code: function () {
      var cameraEls;
      var newActiveCameraEl;
      cameraEls = this.sceneEl.querySelectorAll('[camera]');
      newActiveCameraEl = cameraEls[cameraEls.length - 1];
      newActiveCameraEl.setAttribute('camera', 'active', true);
    }
docs: Set a different active camera.
  When we choose a (sort of) random scene camera as the replacement, set its `active` to
  true. The camera component will call `setActiveCamera` and handle passing the torch to
  the new camera.