vertex group Names gone when opening file back in older blender version #93803

New Issue

Nuno Estanqueiro · 2021-12-07T11:38:04+01:00

Nuno Estanqueiro commented

2021-12-07 11:38:04 +01:00

System Information
Operating system: Linux Mint
Graphics card: RTX2080

Blender Version
Broken:300.42

regression is expected to have data loss, but not sure if this is actually fixable:
vertex group list of names is gone when reopening a file that was saved with 3.0 in 2.93,6 The groups are saved, and if one recreates the group, the vertex selection is still there... just the name list is empty

Exact steps for others to reproduce the error
create one or more vertex groups in a file in 3.0, save and reopen in 2.93, check empty list of vertex group, and in weight paint create new groups... check that info is still there from original file, just name is gone.
Also happens if you open and save a 2.93 file with vertex groups and save in 3.0... reopening in 2.93 will have names wiped out, but info still there...

if behavior is expected because of regression sorry for the erroneous bug report, but blender is known for great regression features, and these seems simple, as vertex info is actually saved.

thank you for your time and effort in making blender such a great tool

Attached is a simple file to re-save in 3.0 and re-open in 2.93, pointing the problem
bug.blend

**System Information** Operating system: Linux Mint Graphics card: RTX2080 **Blender Version** Broken:300.42 regression is expected to have data loss, but not sure if this is actually fixable: vertex group list of names is gone when reopening a file that was saved with 3.0 in 2.93,6 The groups are saved, and if one recreates the group, the vertex selection is still there... just the name list is empty **Exact steps for others to reproduce the error** create one or more vertex groups in a file in 3.0, save and reopen in 2.93, check empty list of vertex group, and in weight paint create new groups... check that info is still there from original file, just name is gone. Also happens if you open and save a 2.93 file with vertex groups and save in 3.0... reopening in 2.93 will have names wiped out, but info still there... if behavior is expected because of regression sorry for the erroneous bug report, but blender is known for great regression features, and these seems simple, as vertex info is actually saved. thank you for your time and effort in making blender such a great tool Attached is a simple file to re-save in 3.0 and re-open in 2.93, pointing the problem [bug.blend](https://archive.blender.org/developer/F12703914/bug.blend)

Nuno Estanqueiro commented

2021-12-07 11:38:04 +01:00

Added subscriber: @nuno.estanqueiro

Germano Cavalcante commented

2021-12-07 15:58:22 +01:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2021-12-07 15:58:22 +01:00

This is the side effect of changing the way to store vertex groups in the file.
See blender/blender@3b6ee8cee7.

There is no conventional way to fix this problem unless we edit code from previous versions.

This is the side effect of changing the way to store vertex groups in the file. See blender/blender@3b6ee8cee7. There is no conventional way to fix this problem unless we edit code from previous versions.

Germano Cavalcante commented

2021-12-07 15:58:34 +01:00

Closed as duplicate of blender/blender#90441

Germano Cavalcante closed this issue

2021-12-07 15:58:34 +01:00

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vertex group Names gone when opening file back in older blender version #93803