Dark Poly spot bug in External renderer #80835
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Reference: blender/blender#80835
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System Information
Operating system: Windows 10
Graphics card: RTX 2060S
Blender Version
blender 2.83 LTS and 2.9 official
Short description of error
Random black poly spot appear on object no matter if the normal are correctly set.
This happen to external renderer not CYCLES. Trying with luxcorerender here is the DEvs
Explanation :
This is a .ply file directly exported from Blender without the use of any LuxCore related code. It is a Blender bug as far as I can see.
The triangles have NaN UV coordinates:
You can report the problem to Blender developers by providing this file a telling them to export in .ply format and check the UV coordinates (aka ST coordinates).
However they may be not able to track the problem from there because the NaN may be the result of the process used to build the mesh (so they may be unable to track what tool is broken and has generated the NaN).
Exact steps for others to reproduce the error
This blend file contain a mesh with the error. You need to have Luxcorerender installed : Luxcore download
Darkspot bug.blend
Added subscriber: @sharlybg
Added subscriber: @rjg
While I haven't tested this yet, this underlying cause for the error might be related to #79775.
Added subscriber: @brecht
Changed status from 'Needs Triage' to: 'Needs User Info'
This is correct. This bug report requires steps to get a mesh into a state where UVs are NaN, otherwise we can't investigate it.
This comment was removed by @sharlybg
Closed as duplicate of #79775