VDB Volume Objects cast incorrect shadows in Cycles #97815

New Issue

Mimouni Zied · 2022-05-03T16:08:36+02:00

Mimouni Zied commented

2022-05-03 16:08:36 +02:00

System Information
Operating system: Windows-10-10.0.19043-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 497.29

Blender Version
Broken: version: 3.3.0 Alpha, branch: master, commit date: 2022-05-02 10:21, hash: e07ac34b3f
Worked: Never

Short description of error
[
The volume casts incorrect shadows that persist even when the density is set to 0
]
Exact steps for others to reproduce the error
[Add a vdb volume, set the shader to principled volume, add a ground plane and a lamp]
[Based on the default startup or an attached .blend file (as simple as possible): blender vdb bug.zip
set the target vdb file to the one provided in the archive and switch to rendered view]

**System Information** Operating system: Windows-10-10.0.19043-SP0 64 Bits Graphics card: NVIDIA GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 497.29 **Blender Version** Broken: version: 3.3.0 Alpha, branch: master, commit date: 2022-05-02 10:21, hash: `e07ac34b3f` Worked: Never **Short description of error** [ The volume casts incorrect shadows that persist even when the density is set to 0 ] **Exact steps for others to reproduce the error** [Add a vdb volume, set the shader to principled volume, add a ground plane and a lamp] [Based on the default startup or an attached .blend file (as simple as possible): [blender vdb bug.zip](https://archive.blender.org/developer/F13049401/blender_vdb_bug.zip) set the target vdb file to the one provided in the archive and switch to rendered view] ![volumetric shadow bug.png](https://archive.blender.org/developer/F13049403/volumetric_shadow_bug.png)

Mimouni Zied commented

2022-05-03 16:08:36 +02:00

Added subscriber: @Mimouni-Zied

Mimouni Zied changed title from ~~VDB Volume Objects casts incorrect shadows in Cycles~~ to VDB Volume Objects cast incorrect shadows in Cycles

2022-05-03 16:13:41 +02:00

Kévin Dietrich commented

2022-05-04 20:58:14 +02:00

Added subscriber: @kevindietrich

Kévin Dietrich commented

2022-05-04 20:58:14 +02:00

As far as I can tell this is the same issue as #97650. Shadow rays intersect lots of faces from the volume mesh, which may exceed the max transparency bounces. As a workaround you can try to increase the maximum number of transparency bounce in Render Properties > Light Path > Max Bounces. (In your file 18 bounces seem to do the trick.)

As far as I can tell this is the same issue as #97650. Shadow rays intersect lots of faces from the volume mesh, which may exceed the max transparency bounces. As a workaround you can try to increase the maximum number of transparency bounce in `Render Properties > Light Path > Max Bounces`. (In your file 18 bounces seem to do the trick.)

Kévin Dietrich commented

2022-05-04 20:58:53 +02:00

Closed as duplicate of #97650

Kévin Dietrich closed this issue

2022-05-04 20:58:53 +02:00

Mimouni Zied commented

2022-05-05 18:00:48 +02:00

I m glad there is an easy fix for it
Thank you very much

I m glad there is an easy fix for it Thank you very much

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VDB Volume Objects cast incorrect shadows in Cycles #97815