code: function createDefaultMaterial() {
  
      return new THREE.MeshStandardMaterial( {
          color: 0xFFFFFF,
          emissive: 0x000000,
          metalness: 1,
          roughness: 1,
          transparent: false,
          depthTest: true,
          side: THREE.FrontSide
      } );
  
  }
docs: Specification: https://github.com/KhronosGroup/glTF/blob/master/specification/2.0/README.md#default-material