Delaunay Triangulation not robust enough #73171
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Reference: blender/blender#73171
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System Information
Operating system: linux, MacOs
Graphics card: n/a
Blender Version
Broken: 2.81
Worked: (optional)
As reported in this devtalk thread: https://devtalk.blender.org/t/delaunay-2d-cdt-robustness/10968
some uses of the new library routine BLI_delaunay_cdt_calc cause crashes.
Exact steps for others to reproduce the error
The thread has 5 scripts to run, each of which causes a crash.
Two of the bigger ones I have turned into a file that the delaunay unit test program knows how to read:
CIRCcdtinput.txt
CIRC2cdtinput.txt
The rest are more easily turned directly into unit tests.
Added subscriber: @howardt
I have been working on this for a while, and had already submitted one change that fixed the first crash, but the other reports showed that a more fundamental rethinking of the code was likely necessary. I am near a solution, but am putting this bug here so that there will be a record of why the rewrite was needed,
Changed status from 'Needs Triage' to: 'Confirmed'
Changed status from 'Confirmed' to: 'Resolved'
This was fixed with commit
2867c35d4e