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From: jeffry@bu-pub.bu.edu (Jeffry Nimeroff)
Newsgroups: comp.graphics
Subject: Bartel's basis evaluation function
Keywords: Surfaces
Message-ID: <56968@bu.edu.bu.edu>
Date: 9 May 90 00:03:30 GMT
Sender: news@bu.edu.bu.edu
Reply-To: jeffry@bu-pub.bu.edu (Jeffry Nimeroff)
Organization: Boston University
Lines: 15

Hello all,
	A little while ago, Richard Bartels posted an algorithm that calculated
the deBoor-Cox recurrance relation, and gave a method for calculating b-spline
curves based on the algorithm.  I have had some problems generalizing the
use of the evaluation algorithm to include NURBS patches.  If someone out there
can flip my light switch (so to speak), I would be most appreciative.  As of
today's date, I am calculating b-splines the old fashioned way.  I call 
deBoor-Cox recursively and compute a summation.  This is tediously slow.  I am
just starting with curves and surfaces, and also would like to know if people
have a preference as to the "best" book for curve and surface basics.  I 
have Farin, and Bartels, and can't decide which one to start to churn through.

-Jeff Nimeroff
.nosig