Volumes stop casting shadows inside geometry when their layer visibility is off #48512

Closed
opened 2016-05-25 12:56:40 +02:00 by Konstantins Visnevskis · 8 comments

System Information
Win8.1, 3x gtx580, Ubuntu14, IntelGMA

Blender Version
2.77a

Short description of error
It does say in manual that "Currently we do not support: Correct ray visibility for volume meshes", but I'm not confident what that means so to be sure:

When volume mesh is intersecting another mesh it casts shadows properly, but if volume's layer gets hidden from render, the inside volume shadows disappear.

Exact steps for others to reproduce the error
Open file, press render -> no shadow inside the box.
volume.blend

**System Information** Win8.1, 3x gtx580, Ubuntu14, IntelGMA **Blender Version** 2.77a **Short description of error** It does say in manual that "Currently we do not support: Correct ray visibility for volume meshes", but I'm not confident what that means so to be sure: When volume mesh is intersecting another mesh it casts shadows properly, but if volume's layer gets hidden from render, the inside volume shadows disappear. **Exact steps for others to reproduce the error** Open file, press render -> no shadow inside the box. [volume.blend](https://archive.blender.org/developer/F314613/volume.blend)

Changed status to: 'Open'

Changed status to: 'Open'

Added subscriber: @KonstantinsVisnevskis

Added subscriber: @KonstantinsVisnevskis

#48513 was marked as duplicate of this issue

#48513 was marked as duplicate of this issue

Added subscriber: @brecht

Added subscriber: @brecht

Merged in the other report since it's another manifestation of the same issue. When the volume has camera ray visibility off or is on a hidden layer (same thing to Cycles), the volume stack gets confused.

Not sure if we consider that a bug or a to do item at this point.

Merged in the other report since it's another manifestation of the same issue. When the volume has camera ray visibility off or is on a hidden layer (same thing to Cycles), the volume stack gets confused. Not sure if we consider that a bug or a to do item at this point.

Added subscriber: @Sergey

Added subscriber: @Sergey

Changed status from 'Open' to: 'Archived'

Changed status from 'Open' to: 'Archived'
Sergey Sharybin self-assigned this 2016-06-08 15:03:52 +02:00

Wouldn't consider this a bug. Supporting this will be quite tricky: in order to fully support this tricks to work we'll either need to scarify visibility checks in BVH traversal (which is undesirable) or re-initialize volume stack after every bounce (which is also not optimal).

Mentioned this in the TODO page: https://wiki.blender.org/index.php/Dev:Source/Render/Cycles/ToDo

Thanks for the report anyway.

Wouldn't consider this a bug. Supporting this will be quite tricky: in order to fully support this tricks to work we'll either need to scarify visibility checks in BVH traversal (which is undesirable) or re-initialize volume stack after every bounce (which is also not optimal). Mentioned this in the TODO page: https://wiki.blender.org/index.php/Dev:Source/Render/Cycles/ToDo Thanks for the report anyway.
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Reference: blender/blender#48512
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