[vtkusers] OBB orientation

[Edi Schreibmann]

Was wondering if there is a fast way, or algorithm to get the orientation of 
a OBB.

I have an OBB that is always a paralelipiped, 8 points, his orientation 
changing in time. Is there a algorithm or code to get the normals of the 
paralelipiped's faces, or directly the orientation of the OBB ?

I tried to take the normal to the x,y,z axis by computing the normals to the 
x,y,z faces, form the corner points. But the index of this points changes as 
the OBB's orientation changes in space.

Thank you very much
Edi
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