BBTK_DECLARE_OUTPUT(Renderer,vtkRenderer*);
BBTK_DECLARE_OUTPUT(Interactor,wxVTKRenderWindowInteractor*);
BBTK_PROCESS(Process);
BBTK_DECLARE_OUTPUT(Renderer,vtkRenderer*);
BBTK_DECLARE_OUTPUT(Interactor,wxVTKRenderWindowInteractor*);
BBTK_PROCESS(Process);