Hi Chriss,

it really makes fun to work with FFD! I looked at your code and found the factorial function where you mentioned to encrease performance by adding a table for factorials. I made it dynamic and it boosts your code! Just replace the section with:

#used by calcBernstein. could be replaced by a table since in 
#this application n is never more than 3 (number of control points).
$fTable = []
def factorial(n)
    sum = $fTable.rassoc(n)
    if sum
    	return sum[0]
    else
	sum = 1
	sum.upto(n) { |i| sum *= i }
	$fTable << [sum, n]
	return sum
    end
end

Ciao, Stefan