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Maniphest T74195

Blender crash when curve has dense mesh and solidify modifier
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Description

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 970/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 436.48

Blender Version
Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-02-12 16:20, hash: rB77d23b0bd76f

There is problem with small curves and Solidify modifier. When curve has dense mesh and Solidify is set to COMPLEX, they crashes Blender.

0. Download file

bug_svg_solidify_03.blend555 KBDownload

  1. Select DG letters.
  2. Go to curve properites on right.
  3. Increase parameter RESOLUTION PREVIEW from 1 to 5 or more.
  4. Crash :(

Some curves require to set Resolution Preview to 30 or even 100. I can't reproduce crash with text-objects.

Revisions and Commits

rB Blender
D7214rBee4645207f76 Fix T74195: Solidify Complex Dissolve Crash.

Related Objects

Event Timeline

Piotr Załóg (piotr) renamed this task from Blender crash when curve has dense mesh and solidify midify modifier to Blender crash when curve has dense mesh and solidify modifier.Feb 25 2020, 1:10 PM
Piotr Załóg (piotr) created this task.
Ankit Meel (ankitm) changed the task status from Needs Triage to Confirmed.EditedFeb 25 2020, 5:29 PM
Ankit Meel (ankitm) added a subscriber: Ankit Meel (ankitm).

BLI assert failed

source/blender/modifiers/intern/MOD_solidify_nonmanifold.c:936, MOD_solidify_nonmanifold_applyModifier(), at 'eg_index < (unassigned_edges_len / 2)'
unassigned_edges_len	uint	5
eg_index	int	2
Bastien Montagne (mont29) assigned this task to Henrik Dick (weasel).Feb 26 2020, 5:12 PM
Bastien Montagne (mont29) changed the subtype of this task from "Report" to "Bug".
Bastien Montagne (mont29) added a project: Modeling.
Bastien Montagne (mont29) added subscribers: Henrik Dick (weasel), Campbell Barton (campbellbarton), Bastien Montagne (mont29).

There is clearly an algorithmic flaw here, but this is fairly complicated (and totally under-documented) code, not easy to follow...

@Henrik Dick (weasel) can you please check on that? Thanks.

Henrik Dick (weasel) added a revision: D7214: Fix Solidify Complex Dissolve Crash (fixes T74195).Mar 22 2020, 7:41 PM
Bastien Montagne (mont29) mentioned this in D7214: Fix Solidify Complex Dissolve Crash (fixes T74195).Mar 23 2020, 3:14 PM
Bastien Montagne (mont29) mentioned this in T75032: New complex solidify algorithm handles poorly merging threshold of small geometry details..Mar 23 2020, 3:21 PM
Bastien Montagne (mont29) closed this task as Resolved by committing rBee4645207f76: Fix T74195: Solidify Complex Dissolve Crash..Mar 23 2020, 3:26 PM
Bastien Montagne (mont29) added a commit: rBee4645207f76: Fix T74195: Solidify Complex Dissolve Crash..
Henrik Dick (weasel) mentioned this in T81331: Cleanup Complex Solidify TODO.Sep 30 2020, 6:36 PM