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From: pyle@lll-lcc.UUCP
Newsgroups: comp.graphics
Subject: Scan converting quadric surfaces
Message-ID: <761@lll-lcc.aRpA>
Date: Fri, 10-Apr-87 01:10:53 EST
Article-I.D.: lll-lcc.761
Posted: Fri Apr 10 01:10:53 1987
Date-Received: Sat, 11-Apr-87 13:35:58 EST
Distribution: na
Organization: Lawrence Livermore Labs, Livermore Ca
Lines: 15
Keywords: scan convertion, quadric surfaces


Has anyone scan converted quadric surfaces?  Has anyone done it using the
methods described in "The Algebraic Properties of Homogeneous Second
Order Surfaces", by James Blinn?  My initial problem is that the matrix
describing the quadric surface in screen space becomes very large (or rather)
the numbers within the matrix become very large.  When I try to calculate
the matrix that represents the silhouette curve of the quadric, the 
numbers are so big that it overflows the precision of the machine.  It could
be that I am not calculating my adjoint matrices correctly.  Please drop me
a note if you can.

Thanks,

Ernie Pyle