Parent-Child Menu behaves weird #41950

New Issue

Sebastian Koenig · 2014-09-25T12:33:29+02:00

Sebastian Koenig commented

2014-09-25 12:33:29 +02:00

System Information
OSX 10.9.5, GTX 660ti

Blender Version
Broken: 2.72 RC
Worked: pretty sure this is broken forever, i remember seeing weird behavior here before

Short description of error
Assigning object B as parent to an object A via the parent field in object relations panel in properties editor behaves differently depending on if object A has been a child before or not. For a user it is totally unclear what happens.

Exact steps for others to reproduce the error
Open the attached file parent_child_bug.blend
Use the eyedropper tool or the text field to assign the object "parent" as parent to "ex-child" via the relations panel on the right side of the screen. The object stays in place.
Do the same with the object "new_child" and see how it uses the scale factors of the parent.
The only difference between the 2 objects is that i had parented "ex_child" to "parent" before through ctrl+p and cleared the parent after that by pressing the X in the parent selection field in the relations panel.

**System Information** OSX 10.9.5, GTX 660ti **Blender Version** Broken: 2.72 RC Worked: pretty sure this is broken forever, i remember seeing weird behavior here before **Short description of error** Assigning object B as parent to an object A via the parent field in object relations panel in properties editor behaves differently depending on if object A has been a child before or not. For a user it is totally unclear what happens. **Exact steps for others to reproduce the error** Open the attached file [parent_child_bug.blend](https://archive.blender.org/developer/F112336/parent_child_bug.blend) Use the eyedropper tool or the text field to assign the object "parent" as parent to "ex-child" via the relations panel on the right side of the screen. The object stays in place. Do the same with the object "new_child" and see how it uses the scale factors of the parent. The only difference between the 2 objects is that i had parented "ex_child" to "parent" before through ctrl+p and cleared the parent after that by pressing the X in the parent selection field in the relations panel.

Sebastian Koenig commented

2014-09-25 12:33:29 +02:00

Changed status to: 'Open'

Campbell Barton was assigned by Sebastian Koenig

2014-09-25 12:33:29 +02:00

Sebastian Koenig commented

2014-09-25 12:33:29 +02:00

Added subscriber: @sebastian_k

Bastien Montagne commented

2014-09-25 12:57:40 +02:00

Added subscriber: @mont29

Bastien Montagne commented

2014-09-25 12:57:40 +02:00

When you parent with ctrl-P, you are calling an operator which performs additional computation (namely, setting the inverse parent matrix), which allows child to keep its current transform. When you use the ID selector, you only affect the 'parent' property of the object, without touching any other data, like its inverse parent matrix…

No bug here, but agree from user POV this is not much understandable, so maybe we should make this field non-editable… But then, would not be much useful either. :/

When you parent with ctrl-P, you are calling an operator which performs additional computation (namely, setting the inverse parent matrix), which allows child to keep its current transform. When you use the ID selector, you only affect the 'parent' property of the object, without touching any other data, like its inverse parent matrix… No bug here, but agree from user POV this is not much understandable, so maybe we should make this field non-editable… But then, would not be much useful either. :/

Sebastian Koenig commented

2014-09-25 13:02:55 +02:00

Thanks for explaining.
I was suspecting something like that, but maybe this could be somehow exposed to the user? With some has-inverse-matrix info thingy or so? Because as it is now it's really totally obscure...
Maybe add to design to-dos and close this.

Thanks for explaining. I was suspecting something like that, but maybe this could be somehow exposed to the user? With some has-inverse-matrix info thingy or so? Because as it is now it's really totally obscure... Maybe add to design to-dos and close this.

blender-admin commented

2014-10-10 18:45:11 +02:00

This issue was referenced by b100bdca25

This issue was referenced by b100bdca25b15df16c1cd3261f8151b824eb8b19

Campbell Barton was unassigned by Bastien Montagne

2014-10-10 18:47:14 +02:00

Bastien Montagne self-assigned this 2014-10-10 18:47:14 +02:00

Bastien Montagne commented

2014-10-10 18:47:14 +02:00

Added subscriber: @ideasman42