukasStockner

Added subscriber: @LukasStockner

Added subscriber: @ThomasDinges

Added subscriber: @ThomasDinges

Changed status from 'Confirmed' to: 'Archived'

Changed status from 'Confirmed' to: 'Archived'

Branched Path Tracing has been removed with Blender 3.0. Also new Denoisers (OIDN and Optix) ara available now. If the issue persists for you in Blender 3.x please file a new report.

Branched Path Tracing has been removed with Blender 3.0. Also new Denoisers (OIDN and Optix) ara available now. If the issue persists for you in Blender 3.x please file a new report.
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Reference: blender/blender#61290
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