Path: utzoo!attcan!uunet!cs.utexas.edu!csd4.csd.uwm.edu!mrsvr.UUCP!shoreland.uucp!hallett From: hallett@shoreland.uucp (Jeff Hallett x4-6328) Newsgroups: comp.graphics Subject: Re: Tangents to Three Circles Keywords: Appolonius Message-ID: <894@mrsvr.UUCP> Date: 17 Aug 89 20:11:35 GMT References: <859@mrsvr.UUCP> <4630@eos.UUCP> <13068@well.UUCP> Sender: news@mrsvr.UUCP Reply-To: hallett@shoreland.UUCP (Jeff Hallett x4-6328) Organization: GE Medical Systems, Milwaukee, WI Lines: 27 In article <13068@well.UUCP> nagle@well.UUCP (John Nagle) writes: > > In classical geometry, this is called the Problem of Appolonius. >There is a compass-and-straightedge solution to this problem, not that >many people care any more. I most certainly care - that is why I posted in the first place. If you could post it, I would appreciate it. > > AutoCAD has a solution to this problem built into it. The solution >used in AutoCAD was new, and had good numerical stability without special >casing. It was developed by Autodesk's staff topologist, and, as far as I >know, has not been published. > How is it invoked? Thanks. -- Jeffrey A. Hallett, PET Software Engineering GE Medical Systems, W641, PO Box 414 Milwaukee, WI 53201 (414) 548-5173 : EMAIL - hallett@postron.gemed.ge.com