White outline artifacts with volumetrics in the "Diffuse Indirect" for "Metallic" or "Transmission" of 1.0. #100682
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Reference: blender/blender#100682
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System Information
Operating system: Windows-10-10.0.22000-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 516.94
Blender Version
Broken: version: 3.3.0 Beta, branch: master, commit date: 2022-08-26 18:34, hash:
e040aea7bfWorked: Bug has existed since 3.0.
Short description of error
White outline artifacts appear when volumetrics is enabled in the "Diffuse Indirect". It caused when the object PBR material "Metallic" or Transmission is set 1.0 changing it to 0.999 removes the white outline, but still slightly visible when merging all the light layers in the compositor. No problem in blender 2.93.
It is related to the Halo bug https://developer.blender.org/T94698. It has new test file and steps with new information on this bug to hopefully help developers solved it.
Exact steps for others to reproduce the error
CornellBox_Volumetric.blend
White outline artifacts Blender 3.3 with volumetrics enable for the "Diffuse Indirect" pass with PBR material "Metallic" or "Transmission" value of 1.0:
No white outline artifacts Blender 3.3 with volumetrics disable for the "Diffuse Indirect" pass with PBR material "Metallic" or "Transmission" value of 1.0:
White flat sphere in Blender 3.3 with volumetrics enable for the "Diffuse Indirect" pass with PBR material "Metallic" or "Transmission" value of 0.999:
No white outline artifacts Blender 2.93 with volumetrics enable for the "Diffuse Indirect" pass with PBR material "Metallic" or "Transmission" value of 1.0:
White rounded sphere in Blender 2.93 with volumetrics enable for the "Diffuse Indirect" pass with PBR material "Metallic" or "Transmission" value of 0.999:
Added subscriber: @eklein
Added subscriber: @OmarEmaraDev
Changed status from 'Needs Triage' to: 'Needs User Info'
Is this the same as #94698 but with a new simplified test files and details?
The #94698 did show that having a material "Metallic" or "Transmission" of 1.0 with volumetrics is the main cause of the white outlines in the "Diffuse Indirect" pass, so a new test file, steps and details where necessary to show this issue.
Added subscriber: @brecht
@eklein since you're developing and selling a version of cycles, have you considered looking into this bug and contributing back?
In that case, you should update #94698 instead. Just edit the report with those new details and sample files. I will merge to that report.
Closed as duplicate of #94698
Brecht,
I did try fix this bug and that is why I discover that "Metallic" or 'Transmission" having a value 1.0 was causing the white outlines. The Cycles material and shading system is not an area I am familiar with, so I reported to help narrow down the causes.
Omar,
Do you mean delete all the steps from the #94698 and replace with the new file, images and steps or added to the end?
Well yes, getting familiar with it would be part of the effort. Otherwise that's a reason to never contribute anything back.
@eklein If the new information in this report is more specific, just replace it, if it adds new information, just append it at the end of the report.