puts "========"
puts "OCC29712"
puts "========"
puts ""
#################################################
# Extrema algorithm raises exception
#################################################

# Curves c1 and c2 lie on parallel lines.
# However, they are bounded (trimmed) curves
# and are shifted relatively to each other. So,
# there exists single perpendicular only. 

line c1 0 0 0 1 0 0
line c2 0 4 0 -1 0 0
trim c1 c1 0 1 
trim c2 c2 -2 -1

foreach a [ directory ext_* ] { unset $a }
extrema c1 c2
if { [llength [ directory ext_* ] ] != 1 } {
  puts "Error: Wrong number of solutions (c1 c2)"
}

checklength ext_1 -l 4.0 -eps 2.0e-8

foreach a [ directory ext_* ] { unset $a }
extrema c2 c1
if { [llength [ directory ext_* ] ] != 1 } {
  puts "Error: Wrong number of solutions (c1 c2)"
}

checklength ext_1 -l 4.0 -eps 2.0e-8