Path: utzoo!attcan!uunet!munnari.oz.au!uhccux!ames!sgi!shinobu!odin!victoria.esd.sgi.com!robert
From: robert@victoria.esd.sgi.com (Robert Skinner)
Newsgroups: comp.graphics
Subject: Re: 4D Ray Tracing
Message-ID: <3704@odin.SGI.COM>
Date: 7 Feb 90 16:28:06 GMT
References: <11899@thorin.cs.unc.edu>
Sender: news@odin.SGI.COM
Reply-To: robert@sgi.com
Organization: Silicon Graphics Inc., Entry Systems Division
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In article <11899@thorin.cs.unc.edu>, hill@alanine.cs.unc.edu (Curtis
Hill) writes:
> In article <14039@s.ms.uky.edu> sean@ms.uky.edu (Sean Casey) writes:
> >So, anyone given some thought toward 4D raytracing???? Hmmmm? :-)
> 
> Glassner, Andrew, Spacetime Ray Tracing for Animation, IEEE Computer 
> Graphics and Applications, March 1988, pp. 60-70.
> 
> Joe Bob says check it out.

This doesn't really answer his question though.  I assumed Sean meant
static 4D objects, whereas Glassner just added time as the fourth 
dimension to do animation.  Of course, Glassner said he just changed a 
#define for the length of the vector from 3 to 4 and it all worked, 
so that is at least encouraging.

Robert Skinner
robert@sgi.com

		Which is worse, ignorance or apathy?
		Who knows?  Who cares?