OCCT

puts "================"
puts "OCC636"
puts "================"
puts ""
#####################################
## BRepOffsetAPI_MakePipeShell builds twisted pipe
#####################################

restore [locate_data_file OCC636a.brep] s 
checkshape s

restore [locate_data_file OCC636b.brep] s1 
checkshape s1

restore [locate_data_file OCC636c.brep] s2 
checkshape s2

mksweep s
addsweep s1
addsweep s2

if [catch { buildsweep result } catch_result] {
    puts "Faulty OCC636: function buildsweep works wrongly"
} else {
    puts "OCC636 OK: function buildsweep works properly"
}

checkprops result -s 3987.85 -eps 0.1
checkshape result
checkview -display result -2d -path ${imagedir}/${test_image}.png