1restore [locate_data_file cylindre.rle] cyl 2restore [locate_data_file contour.rle] cont 3mkplane cont cont 4nexplode cyl F 5 6featprism cyl cont cont 0 1 0 1 1 7featperformval prism result 55 cyl_3 8 9checkprops result -s 93360.2 10