This is my feeble attempt at recreating Henric Wann Jensen's cool "classic
cardioid" caustic pattern (http://www.gk.dtu.du/home/hwj/ and
http://www.gk.dtu.dk/home/hwj/pictures/metalring.jpg) using Nathan Kopp's
Photon Patch for POV-Ray (http://www.nathan.kopp/photons.htm).

The problem with this (did I say feeble) attempt, is that as you can see,
the ray's are almost focused, but not quite. This is simply because the
light source is a skosh too high (as you can also see when you compare the
length of the shadow behind the object with the shadow in HWJ's version.
But... if I try to bring the light up any higher, all of the caustics
disappear.

I've posted the scene file in povray.text.scene-files if anyone would be so
kind to have a look.

By the way, I can see why HWJ used a wood-grain table setting. It really
does bring out the caustic effect. I just grabbed one of the standard wood
textures from the POV includes, but it gives the desired effect.

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