Difference in rendering alpha between CUDA/Optix and HIP #99970

New Issue

Harlekin · 2022-07-25T17:34:47+02:00

Harlekin commented

2022-07-25 17:34:47 +02:00

System Information
Operating system: Linux, Windows
Graphics card: RTX 2070, RX 5700

Blender Version
Broken:3.2.1 a2d59b2dac master

Short description of error
We noticed some kind of distortion on renders coming from HIP devices, as opposed to the clean result we got from devices running CUDA/Optix. See the images below. The first one was rendered by me on Linux using an RTX 2070, the second one on Windows with an RX 5700. However we get the same correct frames coming from CUDA devices on Windows.
The effect can already be seen in the viewport renders

CUDA/Optix:

HIP:

Blend file:
bug_report.blend

Exact steps for others to reproduce the error
Render the blend file on a CUDA/Optix and a HIP device respectively.

**System Information** Operating system: Linux, Windows Graphics card: RTX 2070, RX 5700 **Blender Version** Broken:3.2.1 a2d59b2dac9e master **Short description of error** We noticed some kind of distortion on renders coming from HIP devices, as opposed to the clean result we got from devices running CUDA/Optix. See the images below. The first one was rendered by me on Linux using an RTX 2070, the second one on Windows with an RX 5700. However we get the same correct frames coming from CUDA devices on Windows. The effect can already be seen in the viewport renders CUDA/Optix: ![bug_report_optix.png](https://archive.blender.org/developer/F13315305/bug_report_optix.png) HIP: ![bug_report_HIP.png](https://archive.blender.org/developer/F13315307/bug_report_HIP.png) Blend file: [bug_report.blend](https://archive.blender.org/developer/F13315310/bug_report.blend) **Exact steps for others to reproduce the error** Render the blend file on a CUDA/Optix and a HIP device respectively.

Harlekin commented

2022-07-25 17:34:47 +02:00

Added subscriber: @randomGuyOnTheInternet

Brecht Van Lommel commented

2022-07-25 21:15:01 +02:00

Added subscriber: @brecht

Brecht Van Lommel commented

2022-07-25 21:15:02 +02:00

Changed status from 'Needs Triage' to: 'Archived'

Brecht Van Lommel closed this issue

2022-07-25 21:15:02 +02:00

Brecht Van Lommel commented

2022-07-25 21:15:02 +02:00

This is a known limitation currently, the clip image extension mode is not supported on HIP.
https://docs.blender.org/manual/en/latest/render/cycles/gpu_rendering.html#hip-amd

This is a known limitation currently, the clip image extension mode is not supported on HIP. https://docs.blender.org/manual/en/latest/render/cycles/gpu_rendering.html#hip-amd

Harlekin commented

2022-07-25 22:27:03 +02:00

Alright, thanks for clearing that up!

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Difference in rendering alpha between CUDA/Optix and HIP #99970