Kessells_SR@cc.curtin.edu.au (09/19/90)
Hi, Can someone please tell me where I can find an algorithm for finding the intersection of a ray and a Bezier and/or B-Spline patch. At the moment my Bezier/ray intersection is approximated by aprroximating the Bezier patch with triangles. How accurate is such an approximation? Thanks Paul Vowles ------------------------------------------------------------------------------- Internet: TKESSELLS01@cc.curtin.edu.au ACSnet: TKESSELLS01@cc.cut.oz.au Bitnet: TKESSELLS01%cc.curtin.edu.au@cunyvm.bitnet UUCP: uunet!munnari.oz!cc.curtin.edu.au!TKESSELLS01 -------------------------------------------------------------------------------
spencer@eecs.umich.edu (Spencer W. Thomas) (09/20/90)
In article <3632.26f78d3f@cc.curtin.edu.au> Kessells_SR@cc.curtin.edu.au writes:
Can someone please tell me where I can find an algorithm for
finding the intersection of a ray and a Bezier and/or B-Spline
patch.
You might look at
Lischinski and Gonczarowski, "Improved techniques for ray tracing
parametric surfaces," Visual Computer, Vol 6, No 3, June 1990, pp
134-152.
Besides having an interesting technique, they refer to most of the
other relevant work.
--
=Spencer W. Thomas EECS Dept, U of Michigan, Ann Arbor, MI 48109
spencer@eecs.umich.edu 313-936-2616 (8-6 E[SD]T M-F)