polyline profile 0 0 0 0 -20 20
bsplinecurve w 2 3 0 3 1 1 2 3 0 0 0 2 100 100 100 1 100 0 0 1 0 0 0 2
mkedge w w
wire w w
pipe result w profile

checkprops result -s 8049.06