puts "================"
puts "OCC13"
puts "================"
puts ""
##################################################
## It is impossible to intersect two surfaces
##################################################

restore [locate_data_file OCC13-1.draw] su1 
############### checkshape su1 # is not a topological shape
restore [locate_data_file OCC13-2.draw] su2
############### checkshape su2 # is not a topological shape

#Try to intersect two surfaces with tolerance 0.1
#note that distance between shapes is about 0.005942345501409

catch {intersect res su1 su2 0.1 } result
set nom 0
  set j 1
   repeat 10 {
    set che [whatis res_$j]
     set che1 [whatis res_$j]
      set err [lindex $che [expr [llength $che] - 1]]
       set err1 [lindex $che1 [expr [llength $che1] - 2]]
        if { $err != "curve" && $err1 != "3d"} {
          break
        } else {
          set nom [expr $nom + 1]
          
          #Check, if curve has non-zero length
          set info [length res_$j]
          regexp {The length res_1 is+ +([-0-9.+eE]+)} $info full ll
          if {${ll} < 1.0e-7} {
            puts "Error : res_$j has null-length"
          }
          
          incr j
        }
   }
if { $nom == 0} {
  puts "Error : Intersection was made WRONGLY"
}