Cycles GPU CUDA rendering high number of points seems broken in LTS (main is fine, request for backport) #104163
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Reference: blender/blender#104163
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System Information
Operating system: Linux-5.15.0-58-generic-x86_64-with-glibc2.31 64 Bits
Graphics card: NVIDIA GeForce RTX 3070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 515.86.01
Blender Version
Broken: version: 3.3.3, branch: master, commit date: 2023-01-17 11:50, hash:
09febafb97Worked: latest 3.5 alpha
Short description of error
Rendering point "clouds" with Cycles - CUDA seems to make some chunks of points disapear randomly
This looks like this has been fixed in 3.5, but i didn't find when. Can this be fix in LTS ?
Exact steps for others to reproduce the error
Delete the default cube and add a plane
Add a Geonode Modifier on that plane
Distribute Points on Faces > Density : 250'000
Set Point Radius > 0.0025 (for convenience)
Switch to Cycles, GPU
Switch the render device to CUDA
Results with :
Bug is visible in both viewport shading and Render.
Added subscriber: @Peine_Perdue
Added subscriber: @Viop-3
Added subscriber: @PratikPB2123
Changed status from 'Needs Triage' to: 'Needs User Info'
Hi, thanks for the report. I'm unable to repro this in 3.3 either.
Can you share .blend file?
Added subscriber: @iss
Can't reproduce on
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 526.98
I've been able to reproduce on every linux build i tried on 3.3
@Peine_Perdue ^
Hi, any updates?
Here's the file. Although it's only the 4 same steps as described in the report. Just tried on a Windows build and couldn't reproduce the error. Tried again on another Linux machine and the bug is consistent.
@lichtwerk , can you confirm it on linux?
Can confirm, let me check if I can find the commit...
testing this with CUDA 12, bisecting unfortunately doesnt give a solution (all tested versions seem fine here)
The buildbot builds show that this got "fixed" between
c02ec74405and9719fd6964though.@brecht / @pmoursnv possibly know more...
Cycles GPU CUDA rendering high number of points seems broken in LTSto Cycles GPU CUDA rendering high number of points seems broken in LTS (main is fine, request for backport)