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Maniphest T90746

Vertex Group Missing When opening blend file saved in 3.0, on a lower blender version
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Description

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: Intel(R) UHD Graphics Intel 4.5.0 - Build 27.20.100.8681

Blender Version
Broken: version: 2.93.2, branch: master, commit date: 2021-08-03 05:58, hash: rB1eb06de2607a
Worked: None So far

Short description of error
Save a file in 3.0, open saved file in an older blender version (2.83 and below),
all vertex groups are missing.

Exact steps for others to reproduce the error

  • open a 2.83 file in 3.0
  • save file in 3.0
  • re open file in 2.83, and the vertex group are missing.

Related Objects

Event Timeline

Franklyn Afeso (afeso) created this task.Aug 18 2021, 9:59 AM
Pratik Borhade (PratikPB2123) added a subscriber: Pratik Borhade (PratikPB2123).Aug 18 2021, 10:29 AM

Can confirm. Possibly caused by the commit rB3b6ee8cee708: Refactor: Move vertex group names to object data

Guess this is expected because message will be displayed after opening the file in older versions: File written by newer Blender binary (300.11), expect loss of data!

Pratik Borhade (PratikPB2123) added a comment.Aug 18 2021, 10:35 AM

Similar issues has been reported before:

Looking at the ISS's comment from T90441 I think the current behavior is expected. (Report can be closed I guess but will wait for others to check this)

Franklyn Afeso (afeso) added a comment.Aug 18 2021, 11:47 AM

Is there a way to get this back, cos even linking or appending the collection doesn't bring vertex groups

Henrik Dick (weasel) added a subscriber: Henrik Dick (weasel).Aug 18 2021, 12:41 PM

remember 3.0 is not meant for production yet, there are warning banners for a reason. As a workaround you could export your model in 3.0 and import it in 2.93 using some fileformat which captures vertex groups data.

Franklyn Afeso (afeso) added a comment.Aug 18 2021, 3:57 PM

Ah Thanks.

I was testing it out, but mistakenly saved over my most recent update, and so far, it isn't nearly as stable, so I've been looking for a way to bring over my changes into 2.93.

Philipp Oeser (lichtwerk) closed this task as Archived.Aug 23 2021, 3:17 PM
Philipp Oeser (lichtwerk) added a subscriber: Philipp Oeser (lichtwerk).

It seems we have to close this, afaics there will not be ways to restore these (except for the workaround @Henrik Dick (weasel) mentioned).

Pratik Borhade (PratikPB2123) mentioned this in T92912: vertex groups get lost when opening a 3.0 file in Blender 2.93.Nov 10 2021, 11:15 AM
Isaac (yelzkizi) added a subscriber: Isaac (yelzkizi).Mar 31 2022, 8:30 PM

I fixed mine by creating a new file and appending all the mesh into the new file. the vertex groups were all there

Pratik Borhade (PratikPB2123) mentioned this in T97208: Copy object from 3.1 to any lower version delete "all vertex groups".Apr 11 2022, 8:13 AM