puts "============"
puts "CR28175"
puts "==========="
puts ""
###############################################################################
# Bad result of curve-curve extrema
###############################################################################

pload MODELING

# Prepare curves.
restore [locate_data_file bug28175_border.brep] b
restore [locate_data_file bug28175_segment.brep] s
explode b
explode s
mkcurve cb b_6
mkcurve cs s_1

# Check result of forward arguments order.
extrema cb cs 1
set info [length ext_1]
regexp {The length ext_1 is +([-0-9.+eE]+)} $info full len1
if { $len1 > 1e-7 } {
  puts "Error: extrema finds distance $len1 (parameters [dval prm_1_1] and [dval prm_1_3]"
  puts "while should be 4.5985092243989615e-008 (parameters 23.548772710035486
 and 585.69374860054825"
} else {
 puts "OK: Correct extrema point is found for forward arguments order"
}

# Check result of reversed arguments order.
extrema cs cb 1
set info [length ext_1]
regexp {The length ext_1 is +([-0-9.+eE]+)} $info full len2
if { $len2 > 1e-7 } {
  puts "Error: extrema finds distance $len2 (parameters [dval prm_1_1] and [dval prm_1_3]"
  puts "while should be 4.5985092243989615e-008 (parameters 23.548772710035486
 and 585.69374860054825"
} else {
  puts "OK: Correct extrema point is found for reversed arguments order"
}

# Check that order not influence minimum value.
if { abs ($len1 - $len2) > 1e-4 * ($len1 + $len2) } {
  puts "Error: distance between cb to cs ($len1) is not equal to distance between cs and cb ($len2)"
} else {
  puts "OK: Extrema values are equal for forward and reversed arguments order"
}