// BBTK_DECLARE_INPUT(InVtkObject,vtkObject *);
BBTK_DECLARE_INPUT(Isovalue,double);
BBTK_DECLARE_INPUT(Opacity,double);
BBTK_DECLARE_INPUT(Colour,std::vector<double>);
BBTK_DECLARE_INPUT(Renderer,vtkRenderer *);
// BBTK_DECLARE_INPUT(InVtkObject,vtkObject *);
BBTK_DECLARE_INPUT(Isovalue,double);
BBTK_DECLARE_INPUT(Opacity,double);
BBTK_DECLARE_INPUT(Colour,std::vector<double>);
BBTK_DECLARE_INPUT(Renderer,vtkRenderer *);