Segfault with hair particles cache and vgroups #40733
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Reference: blender/blender#40733
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System Information
openSUSE 12.3 64bits
NVIDIA 480GTX SC
AMD FX-8350
Blender Version
Broken:
9b83cebShort description of error
Crash using baked hair particles + vgroup control
Exact steps for others to reproduce the error
Open PROBLEMA8.blend
Press F12
If I remove the vgroups from the particle length and density the crasher is gone
If I click on Free Edit the crasher is gone too
Changed status to: 'Open'
Added subscriber: @zanqdo
Added subscriber: @BoscoMattel
Added subscriber: @LukasTonne
It looks like this is yet again an issue with the ParticleData.num fields exceeding the actual mesh data range. Here it might be caused by the
psys_render_setfunction being called to generate hair particles for the cycles render:https://developer.blender.org/diffusion/B/browse/master/intern/cycles/blender/blender_curves.cpp;4236e3bebf693912102f79102c1ae5389b7536c5$326
Somehow the data in the file seems corrupted: the values in particle 79 and following is way above the numTessFaces limit. Can't say where this originated from or why it causes crash only with length vgroups (density vgroup only works fine).
This issue was referenced by
d8b0470fd0Changed status from 'Open' to: 'Resolved'
Closed by commit
d8b0470fd0.Note that the "fix" is just a sanity check to avoid the crash. Investigating this takes to much time and doesn't yield results, the issues with this mesh mapping system pop up again and again ...