[vtkusers] save image from render window problem

[victor sv]

Hi all,

I'm trying to migrate this code to VTK-6.0.0:

    w2i = vtk.vtkWindowToImageFilter()
    w2i.SetInput(renderwindow)
    w2i.Modified()
    image = vtk.vtkPNGWriter()
    image.SetInputData(w2i.GetOutput())
    image.SetFileName(file)
    image.Write()

I'dont get any error, but the image is not writed.

anyone knows why?

Thanks,
Víctor.
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