parabola parabola 0 0 0 30
extsurf es_parabola parabola 0 0 1
offset es_parabola_of es_parabola 5
mkface result es_parabola_of 0 3 0 40
set MaxFTol 9.9999999999999995e-08
set MaxETol 1.0920201413103251e-06
set MaxVTol 1.0920201413103255e-06