[Gmsh] writing vector data into the msh file from c code

[walter.steffe at alice.it]

Hello
Using Gmsh library from a c code I am writing the mesh data into an output file (ASCI msh format) with a call to GModel::writeMSH().
I would like to store in the same file also the normal vector associated with the points of the triangles that belong to a CAD surface.
I already know how to compute these data.
Is possible to put them in a data structure of Gmsh so that they are transferred to the output file (in the  ElementNodeData section or any other) ?
Thanks
Walter
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