Rigid Body Constraints break when copying its empty object #78953

New Issue

RedMser · 2020-07-15T17:25:44+02:00

RedMser commented

2020-07-15 17:25:44 +02:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce RTX 2080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 446.14

Blender Version
Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-07-08 20:30, hash: 31bc76ea4e

Short description of error
Copying a rigid body constraint via CTRL+C / CTRL+V breaks it permanently (you have to remove and re-add the constraint to make it work again).

Exact steps for others to reproduce the error

Create a simple rigid body constraint setup. You can use this file to start: bug_rigidbodyconstraints_copy.blend
Select all objects
CTRL+C to copy
CTRL+V to paste
Move the new objects a bit to avoid clipping, and play the animation - the active object just falls down
Fixed by removing and manually re-creating the constraint on the Empty.001 object

This does not happen when using SHIFT+D to duplicate.

Seems like the dependency graph loses the connections between the constraint and the rigid body objects after copying.

Working (before copy):

Broken (after copy):

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce RTX 2080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 446.14 **Blender Version** Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-07-08 20:30, hash: `31bc76ea4e` **Short description of error** Copying a rigid body constraint via CTRL+C / CTRL+V breaks it permanently (you have to remove and re-add the constraint to make it work again). **Exact steps for others to reproduce the error** - Create a simple rigid body constraint setup. You can use this file to start: [bug_rigidbodyconstraints_copy.blend](https://archive.blender.org/developer/F8697301/bug_rigidbodyconstraints_copy.blend) - Select all objects - CTRL+C to copy - CTRL+V to paste - Move the new objects a bit to avoid clipping, and play the animation - the active object just falls down - Fixed by removing and manually re-creating the constraint on the Empty.001 object This does not happen when using SHIFT+D to duplicate. --- Seems like the dependency graph loses the connections between the constraint and the rigid body objects after copying. Working (before copy): ![bug_rigidbodyconstraints.svg](https://archive.blender.org/developer/F8697334/bug_rigidbodyconstraints.svg) Broken (after copy): ![bug_rigidbodyconstraints_copy.svg](https://archive.blender.org/developer/F8697335/bug_rigidbodyconstraints_copy.svg)

RedMser commented

2020-07-15 17:25:44 +02:00

Added subscriber: @RedMser

RedMser changed title from ~~Rigid Body Constraints can not be copied (only duplicated)~~ to Rigid Body Constraints break when copying its empty object

2020-07-15 17:26:24 +02:00

Richard Antalik commented

2020-07-16 00:50:42 +02:00

Changed status from 'Needs Triage' to: 'Confirmed'

RedMser commented

2020-07-23 01:23:00 +02:00

I figured out that this is caused by the empty not correctly being added back to the RigidBodyConstraints collection.

A similar bug I found which is related to this (please let me know if I should open a new issue for it):

When appending the objects from the example blend file, the RigidBodyConstraints collection is not created at all, breaking the constraints until manually fixed.

I figured out that this is caused by the empty not correctly being added back to the `RigidBodyConstraints` collection. ![image.png](https://archive.blender.org/developer/F8714644/image.png) A similar bug I found which is related to this (please let me know if I should open a new issue for it): When *appending* the objects from the example blend file, the `RigidBodyConstraints` collection is not created at all, breaking the constraints until manually fixed.

Bastien Montagne commented

2020-08-03 17:27:09 +02:00

Added subscriber: @mont29

Bastien Montagne commented

2020-08-03 17:27:09 +02:00

Would consider this a known issue for now, this is probably rather tricky to solve...

Indeed copy internally uses append mechanism, so both issues are actually the same.

Would consider this a known issue for now, this is probably rather tricky to solve... Indeed copy internally uses append mechanism, so both issues are actually the same.

Philipp Oeser removed the

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Rigid Body Constraints break when copying its empty object #78953