Regression: Multires Unsubdivide destroys the vertex groups #93911

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opened 2021-12-09 17:58:29 +01:00 by kursad k · 8 comments

kursad k commented

2021-12-09 17:58:29 +01:00

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System Information
Operating system: Windows 10

Blender Version
Broken: 3.0 release, 3.0 (b42354672e)
Worked: 2.93LTS, 3.0 (cec103d5a9)

Short description of error

It seems like unsubdividing using the Multires Modifier destroys the vertex groups, interesthingly enough other kind of mesh data stays intact (like the vertex colors) after the same operation.

The Decimate modifier's Unsubdivide does not destroy the data, but using the Decimate modifiers not option in these kinds of usage because the multires one is about getting the prior subd levels for sculpting purposes.

Exact steps for others to reproduce the error

Load the .blend file
Select the torus
Multires->Unsibdivide
Move your mouse to the 3d viewport to get the UI update properly
The Vgroups are gone

multires_09122021_1051_52.blend

**System Information** Operating system: Windows 10 **Blender Version** Broken: 3.0 release, 3.0 (b42354672e) Worked: 2.93LTS, 3.0 (cec103d5a9) **Short description of error** It seems like unsubdividing using the Multires Modifier destroys the vertex groups, interesthingly enough other kind of mesh data stays intact (like the vertex colors) after the same operation. The Decimate modifier's Unsubdivide does not destroy the data, but using the Decimate modifiers not option in these kinds of usage because the multires one is about getting the prior subd levels for sculpting purposes. [byUQjUlY19.mp4](https://archive.blender.org/developer/F12721611/byUQjUlY19.mp4) **Exact steps for others to reproduce the error** Load the .blend file Select the torus Multires->Unsibdivide Move your mouse to the 3d viewport to get the UI update properly The Vgroups are gone [multires_09122021_1051_52.blend](https://archive.blender.org/developer/F12721644/multires_09122021_1051_52.blend)

kursad k commented

2021-12-09 17:58:29 +01:00

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Added subscriber: @kursadk

Added subscriber: @kursadk

Richard Antalik commented

2021-12-09 21:28:36 +01:00

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Added subscriber: @iss

Added subscriber: @iss

Richard Antalik commented

2021-12-09 21:28:36 +01:00

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

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

Richard Antalik commented

2021-12-09 21:28:36 +01:00

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Seems to be broken between cec103d5a9 and b42354672e

Seems to be broken between cec103d5a9 and b42354672e

Philipp Oeser removed the

label 2023-02-09 15:28:06 +01:00

Pratik Borhade referenced this issue

2023-03-07 05:39:21 +01:00

Multiresolution modifier: Unsubdivide button deletes vertex weights from object #105517

Pratik Borhade changed title from ~~Multires Unsubdivide destroys the vertex groups~~ to Regression: Multires Unsubdivide destroys the vertex groups

2023-03-07 05:44:05 +01:00

SleepyEngi commented

2023-05-04 05:03:06 +02:00

Experiencing this as well, and discovered that the vertex group data is still there- but hidden, somehow. If you manually re-add the vertex groups, they have the same paint values they had before.

Experiencing this as well, and discovered that the vertex group data is still there- but hidden, somehow. If you manually re-add the vertex groups, they have the same paint values they had before.

SleepyEngi commented

2024-02-04 11:04:19 +01:00

Still broken in 4.0.2

Still broken in 4.0.2

kursad k commented

2024-02-04 19:46:32 +01:00

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Yeah I can confirm this, it still destroys data

Yeah I can confirm this, it still destroys data

SleepyEngi commented

2024-02-04 20:11:53 +01:00

I will say multires unsubdivide is particularly useful for sculpting; you can use it to apply the multires, mirror the sculpt perfectly, and the unsubdivide it back. Or to get the regular mesh's shape to be more true to the shape of the sculpt. Which is why this is an important feature to fix back

I will say multires unsubdivide is particularly useful for sculpting; you can use it to apply the multires, mirror the sculpt perfectly, and the unsubdivide it back. Or to get the regular mesh's shape to be more true to the shape of the sculpt. Which is why this is an important feature to fix back

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Reference: blender/blender#93911

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