On a side note you asked on c.g.r.r. a while back about
the raytracing home page and what had happened to it -
I have found this info for you:
Ray Tracing
The Ray Tracing pages are currently unavailable while their
future disposition is under consideration.
The Department of Computer Science web server is at
http://www.cs.cf.ac.uk/.
--
Ken Tyler
tyl### [at] pacbellnet
net