Good evening, Today I have built a complex geometry with autocad and I have imported in gmsh in .IGES format. However after that I try to add--> Plane Surface, the program crash every single time! Why? Thank you -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://www.geuz.org/pipermail/gmsh/attachments/20150526/a8afeb49/attachment.html>