            writer = vtkTIFFWriter()
        else:
            writer = vtkPNGWriter()

        windowto_image_filter = vtkWindowToImageFilter()
        windowto_image_filter.SetInput(renWin)
--
            writer = vtkTIFFWriter()
        else:
            writer = vtkPNGWriter()

        windowto_image_filter = vtkWindowToImageFilter()
        windowto_image_filter.SetInput(renWin1)
