Blender 3.0 doesn't save vertex groups from linked objects #93778

New Issue

Matteo GH · 2021-12-07T00:06:23+01:00

Matteo GH commented

2021-12-07 00:06:23 +01:00

System Information
Operating system: Windows-10-10.0.19042-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 2070 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 471.68

Blender Version
Broken: version: 3.0.0, branch: master, commit date: 2021-12-02 18:35, hash: f1cca30557
Worked: (newest version of Blender that worked as expected)

Short description of error
When saving a .blend file with linked meshes form a 2.93 file, vertex groups are lost.

Exact steps for others to reproduce the error

Make a new file in 2.93 with an object with vertex groups
Open Blender 3.0 and link the object from the original file
Make the object local (not the mesh, only the object)
Save the file
Revert/open the file again and the vertex groups are missing

This totally destroyed an animation file I was working on.

**System Information** Operating system: Windows-10-10.0.19042-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 2070 SUPER/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 471.68 **Blender Version** Broken: version: 3.0.0, branch: master, commit date: 2021-12-02 18:35, hash: `f1cca30557` Worked: (newest version of Blender that worked as expected) **Short description of error** When saving a .blend file with linked meshes form a 2.93 file, vertex groups are lost. **Exact steps for others to reproduce the error** 1) Make a new file in 2.93 with an object with vertex groups 2) Open Blender 3.0 and link the object from the original file 3) Make the object local (not the mesh, only the object) 4) Save the file 5) Revert/open the file again and the vertex groups are missing This totally destroyed an animation file I was working on.

Matteo GH commented

2021-12-07 00:06:23 +01:00

Added subscriber: @GH-7

blender-admin commented

2021-12-07 00:06:23 +01:00

#94424 was marked as duplicate of this issue

Germano Cavalcante commented

2021-12-13 16:20:39 +01:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2021-12-13 16:20:39 +01:00

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

Germano Cavalcante commented

2021-12-13 16:20:39 +01:00

Thanks for the report, I can confirm.
This is the file with the Vertex Group object that I used for linking:
cube-vgroup_293-6.blend

When reopening the new file, in fact the vertex Group disappeared.

Thanks for the report, I can confirm. This is the file with the Vertex Group object that I used for linking: [cube-vgroup_293-6.blend](https://archive.blender.org/developer/F12737558/cube-vgroup_293-6.blend) When reopening the new file, in fact the vertex Group disappeared.

Bastien Montagne commented

2021-12-23 10:27:34 +01:00

Added subscribers: @HooglyBoogly, @mont29

Hans Goudey was assigned by Bastien Montagne

2021-12-23 10:27:34 +01:00

Bastien Montagne commented

2021-12-23 10:27:34 +01:00

Think this is a consequence of the refactor of vgroups in 3.0 (3b6ee8cee7), @HooglyBoogly will let you check that?

Note that there may not be a proper way to fix this, 3.0 is a compatibility-breaking release, while we do our best to ensure at least the backward compatibility, there are cases where this is just not possible.

Think this is a consequence of the refactor of vgroups in 3.0 (3b6ee8cee7), @HooglyBoogly will let you check that? Note that there may not be a proper way to fix this, 3.0 is a compatibility-breaking release, while we do our best to ensure at least the backward compatibility, there are cases where this is just not possible.

Hans Goudey commented

2021-12-23 22:40:33 +01:00

I don't think it's possible to fix this. Here's what happens in the two cases:

Object and mesh are linked

Versioning code runs to move vertex group names to object data
Versioning code finds the object and the mesh in the linked Main
The in-memory mesh has the vertex groups, since versioning was applied

Object is local, mesh is linked

Versioning code only finds the mesh in the 2.93 file's database.
Since versioning code has no object, it cannot move vertex group names
The local object has no vertex group names after the file was saved and reopened.
Now the in-memory mesh has no vertex group names

I set this as a known issue, but I would be fine with archiving the report too.

I don't think it's possible to fix this. Here's what happens in the two cases: **Object and mesh are linked** - Versioning code runs to move vertex group names to object data - Versioning code finds the object and the mesh in the linked `Main` - The in-memory mesh has the vertex groups, since versioning was applied **Object is local, mesh is linked** - Versioning code only finds the mesh in the 2.93 file's database. - Since versioning code has no object, it cannot move vertex group names - The local object has no vertex group names after the file was saved and reopened. - Now the in-memory mesh has no vertex group names I set this as a known issue, but I would be fine with archiving the report too.

Bastien Montagne commented

2021-12-24 17:21:29 +01:00

@HooglyBoogly Ah thanks for the investigation, was afraid something like that would be the answer...

Think this report should be archived then, and release notes of 3.0 should be updated (probably add a new section in Core section, with a compatibility breakage note).

@HooglyBoogly Ah thanks for the investigation, was afraid something like that would be the answer... Think this report should be archived then, and release notes of 3.0 should be updated (probably add a new section in Core section, with a compatibility breakage note).

Hans Goudey commented

2021-12-24 17:49:58 +01:00

Changed status from 'Confirmed' to: 'Archived'

Hans Goudey closed this issue

2021-12-24 17:49:58 +01:00

Hans Goudey commented

2021-12-24 17:49:58 +01:00

Done: https://wiki.blender.org/wiki/Reference/Release_Notes/3.0/Core#Compatibility

Bastien Montagne commented

2021-12-29 14:34:12 +01:00

Added subscribers: @SpectreFirst, @lichtwerk, @PratikPB2123

Alex commented

2021-12-30 13:09:18 +01:00

All right, since it's not possible to easily fix the problem, it seems I've found a workaround so in case someone else encounters that problem:

Open the initial file you are linking FROM (for example, a character model or an asset pack) in Blender 3.x and save it (to the same file or create a copy if you want to keep both versions for 2.9 and 3.0) so vertex groups in that file will be moved to where they belong in 3.x
Load your file where this initial file is linked TO (for example, your main scene). I've tried that with several of my scenes and it seems to be working, I've decided to keep my files for 2.9 as well so I've just made copies of them for 3.0 and used Relocate function in Outliner to relink them to my scenes.

All right, since it's not possible to easily fix the problem, it seems I've found a workaround so in case someone else encounters that problem: 1. Open the initial file you are linking FROM (for example, a character model or an asset pack) in Blender 3.x and save it (to the same file or create a copy if you want to keep both versions for 2.9 and 3.0) so vertex groups in that file will be moved to where they belong in 3.x 2. Load your file where this initial file is linked TO (for example, your main scene). I've tried that with several of my scenes and it seems to be working, I've decided to keep my files for 2.9 as well so I've just made copies of them for 3.0 and used Relocate function in Outliner to relink them to my scenes.

Thomas Dinges added this to the 3.0 milestone 2023-02-08 15:58:47 +01:00

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Blender 3.0 doesn't save vertex groups from linked objects #93778