Array/Skin-Modifier-Combo causes crash #59770
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Reference: blender/blender#59770
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System Information
Operating system: Linux Mint 19
Graphics card: GT630
Blender Version
Broken:
2.80 (sub 39), branch: blender2.8, commit date: 2018-12-20 23:46, hash:
7a26e930a8
Short description of error
Please try to toggle the "visibility" of the skin modifier in my simple file. It crashes instantly and repeatingly:
Procedural leaves feathered1.blend
Added subscriber: @user1
I think blender wants to tell me that i can't have start- and endcap that are already skinned, because then they will be skinned twice. If i delete the skin modifier from the start- and endcap, it stops crashing:
...while the result is unexpected though.
Added subscriber: @ZedDB
I'm getting an asset if I leave the subdiv modifier on:
BLI_assert failed: /home/zed/programmering/blender_master/blender/source/blender/modifiers/intern/MOD_skin.c:982, add_poly(), at 'v1 != v2 && v1 != v3 && v1 != v4'
And this segfault if I toggle it off:
Added subscriber: @ideasman42
Added subscriber: @mont29
There are several issues going on here I think, one being that 'root vertex' skin info is not preserved for start/end caps geometries - maybe because we are using fully evaluated data for those, which iirc do not preserve that layer. This should be quite easy to fix, as modifiers can now request data layers from the depsgraph.
But also looks like the general skinning code is fairly fragile in case of complicated geometry, and tends to crash instead of gracefully failing with a nice error message…
Added subscriber: @panosz
A crash also occurs when I have a Screw modifier in an object, use it as start/end cap in Array modifier and try to change the Steps. This does not happen in 2.82 only in 2.83beta and 2.90
Here is a test model to reproduce the problem. Box.blend
2.83 apparently already had a fix for
Procedural leaves feathered1.blend
crashing.Box.blend
needs to be set up a little differently nowdays, see #107353 (apparently now only start caps show, the file uses end caps), in any case it would be good to report this seprtely if this is still an issue.Will close this as resolved, but of course feel free to comment again if issues persist in fresh builds from https://builder.blender.org/download/daily/ -- we can always reopen in such case.