When using "Append" rigid body objects + empty constraint, none of its constraints work. #86379

New Issue

anger · 2021-03-08T07:37:17+01:00

anger commented

2021-03-08 07:37:17 +01:00

System Information
Operating system: windows 10
Graphics card: gtx 1070

Blender Version
Broken: 2.92 release
Worked: Don't test old Blender

Short description of error : When using "Append" rigid body objects + empty constraint in a .blend that already has rigid body objects , none of its constraints work.

Create a .blend with 2 rigid body objects in a collection with a constraint empty. Create another blend with 2 rigid body objects with a constraint empty. Append the collection of the first .blend in the second one. The constraint doesn't work anymore.

Let us look in the properties of the object to which collection it belongs. the append object mesh objects are well in the collection "RigidBodyWorld". On the other hand the append empty is no longer in the "RigidBodyConstraints" collection.
This means that no more constraints of an append rigid body object in another blend will work cause they are not recognized.

**System Information** Operating system: windows 10 Graphics card: gtx 1070 **Blender Version** Broken: 2.92 release Worked: Don't test old Blender Short description of error : When using "Append" rigid body objects + empty constraint in a .blend that already has rigid body objects , none of its constraints work. Create a .blend with 2 rigid body objects in a collection with a constraint empty. Create another blend with 2 rigid body objects with a constraint empty. Append the collection of the first .blend in the second one. The constraint doesn't work anymore. Let us look in the properties of the object to which collection it belongs. the append object mesh objects are well in the collection "RigidBodyWorld". On the other hand the append empty is no longer in the "RigidBodyConstraints" collection. This means that no more constraints of an append rigid body object in another blend will work cause they are not recognized.

anger commented

2021-03-08 07:37:17 +01:00

Added subscriber: @jemian

Philipp Oeser commented

2021-03-08 11:38:36 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2021-03-08 11:38:36 +01:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Philipp Oeser commented

2021-03-08 11:38:36 +01:00

Could you attach both source .blend files?
(I know this does not take super-long to set up, but it ensures we are all on the same page and it might be multiple devs looking at this, so time adds up...)
Thx in advance!

Could you attach both source .blend files? (I know this does not take super-long to set up, but it ensures we are all on the same page and it might be multiple devs looking at this, so time adds up...) Thx in advance!

anger commented

2021-03-09 01:15:56 +01:00

Ok! "Append" collections from one .blend into the other. The constraints of the "append" objects are broken even when importing the constraintObjectWorld collection.
rigid.anim1.blend

rigid.anims2.blend

Ok! "Append" collections from one .blend into the other. The constraints of the "append" objects are broken even when importing the constraintObjectWorld collection. [rigid.anim1.blend](https://archive.blender.org/developer/F9880189/rigid.anim1.blend) [rigid.anims2.blend](https://archive.blender.org/developer/F9880190/rigid.anims2.blend)

anger commented

2021-03-09 17:23:24 +01:00

Well apparently this is a limitation of the "Append". It's very, very annoying because you can't do a scene with actors in rigid bodies without redoing all the constraint settings at each shot. For example a car simulation is impossible.