OptiX GPU+CPU and CUDA GPU+CPU rendering problem - CPU tiles not correctly rendered #83741

Closed
opened 2020-12-13 23:15:28 +01:00 by Marcus Papathoma · 4 comments

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 460.79

Blender Version
Broken: version: 2.92.0 Alpha, branch: master, commit date: 2020-12-10 21:48, hash: caed4849d0
Worked: blender-2.92.0-caed4849d090-windows64 (CUDA GPU + CPU worked)

Short description of error
When rendering with CUDA + CPU or the new feature OptiX GPU + CPU there are render artefacts. Seems like the CPU Tiles are not correctly rendered.
CUDA GPU+CPU worked before but since the new feature Optix GPU + CPU was added, not anymore.

Exact steps for others to reproduce the error
Open the attached blend file.
Optix_GPU+CPU_test.blend
Go to Edit > Preferences > System > Cycles Render Devices - set to CUDA GPU +CPU
Render > Render Animation
See that some tiles are not correctly rendered.

Go to Edit > Preferences > System > Cycles Render Devices - set to OptiX GPU +CPU
Render > Render Animation
See that some tiles are not correctly rendered.
Blender_CUDA_OptiX_GPU_CPU_render.jpg

**System Information** Operating system: Windows-10-10.0.19041-SP0 64 Bits Graphics card: GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 460.79 **Blender Version** Broken: version: 2.92.0 Alpha, branch: master, commit date: 2020-12-10 21:48, hash: `caed4849d0` Worked: blender-2.92.0-caed4849d090-windows64 (CUDA GPU + CPU worked) **Short description of error** When rendering with CUDA + CPU or the new feature OptiX GPU + CPU there are render artefacts. Seems like the CPU Tiles are not correctly rendered. CUDA GPU+CPU worked before but since the new feature Optix GPU + CPU was added, not anymore. **Exact steps for others to reproduce the error** Open the attached blend file. [Optix_GPU+CPU_test.blend](https://archive.blender.org/developer/F9507213/Optix_GPU_CPU_test.blend) Go to Edit > Preferences > System > Cycles Render Devices - set to CUDA GPU +CPU Render > Render Animation See that some tiles are not correctly rendered. Go to Edit > Preferences > System > Cycles Render Devices - set to OptiX GPU +CPU Render > Render Animation See that some tiles are not correctly rendered. ![Blender_CUDA_OptiX_GPU_CPU_render.jpg](https://archive.blender.org/developer/F9507209/Blender_CUDA_OptiX_GPU_CPU_render.jpg)

Added subscriber: @machieb

Added subscriber: @machieb
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Added subscriber: @Alaska

Added subscriber: @Alaska
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I am able to reproduce this issue with the file provided. However, turning off adaptive sampling fixes the issue for me. This suggests the issue as the same as described in #82351 (Tile stealing glitches with adaptive sampling) - Will merge these reports.

Capture.PNG

I am able to reproduce this issue with the file provided. However, turning off adaptive sampling fixes the issue for me. This suggests the issue as the same as described in #82351 (Tile stealing glitches with adaptive sampling) - Will merge these reports. ![Capture.PNG](https://archive.blender.org/developer/F9508061/Capture.PNG)
Member

Closed as duplicate of #82351

Closed as duplicate of #82351
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Reference: blender/blender#83741
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