The problem will probably be corrected if you increase the 'autostop' angle.
Set it to 45 (degrees) and things should work.  Soon I'll have a FAQ that
explains this.

-Nathan

David Cook wrote:
> 
> 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.
> 
>  [Image]

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