Is there a list anywhere of all the PBRMaterial properties, metallicRoughnessMaterial properties, and specularGlossinessMaterial properties that are not saved/encoded into glTF/glb? Thanks.
Good question. No, we don’t have an explicit list, but I’d be interested in possibly adding that to our documentation somewhere.
For a start, there is an exhaustive List of gltf material properties in the specification. Should be fairly straight forward to match those up with the PBR properties.
To add onto this previous answer, here is a (hopefully) exhaustive list of what glTF functionality is currently supported