Parenting constrained objects move them #18134

New Issue

Simon Rainerson · 2008-12-30T23:24:26+01:00

Simon Rainerson commented

2008-12-30 23:24:26 +01:00

Category: Logic

%%%If you have an object constrained to an axis then parent the object to a second object the the child will lose it's constraints (which it should) but first it's moved. To where it would be constrained if the parent object where the world origin.

In the example file:
the smaller cube is constrained to the x-axis. When space is pressed the smaller cube is parented to the bigger. The smaller cube is moved to the same x coordinates as the bigger but stays on the other axis.

It should break the constraints and not relocated at all.%%%

**Category**: Logic %%%If you have an object constrained to an axis then parent the object to a second object the the child will lose it's constraints (which it should) but first it's moved. To where it would be constrained if the parent object where the world origin. In the example file: the smaller cube is constrained to the x-axis. When space is pressed the smaller cube is parented to the bigger. The smaller cube is moved to the same x coordinates as the bigger but stays on the other axis. It should break the constraints and not relocated at all.%%%

Simon Rainerson commented

2008-12-30 23:24:26 +01:00

Changed status to: 'Open'

Jorge Bernal commented

2014-05-26 01:49:27 +02:00

Added subscriber: @JorgeBernalMartinez

Jorge Bernal commented

2014-05-26 01:49:27 +02:00

For me the current behaviour is the right one. If you want a behaviour where the constrains are removed i think you can obtain it with a little bit of additional logic as I show you in the blend attached

Benoit Bolsee was unassigned by Inês Almeida

2014-06-11 18:50:42 +02:00

Inês Almeida self-assigned this 2014-06-11 18:50:42 +02:00

Inês Almeida commented

2014-06-11 19:33:52 +02:00

Changed status from 'Open' to: 'Archived'

Inês Almeida closed this issue

2014-06-11 19:33:52 +02:00

Inês Almeida commented

2014-06-11 19:33:52 +02:00

This is the current behaviour:
when an object is parented to another its constraints are kept, but relative to the parent. So in this case, the child object has as constraint +-0 relative to the parent's X.

This is what is happening:
The child is parented, its loc/rot/scale is set relative to the parent, the loc is therefore an offset to the parent.
Then the constraint is run, and it sets the offset on X to 0 because that is its limit.

So this is actually doing what it is supposed to.. but I agree that it is not much intuitive and seeing it 'jump' is unexpected.
I'll close, but add as a ToDo a better constraint interface, where it can be specified the coordinate system of the constraint.

This is the current behaviour: when an object is parented to another its constraints are kept, but relative to the parent. So in this case, the child object has as constraint +-0 relative to the parent's X. This is what is happening: The child is parented, its loc/rot/scale is set relative to the parent, the loc is therefore an offset to the parent. Then the constraint is run, and it sets the offset on X to 0 because that is its limit. So this is actually doing what it is supposed to.. but I agree that it is not much intuitive and seeing it 'jump' is unexpected. I'll close, but add as a ToDo a better constraint interface, where it can be specified the coordinate system of the constraint.

vinay commented

2015-04-09 13:34:06 +02:00

Added subscriber: @vinay_godara

vinay commented

2015-04-09 13:34:06 +02:00

Hey man I know rigid body are unable to use in same case (like in parenting , child object lost its limits, unstable joint in some case ) but i have create an addon which can apply limit to an object in all condition ,
But the problem is that I don't have a wiki page yet to upload my addon , I already send an request email 3 day ago , but did not get yet .

Hey man I know rigid body are unable to use in same case (like in parenting , child object lost its limits, unstable joint in some case ) but i have create an addon which can apply limit to an object in all condition , But the problem is that I don't have a wiki page yet to upload my addon , I already send an request email 3 day ago , but did not get yet .

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Parenting constrained objects move them #18134