Unlinking RigidBodyWorld Collection Objects via Script #110906

New Issue

Kevin C. Burke · 2023-08-07T22:34:32+02:00

Kevin C. Burke commented

2023-08-07 22:34:32 +02:00

System Information
Operating system: Windows-10-10.0.22621-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 536.67

Blender Version
Broken: version: 3.6.1, branch: blender-v3.6-release, commit date: 2023-07-17 12:50, hash: 8bda729ef4dc

Short description of error
When unlinked from RigidBodyWorld before removing the object rigid body settings, the objects are linked to the Main Scene Collection.

This was detected when trying this code:

import bpy

scene = bpy.context.scene
enable = True # set to True to link to Rigid Body collection, set False to unlink

if not scene.rigidbody_world: # a RigidBodyWorld collection doesn't exist
    bpy.ops.rigidbody.world_add() # run Add Rigid Body World operator
    scene.rigidbody_world.collection = bpy.context.active_object.users_collection[0] # use the active object's collection for rigid bodies

for o in bpy.context.selected_objects: # get selected objects
    rb_coll = scene.rigidbody_world.collection.objects # get the rigid body world's objects
    if o.type == "MESH": # for mesh objects
        if enable and o not in list(rb_coll):
            rb_coll.link(o) # link object to rigid body world collection
        elif not enable and o in list(rb_coll): 
            rb_coll.unlink(o) # unlink object to rigid body world collection

Exact steps for others to reproduce the error

Open attached .blend file
Run script to unlink objects
For each Cube object, remove the rigid body settings

Objects are linked to the Main Collection

**System Information** Operating system: Windows-10-10.0.22621-SP0 64 Bits Graphics card: NVIDIA GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 536.67 **Blender Version** Broken: version: 3.6.1, branch: blender-v3.6-release, commit date: 2023-07-17 12:50, hash: `8bda729ef4dc` **Short description of error** When unlinked from `RigidBodyWorld` before removing the object rigid body settings, the objects are linked to the Main Scene Collection. <video src="/attachments/ce28e0d4-e1c8-4bef-a423-99f5b7b9e225" title="Unlinking Rigid Body objects.mp4" controls></video> This was detected when trying this code: ```python import bpy scene = bpy.context.scene enable = True # set to True to link to Rigid Body collection, set False to unlink if not scene.rigidbody_world: # a RigidBodyWorld collection doesn't exist bpy.ops.rigidbody.world_add() # run Add Rigid Body World operator scene.rigidbody_world.collection = bpy.context.active_object.users_collection[0] # use the active object's collection for rigid bodies for o in bpy.context.selected_objects: # get selected objects rb_coll = scene.rigidbody_world.collection.objects # get the rigid body world's objects if o.type == "MESH": # for mesh objects if enable and o not in list(rb_coll): rb_coll.link(o) # link object to rigid body world collection elif not enable and o in list(rb_coll): rb_coll.unlink(o) # unlink object to rigid body world collection ``` **Exact steps for others to reproduce the error** - Open attached .blend file - Run script to unlink objects - For each Cube object, remove the rigid body settings Objects are linked to the Main Collection

rigid_body_removal__bug.blend

914 KiB

Unlinking Rigid Body objects.mp4

13 MiB

Kevin C. Burke added the

labels 2023-08-07 22:34:33 +02:00

Germano Cavalcante commented

2023-08-08 00:01:25 +02:00

From what I saw in the video, the objects are not duplicated.
The same object can be in more than one collection.
This is normal.

But it's strange that the object remains in the Rigid Body collection even after the Rigid Body settings are removed.

However I tried to replicate the problem using this .blend file and was unsuccessful. There must be something wrong with the file shown.

From what I saw in the video, the objects are not duplicated. The same object can be in more than one collection. This is normal. But it's strange that the object remains in the Rigid Body collection even after the Rigid Body settings are removed. However I tried to replicate the problem using this .blend file and was unsuccessful. There must be something wrong with the file shown.

rigid_body_removal__.blend

902 KiB

Germano Cavalcante added

Status

Needs Information from User

and removed

Status

Needs Triage

labels 2023-08-08 00:01:37 +02:00

Kevin C. Burke commented

2023-08-08 01:16:50 +02:00

Hi @mano-wii , thank you for the reply.

In the attached screen capture, I am using your file and adding 'Rigid Body' to the Active Object. This creates the collection 'RigidBodyWorld'. I then run the script to add the other selected objects to the 'RigidBodyWorld' collection. When I then use the script to unlink the objects, it's just as you said: the objects aren't removed from the Rigid Body collection.

Hi @mano-wii , thank you for the reply. In the attached screen capture, I am using your file and adding 'Rigid Body' to the Active Object. This creates the collection 'RigidBodyWorld'. I then run the script to add the other selected objects to the 'RigidBodyWorld' collection. When I then use the script to unlink the objects, it's just as you said: the objects aren't removed from the Rigid Body collection.

Unlinking 2.mp4

9.5 MiB

YimingWu commented

2023-08-08 05:01:05 +02:00

Hi @KevinCBurke Apparently it should be elif (not enable) and (o in list(rb_coll)):, otherwise the logic won't pass. And if changed to this, here it unlinks successfully.

Hi @KevinCBurke Apparently it should be `elif (not enable) and (o in list(rb_coll)):`, otherwise the logic won't pass. And if changed to this, here it unlinks successfully.

YimingWu added the

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Unlinking RigidBodyWorld Collection Objects via Script #110906