The indexes of the faces or edges, from 0
Their color
OptionalmetallicOptional metalness of these faces, from 0 to 1; read for faces only, as are roughness and emissiveRgb
OptionalroughnessOptional roughness of these faces, from 0 to 1
OptionalemissiveOptional light these faces give off, each channel from 0 to 1
The color of some faces or edges of an assembly part, by their indexes.