removeObject3D(type) {
    var obj = this.getObject3D(type);
    if (!obj) {
      warn('Tried to remove `Object3D` of type:', type, 'which was not defined.');
      return;
    }
    this.object3D.remove(obj);
    delete this.object3DMap[type];
    this.emit('object3dremove', {
      type: type
    });
  }
Remove object from scene and entity object3D map.