[vtkusers] best way to export a surface and reload it

[João Domingos]

Hey all,

I have a closed surface, basically an elipse, defined by:

cf = vtk.vtkContourFilter
cf.SetInputConnection(surf.GetOutputPort())
cf.SetNumberOfContours(0)
cf.SetValue(0,0)

How can I export this cf surface to a file and how can I read it on
later and simply use it, just as if I had created it?

I took a look at teh vtkOBJExporter and vtkOBJReader, but this saves a
vtkrenderwindow... not a surface.

Big thanks in advance,
Joao