text: import vtkCameraManipulator       from './CameraManipulator';
  import vtkTrackballMultiRotate    from './TrackballMultiRotate';
  import vtkTrackballPan            from './TrackballPan';
  import vtkTrackballRoll           from './TrackballRoll';
  import vtkTrackballRotate         from './TrackballRotate';
  import vtkTrackballZoom           from './TrackballZoom';
  import vtkTrackballZoomToMouse    from './TrackballZoomToMouse';
  
  export default {
    vtkCameraManipulator,
    vtkTrackballMultiRotate,
    vtkTrackballPan,
    vtkTrackballRoll,
    vtkTrackballRotate,
    vtkTrackballZoom,
    vtkTrackballZoomToMouse,
  };
  