"Ray Tracing Creations," Wells and Young; Waite Group Press; ISBN
1-878739-27-1: $39.95 US.
"Ray-Tracing Worlds With Pov-Ray" Enzmann, Krezschmar, and Young; Waite
Group Press; ISBN 1-878739-64-6 : $44.95 US.
Both may be out of print, but I have heard of the later on shelves
recently. If you can order one, order Ray-Tracing Worlds (my opinion).
--
Paul Hinds
gri### [at] swbellnet
net