Animation: Child Of constraint does not clear inversion if Target was deleted #116567

New Issue

Matthew-Frey · 2023-12-27T01:22:52+01:00

Matthew-Frey commented

2023-12-27 01:22:52 +01:00

System Information
Operating system: Windows-10-10.0.19045-SP0 64 Bits
Graphics card: Intel(R) HD Graphics 2500 Intel 4.0.0 - Build 10.18.10.4425

Blender Version
Broken: version: 3.4.1, branch: blender-v3.4-release, commit date: 2022-12-19 17:00, hash: rB55485cb379f7
Worked: (newest version of Blender that worked as expected)

My friend checked Blender version 3.6.5, and it was still there.

Short description of error
When I do a few steps with a rig then I try to move it, it wont move.

Exact steps for others to reproduce the error
I have a full rig.
I want to separate the foot, or any part of the rig.
So I reset pose. (in pose mode not in the armature properties)
Clear parent to all parts.
Select the bones I want to separate, then I separate them.
I then delete the rest of the rig that's left. (as an object, not in edit mode)
Then I want to move it, and it doesn't move. Nor can I rotate or scale.

I do know why this happens, it is because I have a Child Of on the bone that move the entire foot. But shouldn't it still detect that the bone that it was on know that it's gone? But if I delete the bones in edit mode that I don't want (instead of separate it then delete it as an object) then the Child Of will not work so then I can move/rotate/scale it.

The blender below has an example of what it looks like.

**System Information** Operating system: Windows-10-10.0.19045-SP0 64 Bits Graphics card: Intel(R) HD Graphics 2500 Intel 4.0.0 - Build 10.18.10.4425 **Blender Version** Broken: version: 3.4.1, branch: blender-v3.4-release, commit date: 2022-12-19 17:00, hash: `rB55485cb379f7` Worked: (newest version of Blender that worked as expected) My friend checked Blender version 3.6.5, and it was still there. **Short description of error** When I do a few steps with a rig then I try to move it, it wont move. **Exact steps for others to reproduce the error** I have a full rig. I want to separate the foot, or any part of the rig. So I reset pose. (in pose mode not in the armature properties) Clear parent to all parts. Select the bones I want to separate, then I separate them. I then delete the rest of the rig that's left. (as an object, not in edit mode) Then I want to move it, and it doesn't move. Nor can I rotate or scale. I do know why this happens, it is because I have a Child Of on the bone that move the entire foot. But shouldn't it still detect that the bone that it was on know that it's gone? But if I delete the bones in edit mode that I don't want (instead of separate it then delete it as an object) then the Child Of will not work so then I can move/rotate/scale it. The blender below has an example of what it looks like.

A Blender Bug.blend

864 KiB

👍 1

Matthew-Frey added the

labels 2023-12-27 01:22:53 +01:00

Iliya Katushenock changed title from ~~Weird with separating rig, or whatever.~~ to Animation: Child Of constraint does not clear inversion if Target was deleted

2023-12-27 09:09:07 +01:00

Iliya Katushenock added

and removed

labels 2023-12-27 09:09:16 +01:00

Iliya Katushenock commented

2023-12-27 09:12:35 +01:00

Thanks for report, i can confirm issue.
If you select any object for Target field in Child Of constraint, bones with this constrain will be locked for Inversion.
And if you delete object (selected in Target field) now, constraint will keep be locked until you change anything in it settings.

Thanks for report, i can confirm issue. If you select any object for `Target` field in `Child Of` constraint, bones with this constrain will be locked for `Inversion`. And if you delete object (selected in `Target` field) now, constraint will keep be locked until you change anything in it settings.

Matthew-Frey commented

2023-12-27 22:26:29 +01:00

Yes, but I think it should automatically disable the modifier because that bone/object isn't there anymore, it was just a way that I did it. I don't think we would need to go to the modifier and turn off, or turn off then on, set inverse, or clear parent to make it disabled.

Nathan Vegdahl commented

2024-01-12 11:18:20 +01:00

Minimal repro: 116567_minimal_repro.blend

Steps to repro with this file:

Delete the cube.
Try to move the armature object, and notice that the bone doesn't move with it.
Disable and re-enable the Child Of constraint on the bone.
Try to move the armature object again, and notice that now it works as expected.

From just testing, it does seem like Child Of constraints on bones don't get invalidated properly when their target is deleted. Note that the same issue does not show up for Child Of constraints on objects, which get properly invalidated.

Minimal repro: [116567_minimal_repro.blend](/attachments/a527a499-3f58-4981-8ce8-3596bded7ff0) Steps to repro with this file: 1. Delete the cube. 2. Try to move the armature *object*, and notice that the bone doesn't move with it. 3. Disable and re-enable the Child Of constraint on the bone. 4. Try to move the armature object again, and notice that now it works as expected. From just testing, it does seem like Child Of constraints on bones don't get invalidated properly when their target is deleted. Note that the same issue does *not* show up for Child Of constraints on objects, which get properly invalidated.

116567_minimal_repro.blend

842 KiB

Nathan Vegdahl self-assigned this 2024-01-15 12:30:51 +01:00

Matthew-Frey closed this issue

2024-02-21 23:13:04 +01:00

Blender Bot added

and removed

labels 2024-02-21 23:13:05 +01:00

Nathan Vegdahl commented

2024-02-22 10:42:29 +01:00

@Matthew-Frey Was this fixed? If so, please link to the relevant PR or commit when closing.

Nathan Vegdahl reopened this issue

2024-02-22 10:42:32 +01:00

Blender Bot added

and removed

labels 2024-02-22 10:42:35 +01:00

Nathan Vegdahl added

and removed

labels 2024-02-22 10:42:49 +01:00

Matthew-Frey commented

2024-02-24 00:34:05 +01:00

Sorry, didn't know I needed to state that before closing, new to this.

But the issue is still here, at least to my knowledge because I cannot download 4.0+ to test if they updated it, nor can I open the linked file above on a previous comment, because my CPU is bad, it cannot handle material preview.

I mean as long as you don't do my way, which is separate the bones in edit mode then delete the other armature in object mode, then you should be fine, and it is an easy fix to be able to move it.

Sorry, didn't know I needed to state that before closing, new to this. But the issue is still here, at least to my knowledge because I cannot download 4.0+ to test if they updated it, nor can I open the linked file above on a previous comment, because my CPU is bad, it cannot handle material preview. I mean as long as you don't do my way, which is separate the bones in edit mode then delete the other armature in object mode, then you should be fine, and it is an easy fix to be able to move it.

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Animation: Child Of constraint does not clear inversion if Target was deleted #116567