Sorry, just after posting my reply I realized you are new to POV-Ray and
might not have any idea what those lines with // cmd: are about. You can put
those into the command line field of POV-Ray for Windows 3.5 (I don't use
other platforms/versions) by right-clicking on the words of either line and
selecting Copy "" to command line.

Also, read the scene help about photons, at section 6.10, and eval_pigment,
at section 7.7.3.

P.S. I hadn't actually written that thing for an hour, I spent a lot of that
time trying to figure out that quadric until I just made my own paraboloid
instead.  :-)

Post a reply to this message