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Maniphest T43122

Shrinkwrap modifier confusion on linked meshes
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Description

System Information
Windows 7 64, GTX 980

Blender Version
Broken: 9e963ae + 8a28895

Short description of error
A specific modifier setup on two linked meshes changes the Shrinkwrap-modifier-target of a third/not-linked mesh, if you go into Editmode of one linked mesh.

Exact steps for others to reproduce the error

LinkedMeshShrinkwrapBug.blend674 KBDownload

Steps:

  • Add two linked Cubes (Alt-D), put them on the same position.
    • Subsurf-Cube
    • Skin-Cube
  • Add another, not linked Cube, put it above the two Cubes.
    • Shrinkwrap-Cube

Modifier Setup:

Assign one half of the mesh to Group.

  • Select Skin-Cube.
    • Change back and forth between Object and Editmode.
Problem: Shrinkwrap-Cube jumps from its target to the other linked wrong mesh. Move vertices to see it more easily.
Note: Subsurf levels seem to have an influence - only higher levels enforce this bug. To check, change simplify while in Skin-Cubes Editmode.
Note: I think Edge Split isnt really needed, it only increases the occurrence. (As it could also be so for the other modifiers) But i found out for a simple example its necessary.

Revisions and Commits

rB Blender
rB0b5a64fe7f4b Fix T43122: Shrinkwrap target, wrong linked object
rB2d2bfd416b55 Fix T43122: Shrinkwrap target, wrong linked object

Related Objects

Event Timeline

Karja Krähwald (karja) created this task.Jan 4 2015, 4:40 PM
Karja Krähwald (karja) raised the priority of this task from to 90.
Karja Krähwald (karja) updated the task description. (Show Details)
Karja Krähwald (karja) added projects: BF Blender, Modifiers.
Karja Krähwald (karja) edited a custom field.
Karja Krähwald (karja) added a subscriber: Karja Krähwald (karja).
Julian Eisel (Severin) added subscribers: Andre Susano Pinto (jaguarandi), Campbell Barton (campbellbarton), Julian Eisel (Severin).Jan 5 2015, 5:40 PM

I checked that in code, but it doesn't seem like it's using the wrong object it more looks like the object using skin modifier isn't aware of the subsurf modifier on the other linked object. Or said differently: The shrinkwrap modifier can't access the derived mesh of the other linked object in edit mode.

@Campbell Barton (campbellbarton) can you confirm that? Mind having a look? (don't think @Andre Susano Pinto (jaguarandi) is available :/)

Julian Eisel (Severin) assigned this task to Campbell Barton (campbellbarton).Jan 5 2015, 5:40 PM
Julian Eisel (Severin) lowered the priority of this task from 90 to 50.
Campbell Barton (campbellbarton) changed the task status from Unknown Status to Resolved.Jan 6 2015, 4:04 AM
Campbell Barton (campbellbarton) added a commit: rB2d2bfd416b55: Fix T43122: Shrinkwrap target, wrong linked object.

Closed by commit rB2d2bfd416b55.

Sergey Sharybin (sergey) added a commit: rB0b5a64fe7f4b: Fix T43122: Shrinkwrap target, wrong linked object.Jan 6 2015, 10:45 AM