Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!purdue!bu-cs!dartvax!creare!cmm
From: cmm@creare.UUCP (Chris Morley)
Newsgroups: comp.graphics
Subject: Trimming curves for NURBs
Keywords: spline intersections
Message-ID: <1142@creare.UUCP>
Date: 14 Nov 89 15:43:56 GMT
Distribution: na
Organization: Creare Inc., Hanover, NH
Lines: 16

First, many thanks for those prompt & knowledgable replies
to my earlier posts concerning evaluation/basis change of
non-uniform rational b-splines. I ended up not doing the
basis change to segment polynomials, but using a recurrence
formula for evaluation.

I am currently using phigs+ to render nurbs.  What I would
like to do is the ability to interactively create & manipulate
nurbs surfaces. Has anyone seen any references for finding
intersections between two nurbs surfaces and representing 
the intersections as trimming curves on each surface? Is
this a reasonable scheme for dealing with (in terms of both
graphics & solid modelling) intersecting surfaces?

Thanks for any advice you can offer -
Chris Morley	...!dartvax!creare!cmm