polyline p 0 0 0 5 0 0 7 0 3 3 0 3 4 0 1 1 0 1 2 0 3 -2 0 3 0 0 0
mkplane f p
prism s f 0 5 0

OFFSETSHAPE 0.6 {} $calcul $type

checkprops result -v 216.363

checknbshapes result -shell 1
