Thanks! You’ll have to carefully test this PR against at least Unity 2021.3 and 6 in all three of URP, HDRP and BiRP. A lot of changes have happened in this codepath and at some point „-1“ was the correct value for „auto queue“.

You’ll also have to test runtime behavior – importing an opaque or transparent object at runtime needs to end up looking correctly.

It looks like UnityGLTF 2.16.1 is not compatible with Unity 2021.3.45 (Latest available version except Enterprise releases).

I'll continue testing on other Unity versions.

On 2022.3.62 BiRP:

Imported material's Queue Control isn't Auto without the fix and the material variant's Render Queue is Geometry even when it's changed to Transparent.

After the fix, both materials are good.

Runtime import of 2 models (transparent and opaque) on 2022.3.62 BiRP. Before the fix, rendering of transparent model is already wrong in built game. The fix doesn't make it any worse.

On 2022.3.62 URP (Same result as BiRP):

Imported material's Queue Control isn't Auto without the fix and the material variant's Render Queue is Geometry even when it's changed to Transparent.

After the fix, both materials are good.

Runtime import of 2 models (transparent and opaque) on 2022.3.62 URP (Same result as BiRP). Before the fix, rendering of transparent model is already wrong in built game. The fix doesn't make it any worse.

On 6000.0.32 URP (Same result as 2022 BiRP and 2022 URP):

Imported material's Queue Control isn't Auto without the fix and the material variant's Render Queue is Geometry even when it's changed to Transparent. (LOL. Material Variant creation is missing in Unity 6. I duplicated the imported material. What are these guys doing in Unity???)

After the fix, both materials are good.

Runtime import of 2 models (transparent and opaque) on 6000.0.32 URP (Same result as 2022 BiRP and 2022 URP). Before the fix, rendering of transparent model is already wrong in built game. The fix doesn't make it any worse.

Looks like UnityGLTF shader doesn't support HDRP on Unity 6 so I can't test on it.

@hybridherbst My tests are done.

Conclusion: my fix really fixes the imported material's Queue Control to be Auto.
It doesn't break anything that isn't broken before it.

Can you please check and merge when you have free time? Thank you.

P.S. All test projects are attached.
Test Projects.zip