Dynamic Particle Hair Failing to be Visible in Optix Device Cycles Render on Linux if Motion Blur Is Enabled #87269
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Reference: blender/blender#87269
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System Information
Operating system: OpenSUSE Leap 15.2
Graphics card: NVIDIA RTX 2070, NVIDIA RTX 3070
NVIDIA Driver: 460.67-lp152.36.1-x86_64 (NVIDIA Proprietary)
CUDA: 11.2, 10.1
Renderer: Optix (only GPU, not CPU)
Blender Version
Broken: 2.92.0, 2.91.0, 2.93.0-24d71acd864b-linux64
Worked: none
Short description of error
In some scenarios, whilst using Optix Render Devices on Linux, some Dynamic Particle Hair systems will fail to render if Motion Blur is enabled in the Render panel. This appears to only happen on Linux, as I can't recreate the issue using the same scene files in Windows 10 (various builds).
Exact steps for others to reproduce the error
I've failed to come up with a tiny reproducible scene that I am able to share (my project is 8.2GB, and includes commercial and personal assets). The complexity of the scene seems to be a condition of this. These seem to be related factors:
Workarounds
debugcycles.txt
This render is the issue. The scalp dynamic hair has failed to render whilst motion blur is enabled. Generating no errors or failures. Note that non-dynamic systems (facial hair, eyebrows) render
This is the same frame, with motion blur disabled. The scalp dynamic hair appears in final render without issue
This is the same frame, with motion blur enabled but object deformation disabled for the scalp. Renders all hair systems without issue.
Apologies again for being unable to provide a sample blend file reproducing this. Happy to provide any further information that may be required.
Added subscriber: @thechode
I've retested this in just released Blender 2.93, and same issue occurring
Added subscriber: @lichtwerk
Changed status from 'Needs Triage' to: 'Needs User Info'
Thx for the report!
Since this only occurs in complex files:
(this just has a higher chance of coming up with a reproducable case compared to devs building up a complex scene until they run into this -- it also makes sure we are all on the same page).
This is embarassing, but I just fired up my scene again in the last tested version of Blender (2.93) and issue is no longer occurring. I can only assume that this was resolved in an NVIDIA driver update along the way (currently have 470.57.02-lp152.43.1-x86_64 installed).
Tested in a couple of different versions of Blender, can no longer recreate. So this appears to be resolved.
Changed status from 'Needs User Info' to: 'Archived'
Oki, glad to hear!