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From: trainor@CS.UCLA.EDU
Newsgroups: comp.graphics
Subject: Re: ray tracing (Was Amiga ray tracer)
Message-ID: <5809@shemp.UCLA.EDU>
Date: Fri, 1-May-87 21:36:19 EDT
Article-I.D.: shemp.5809
Posted: Fri May  1 21:36:19 1987
Date-Received: Sun, 3-May-87 02:05:54 EDT
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In article <823@osu-cgrg.UUCP> spencer@osu-cgrg.UUCP (Steve Spencer) writes:
>In general, all of these methods greatly reduce the time spent by
>ray-tracing programs, because you don't have to do ALL THOSE 
>INTERSECTION CALCULATIONS !!!!!

Forget about intersection calculations, it's just trying to reduce the
problem of determining which object goes with a given ray to logarithmic
time, instead of linear.  The actual intersections only amount to a
constant, although it's a whopper...

	Douglas