Multiscatter GGX Glass and Principled BSDF shows a seam in rendering that shouldn't be there #96604
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Reference: blender/blender#96604
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System Information
Operating system: Windows-10-10.0.19043-SP0 64 Bits
Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 431.07
Blender Version
Broken: version: 3.0.0, branch: master, commit date: 2021-12-02 18:35, hash:
f1cca30557Worked: (newest version of Blender that worked as expected)
Short description of error
When using the Principled BSDF or the Glass BSDF with Multiscatter GGX artifacts that look like seams are visible. These are definitely not refractive phenomena, as it does not occur with other microfacet distribution models.
Below is a comparison of a cylinder with a glass shader in front of a checker pattern. As you can see, Multiscatter GGX has a "seam" in it that doesn't make sense and isn't present with GGX.
Exact steps for others to reproduce the error
Multitest.blend
As can be seen in the test file, seamlike artifacts appear when roughness!=0. When changing the microfacet distribution model to a different one the artifacts are not visible.
Thank you and have a great day!
Added subscriber: @tempdevnova
Added subscriber: @Alaska
Changed status from 'Needs Triage' to: 'Confirmed'
I can confirm this issue.
System Information
Operating system: Linux-5.16.0-3-amd64-x86_64-with-glibc2.33 64 Bits
Graphics card: NVIDIA GeForce RTX 3060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 510.54
Broken version: 3.2.0 Alpha, branch: master, commit date: 2022-03-17 21:23, hash:
6d97a5f93cAdded subscriber: @baoyu
It's basically the same bug I found?
https://developer.blender.org/T85259
It definitely looks like it, so probably yes
Added subscriber: @Fernando-Alcala
Camera moving in
Camera move in0001-0120.mp4
Camera rotating
Camera rotate0001-0120.mp4
Roughness animated from 0 to 1
material 0 to 10001-0120.mp4
It looks cool though
@Fernando-Alcala
You've posted a comment show casing a collection of "artifacts". But without much information, or access to the .blend file, we can not confirm if this is the same issue as the original report or not.
Are you able to open a new report and include information about the issue you're experiencing?
Added subscriber: @brecht
@brecht are you able to look at this and confirm if this is a bug, or a limitation of Multiscatter GGX. If it is a bug, is it related to other reports? (E.G. #82500, #85259, #92520)
The Multiscatter GGX issues trilogy (part 3 of 3 (Glass BSDF/Principled BSDF (transparency=1) ))to Multiscatter GGX Glass and Principled BSDF shows a seam in rendering that shouldn't be thereIf you move the camera in this report's file, you get the same artifacting. They're just elongated in the cylinder's direction.
Can folks here re-test using 4.0. Various changes to Multiscatter GGX have occurred recently and the seam seems to be gone.
I closed my bug report as it's now been solved in 4.0 alpha.@Jesse Yurkovich #85259
This appears to be fixed.