[vtkusers] GeometryIds extraction

[Hector Dejea]

Hi all,

I generated a .vtu file with Elmer that contains several bodies within it,
each one represented by GeometryIds.

I know how to extract the bodies in Paraview using Selection Query but I'd
like to get it by using VTK.

Does anyone know how can I extract the diferent bodies using GeometryIds in
VTK?

Thank you.
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