puts "============"
puts "OCC23706"
puts "============"
puts ""
#########################################################################
# Cannot project point on curve
#########################################################################

bsplinecurve r3 2 6 1 3 2 1 3 1 4 1 5 1 6 3 2 5 3 1 3 7 3 1 4 8 3 1 4 8 3 1 4 8 3 1 5 9 3 1 9 7 3 1
bsplinecurve r4 2 6 2 3 2.5 1 3 1 3.5 1 4 1 4.5 3 -1 2 3 1 1 11 3 1 3 9 3 1 3 9 3 1 3 9 3 1 5 7 3 1 7 4 3 1
extrema r3 r4

cvalue ext_1 0 x y z
set info [dump x] 
regexp "(\[-0-9.+eE\])" $info full xx
set info [dump y] 
regexp "(\[-0-9.+eE\])" $info full yy
set info [dump z] 
regexp "(\[-0-9.+eE\])" $info full zz

if { sqrt(($xx - 4.0) * ($xx - 4.0) + 
	      ($yy - 8.0) * ($yy - 8.0) + 
	      ($zz - 3.0) * ($zz - 3.0)) > 1.0e-7} {
    puts "Error : Point of extrema is wrong"
} else {
    puts "OK: Point of extrema is valid"
}