[vtkusers] VTK hexahedronal unstructured grid

[ISTB]

It is strange that there are no examples in internet about how to create
meshes from points. As I understood, you add 8 points, then you need to add
hexahedron cell (with 8 ids), then you add again 8 points and again
hexahedron cell (with new 8 ids). But when I try to do it, it does not
visualize anything.
Is it the only information the unstructured grid needs? Am I doing something
wrong with ids? I really do not know but it seems to strange to me..



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