OCCT

puts "========================"
puts " OCC605"
puts "========================"
puts ""
##############################
## No any faces in result of pipe command.
##############################
pload ALL

restore [locate_data_file OCC605a.brep] w1 
settolerance w1 1.e-7
checkshape w1
restore [locate_data_file OCC605b.brep] w2 
checkshape w2

if { [catch {pipe result w2 w1 } catch_result] } {
    puts "Faulty OCC605: function PIPE works with exception."
} else {
    explode result f
    set nom 0
    set j 1
    repeat 20 {
	if { [regexp {FACE} [whatis result_$j]] != 1 } {
    	    break
        } else {
    	    set nom [expr $nom + 1]
        }
	incr j
    }
    if { $nom == 0 } {
	puts " Faulty OCC605: Result of PIPE operation is incorrect !!! "
    } else {
	puts "OCC605 OK : Result of PIPE operation is NOT empty shell!!! "
   }
}

checkprops result -s 20.6253
checkshape result
checkview -display result -2d -path ${imagedir}/${test_image}.png