Harsh lines in Denoising Albedo with subsurface scattering materials #94758

New Issue

Alaska · 2022-01-09T02:35:35+01:00

Alaska commented

2022-01-09 02:35:35 +01:00

System Information
Operating system: Linux-5.15.0-2-amd64-x86_64-with-glibc2.33 64 Bits
Graphics card: NA

Blender Version
Broken version: 3.0 release
Broken version: 3.1.0 Alpha, branch: master, commit date: 2022-01-05 22:15, hash: 1d9bac7d92
Worked: 2.93 (Presumably all versions of Blender prior to the Cycles-X merge)

Short description of error
When rendering a material with a texture dictating the presence of subsurface scattering on a material, there are harsh lines visible in the denoising albedo pass not seen in previous Blender versions. These harsh lines tend to be visible after denoising:

Denoising Albedo pass of 2.93	Denoising Albedo pass of 3.0 and 3.1

Exact steps for others to reproduce the error

Change the render engine to Cycles and enable the Denoising Data pass for rendering.
Create an object with a new material (Principled BSDF). Change the Base Color and Subsurface Color to different colors (E.G. One red and one blue)
Add a texture where some parts are black and other areas are gradients between black and white.
Connect the texture to the Subsurface input of the Principled BSDF
Render the scene and look at the Denosing Albedo pass, comparing the pass between Blender 3.0 and above to older versions of Blender (2.93). Notice the harsh lines, they sometimes remain remain visible in the final image after denoising.

Here is a file with steps 1-4 done:
Denoising Albedo SSS artifacts.blend

The face of the character from the Junkshop scene from the link below also demonstrates this issue:
https://www.blender.org/download/demo-files/

**System Information** Operating system: Linux-5.15.0-2-amd64-x86_64-with-glibc2.33 64 Bits Graphics card: NA **Blender Version** Broken version: 3.0 release Broken version: 3.1.0 Alpha, branch: master, commit date: 2022-01-05 22:15, hash: `1d9bac7d92` Worked: 2.93 (Presumably all versions of Blender prior to the Cycles-X merge) **Short description of error** When rendering a material with a texture dictating the presence of subsurface scattering on a material, there are harsh lines visible in the denoising albedo pass not seen in previous Blender versions. These harsh lines tend to be visible after denoising: |Denoising Albedo pass of 2.93|Denoising Albedo pass of 3.0 and 3.1| | -- | -- | |![SSS Artifacts 2.93.png](https://archive.blender.org/developer/F12796809/SSS_Artifacts_2.93.png)|![SSS Artifacts 3.0.png](https://archive.blender.org/developer/F12796811/SSS_Artifacts_3.0.png)| **Exact steps for others to reproduce the error** 1. Change the render engine to Cycles and enable the `Denoising Data` pass for rendering. 2. Create an object with a new material (`Principled BSDF`). Change the `Base Color` and `Subsurface Color` to different colors (E.G. One red and one blue) 3. Add a texture where some parts are black and other areas are gradients between black and white. 4. Connect the texture to the `Subsurface` input of the `Principled BSDF` 5. Render the scene and look at the `Denosing Albedo` pass, comparing the pass between Blender 3.0 and above to older versions of Blender (2.93). Notice the harsh lines, they sometimes remain remain visible in the final image after denoising. Here is a file with steps 1-4 done: [Denoising Albedo SSS artifacts.blend](https://archive.blender.org/developer/F12796820/Denoising_Albedo_SSS_artifacts.blend) The face of the character from the Junkshop scene from the link below also demonstrates this issue: https://www.blender.org/download/demo-files/

Alaska commented

2022-01-09 02:35:35 +01:00

Added subscriber: @Alaska

Pratik Borhade commented

2022-01-09 12:09:12 +01:00

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

Pratik Borhade commented

2022-01-09 12:09:17 +01:00

Added subscriber: @PratikPB2123

Alaska commented

2022-01-10 10:19:46 +01:00

Added subscriber: @brecht

Alaska commented

2022-01-10 10:19:46 +01:00

I thought this issue might of came from the Cycles-X merge, however upon further investigation it wasn't. Instead this issue came from commit: a94343a8af

CC @brecht

I thought this issue might of came from the Cycles-X merge, however upon further investigation it wasn't. Instead this issue came from commit: a94343a8af CC @brecht

Raimund Klink commented

2022-01-10 12:46:41 +01:00

Added subscriber: @Raimund58

blender-admin commented

2022-01-13 00:09:22 +01:00

This issue was referenced by blender/cycles@c592062925

This issue was referenced by blender/cycles@c592062925ddb26f6a859ec0214cd1425cb7ed6a

blender-admin commented

2022-01-13 00:09:22 +01:00

This issue was referenced by eaa4cdaa42

This issue was referenced by eaa4cdaa4230d69b470d229017bad27c03c9ef14

Brecht Van Lommel commented

2022-01-13 10:51:25 +01:00

Changed status from 'Confirmed' to: 'Resolved'

Brecht Van Lommel closed this issue

2022-01-13 10:51:25 +01:00

Brecht Van Lommel self-assigned this 2022-01-13 10:51:25 +01:00

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Harsh lines in Denoising Albedo with subsurface scattering materials #94758

Harsh lines in `Denoising Albedo` with subsurface scattering materials #94758