Lark wrote:
> ... But what I really want the lense for is to split up a
> beam of light. ...

People are working on this.  

There's a macro by Margus Ramst in  povray.text.scene-files, with an
example in povray.binaries.images. 

Peter Popov made an image title "The Spectral Orb", which also uses
color dispersion, in povray.binaries.images.  Scene source code is
available - at first I thought he used fake caustics, but no, it's done
with a bunch of light sources.  (Maybe this image should be the official
logo for the next POV-Ray?)

Nathan Kopp is patching POV-Ray itself to add caustics using an
algorithm called photon mapping, and has impressive results, though he
refers to his work as "vaporware, but this is a pretty thick vapor",
because it's not finished, has bugs.  Watch for his name in the
newsgroups.  See his images in povray.binaries.images.     When he
releases this, it ought to be faster and better than any macros (we all
hope).



-- 
Daren Scot Wilson
dar### [at] pipelinecom 
www.newcolor.com
----
"A ship in a harbor is safe, but that is not what ships are built for"
                                            -- William Shedd

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