Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!apple!usc!cs.utexas.edu!uunet!orca!raven!mwatkins From: mwatkins@raven.dsd.es.com (Mark Watkins) Newsgroups: comp.graphics Subject: Re: Offset surface Message-ID: <1991Feb26.052407.16722@dsd.es.com> Date: 26 Feb 91 05:24:07 GMT References: <1991Feb25.223133.25064@silma.com> Sender: usenet@dsd.es.com Reply-To: mwatkins@raven.dsd.es.com (Mark Watkins) Distribution: usa Organization: Evans & Sutherland Computer Corp., Salt Lake City, UT Lines: 25 Nntp-Posting-Host: 130.187.91.3 In article <1991Feb25.223133.25064@silma.com>, reddy@silma.com (Reddy) writes: > I have a base surface S(u,v) and an offset surface built on the base surface with an > offset "d". I have all the evaluation points(surface point and all u,v partials) on the > base surface at given parameters. I would like to find out all u,v partials(up to 2nd > order at least !) on the offset surface at the same parameter values. > > > Pointers to any references is appreciated. > > Thanks > Reddy > e_mail - reddy@silma.com -- An excellent source for this is Rida Farouki's paper in the journal CAGD (Computer Aided Geometric Design, 1986, Vol3 Num 1, p 15, where you will find explicit formulae for what you want. Mark Watkins Evans & Sutherland (801) 582-5847 x4573 Salt Lake City, UT 84108 mwatkins@dsd.es.com Brought to you by Super Global Mega Corp .com