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Blender Mirror Vertex Bug #116183

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opened 2023-12-14 12:01:58 +01:00 by BunnyLian · 3 comments
BunnyLian commented 2023-12-14 12:01:58 +01:00
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System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1080 Ti/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 537.58

Blender Version
Broken: version: 4.0.2, branch: blender-v4.0-release, commit date: 2023-12-05 07:41, hash: 9be62e85b727
Worked: (newest version of Blender that worked as expected)

Short description of error
Blender has a bug when mirroring vertex groups on meshes with coincident points.

Exact steps for others to reproduce the error

  1. Open the file I uploaded.
  2. Select Plane and switch to Weight Paint mode (observe weight changes more clearly)
  3. Select the vertex group [Group] and mirror it (use Mirror Vertex Group)
  4. You can now see that the vertex group is not mirrored correctly.

The squares are not connected together, they are disconnected in the middle.
I found that with all these disconnected objects they were not able to mirror the vertex group properly. And I tried 4.1.0 Alpha version and 3.6.5 version, same result.

And other similar mirror moves will go wrong.

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: NVIDIA GeForce GTX 1080 Ti/PCIe/SSE2 NVIDIA Corporation 4.6.0 NVIDIA 537.58 **Blender Version** Broken: version: 4.0.2, branch: blender-v4.0-release, commit date: 2023-12-05 07:41, hash: `9be62e85b727` Worked: (newest version of Blender that worked as expected) **Short description of error** Blender has a bug when mirroring vertex groups on meshes with coincident points. <video src="/attachments/6206bf21-8f43-4e0e-9a0d-d806ab915879" controls></video> **Exact steps for others to reproduce the error** 1. Open the file I uploaded. 2. Select Plane and switch to Weight Paint mode (observe weight changes more clearly) 3. Select the vertex group [Group] and mirror it (use Mirror Vertex Group) 4. You can now see that the vertex group is not mirrored correctly. The squares are not connected together, they are disconnected in the middle. I found that with all these disconnected objects they were not able to mirror the vertex group properly. And I tried 4.1.0 Alpha version and 3.6.5 version, same result. And other similar mirror moves will go wrong.
bugReport.blend
842 KiB
2023-12-14 19-47-01.mp4
1.4 MiB
BunnyLian added the
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 labels 2023-12-14 12:01:59 +01:00
BunnyLian commented 2023-12-14 12:12:05 +01:00
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This problem I encountered when making hair for my cartoon character. I merged the hair into one object, but each piece of hair is separate, which means I can select each hair individually using the L key. If I merge all the points where they are connected, I won't be able to control them better with bones. So I think this issue should be taken seriously.

This problem I encountered when making hair for my cartoon character. I merged the hair into one object, but each piece of hair is separate, which means I can select each hair individually using the L key. If I merge all the points where they are connected, I won't be able to control them better with bones. So I think this issue should be taken seriously.
Snipaste_2023-12-14_19-06-23.png
1.4 MiB
Snipaste_2023-12-14_19-06-23.png
Germano Cavalcante commented 2023-12-14 18:57:24 +01:00
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I can confirm and I have a solution for the issue with the transformation.
The issue with vertex weights has a completely different system.
Each issue needs to be reported separately.

I can confirm and I have a solution for the issue with the transformation. The issue with vertex weights has a completely different system. Each issue needs to be reported separately.
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Germano Cavalcante added
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 labels 2023-12-14 18:57:39 +01:00
Hans Goudey added
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 labels 2023-12-14 19:11:07 +01:00
Campbell Barton commented 2023-12-15 08:16:38 +01:00
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Closing this report as exactly overlapping vertices aren't supported, this is a limitation with the current method, not an error in the code.

@mano-wii patch looks promising, so discussion can continue there.

Closing this report as exactly overlapping vertices aren't supported, this is a limitation with the current method, not an error in the code. @mano-wii patch looks promising, so discussion can continue there.
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 labels 2023-12-15 08:16:43 +01:00
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Reference: blender/blender#116183
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