puts "========"
puts "0030645: Modeling Algorithms - B-spline segmentation produces wrong parametrization"
puts "========"
puts ""

bsplinecurve result 3 4 \
2.0 4  2.5 2  2.9 2  3.0 4 \
117.9 0.0 11.6 1 \
116.7 0.0 11 1 \
115.8 0.0 10.5 1 \
114.4 0.0 9.7 1 \
113.9 0.0 9.4 1 \
113.3 0.0 9.1 1 \
113.1 0.0 9.0 1 \
113.0 0.0 8.9 1


set tolerance 2.e-9
segment result 2.5 2.900000001 $tolerance

set crv [dump result]

regexp {Knots +:\n(.*)} $crv full knots
set is_different_knots 1
set knots_list {}
while { "$knots" != "\n" && $is_different_knots } {
  regexp { +([0-9]+) +: +([-0-9.+eE]+) *([0-9]+)\n(.*)} $knots full index knot weight rest
  foreach k $knots_list {
    if { [expr abs($k - $knot)] < $tolerance } {
      set is_different_knots 0
    }
  }

  lappend knots_list $knot
  set knots $rest
}

if { $is_different_knots } {
  puts "OK: all knots are different"
} else {
  puts "ERROR: segment has knots too close"
}