[comp.graphics] Trimming curves for NURBs

cmm@creare.UUCP (Chris Morley) (11/14/89)

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