[vtkusers] Obtain Points from Polydata

[David Doria]

You can get the coordinates manually with:

double p[3];
points->GetPoint(i, p);

but if you want to write them with a writer (e.g. vtkSimplePointsWriter),
they will always have to be wrapped in a vtkPolyData first
(polydata->SetPoints(points)).

David
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