Deleted vertex groups reappearing during weight paint #100637

New Issue

Matt · 2022-08-26T04:30:10+02:00

Matt commented

2022-08-26 04:30:10 +02:00

System Information
Operating system: Windows-10-10.0.19043-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 2070 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 516.59

Blender Version
Broken: version: 3.2.1, branch: master, commit date: 2022-07-05 15:44, hash: a2d59b2dac
Worked: (newest version of Blender that worked as expected)

Short description of error
Deleted vertex groups reappearing during weight paint

Exact steps for others to reproduce the error
I created a leg mesh, I gave it 3 vertex groups to identify it as the right leg, I gave it an armature. I copied the right leg and mirrored it to create the left leg. I then renamed the vertex groups accordingly to identify this as a left leg.

Upon then clicking in the viewport to paint a weight on the mesh the vertex that was renamed triggers its old name to reappear as a new vertex group with its own weight.

I try to remove the vertex group though it always comes back. It does this for every vertex group. Each one triggers an old group to reappear.

I export this as a glTF after removing the phantom vertex groups and threeJS seems to still see the phantom groups and their weights even though I "removed" them causing the mesh to distort. Albeit the glTF viewers that I have used do not see this. I suppose the distortion occurs after the armatures are used in the scene?

leg issue.blend

**System Information** Operating system: Windows-10-10.0.19043-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 2070 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 516.59 **Blender Version** Broken: version: 3.2.1, branch: master, commit date: 2022-07-05 15:44, hash: `a2d59b2dac` Worked: (newest version of Blender that worked as expected) **Short description of error** Deleted vertex groups reappearing during weight paint **Exact steps for others to reproduce the error** I created a leg mesh, I gave it 3 vertex groups to identify it as the right leg, I gave it an armature. I copied the right leg and mirrored it to create the left leg. I then renamed the vertex groups accordingly to identify this as a left leg. Upon then clicking in the viewport to paint a weight on the mesh the vertex that was renamed triggers its old name to reappear as a new vertex group with its own weight. I try to remove the vertex group though it always comes back. It does this for every vertex group. Each one triggers an old group to reappear. I export this as a glTF after removing the phantom vertex groups and threeJS seems to still see the phantom groups and their weights even though I "removed" them causing the mesh to distort. Albeit the glTF viewers that I have used do not see this. I suppose the distortion occurs after the armatures are used in the scene? ![image.png](https://archive.blender.org/developer/F13417862/image.png) [leg issue.blend](https://archive.blender.org/developer/F13417853/leg_issue.blend)

Matt commented

2022-08-26 04:30:10 +02:00

Added subscriber: @dude_its_matt_g

Pratik Borhade commented

2022-08-26 07:10:01 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

Philipp Oeser commented

2022-08-26 11:02:15 +02:00

Added subscribers: @PratikPB2123, @lichtwerk

Philipp Oeser commented

2022-08-26 11:02:15 +02:00

Not sure I follow.
What are the steps exactly from opening that file?
@PratikPB2123 : should this be tagged #animation_rigging (rather then #sculpt_paint_texture) ?

Not sure I follow. What are the steps exactly from opening that file? @PratikPB2123 : should this be tagged #animation_rigging (rather then #sculpt_paint_texture) ?

Pratik Borhade commented

2022-08-26 11:26:22 +02:00

Open .blend file
Switch to weight paint mode
select any vertex group -> Paint on mesh (new vertex group will be created. If we remove it, it'll appear again on next stroke)
#100637.blend

- Open .blend file - Switch to weight paint mode - select any vertex group -> Paint on mesh (new vertex group will be created. If we remove it, it'll appear again on next stroke) [#100637.blend](https://archive.blender.org/developer/F13418276/T100637.blend)

Pratik Borhade commented

2022-08-26 11:31:05 +02:00

Looks like this occurs because symmetry along X is enabled

Matt commented

2022-08-27 04:47:17 +02:00

Welp. That was quite silly. Thank you!

Matt commented

2022-08-27 04:47:50 +02:00

Changed status from 'Confirmed' to: 'Resolved'

Matt closed this issue

2022-08-27 04:47:50 +02:00

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Deleted vertex groups reappearing during weight paint #100637