Path: utzoo!mnetor!uunet!lll-winken!lll-lcc!ames!mailrus!nrl-cmf!cmcl2!brl-adm!umd5!uvaarpa!mcnc!duke!thorin!unc!turner
From: turner@unc.cs.unc.edu (Douglass Turner)
Newsgroups: comp.graphics
Subject: intersecting a quartic (ie., torus)
Message-ID: <1547@thorin.cs.unc.edu>
Date: 3 Mar 88 18:50:52 GMT
Sender: news@thorin.cs.unc.edu
Lines: 7
Keywords: ray tracing, quartic surfaces

I'd like to include torii (and possibly other quartics I'm 
unaware of) in the set of primitives I ray trace. Can anyone
tell me how to throw a ray at a quartic? 

Algorithm description, pseudo-code, actual code, 
or all of the above would be ideal.

Thanks in advance.