Luxar Viewer API Documentation - v2026.9.22
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    PhysicalKnobProp:
        | "roughness"
        | "metalness"
        | "clearcoat"
        | "clearcoatRoughness"
        | "iridescence"
        | "sheen"
        | "transmission"
        | "ior"
        | "thickness"
        | "attenuationDistance"
        | "dispersion"

    The three property a knob writes — the same name on both three classes.