Undoing the removal of a vertex group in edit mode changes other vertex groups and doesnt bring the removed vertex group back #63434

New Issue

Zachary · 2019-04-09T20:13:02+02:00

Zachary commented

2019-04-09 20:13:02 +02:00

System Information
Operating system: Linux-5.4.13-201.fc31.x86_64-x86_64-with-fedora-31-Thirty_One 64 Bits
Graphics card: GeForce GTX 970M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 440.44

Blender Version
Broken: version: 2.83 (sub 2), branch: master (modified), commit date: 2020-02-06 03:03, hash: 02226ef653
Worked: (optional)

Short description of error
Undoing a vertex group changes the rest. The video should show the issue. There's 3 vertex groups, A = A, B = B and C = C. If you delete A, B = B and C = C. If you delete A and then undo it, B = A and C = B.

https://youtu.be/Ty9U5rj_6Sw

#63434.blend

Open File
you should be in editmode
remove the zero_weight vertex group
Undo {key Ctrl Z}
zero_weight vertex group is not back
half_weight vertex group now has zero weights
full_weight vertex group now has half weights

**System Information** Operating system: Linux-5.4.13-201.fc31.x86_64-x86_64-with-fedora-31-Thirty_One 64 Bits Graphics card: GeForce GTX 970M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 440.44 **Blender Version** Broken: version: 2.83 (sub 2), branch: master (modified), commit date: 2020-02-06 03:03, hash: `02226ef653` Worked: (optional) **Short description of error** Undoing a vertex group changes the rest. The video should show the issue. There's 3 vertex groups, A = A, B = B and C = C. If you delete A, B = B and C = C. If you delete A and then undo it, B = A and C = B. https://youtu.be/Ty9U5rj_6Sw [#63434.blend](https://archive.blender.org/developer/F8325231/T63434.blend) - Open File - you should be in editmode - remove the `zero_weight` vertex group - Undo {key Ctrl Z} - `zero_weight` vertex group is not back - `half_weight` vertex group now has zero weights - `full_weight` vertex group now has half weights

Zachary commented

2019-04-09 20:13:02 +02:00

Added subscriber: @AFWS

Sebastian Parborg commented

2019-04-09 22:37:02 +02:00

Added subscriber: @ZedDB

Sebastian Parborg commented

2019-04-09 22:37:02 +02:00

I can't reproduce this on my end.
recording.mp4

Is there anything I'm doing wrong?

I can't reproduce this on my end. [recording.mp4](https://archive.blender.org/developer/F6923552/recording.mp4) Is there anything I'm doing wrong?

Zachary commented

2019-04-10 14:25:11 +02:00

@ZedDB

Try doing it in edit mode. I see you're doing this in weight paint mode. I can get the same results as you if I'm in weight paint. Looks like this is a undo issue in edit mode.

@ZedDB Try doing it in edit mode. I see you're doing this in weight paint mode. I can get the same results as you if I'm in weight paint. Looks like this is a undo issue in edit mode.

Zachary changed title from ~~Undoing a vertex group changes the rest~~ to Undoing a vertex group in edit mode

2019-04-10 14:32:27 +02:00

Campbell Barton was assigned by Sebastian Parborg

2019-04-10 15:35:57 +02:00

Sebastian Parborg commented

2019-04-10 15:35:57 +02:00

Right, if you are in edit mode it breaks.

Campbell Barton was unassigned by Dalai Felinto

2019-12-23 16:34:43 +01:00

Dalai Felinto commented

2019-12-23 16:34:43 +01:00

Added subscriber: @ideasman42

Richard Antalik commented

2020-01-30 00:56:14 +01:00

Added subscriber: @iss

Richard Antalik commented

2020-01-30 00:56:14 +01:00

Changed status from 'Confirmed' to: 'Needs User Info'

Richard Antalik commented

2020-01-30 00:56:14 +01:00

I have re-triaged this report and can not reproduce it (even in edit mode).
Can you please check if this is still an issue in latest build?
https://builder.blender.org/download/

I have re-triaged this report and can not reproduce it (even in edit mode). Can you please check if this is still an issue in latest build? https://builder.blender.org/download/

Philipp Oeser commented

2020-02-06 10:46:08 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2020-02-06 10:46:08 +01:00

Changed status from 'Needs User Info' to: 'Confirmed'

Philipp Oeser commented

2020-02-06 10:46:08 +01:00

Can confirm, still an issue, will update report with example file and better repro steps

Philipp Oeser changed title from ~~Undoing a vertex group in edit mode~~ to Undoing the removal of a vertex group in edit mode changes other vertex groups and doesnt bring the removed vertex group back

2020-02-06 10:51:15 +01:00

Bastien Montagne commented

2020-09-24 11:49:02 +02:00

Added subscriber: @mont29

Bastien Montagne commented

2020-09-24 11:49:02 +02:00

This is a known issue actually, caused by design flaw in vgroups (they are stored partly in mesh, partly in object). Edit mesh undo steps cannot store undo data for anything else than the mesh, so to support this we'd need to either store a global memfile undo step (which is not possible currently in Edit mode afaik).

Workaround for now could be to forbid editing vgroup list in Edit mode, don't see anything we can do otherwise without some rather severe rework of part of undo code, which goes beyond a bugfix.

This is a known issue actually, caused by design flaw in vgroups (they are stored partly in mesh, partly in object). Edit mesh undo steps cannot store undo data for anything else than the mesh, so to support this we'd need to either store a global memfile undo step (which is not possible currently in Edit mode afaik). Workaround for now could be to forbid editing vgroup list in Edit mode, don't see anything we can do otherwise without some rather severe rework of part of undo code, which goes beyond a bugfix.

Henrik D. commented

2022-03-03 13:22:22 +01:00

Added subscriber: @HDMaster84

Henrik D. commented

2022-03-03 13:22:22 +01:00

@mont29 Even if undo of vertex group can be considered a known issue, the silent corruption of all the other vertex groups should be considered a bug and should get fixed (maybe by disabling the undo behavior here completely?).

Bastien Montagne commented

2022-03-03 14:29:01 +01:00

@HDMaster84 If you do have time to work on this, please feel free to assign it to yourself and then move this to bug. By definition 'bugs' are issues that are intended to be fixed within a reasonable time, otherwise (especially when current design is at core of the issue), they are 'known issues'.

Philipp Oeser removed the

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Undoing the removal of a vertex group in edit mode changes other vertex groups and doesnt bring the removed vertex group back #63434