Nastran bulk format - handle '.dat' extension
Export in bulk format from Catia gives '.dat' files extension. Gmsh can read such format but expects '.bdf' or '.nas'. So, the solution is to rename the file...
I don't know the rule about the correct file extension for this kind of format but I think that if Catia exports '.dat', it's a sufficiently good reason to handle such extension within Gmsh.
Thanks,
Olivier Pierard - Cenaero