hello try Line Loop(12) = {1, 2, -8, -9, 7}; Plane Surface(13) = {12}; instead of Curve Loop(12) = {1, 2, -8, -9, 7}; Plane Surface(13) = {12}; and it will work much better!! -- jean pierre aubry jeanpierreaubry[at]ouvaton.org 33 688 670 795