KHR_materials_volume_scatter import #17194
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This isn't at all a full implementation of this WIP extension as the PBRMaterial doesn't have the ability to render SSS in the way expected by the extension. And I haven't started implementing transparency or subsurface in OpenPBRMaterial yet...
However, I think this provides a good starting point for future support in OpenPBRMaterial as it adds the appropriate properties in the material adapter and does the needed conversion to OpenPBR-compatible parameters from glTF.