EEVEE-Next: Shadow Terminator Artifacts #121194
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Reference: blender/blender#121194
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System Information
Operating system: Windows 11
Graphics card: 4060ti
Blender Version
Broken: 4.2
3e814bc702Worked: 4.2
1d9d0f0056Short description of error
Build from few days ago:
Today:
Still very visible if the light has small radius:
The only setting that affects the artifacts is
shadow filter radius, they also completely disappear if shadows are turned off.Might be caused by #121088
Exact steps for others to reproduce the error
N/A
Interesting, this comes from the slope bias used to avoid the artifact below. The bias shifts back the object from the shadow projection perspective. But this bias is not done in the direction of the tracing so the tracing actually intersect with the shifted version of the object. Disabling the slope bias almost completely fixes the issue but it breaks these two cases mentioned in the task.
I think we can just decide that the PCF overshadowing on zero slope receiver is just a limitation of the new shadows and remove the slope bias. This would also help with this issue.
Artifacts are still present on the latest build.
(Light softness is turned all the way down in this image, same file)
Yes, can still confirm
The remaining artifacts are caused by the shadow terminator issue. We need a user facing bias for this case since it depends on the geometry. I still have to design it.
Also, reducing the shadow softness will break PBR rules which creates artifacts. I'm also looking into a solution for this.
The artifacts are present regardless, I just noticed it makes them more visible.
Yes. That's what my first paragraph was about. We need a geometry bias of some sort.
This issue has been solved by the recent shadow cleanup/refactors.
Please reopen if you can reproduce it.