Bone constraint missing after relocating/remapping missing library #90924

New Issue

Dalai Felinto · 2021-08-25T17:45:15+02:00

Dalai Felinto commented

2021-08-25 17:45:15 +02:00

Blender Version
Broken: version: 2.79 and 3.0.0 Alpha, branch: master, commit date: 2021-08-25 08:10, hash: 452cc01932
Worked: - (never ?)

Short description of error
The child of bone constrain loses the "inverse" matrix the if you

How to re-create the sample files from scratch

New file, create a simple torus parented to an armature, save in torus.blend
New file, create a simple cube parented to an armature, animate the cube.
Link in + instance the torus + its armature, position on the top of the cube.
Add a child of constraint to the torus bone and set the cube bone as the parent.
Click on "Set Inverse".
Save as main.blend.

Exact steps for others to reproduce the error

main.blend
torus.blend

Rename torus.blend to child.blend
Open main.blend and remap the missing library. (in 3.0 you can right click in the broken library and "Relocate", in 2.79 you need to rename the path and save and re-open the file).
Boom, the local constraint is missing

**Blender Version** Broken: version: 2.79 and 3.0.0 Alpha, branch: master, commit date: 2021-08-25 08:10, hash: `452cc01932` Worked: - (never ?) **Short description of error** The child of bone constrain loses the "inverse" matrix the if you **How to re-create the sample files from scratch** 1. New file, create a simple torus parented to an armature, save in torus.blend 2. New file, create a simple cube parented to an armature, animate the cube. 3. Link in + instance the torus + its armature, position on the top of the cube. 4. Add a child of constraint to the torus bone and set the cube bone as the parent. 5. Click on "Set Inverse". 6. Save as main.blend. **Exact steps for others to reproduce the error** [main.blend](https://archive.blender.org/developer/F10325237/main.blend) [torus.blend](https://archive.blender.org/developer/F10325238/torus.blend) 7. Rename torus.blend to child.blend 8. Open main.blend and remap the missing library. (in 3.0 you can right click in the broken library and "Relocate", in 2.79 you need to rename the path and save and re-open the file). 9. Boom, the local constraint is missing

Dalai Felinto commented

2021-08-25 17:45:15 +02:00

Added subscriber: @dfelinto

Dalai Felinto commented

2021-08-25 17:45:33 +02:00

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

Dalai Felinto commented

2021-08-25 18:08:08 +02:00

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

Dalai Felinto commented

2021-08-25 18:08:08 +02:00

It seems that the bone constraint as a whole is removed when the linking is not found. So maybe the issue is not particular of the child of. Needs further investigation.

Dalai Felinto commented

2021-08-25 18:13:18 +02:00

Alright, confirmed that even in 2.79 all the bone constraints are removed from the proxy with the steps above.

Luciano Muñoz Sessarego commented

2021-08-25 18:16:50 +02:00

Added subscriber: @LucianoMunoz

Luciano Muñoz Sessarego commented

2021-08-25 18:16:50 +02:00

Yeah i remmeber hitting this bug back then, its pretty destructive.

Dalai Felinto commented

2021-08-25 18:27:14 +02:00

Talking to some artists, the main issue of Child Of is that of all constraints, this is the one that is harder to copy over, since there is no way to know which values are stored.

Regardless of a real fix (making the bone constraints not going away), I think we could have the stored inverse matrix shown in the UI somehow (in the worst case it can even be a Info icon that you mouse over and see the values - though that is not highly copy/pasteable).

Talking to some artists, the main issue of Child Of is that of all constraints, this is the one that is harder to copy over, since there is no way to know which values are stored. Regardless of a real fix (making the bone constraints not going away), I think we could have the stored inverse matrix shown in the UI somehow (in the worst case it can even be a Info icon that you mouse over and see the values - though that is not highly copy/pasteable).

Luciano Muñoz Sessarego commented

2021-08-25 18:46:47 +02:00

More so when its more than one constrain and often you'll have many

Dalai Felinto commented

2021-08-26 11:20:30 +02:00

Added subscriber: @mont29

Dalai Felinto commented

2021-08-26 11:20:30 +02:00

I talked to @mont29 and the problem of disappearing bone constraints also happens with library overrides.

Philipp Oeser commented

2021-08-31 10:27:53 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2021-08-31 10:27:53 +02:00

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

Philipp Oeser commented

2021-08-31 10:27:53 +02:00

Searched a bit, but not finding a real duplicate report.
Will confirm now.

Searched a bit, but not finding a real duplicate report. Will confirm now.

Philipp Oeser changed title from ~~Child of bone constrain "Inverse" matrix lost when linking problems~~ to Bone constraint missing after relocating/remapping missing library

2021-08-31 10:29:47 +02:00

Bastien Montagne commented

2021-09-03 15:24:54 +02:00

Changed status from 'Confirmed' to: 'Archived'

Bastien Montagne closed this issue

2021-09-03 15:24:54 +02:00

Bastien Montagne commented

2021-09-03 15:24:54 +02:00

Would have been nice to get updated files here... those are antique (not even collections in them), AND using proxies, which are in low-maintenance mode now...

On a side note, please name properly files in bug reports, simple names like main.blemd will collide very easily with other files from other reports, making it harder and more confusing to deal with.

relocate_library_linking_overrides_main_working.blend

relocate_library_linking_overrides_main.blend

relocate_library_linking_overrides_lib_b.blend

Now, there is no bug here, posebones from the object side are synced with the actual bone from the obdata Armature ID. Since the placeholder one generated for that Armature obdata is empty when the library gets missing, there is no bones, so posebone data (including their constraints) are lost.

With overrides, in case you do override also the Armature obdata itself, things survive since we currently write the full armature data of an override (unlike what we do with meshes e.g.). See relocate_library_linking_overrides_main_working.blend file above.

So no bug here, this is expected behavior thanks to how armatures are dealt with in Blender currently.

Would have been nice to get updated files here... those are antique (not even collections in them), AND using proxies, which are in low-maintenance mode now... On a side note, please name properly files in bug reports, simple names like `main.blemd` will collide very easily with other files from other reports, making it harder and more confusing to deal with. [relocate_library_linking_overrides_main_working.blend](https://archive.blender.org/developer/F10374411/relocate_library_linking_overrides_main_working.blend) [relocate_library_linking_overrides_main.blend](https://archive.blender.org/developer/F10374412/relocate_library_linking_overrides_main.blend) [relocate_library_linking_overrides_lib_b.blend](https://archive.blender.org/developer/F10374413/relocate_library_linking_overrides_lib_b.blend) --------------------------- Now, there is no bug here, posebones from the object side are synced with the actual bone from the obdata Armature ID. Since the placeholder one generated for that Armature obdata is empty when the library gets missing, there is no bones, so posebone data (including their constraints) are lost. With overrides, in case you do override also the Armature obdata itself, things survive since we currently write the full armature data of an override (unlike what we do with meshes e.g.). See `relocate_library_linking_overrides_main_working.blend` file above. So no bug here, this is expected behavior thanks to how armatures are dealt with in Blender currently.

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Bone constraint missing after relocating/remapping missing library #90924