[vtkusers] adding values at edge midpoints

[David Doria]

On Tue, Apr 12, 2011 at 9:13 PM, Nico Schlömer <nico.schloemer at gmail.com>wrote:

> Hi all,
>
> so I have this vtkUnstructuredGrid here and would like to add values
> at the midpoints of the edges. -- Is that possible at all?
>
> Cheers,
> Nico
>

Is the unstructured grid a polygonal mesh?  You can find the midpoints by
finding vertices which share an edge:
http://www.vtk.org/Wiki/VTK/Examples/Cxx/PolyData/VertexConnectivity

and then computing the midpoint. If you're looking to change the topology of
the mesh to include these new midpoints you can look at the subdivision
filters:
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Meshes/Subdivision

David
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