Congratulations to Katsuaki Hiramitsu, winner of the RenderMan newsgroup
"Post of the Year" award for 2004. His analysis of normalizing Sobel's
differential operator was judged to be the most helpful to someone writing
a renderer of all the articles posted on this newsgroup last year. The
inequality algebra at the end was particularly insightful. See Katsu's
winning article along with those of past winners at:
http://www.dotcsw.com/links.html#forums
It had been five years since Katsu's last post to this newsgroup (which
also included his trademark "sorry for my poor English" disclaimer.)
Rick LaMont
Dot C Software, Inc.
http://www.dotcsw.com/