[vtkusers] vtk_to_numpy: how to get a vtk_array?

[Mathias Franzius]

Dear ng,

I want to render offscreen into a numpy array. So far it works with writing to disk with a vtkWindowToImageFilter and an ImageWriter and then reloading it with PIL and converting via scipy.misc.fromimage. 
However, the vtk.util.vtk_to_numpy seems much more straight-forward and efficient. 
My problem is: how do I get the rendered image in vtk_data format? Now I use the renderWindow like this:
fil = vtk.vtkWindowToImageFilter()
fil.SetInput(renderWindow);

Thanks!
   Mathias
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