jgltf-browser is not support glTF Materials Common?

[cx20]

I tried to display the glTF Materials Common file using jgltf-browser preview release 5.

However, it was all displayed in gray. Is gltf-browser unsupported by glTF-MaterialsCommon?

glTF-MaterialsCommon/Duck.gltf

glTF-MaterialsCommon/Box.gltf

[cx20]

For reference, samples of glTF-MaterialsCommon of other glTF Loader have been added.
https://cx20.github.io/gltf-test/

By the way, Avocado, Barramundi Fish, SmilingFace have no sample of glTF-MaterialsCommon. The absence of the link destination is because the program that automatically generates the sample list does not correspond.

[javagl]

The glTF-MaterialsCommon extension is not (yet) supported.

This extension is not trivial to implement. There are different possible approaches, and I do not yet know which one would make most sense.

One could try to generate the required shaders/programs/technique/materials "at runtime", on the fly. This is (as far as I understood) what is currently done in https://github.com/AnalyticalGraphicsInc/cesium/blob/389cb1d3664536c53755b62a297bd96400abaff8/Source/Scene/modelMaterialsCommon.js

I'm working on a different project, that is actually "independent" of JglTF. The goal of this project is to implement the functionality of the OpenGL fixed function pipeline with shaders. I thought that it should be possible to use these shaders to emulate the glTF-MaterialsCommon functionality. But this is still a very vague idea, and I'm not sure whether it will work as expected.

[cx20]

I understood the current status.