Transparent materials appear black or opaque after runtime import on Meta Quest.

[EfimBash]

Describe the bug 💬

When placing the GLB model in the Unity scene before building the app, all transparent materials (e.g., glass and EyeAO) render correctly. However, after building the app and loading the model at runtime using the GLTFComponent, all surfaces with transparent materials are rendered as black or opaque instead of transparent.

On the left (black eyes), you can see the model that has been instantiated, and on the right, the model that was already in the scene.

Steps to reproduce 🔢

1. Open Unity and place the GLB model directly into the scene. (this will work fine)
2. Ensure the transparent materials (e.g., glass of the glasses, EyeAO) are displayed correctly in the editor.
3. Add a EmptyGO with a GLTFComponent attached to it. This is what will instantiate the avatarToTest.glb at run time .
4. Add the avatarToTest.glb to a streaming assets folder in the project and reference it in the GLTFComponent .
5. Build and run the application.
6. At runtime, use the GLTFComponent to load the same GLB model into the scene.
7. Observe the model’s materials: all surfaces with transparent materials are rendered as black or opaque instead of transparent.

Files to reproduce the issue ♻

avatarToTest.zip

Editor Version 🎲

2022.3

Render Pipeline and version

URP

UnityGLTF Version

2.14.1

Operating System 👩‍💻

Android

When does this problem happen?

• Editor Import
• Runtime Import
• Editor Export
• Runtime Export

Additional Info 📜

No response

Validations 🩹

• I have searched existing issues: no issue already exist that reports the same problem.
• I follow the Code of Conduct
• I provided a minimal reproducible example, including files when necessary.

[hybridherbst]

Thanks for providing a test file –
Looks like for some reason the rough refraction pass isn't correctly set up for the runtime material in your case here.
We'll look at it!

[ciotonyleone]

verified indeed seems to be a problem with the pbrgraph shader, with gltfast no problem. looking forward to the bug being closed

[ciotonyleone]

@hybridherbst @pfcDorn do you have a guess as to when we might get a version with this fix?

[hybridherbst]

@pfcDorn could you please check this again? Thanks!

[EfimBash]

Hi @hybridherbst @pfcDorn, I wanted to check in on this issue. Could you provide an update on the progress or if any further details are needed? Let me know if I can help in any way. Thanks!

[hybridherbst]

Hey @EfimBash could you try on latest dev?

I think you can use this URL in your manifest.json:

https://github.com/KhronosGroup/UnityGLTF.git#77cdc3f49e775ca02c32d99e9d5e94ba851aea33

[EfimBash]

Hi @hybridherbst,
I have tested with the latest dev, but unfortunately, I still have the problem with the GLB instantiated at runtime.

Let me know how can I help