Adding a constraint to a bone of a proxy armature resets all bones' transformations. #43872

New Issue

Cenek Strichel · 2015-03-03T18:48:40+01:00

Cenek Strichel commented

2015-03-03 18:48:40 +01:00

System Information
W8.1 64b, GF 250

Blender Version
Blender 2.73a

Exact steps for others to reproduce the error

ref.blend
scene.blend

Download my files and open Scene.blend
Link circled bone to Cylinder with Contraint Child of
Linked bones are reseted until you play animation
Bones are reseted everytime you set something in added constraint

Maybe it is limitation, it is not serious, keyframe are ok, but it reset all if you dont have keyframe.

**System Information** W8.1 64b, GF 250 **Blender Version** Blender 2.73a **Exact steps for others to reproduce the error** [ref.blend](https://archive.blender.org/developer/F147056/ref.blend) [scene.blend](https://archive.blender.org/developer/F147057/scene.blend) 1) Download my files and open Scene.blend 2) Link circled bone to Cylinder with Contraint Child of 3) Linked bones are reseted until you play animation 4) Bones are reseted everytime you set something in added constraint Maybe it is limitation, it is not serious, keyframe are ok, but it reset all if you dont have keyframe.

Cenek Strichel commented

2015-03-03 18:48:40 +01:00

Changed status to: 'Open'

Cenek Strichel commented

2015-03-03 18:48:40 +01:00

Added subscriber: @Cenda

Bastien Montagne changed title from ~~Constrain is reseting linked position~~ to Adding a constraint to a bone of a proxy armature resets all bones' transformations.

2015-03-06 10:37:27 +01:00

Bastien Montagne commented

2015-03-06 10:38:58 +01:00

Added subscribers: @JoshuaLeung, @ideasman42, @Sergey, @mont29

Bastien Montagne commented

2015-03-06 10:38:58 +01:00

Issue here is adding a constraint to a bone of a proxy armature (any constraint does the same).

Not even sure this should be allowed?

Issue here is adding a constraint to a bone of a proxy armature (any constraint does the same). Not even sure this should be allowed?

Bastien Montagne commented

2015-03-06 10:43:33 +01:00

OK, so in your ref.blend file, all bones of the armature are in a protected layer. This implies you should not be able to edit them (like adding a constraint).

Bastien Montagne commented

2015-03-06 10:49:41 +01:00

Grmlll… And yet, code explicitly allows adding constraints to locked bones… Have to dig this more.

Joshua Leung commented

2015-03-06 10:50:59 +01:00

@mont29: I think animators would beg to differ - Being able to do that is pretty much essential to being able to add constraints for grabbing/hanging on to props.

Bastien Montagne commented

2015-03-06 11:50:21 +01:00

@JoshuaLeung yep, realize that.

In fact, I think it boils down to an update issue (i.e., the fact that transformation is reset is expected behavior, but animation should be immediately re-evaluated then):

Adding a constraint forces re-evaluation of the whole pose.
For proxy bones on locked layers, this means reloading transformations from library (in BKE_pose_rebuild()).

What I do not know is how to force re-evaluation of animation afterwards - I tried to tag update OB_RECALC_ALL (which includes time) in this case, but no luck so far. :/

@JoshuaLeung yep, realize that. In fact, I think it boils down to an update issue (i.e., the fact that transformation is reset is expected behavior, but animation should be immediately re-evaluated then): * Adding a constraint forces re-evaluation of the whole pose. * For proxy bones on locked layers, this means reloading transformations from library (in `BKE_pose_rebuild()`). What I do not know is how to force re-evaluation of animation afterwards - I tried to tag update `OB_RECALC_ALL` (which includes time) in this case, but no luck so far. :/

Joshua Leung commented

2015-03-06 11:57:04 +01:00

If you only want to force animation refresh, you can simply tag the relevant animdata->recalc with ADT_RECALC_ANIM and it will do that

Bastien Montagne self-assigned this 2015-03-06 12:47:43 +01:00

Cenek Strichel commented

2015-03-06 16:01:11 +01:00

I also found in manual that I can not add constraint to Protected Layer, so I was surprised that I can :) But it is good for props. Also it will be fine if my pose will not reseted after added constraint, if I dont have keyframe yet.

Bastien Montagne commented

2015-03-07 09:21:04 +01:00

@Cenda: you should always key your transforms on locked proxy bones, many things in Blender will reset them to lib position otherwise (like undo/redo, etc.). This is not a bug, if you want complete freedom for your proxy bones then place them on a non-locked bone layer in your lib file.

blender-admin commented

2015-03-09 13:02:30 +01:00

This issue was referenced by b21e0cccfa

This issue was referenced by b21e0cccfa29ab87c0f78a4c5ff05827a3efee7f

Bastien Montagne commented

2015-03-09 13:02:57 +01:00

Changed status from 'Open' to: 'Resolved'

Bastien Montagne closed this issue

2015-03-09 13:02:57 +01:00

Bastien Montagne commented

2015-03-09 13:02:57 +01:00

Closed by commit b21e0cccfa.

Closed by commit b21e0cccfa.

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Adding a constraint to a bone of a proxy armature resets all bones' transformations. #43872