///<summary>Deletes all static objects created</summary>
 public static void deleteAllVTKObjects()
 {
     //clean up vtk objects
     rtTester.Dispose();
     if (tempViewer != null)
     {
         tempViewer.Dispose();
     }
     if (tempRenderWindow != null)
     {
         tempRenderWindow.Dispose();
     }
     if (tempRenderWindowInteractor != null)
     {
         tempRenderWindowInteractor.Dispose();
     }
     if (tempw2i != null)
     {
         tempw2i.Dispose();
     }
 }