Missing texture / material on glTF (glb) import.

[y0nd0]

Godot version:
3.2.2 Standard (GDScript) 64 bit

OS/device including version:
Windows 10 - GLES3

Issue description:
Some glb-files work great, some don't.
I tested a default glb-file from Windows 10 build-in 3D-Viewer. The bee.

Steps to reproduce:
Create a new project and import the glb-file. See that there is no material / texture imported. Only the mesh and animations, etc.
I expected a full support of all material features and textures like albedo, normal, emission, etc.
(No errors on console.)

Demo / Files:

Windows 10 3D-Viewer:

Godot after import:

Source model file (glb):
Download Bee.zip

[Calinou]

cc @fire

[y0nd0]

A working example in the glTF sample models repo Or this duck:
Download Duck.zip

[fire]

Uses a non core gltf extension:

"extensions": {
        "KHR_materials_pbrSpecularGlossiness": {
          "diffuseTexture": {
            "index": 0
          },
          "specularGlossinessTexture": {
            "index": 1
          }
        }
      }

There's already a pr for it. #38438

I'll post a converted scene in a bit.

[fire]

Something is wrong. Not sure what it is yet.

Since godot engine can't render SpecularGlossiness. This is probably the best we can do.

[fire]

You can see it is using glossiness rendering clearly in the blender view and that is not supported.

[y0nd0]

Thanks for investigating. It looks better. This means that only "Principled BSDF (GGX, Burley)" is supported.
Your commit to Godot will convert this in the future, right? I tried to convert it in Blender. But import / export in Blender is a gamble. ... It seems there is an issue with wrong scales / dimensions. Anyway... thanks.
Update: I cannot convert the bee scene in blender. The exported glb-file does not work correctly. There is a scale issue etc. I also have to find a solution to convert the texture for metallic shader. ...

[y0nd0]

I close this issue, because the glb-file material (SpecularGlossiness) is not supported in Godot which only supports MetallicRoughness. It's ok. But Godot should display a message about it and / or convert it, if possible.