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

# Curves c1 and c2 lie on parallel lines.
# However, they are bounded (B-spline) curves
# and are shifted relatively to each other. So,
# perpendicular between these curves does not exist but
# extrema must be found as in case "Not-parallel". 

bsplinecurve c1 1 2 0 2 1 2 0 0 0 1 1 0 0 1
bsplinecurve c2 1 2 0 2 1 2 3 4 0 1 4 4 0 1

extrema c1 c2
checklength ext_1 -l [expr sqrt(20)] -eps 2.0e-8