Shaders not displayed properly with USD #95203

New Issue

Robert Rioux · 2022-01-25T20:15:59+01:00

Robert Rioux commented

2022-01-25 20:15:59 +01:00

System Information
Operating system: macOS-10.15.7-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon Pro Vega 64 OpenGL Engine ATI Technologies Inc. 4.1 ATI-3.10.18

Blender Version
Broken: version: 3.0.0, branch: master, commit date: 2021-12-02 18:35, hash: f1cca30557
Worked: (newest version of Blender that worked as expected)

Short description of error
I have an object that has been cached in USD with multiple shaders in it. When I load it in Blender, only one shader is applied to everything but it looks ok in edit mode.

Exact steps for others to reproduce the error
Please open the attached file and relink the USD if needed. The woman will be green. Go in edit mode, she will have different colors on her. Doesn't work in Linux with an Nvidia card either.

shaderBug.zip

**System Information** Operating system: macOS-10.15.7-x86_64-i386-64bit 64 Bits Graphics card: AMD Radeon Pro Vega 64 OpenGL Engine ATI Technologies Inc. 4.1 ATI-3.10.18 **Blender Version** Broken: version: 3.0.0, branch: master, commit date: 2021-12-02 18:35, hash: `f1cca30557` Worked: (newest version of Blender that worked as expected) **Short description of error** I have an object that has been cached in USD with multiple shaders in it. When I load it in Blender, only one shader is applied to everything but it looks ok in edit mode. **Exact steps for others to reproduce the error** Please open the attached file and relink the USD if needed. The woman will be green. Go in edit mode, she will have different colors on her. Doesn't work in Linux with an Nvidia card either. [shaderBug.zip](https://archive.blender.org/developer/F12823810/shaderBug.zip)

Robert Rioux commented

2022-01-25 20:15:59 +01:00

Added subscriber: @Funnybob

Robert Rioux commented

2022-01-25 20:20:21 +01:00

It works properly with alembic

Michael Kowalski commented

2022-01-26 03:59:25 +01:00

Added subscriber: @makowalski

Michael Kowalski commented

2022-01-26 03:59:25 +01:00

Thanks for reporting this. I'll take a look.

Philipp Oeser commented

2022-01-26 10:51:49 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2022-01-26 10:51:49 +01:00

Changed status from 'Needs Triage' to: 'Needs Developer To Reproduce'

Philipp Oeser commented

2022-01-26 10:51:49 +01:00

Looks fine here (tested 3.0 and 3.1 Alpha)

**System Information**
Operating system: Linux-5.13.0-0.rc6.45.fc35.x86_64-x86_64-with-glibc2.34.9000 64 Bits
Graphics card: NVIDIA GeForce GTX 970M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 495.44
version: 3.0.0, branch: master, commit date: 2021-12-02 18:35, hash: `rBf1cca3055776`

Seems to be a GPU issue?

@makowalski : can you actually reproduce this?

Looks fine here (tested 3.0 and 3.1 Alpha) ``` **System Information** Operating system: Linux-5.13.0-0.rc6.45.fc35.x86_64-x86_64-with-glibc2.34.9000 64 Bits Graphics card: NVIDIA GeForce GTX 970M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 495.44 version: 3.0.0, branch: master, commit date: 2021-12-02 18:35, hash: `rBf1cca3055776` ``` ![image.png](https://archive.blender.org/developer/F12824902/image.png) Seems to be a GPU issue? @makowalski : can you actually reproduce this?

Michael Kowalski commented

2022-01-27 04:51:36 +01:00

Hi @lichtwerk: Yes, I can reproduce this, but not always as originally described. One way I can reliably reproduce it is to import that USD directly and attempt to change the material colors, which has no effect unless in edit mode. I haven't had a chance to investigate this yet but will do so in the next day or so.

Michael Kowalski commented

2022-02-08 04:38:58 +01:00

@Funnybob My apologies for the delay looking into this. I've identified the source of the bug in the logic for setting material face sets when the mesh sequence cache modifier is applied. I have a solution which I'm currently testing and will update this thread when the fix is ready.

Robert Rioux commented

2022-02-11 13:47:28 +01:00

I sent a bug report for Maya in 1996 and it's still not fixed. You found a solution for this one in about a week. So you're not going to hear any complaints from me. No need to apologize. You deserve all my respect. Thanks Michael!

Michael Kowalski commented

2023-01-29 23:46:46 +01:00

Changed status from 'Needs Developer To Reproduce' to: 'Resolved'

Michael Kowalski closed this issue

2023-01-29 23:46:46 +01:00

Michael Kowalski self-assigned this 2023-01-29 23:46:46 +01:00

Michael Kowalski commented

2023-01-29 23:46:46 +01:00

This bug was actually fixed some time ago as part of refactoring by Hans in https://developer.blender.org/rBf1c0249f34c4. The materials should now be loading correctly. My apologies for not updating the status of this bug sooner.

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Shaders not displayed properly with USD #95203