Error when applying Camera Shakify to a new camera in a file that already library-links a camera from another file that also has Camera Shakify applied.

[0xCarnival]

Description

When attempting to use the Camera Shakify addon on a newly created camera in a Blender scene, a runtime error occurs if the Blender file contains linked libraries or scenes. The error seems related to the presence of linked collections, even though the new camera and its associated objects are not part of those linked collections.

Error Log

Traceback (most recent call last):
File "/path/to/Library/Application Support/Blender/4.3/extensions/blender_org/camera_shakify/init.py", line 453, in execute
rebuild_camera_shakes(camera, context)
File "/path/to/Library/Application Support/Blender/4.3/extensions/blender_org/camera_shakify/init.py", line 363, in rebuild_camera_shakes
build_single_shake(camera, shake_item_index, collection, context)
File "/path/to/Library/Application Support/Blender/4.3/extensions/blender_org/camera_shakify/init.py", line 174, in build_single_shake
collection.objects.link(shake_object)
RuntimeError: Error: Could not (un)link the object 'CameraShakify.v2_Camera_0' because the collection 'CameraShakify.v2' is linked

Steps to Reproduce

Open a Blender file containing linked libraries or scenes.
Create a new camera in a local scene or collection.
Apply Camera Shakify to the newly created camera.
Observe the error when the addon attempts to rebuild camera shakes.

Expected Behavior

Camera Shakify should function normally for newly created cameras in a local scene, regardless of the presence of linked libraries elsewhere in the Blender file.

Actual Behavior

The addon raises a runtime error when attempting to link objects to a collection that happens to be linked, even though the new camera and its objects are not part of that collection.

Environment

Blender Version: 4.3
Camera Shakify Version: Latest
Operating System: macOS

Additional Notes

This issue seems to arise because the addon uses a linked collection (CameraShakify.v2) by default or inadvertently.
A potential fix could involve ensuring the addon creates or uses a local collection for storing objects related to the new camera shakes. This could include verifying that the target collection is not linked before attempting to link objects.

[cessen]

Thank you for the report!

This is happening specifically because you have a camera in the library-linked data that already has Camera Shakify applied. It doesn't happen with library linking in general.

Indeed, the fix will involve using a more sophisticated naming scheme for the camera shakify collection, as well as for the camera shakify helper objects in that collection.

In the mean time, this should be easy to work around by simply not linking other camera shakify cameras. It's also possible that you've accidentally directly linked in the camera shakify collection from another file, in which case you should also not do that.

[0xCarnival]

Thank you @cessen

It happened that I linked a scene from Project B to Project A that also uses Camera Shakify. When I tried to Shakify a new camera on Project A it gave that error.

It all went to normal as soon as I unlinked those scenes from Project B.

It could be that it also, as you said, it accidentaly linked the Camera Shakify Collection from Project B.

Anyway, thanks for your attention.