Un-subdivide operator damages UVs #87256
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Reference: blender/blender#87256
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System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1080 with Max-Q Design/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 465.89
Blender Version
Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-04-06 03:08, hash:
3f3b4745b6Short description of error
Original
Unsubdivided Level 2
Exact steps for others to reproduce the error
unsubdivide UVs.blend
Press Ctrl+E / Un-Subdivide
Set operator to step 2 or 4
Added subscriber: @zanqdo
Added subscriber: @HDMaster84
The problem is, that unsubdivide is currently executed multiple times one after the other, as many times as you specified in "iterations". So after one unsubdivision you get this criss-cross pattern, where there is really no way to not mess up your UV's and the next iteration has to work with that. So a "fix" here would look more like a full redesign of unsubdivision.
So this is probably a known issue.
Added subscriber: @lichtwerk
Changed status from 'Needs Triage' to: 'Confirmed'
Yes, this looks like a (unfortunate) limitation of the algorithm, but will confirm for now and let the modeling module decide on how to proceed with this.
Added subscriber: @PMA33
Confirmation that it is also a big mess using unsubdivision with UDIMs ....