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Maniphest T53206

Unexpected merging of vertex groups with different names
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Description

System Information
Win 7 64 bit

Blender Version
Broken: 2.79

Short description of error
Mesh called Array is using array modifier with start cap option, all vertices of it belong to "Mask" vgroup. Some vertices of Start Cap mesh belong to "Bevel" vgroup.

When I choose "Bevel" group in Bevel modifier, vertices that are not in this group somehow merging with "Mask" group of Array mesh.

Exact steps for others to reproduce the error
Open file, choose "Bevel" vgroup in Bevel modifier -> see how another mesh is masking

PS. Workaround is to create another empty vgroup in the Start cap mesh and place it before "Bevel" group

Vgroup.blend87 KBDownload

Revisions and Commits

rB Blender
AbandonedD3092 Array modifier: Do not merge vertex groups with different names
rBd9d3ed16a8c6 Fix T53206: Array modifier doesn't merge vgroups

Event Timeline

Serge Lyatin (SergeL) renamed this task from Unexpected merging of vertex groups to Unexpected merging of vertex groups with different names.Oct 30 2017, 5:04 PM
Serge Lyatin (SergeL) created this task.
ronan ducluzeau (zeauro) lowered the priority of this task from 90 to 50.Oct 31 2017, 11:19 AM
ronan ducluzeau (zeauro) added a subscriber: ronan ducluzeau (zeauro).

It looks like array modifier is not using name but index of vertex group.

It is interesting to be able to apply an effect depending of vertex group on cap and array after array modifier.
But yes ! Vertex groups with different names should not be merged.
Or, at least user should be warned.

Philip Holzmann (Foaly) added a revision: D3092: Array modifier: Do not merge vertex groups with different names.Mar 2 2018, 11:30 PM
Philip Holzmann (Foaly) added a subscriber: Philip Holzmann (Foaly).Mar 2 2018, 11:33 PM

I have added a patch, but I don't know if I did it correctly.
If you can see it: Is it okay to fix it that way?

Campbell Barton (campbellbarton) changed the task status from Unknown Status to Resolved by committing rBd9d3ed16a8c6: Fix T53206: Array modifier doesn't merge vgroups.Mar 6 2018, 12:10 AM
Campbell Barton (campbellbarton) added a commit: rBd9d3ed16a8c6: Fix T53206: Array modifier doesn't merge vgroups.