[vtkusers] Polyhedron to regular cell type

[Felipe Bordeu]

hi,
 I'm working on a filter, and I use a Voronoi library (external) to
generate polyhedron cells (VTK_POLYHEDRON). I will like to know if there is
any easy way to identified and to convert some of my polyedron cells to a
regular cells (hexaedron for example).  In most for my cases all the
voronoi cells are "classic" cells ( tetras, hexas, wedge...).

I dont care if the code is expensive, because I do it only in a limited
number of elements (less than 50).

Thanks
Felipe

using c++, (paraview 5.2)
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