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