BBTK_INPUT(Viewer3D,In1,"Input actor",vtkProp3D *,"");
BBTK_INPUT(Viewer3D,In2,"Input actor",vtkProp3D *,"");
BBTK_INPUT(Viewer3D,In3,"Input actor",vtkProp3D *,"");
BBTK_INPUT(Viewer3D,In1,"Input actor",vtkProp3D *,"");
BBTK_INPUT(Viewer3D,In2,"Input actor",vtkProp3D *,"");
BBTK_INPUT(Viewer3D,In3,"Input actor",vtkProp3D *,"");