BBTK_INPUT(Viewer3D,Obs5,"Input observer",vtkInteractorObserver *,"");
BBTK_INPUT(Viewer3D,Stereo,"Stereo with Red-Blue filter. False/True (default False)",bool,"");
BBTK_OUTPUT(Viewer3D,Renderer,"Renderer to which actors can be added.",vtkRenderer*,"");
BBTK_INPUT(Viewer3D,Obs5,"Input observer",vtkInteractorObserver *,"");
BBTK_INPUT(Viewer3D,Stereo,"Stereo with Red-Blue filter. False/True (default False)",bool,"");
BBTK_OUTPUT(Viewer3D,Renderer,"Renderer to which actors can be added.",vtkRenderer*,"");