OCCT

puts "========"
puts "OCC165"
puts "========"

restore [locate_data_file OCC165-2.brep] f 
checkshape f

if [catch {mkoffset res1 f 3 10 } result] {
  puts "Faulty OCC165 (case 1) : function MKOFFSET works wrongly"
} else {
  puts "OCC165 OK (case 1): function MKOFFSET works properly"
  mkplane pl1_1 res1_1 
  checkshape pl1_1
  mkplane pl1_2 res1_2 
  checkshape pl1_2
  mkplane pl1_3 res1_3 
  checkshape pl1_3
}

if [catch {mkoffset res2 f 3 -10 } result] {
  puts "Faulty OCC165 (case 2) : function MKOFFSET works wrongly"
} else {
  puts "OCC165 OK (case 2): function MKOFFSET works properly"
  mkplane pl2_1 res2_1 
  checkshape pl2_1
  mkplane pl2_2 res2_2 
  checkshape pl2_2
  mkplane pl2_3 res2_3 
  checkshape pl2_3
}

compound f res1_1 res1_2 res1_3 res2_1 res2_2 res2_3 res
checkprops res1_1 -l 462.832
checkprops res1_2 -l 525.664
checkprops res1_3 -l 588.496
checkprops res2_1 -l 320
checkprops res2_2 -l 240
checkprops res2_3 -l 160