PrincipledBSDF Transmission does not work in Eevee Metal with AMD graphics card #104266

New Issue

Martin Ackerl · 2023-01-31T21:27:32+01:00

Martin Ackerl commented

2023-01-31 21:27:32 +01:00

System Information
Operating system: macOS-13.1-x86_64-i386-64bit 64 Bits
Graphics card: Metal API AMD Radeon Pro Vega 64 1.2

Blender Version
Broken: version: 3.5.0 Alpha, branch: master, commit date: 2023-01-30 22:48, hash: ea8fd343eb
Worked: (newest version of Blender that worked as expected)

Short description of error
On the Einar - Real-Time Realism Demo https:*studio.blender.org/films/charge/?asset=6279 Einars eyes appear black in the render when using Metal GPU Backend.
When using OpenGL GPU Backend the render looks OK.
I suppose it has something to do with "Screen Space Reflections" because it has the same effect when turning it off.
The problem seems to occur only in the Intel version of Blender. I was able to test it on a MacStudio with M1 Ultra where the render was OK with Metal GPU Backend.

Exact steps for others to reproduce the error
In Preferences, System set The GPU Backend to Metal, restart Blender.
Download and open the Einar Test file from https:*studio.blender.org/films/charge/?asset=6279
Hit Render.

**System Information** Operating system: macOS-13.1-x86_64-i386-64bit 64 Bits Graphics card: Metal API AMD Radeon Pro Vega 64 1.2 **Blender Version** Broken: version: 3.5.0 Alpha, branch: master, commit date: 2023-01-30 22:48, hash: `ea8fd343eb` Worked: (newest version of Blender that worked as expected) **Short description of error** On the Einar - Real-Time Realism Demo [https:*studio.blender.org/films/charge/?asset=6279 ](https:*studio.blender.org/films/charge/?asset=6279) Einars eyes appear black in the render when using Metal GPU Backend. When using OpenGL GPU Backend the render looks OK. I suppose it has something to do with "Screen Space Reflections" because it has the same effect when turning it off. The problem seems to occur only in the Intel version of Blender. I was able to test it on a MacStudio with M1 Ultra where the render was OK with Metal GPU Backend. **Exact steps for others to reproduce the error** In Preferences, System set The GPU Backend to Metal, restart Blender. Download and open the Einar Test file from [https:*studio.blender.org/films/charge/?asset=6279 ](https:*studio.blender.org/films/charge/?asset=6279) Hit Render. ![metal.jpg](https://archive.blender.org/developer/F14223844/metal.jpg) ![opengl.jpg](https://archive.blender.org/developer/F14223846/opengl.jpg)

Martin Ackerl commented

2023-01-31 21:27:32 +01:00

Added subscriber: @martin.ackerl

William Reynish commented

2023-01-31 22:12:44 +01:00

Added subscriber: @WilliamReynish

William Reynish commented

2023-01-31 22:12:44 +01:00

Seems to work correctly here on M1 though:

(Latest Trunk with the metal backend enabled)

Seems to work correctly here on M1 though: (Latest Trunk with the metal backend enabled) ![Screenshot 2023-01-31 at 22.12.27.png](https://archive.blender.org/developer/F14224146/Screenshot_2023-01-31_at_22.12.27.png)

Richard Antalik commented

2023-02-01 08:59:33 +01:00

Added subscriber: @iss

Richard Antalik commented

2023-02-01 08:59:33 +01:00

Can't reproduce here as well. But hair is green and UI completely unresponsive.

Operating system: macOS-13.0.1-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon Pro 5700 XT OpenGL Engine ATI Technologies Inc. 4.1 ATI-4.9.48

Can't reproduce here as well. But hair is green and UI completely unresponsive. Operating system: macOS-13.0.1-x86_64-i386-64bit 64 Bits Graphics card: AMD Radeon Pro 5700 XT OpenGL Engine ATI Technologies Inc. 4.1 ATI-4.9.48

Martin Ackerl commented

2023-02-01 12:19:08 +01:00

In #104266#1482480, @iss wrote:
Can't reproduce here as well. But hair is green and UI completely unresponsive.

Operating system: macOS-13.0.1-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon Pro 5700 XT OpenGL Engine ATI Technologies Inc. 4.1 ATI-4.9.48

Thanks for testing, but it seems you are on OpenGL Backend.
Please switch Blender to Metal GPU Backend and restart Blender. (Preferences, System)
Please check if you are using the latest Blender 3.5.0 Alpha.
(Also your macOS is one update behind)

> In #104266#1482480, @iss wrote: > Can't reproduce here as well. But hair is green and UI completely unresponsive. > > Operating system: macOS-13.0.1-x86_64-i386-64bit 64 Bits > Graphics card: AMD Radeon Pro 5700 XT OpenGL Engine ATI Technologies Inc. 4.1 ATI-4.9.48 Thanks for testing, but it seems you are on OpenGL Backend. Please switch Blender to Metal GPU Backend and restart Blender. (Preferences, System) Please check if you are using the latest Blender 3.5.0 Alpha. (Also your macOS is one update behind)

Richard Antalik commented

2023-02-01 14:01:26 +01:00

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

Richard Antalik commented

2023-02-01 14:01:26 +01:00

Ah you are correct, I used OpenGL backend. I remember switching to Metal, but that's besides the point. With Metal, I can confirm.

Will bisect, but wil get to that only tomorrow.

Ah you are correct, I used OpenGL backend. I remember switching to Metal, but that's besides the point. With Metal, I can confirm. Will bisect, but wil get to that only tomorrow.

Richard Antalik commented

2023-02-01 14:05:24 +01:00

Eh sorry for noise, Will lower priority, Thought this is regression, but it isn't.