[vtkusers] vtkXdmfReader

[Nico Schlömer]

Hi everyone,

I've been using the `vtkUnstructuredGridReader` and the
`vtkXMLUnstructuredGridReader` for a while now to read VTK/VTU meshes, e.g.,
```
        reader = vtk.vtkUnstructuredGridReader()
        reader.SetFileName(filename)
        reader.Update()
        vtk_mesh = reader.GetOutput()
```
and then
```
    points = vtk.util.numpy_support.vtk_to_numpy(
            vtk_mesh.GetPoints().GetData()
            )
```
etc. From the documentation, it seemed easy enough to phase in the
`vtkXdmfReader`. However,
```
AttributeError: 'vtkIOXdmf2Python.vtkXdmfReader' object has no attribute
'GetOutput'
```
Any hints on how to use the `vtkXdmfReader`?

Cheers,
Nico

[1] http://www.vtk.org/doc/nightly/html/classvtkXdmfReader.html
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