[Paraview] Create mesh of outline

[Reinhard Hameeteman]

Hi all,

I am trying to get a mesh from 3 of the 6 planes that form the border
of an image. Actually I want exactly what is show by the "extract
subgrid or subsample" icon on the toolbar. This seems a trivial task,
but for a newbie like me it seems a hidden property.
Could anyone give me some clues?

Thanks,
Reinhard