ellipse ellipse 0 0 0 30 10 revsurf rs_ellipse ellipse 0 40 0 1 0 0 offset rs_ellipse_of rs_ellipse 5 offset rs_ellipse_of_of rs_ellipse_of 5 mkface result rs_ellipse_of_of 0 1 0 1 set MaxFTol 9.9999999999999995e-08 set MaxETol 9.8042899546079609e-07 set MaxVTol 9.8042899546079652e-07