[vtkusers] create the polydata volume from unstructured grid

[Dmitry Tyulin]

Hello there!
I have a volume in vtk unstructured grid. How can I convert it to CAD file
format? .stl, for example. In paraview I can run Extract Surface module,
but it gives to me only a surface. So, how can i convert the whole volume
to .stl or .ply?

Regards,
Dmitry.
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