[vtkusers] how to Set CellType to VTK_TETRA (=10)

[Longfei Cong]

Hi :
    i want to use  vtkPolyData  to build a hexahedron (VTK_TETRA (=10)) mesh, but the result mesh is VTK_QUAD (=9). How can i reset the type of the mesh.Wish for help!!!!!
Thank you!!!!!

Longfei
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