[vtkusers] Bounding box of volume

[xiong fei]

Dear vtkusers

     I have created some volume objects in 3D space,
and now want to build a bounding box to enclose the
whole volume. But what make me confused is how to do
it? It is not as obvious as what it is in VisAD or
Vis5D, can someone help me? Thank you very much.

Best regards

BTW: i have listed the assumed picture below.


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