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

puts "REQUIRED ALL: Error: The curve"

set GoodNbCurves 1

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

restore [locate_data_file bug29972_s3.draw] s1
plane s2 41.3489013503538 536.047793220744 -145.944893918698 0.999990480720734 0 0.00436330928474653 0.00436330928474653 0 -0.999990480720734

intersect res s1 s2 1.0e-4

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

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_$ic s1 U1 U2 100 0.01
    xdistcs res_$ic s2 U1 U2 100 0.01    
    
    #check whether the curve has a loop
    set delta [dval (U2-U1)/1000.0]
    cvalue res_$ic [dval U1] xp yp zp dx1 dy1 dz1
    for {set p [dval U1]} {$p <= [dval U2]} {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 75deg.
      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+dy1*dy2+dz1*dz2 ] 
      
      if {$dp < [ expr 0.25881904510252076234889883762405 * $nv1 * $nv2 ] } {
        puts "Error: The curve res_$ic is possible to have 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
don res_*

fit
clpoles s1
don s1 s2
disp res_*

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