vtkSmartPointer<vtkExtractVOI> mVOIFilter;
vtkSmartPointer<vvGlyph2D> mGlyphFilter;
vtkSmartPointer<vtkPolyDataMapper> mVFMapper;
vtkSmartPointer<vtkExtractVOI> mVOIFilter;
vtkSmartPointer<vvGlyph2D> mGlyphFilter;
vtkSmartPointer<vtkPolyDataMapper> mVFMapper;