Hi, I'm trying to create a cubic 3d mesh for OpenFOAM which would be in fact a 2D-extruded mesh. I'm not too sure how to do it in Gmsh : 1) Create the 2D geometry (a rectangle) 2) Define the plane surface 3) Mesh th2 2D plane 4) ... how to extrude this 2d geo/mesh now ??? Best regards, PODallaire