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Missing volumetric shadows for instanced collections
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Description

System Information
Operating system: Windows-10-10.0.17763 64 Bits
Graphics card: GeForce GTX 960M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 418.81

Blender Version
Broken: version: 2.80 (sub 48), branch: master, commit date: 2019-03-13 12:50, hash: rBffa29194bbe7

Short description of error
Volumetric shadows are missing if the objects that are supposed to project a shadow are in a collection and that collection is instanced. Volumetric shadows aren't missing for the original collection.

Exact steps for others to reproduce the error

  1. Setup a collection with a volumetric shadow;
  2. Instantiate the collection;
  3. Hide the original collection;

Details

Type
Bug

Event Timeline

Sebastian Parborg (zeddb) triaged this task as Confirmed, Medium priority.

@Bastien Montagne (mont29) I'm unsure is this is for you or not, so feel free to reassign if needed.

That sounds a lot like a drawing issue, maybe with some depsgraph aspects? Definitively not for me, @Clément Foucault (fclem) I think you are the first that should have a look at that?

It is not the objects not casting shadows, it is the lights.
Everything is fine here if the light is not part of the instance collection, the objects in an instance collection are working fine...

Eevee lights not casting shadows if they are in an instance collection is a known issue/limitation and has been reported in T57693, will merge this report in...