ren.ResetCamera();
resetCamera();
  public void keyPressed(KeyEvent e)    {      if (ren.VisibleActorCount() == 0) return;      char keyChar = e.getKeyChar();            if ('r' == keyChar)        {        ren.ResetCamera();        this.Render();        }      if ('u' == keyChar)        {        vtkPicker picker = new vtkPicker();        picker.Pick(lastX,700 - lastY,0.0,ren);                }      if ('w' == keyChar)        {        vtkActorCollection ac;        vtkActor anActor;        vtkActor aPart;        int i, j;                ac = ren.GetActors();        ac.InitTraversal();        for (i = 0; i < ac.GetNumberOfItems(); i++)          {          anActor = ac.GetNextActor();          anActor.InitPartTraversal();          for (j = 0; j < anActor.GetNumberOfParts(); j++)            {             aPart = anActor.GetNextPart();            aPart.GetProperty().SetRepresentationToWireframe();            }          }        this.Render();        }      if ('s' == keyChar)        {        vtkActorCollection ac;        vtkActor anActor;        vtkActor aPart;        int i, j;                ac = ren.GetActors();        ac.InitTraversal();        for (i = 0; i < ac.GetNumberOfItems(); i++)          {          anActor = ac.GetNextActor();          anActor.InitPartTraversal();          for (j = 0; j < anActor.GetNumberOfParts(); j++)            {             aPart = anActor.GetNextPart();            aPart.GetProperty().SetRepresentationToSurface();            }          }        this.Render();        }    }