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From: dfr@usna.navy.mil (Prof. David F. Rogers (Aerospace) <dfr@usna>)
Newsgroups: comp.graphics
Subject: Re: help with NURBS on SGI h/w
Keywords: NURBS, surface evaluation
Message-ID: <225@usna.NAVY.MIL>
Date: 20 Feb 91 22:24:51 GMT
References: <1991Feb19.221646.19527@agate.berkeley.edu>
Sender: news@usna.NAVY.MIL
Organization: U. S. Naval Academy, Annapolis, MD
Lines: 55

In article <1991Feb19.221646.19527@agate.berkeley.edu> seth@miro.Berkeley.EDU (Seth Teller) writes:
>In <44374@ut-emx.uucp> blake@ccwf.cc.utexas.edu (Blake Freeburg) writes:
>> I need some help using the SG lib on an RS/6000 and drawing a nurbs surface.
>> blake
>
>In <216@usna.NAVY.MIL>, Prof. David F. Rogers (Aerospace) <dfr@usna> writes:
>>> You don't need to use the SGI hardware to do this efficiently. Look in
>>> the December issue of Computer Aided Design for the paper Dynamic Rational
>>> B-spline Surfaces by Rogers and Adlum. It's all there for the taking.
>>> Dave Rogers
>
>this seems like poor (or at least not necessarily good) advice.  hundreds
>of person-hours have gone into the sgi library so that people like blake
>can draw surfaces with simple procedure calls.  why refer them to something
>unknown (with all due respect)?
>
>i didn't write the sgi nurbs implementation, but i have several years'
>experience working with it and contributing to the development of its
>interface and functionality.  please don't sell it so short.
>

Because I have tried it and don't like it. It is too restrictive, the
explanation in the manual is terrible, etc.

And incidentally I am a fan of SGI's and have a whole room full of them.

Dave Rogers

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