OCCT

puts "========"
puts "OCC163"
puts "========"
puts ""
###########################################################
## The result of extrema command is not correct. 
## Extrema command return max, but it acceptable because relative error near 1.0e-30.
###########################################################

restore [locate_data_file OCC130.brep] res 

checkshape res

line l -120 -100 400 0 0 1
mksurface s res

set che [extrema l s]
set err [llength $che]

# Amount Check
if { $err != 1} {
    puts "Error: Invalid extrema number"
}

set status 0
set info [dump ext_1]
regexp "Parameters : 0 +(\[-0-9*\.+eE\]+)" $info full extLength

# Test max
if { $extLength > 35 && $extLength < 36} {
    set good_dist 35.6687907545308
    checkreal "Max distance:" ${extLength} ${good_dist} 0.01 0.01
    set status 1
}

# Test min
if {$extLength > 0 && $extLength < 1} {
    set good_dist 0.0
    checkreal "Min distance:" ${extLength} ${good_dist} 0.01 0.01
    set status 1
}

# Not min or max
if {$status == 0} {
    puts "Error: wrong extrema point"
}