pcylinder b1 1 4
pcylinder b2 1 4
ttranslate b2 1 0 0
trotate b2 1 0 0 0 0 1 -120
trotate b2 0 0 0 0 0 1 60

bop b1 b2
boptuc result

checkprops result -s 28.9592
checkview -display result -2d -otherwise { b1 b2 } -s -path ${imagedir}/${test_image}.png