restore [locate_data_file cts21570_1.rle] w1
restore [locate_data_file cts21570_2.rle] w2
orientation w1 F
orientation w2 R
orientation w1 R
setflags w1 locked
setflags w2 locked
thrusections result 1 0 w1 w2 -safe
checkprops result -s 29817.5