OCCT

puts "========"
puts "OCC26798"
puts "========"
puts ""
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# Boolean operations: keep desired cells and boundaries in the result
#######################################################################

smallview

pcylinder s1 10 20
plane p 0 0 0 1 0 0 
mkface f p

bclearobjects
bcleartools
baddobjects s1 f
bfillds
bbuild r
explode r so

copy r_1 s1
copy r_2 s2

pcylinder s3 5 20
ttranslate s3 0 -10  0

donly s1 s2 s3
 
bclearobjects
bcleartools
baddobjects s1 s2 s3
bfillds
bcbuild r

bcremoveall 
bcaddall result -m 1
bcremove result s1 0 s2 1 s3 0
bcadd result s1 0 s2 1 s3 0
bcremoveint result
bcmakecontainers result

donly result
fit

checkprops result -s 2998.06