Article View: comp.lang.pascal.borland
Article #25Re: 3d programming
From: Paul Rowntree
Date: Mon, 12 Feb 1996 20:01
Date: Mon, 12 Feb 1996 20:01
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Christopher H. Clark wrote: > > Jonathan Cohen wrote: > > > > In article <3118310E.52F@psu.edu>, Christopher H. Clark <chc104@psu.edu> wrote: > > >Actually, you only need 2 points to define a plane: a point on the plane and > > >a normal vector. > > > > Sorry to quibble, but... > > > > A VECTOR IS NOT A POINT!!!! > > > > Now back to our regular program. > > Points are vectors. > ^^^^^^^^^^^^^^^^^^ Sorry, but I must take offense here. A point in Cartesian space has three aspects [X,Y,Z]. A vector requires a direction, and depending on how sticky you are, probably a length. This implies 6 independent aspects. Result; A plane requires 3 points. Always. Cheers
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Path: arc1-ca.pugleaf.net!news.si.usherb.ca!usenet From: Paul Rowntree <rowntree@structure.chimie.usherb.ca> Newsgroups: comp.lang.pascal.borland,comp.lang.pascal.mac,comp.lang.pascal.ansi-iso,comp.lang.pascal.misc,comp.sys.amiga.programmer,comp.graphics.algorithms,comp.os.ms-windows.programmer.graphics,comp.sys.amiga.graphics Subject: Re: 3d programming Date: Mon, 12 Feb 1996 12:01:08 -0800 Organization: Universite de Sherbrooke Message-ID: <311F9C84.3B26@structure.chimie.usherb.ca> References: <4f3od9$2jg@zeus.tcp.co.uk> <jderrick-0502961551360001@slip037.csc.cuhk.hk> <3118310E.52F@psu.edu> <4fiuh2$qrj@fulton.cs.unc.edu> <311E38D7.71BC@psu.edu> NNTP-Posting-Host: tree_pc.chimie.usherb.ca Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Mailer: Mozilla 2.0 (Win16; I)