visual artifacts with GPU but not CPU using cycles #75967

New Issue

Ed Beroset · 2020-04-21T15:14:15+02:00

Ed Beroset commented

2020-04-21 15:14:15 +02:00

System Information
Operating system: Linux-5.5.16-200.fc31.x86_64-x86_64-with-fedora-31-Thirty_One 64 Bits
Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 440.82

Blender Version
Broken: version: 2.90 (sub 0), branch: master, commit date: 2020-04-20 18:51, hash: 55a2682348
Worked: 2.82a (stock version as packaged for Fedora 31)

Short description of error
When rendering a shiny object, there are annoying visual artifacts when rendering with GPU but not when rendering with CPU.
with GPU:

with CPU:

Exact steps for others to reproduce the error
shiny_torus.blend
Load the attached blender file which contains a single torus mesh using Principled BSDF shader with Base Color=0xE7DBA0, Metallic=0.618, Roughness=0.286, all other settings default. Render with cycles using CPU only to get expected result. Render with GPU or GPU+CPU to get corrupted result. Note that I am using CUDA 10.2 although I realize that only 10.1 is officially supported.

System info file also attached.system-info.txt

**System Information** Operating system: Linux-5.5.16-200.fc31.x86_64-x86_64-with-fedora-31-Thirty_One 64 Bits Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 440.82 **Blender Version** Broken: version: 2.90 (sub 0), branch: master, commit date: 2020-04-20 18:51, hash: `55a2682348` Worked: 2.82a (stock version as packaged for Fedora 31) **Short description of error** When rendering a shiny object, there are annoying visual artifacts when rendering with GPU but not when rendering with CPU. with GPU: ![gpu_render.png](https://archive.blender.org/developer/F8487387/gpu_render.png) with CPU: ![cpu_render.png](https://archive.blender.org/developer/F8487386/cpu_render.png) **Exact steps for others to reproduce the error** [shiny_torus.blend](https://archive.blender.org/developer/F8487384/shiny_torus.blend) Load the attached blender file which contains a single torus mesh using Principled BSDF shader with Base Color=0xE7DBA0, Metallic=0.618, Roughness=0.286, all other settings default. Render with cycles using CPU only to get expected result. Render with GPU or GPU+CPU to get corrupted result. Note that I am using CUDA 10.2 although I realize that only 10.1 is officially supported. System info file also attached.[system-info.txt](https://archive.blender.org/developer/F8487396/system-info.txt)

Ed Beroset commented

2020-04-21 15:14:15 +02:00

Added subscriber: @beroset

Ed Beroset commented

2020-04-21 17:01:30 +02:00

possibly related: https://developer.blender.org/T75685

mantissa commented

2020-04-22 12:25:16 +02:00

Added subscriber: @Mantissa

mantissa commented

2020-04-22 12:25:16 +02:00

Switching to CUDA 10.1 will solve this. As the docs state 10.1 is currently the supported version.
https://wiki.blender.org/wiki/Building_Blender/CUDA

Switching to CUDA 10.1 will solve this. As the docs state 10.1 is currently the supported version. https://wiki.blender.org/wiki/Building_Blender/CUDA

Brecht Van Lommel commented

2020-04-22 16:43:34 +02:00

Closed as duplicate of #74423

Brecht Van Lommel closed this issue

2020-04-22 16:43:34 +02:00

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visual artifacts with GPU but not CPU using cycles #75967