On Mon, May 14, 2012 at 4:16 PM, hanene jeder <hanene-jeder at hotmail.fr> wrote: > How can I do that please!!! this is my code: Please keep your responses on the mailing list. This example shows how to add a cell to a polydata. http://www.vtk.org/Wiki/VTK/Examples/Cxx/GeometricObjects/Triangle David