Path: utzoo!utgpu!news-server.csri.toronto.edu!dgp.toronto.edu!stam
Newsgroups: comp.graphics
From: stam@dgp.toronto.edu (Jos Stam)
Subject: Re: Ray Intersection, bspline surface of revolution
Message-ID: <1991May16.123411.406@jarvis.csri.toronto.edu>
References: <1991May16.075304.27436@netcom.COM>
Date: 16 May 91 16:34:11 GMT
Lines: 18

Eric Chet writes:

>     To all raytracing guru's.  I would like to ray trace a surface of
>revolution.  Defined as a bspline curve revolved around axis V.  I
>would like to do this without converting to a mesh.  My question is how 
>do I intersect my ray with a 2D slice of the revolved bspline curve?
>Also the bspline should be defined by N control, points.

Try the following two references:

Kajiya JT, "New Techniques for Ray Tracing Procedurally Defined Objects",
Proc SIGGRAPH '83, 91-102.

Van Wijk JJ, "Ray Tracing Objects defined by sweeping planar cubic splines",
ACM Transactions on Graphics 3(3), 223-237.

good luck,
Jos (stam@dgp.toronto.edu)