This scene took quite a long time to assemble and tweak--not only because of the
complexity and detail, but because it raised a host of issues and interesting
problems (especially in shapes.inc) that needed to be understood and dealt with.
Whenever I ran into some unexpected POV behavior (or my own POV ignorance!), I
took time to pursue the cause with lots of experimentation. As always, a great
learning experience.

The cave is a HFCylinder macro, very hi-resolution, with inside_vector added
(inside shapes.inc) for CSG.

No radiosity for this scene (yet); rad and photons together have some issues
that I haven't solved.

Comments, criticisms, suggestions all welcome.

For those intrepid souls who want to see some of the changes I made to
shapes.inc., take a look here:

http://news.povray.org/povray.advanced-users/thread/%3Cweb.48e0b5a74b96f64378dcad930%40news.povray.org%3E/

Ken W.

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