[vtkusers] vtkNormal

[David Doria]

> And you are right, in this case, there is only one triangle so i could use a
> vtkPolyData, but in fact with other data, I have a mesh structure with
> points, edges, triangles and polygons in the same time.

That is no problem - that is exactly the definition of what a PolyData
is supposed to store. You only need UnstructuredGrid when you
introduce 3D cells (tetrahedra, etc).

David