Randomwalk SSS produce strange effect when far away from the world origin. #85986
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Reference: blender/blender#85986
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System Information
Operating system: windows 10
Graphics card: RTX 3090
Blender Version
Broken: 2.91.2 stable
The object with randomwalk SSS produce strange effect when far away from world origin.
When it's at world origin, it's ok. When moved 300 unit on x axis, it looks like the picture blow.
Exact steps for others to reproduce the error
Give an object randomwalk SSS and move it far from world origin.
Added subscriber: @NXSK
Added subscriber: @filedescriptor
Changed status from 'Needs Triage' to: 'Confirmed'
I can confirm this problem on the latest master as well. Seems like this is a floating-point precision issue
Added subscriber: @lichtwerk
Probably the same as #43835 (ray offsetting giving precission problems / render artifacts / cracks on far away geometry)
What about adding a switch between calculating based on world origin and camera position like redshift?
This function in redshift is called "render in camera space". It eliminates render issue by moving the scene around the camera so that numerical precision is maintained as much as possible.
Added subscriber: @Stefan_Werner
It would help to do the entire random walk in object space, not world space, including the ray offset.
Added subscriber: @brecht
Changed status from 'Confirmed' to: 'Resolved'
Precision here was improved, at least for the setup described in this report I see artifacts in 2.92 but not 3.0.
There's always further improvements that can be done, but will consider this particular bug report resolved.