[vtkusers] unstructured grid + tetrahedrons

[Baliki B.]

Hi,

i have an unstructured grid (a file) which contains tetrahedrons.
I read the file with vtkUnstructuredGridReader.
Then i use a vtkDataSetMapper but i  don't really get the tetrahedron but
the boundary tringles.

What am i doing wrong?
How can i visualize it so that i can see the tetrahedrons?

(Sorry if my questions are "stupid".)
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