puts "========"
puts "OCC29972: Intersection curve has a weird gap in the middle of it"
puts "========"
puts ""

puts "TODO OCC27243 ALL: Error: The curve res_1 possibly has a bend"

set GoodNbCurves 2

foreach a [directory res*] {unset $a}

binrestore [locate_data_file bug29972_f1.bin] f1

mksurface s1 f1
plane s2 -145.136225014162, -136.038366, -73.563687 0 0 1 -1 0 0

intersect res s1 s2

if { [info exists res] } {
  #Only variable "res" exists
  renamevar res res_1
}

dset aLambda1 1.0e-5
dset aLambda2 [dval 1-aLambda1]

set ic 1
set AllowRepeat 1
while { $AllowRepeat != 0 } {
  if { ![info exists res_$ic] } {
    set AllowRepeat 0
  } else {
    bounds res_$ic U1 U2
    
    if {[dval U2-U1] < 1.0e-9} {
      puts "Error: Wrong curve's range!"
    }
    
    xdistcs res_$ic s1 U1 U2 100 1.0e-7
    xdistcs res_$ic s2 U1 U2 100 1.0e-7  
    
    #check whether the curve has a loop
    set aFpar [dval U1*aLambda1+aLambda2*U2]
    set aLpar [dval U2]
    
    set delta [expr ($aLpar-$aFpar)/10.0]
    cvalue res_$ic $aFpar xp yp zp dx1 dy1 dz1
    for {set p $aFpar} {$p <= $aLpar} {set p [expr $p + $delta]} {
      cvalue res_$ic $p xp yp zp dx2 dy2 dz2
      
      #Check if the angle between the vectors {dx1 dy1 dz1} and {dx2 dy2 dz2} is less than 40deg.
      set nv1 [ dval dx1*dx1+dy1*dy1+dz1*dz1 ] 
      set nv2 [ dval dx2*dx2+dy2*dy2+dz2*dz2 ] 
      
      set nv1 [ expr sqrt($nv1) ]
      set nv2 [ expr sqrt($nv2) ]
      
      set dp [ dval dx1*dx2+dy2*dy2+dz1*dz2 ] 
      
      if {$dp < [ expr 0.76604444311897803520239265055542 * $nv1 * $nv2 ] } {
        puts "Error: The curve res_$ic possibly has a bend at parameter $p. Please check carefully"
      }      
      
      dset dx1 dx2
      dset dy1 dy2
      dset dz1 dz2
    }
    
    incr ic
  }
}

incr ic -1

if { $ic != $GoodNbCurves } {
  puts "Error: $GoodNbCurves are expected but $ic ones are found"
}

smallview
clear
point p1 57.478209319525746 -120.6955841545726 -125.98789759526636
point p2 57.478010564066473 -120.69677875685414 -125.98860176530741
fit

clpoles s1
don s1 s2
disp res_*

checkview -screenshot -2d -path ${imagedir}/${test_image}.png