profile p1 x 3 y 1 x -2 y 2 x -1 y -3
prism pr1 p1 0 0 1
profile p2 x 0.5 y 0.5 x -0.5 y -0.5
trotate p2 0 0 0 1 0 0 90
ttranslate p2 1 4 0.25
trotate p2 0 0 0 0 0 1 -15
explode pr1 f
compound pr1_3 pr1_4 fu

featprism pr1 p2 p2 -2 -4 0 1 1
featperform prism result fu

set square 26.9296
