PBRMetallic
constructor(name: String? = null, baseColorFactor: FloatArray? = null, baseColorTexture: GLTF2.Material.TextureInfo? = null, metallicFactor: Float? = null, roughnessFactor: Float? = null, metallicRoughnessTexture: GLTF2.Material.TextureInfo? = null, extensions: JsonElement? = null, extras: JsonElement? = null)