aneGeometry, new THREE.ShadowMaterial({
    color: 0x111111,
    opacity: 0.15,
  }));
  shadowMesh.receiveShadow = true;
  scene.add(shadowMesh);

  THREE.ARUtils.loadModel({
    objPath: OBJ_PATH,
    mtlPath: MTL_PATH,
    OBJLoader: undefined, // uses window.THREE.OBJLoader by default
    MTLLoader: undefined, // uses window.THREE.MTLLoader by default
  }).then(function(group) {
    model = group;
    // As OBJ models may contain a group with several meshes,
    // we want all of them to cast shadow
   