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"Shadow" collections not visible in the outliner
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System Information
Operating system: Linux-4.19.30_1-x86_64-with-glibc2.9 64 Bits
Graphics card: TITAN X (Pascal)/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 418.43

Blender Version
Broken: version: 2.80 (sub 51), branch: master, commit date: 2019-03-26 18:57, hash: rB337eb8c1de4c
Worked: -

Short description of error
When using the old grouping shortcut (CTRL + G) on a few objects to create a collection with them in it, the collection is not visible in the Outliner, only in the Object Properties window.
The same thing happens when appending a particle system emitter and its instances that are in a collection. While the particle system works, the collection of instances only show that they're in a collection in the object properties, not in the outliner.
Ideally, any imported collections should also show up in the outliner.

Exact steps for others to reproduce the error

Method 01

  • Create object
  • Hit CTRL+G to add it to a collection
  • Collection invisible in outliner

Method 02

  • Create object with particle system
  • Create set of particle instances
  • Add particle instances to collection and set particles to render "Collection"
  • Save file
  • Append particle emitter and instances to new file
  • Instance collection does not show up in outliner, only object properties

Event Timeline

They show up in the Outliner in "Blender File" mode under collections (and can be linked to the scene from there)
Moving (exclusive) to a new collection can be done with M (this new collection will be linked to the scene automatically)

I think this has been discussed before [whether Ctrl+G should link the collection to the scene] and I think there were reasons against it?, subscribing @William Reynish (billreynish) here...

I think currently the idea is that the M-key feature is meant to add collections to the scene, whereas Ctrl-G continues to work like Groups did in 2.79 - ie not adding collections into the scene.

It could change but currently that’s how it’s supposed to be afaik.

Brecht Van Lommel (brecht) changed the task status from Unknown Status to Unknown Status.EditedMar 28 2019, 2:36 PM
Brecht Van Lommel (brecht) claimed this task.

We can and plan to improve the design here further, but I don't think there's a bug here.