bsplinecurve w1 3 2  -1.0 4   1.0 4  0 0 0 1  2 10 0 1  4 6 0 1  10 0 0 1
mkedge w1 w1 
polyline w2 10 0 0 3 -5 0 0 0 0
wire w w1 w2
mkplane w w
prism s w 0 0 10

OFFSETSHAPE 1 {s_2 s_3} $calcul $type

set volume 330.763