I added a sample of glTF Materials Common to the sample list below.
However, it was all displayed in gray. Is Babylon.js + glTF Loader unsupported by glTF-MaterialsCommon?
https://cx20.github.io/gltf-test/
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glTF-MaterialsCommon/Duck.gltf
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glTF-MaterialsCommon/Box.gltf
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