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I’m working with Blender and have a particular workflow where I want to make sure that newly created objects are NOT automatically added to a certain target collection, even when that collection is currently selected or active in the Outliner.

Context: We are creating collection and adding objects to it as part of our add-on code. When the add-on is deactivated, the collection and objects are destroyed as per design. When user activates the add-on and if selects the created collection and adds objects they get added to this collection. We want this to be preventable, even if user has selected the collection inadvertently.

I understand that Blender by default adds new objects to the active collection, but I want to:

  • Keep that target collection selected or active (for other reasons),
  • But prevent new objects from being linked to it automatically.

Is there a way to "lock" or "protect" a collection from receiving new objects? Or any workflow, setting, or scripting solution that prevents this? I’m open to Python scripting solutions, UI tricks, or addon recommendations.

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  • $\begingroup$ By default, we are adding few objects in that collection however it's not required collection to be selected/active if we are able select objects of that collection in viewport. $\endgroup$ Commented Sep 3 at 6:36
  • $\begingroup$ We have requirement that only certain objects only added to specific collection and those we are adding on activating our add-on $\endgroup$ Commented Sep 3 at 6:37
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    $\begingroup$ for sure this can be solved with an add-on - but i am also pretty sure you won't find it because i think this is a very very rare use case. So maybe it would be better to ask on blenderartists.org under paid jobs and open there a topic. $\endgroup$ Commented Sep 3 at 7:24
  • $\begingroup$ No collection has to be selected nor active for objects in it to be selectable in the 3-D Viewport. The collection just has to be unhidden, which they always are by default. $\endgroup$ Commented Sep 3 at 15:10
  • $\begingroup$ We are creating collection and adding objects to it as part of our add-on code. When the add-on is deactivated, the collection and objects are destroyed as per design. When user activates the add-on and if selects the created collection and adds objects they get added to this collection. We want this to be preventable, even if user has selected the collection inadvertently. $\endgroup$ Commented Sep 5 at 5:37

1 Answer 1

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It's quite easy to do:

  1. Create object
  2. Unlink object from the active collection*

*in Blender there is always an active collection: either user one or 'Scene Collection'

HERE:

import bpy
add_object = bpy.ops.mesh.primitive_cube_add

add_object()
context = bpy.context
ob = context.object
collection = context.collection
context.collection.objects.unlink(ob)

Note! When object is not presented in any collection - it is not visible on scene: to make it visible - link the object to collection of your choice (to custom one or to 'Scene Collection')

collection.objects.link(ob)
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