Path: utzoo!attcan!uunet!mailrus!uflorida!mephisto!prism!fsu!geomag!prem
From: prem@geomag.fsu.edu (Prem Subrahmanyam)
Newsgroups: comp.graphics
Subject: ray-tracing 3-d quadrics
Message-ID: <526@fsu.scri.fsu.edu>
Date: 2 Mar 90 17:26:04 GMT
Sender: news@fsu.scri.fsu.edu
Reply-To: prem@geomag.gly.fsu.edu (Prem Subrahmanyam)
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Organization: Florida State University Computing Center
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    I've got a question: how many people working on ray-tracers have
    code that supports intersections with 3-d quadric surfaces?  I
    know that QRT supports a limited number of them (no elliptical
    or hyperbolic parabolas).  I've recently implemented in my own
    ray-tracer quadric surfaces that support these as well.  If anyone
    is interested, I can post the source code with explanation as to
    how it's done (it's really quite easy, but if some soul out there
    doesn't want to derive it him/herself, I can post).  
    ---Prem Subrahmanyam