restore [locate_data_file cylindre.rle] cyl
restore [locate_data_file contour.rle] cont
mkplane cont cont
nexplode cyl F

ttranslate cont 0 0 -100
ttranslate cont 0 200 0
featdprism cyl cont cont -10 1 1
featperformval dprism result 100

checkprops result -s 103687