Many a discovery it seems can be made in one evening. I have been playing around
with the little rainbow creating setup i have here and have discovered many
interesting things.

Firstly I have overcome an initial curiosity that things only worked with
caustics on. Still not entirely sure what the quirk was here but whatever it
was it is sorted and caustics are as stated by everyone here unnecesary.

A second point of interest worth mentioning is that pov ray will not split a
single white light source by any method that I can find. However if one creates
a whole set of coloured light sources at the same point then this equates to
white on normal surfaces however povray wil differentially split this light to
produce a beautiful spectrum.

A third discovery is that a large dispersion is required otherwise one will
mainly see white as the colours are not being seperated enough.

A fourth note which I need to solve is that I am still not quite producing a
glory as the camera is pointing at a screen which is showing the spectrum. in
other words I cannot get the 'water' to show up the glory, I can only see the
image that it projects onto a screen.

Please enjoy the attached image and ask about anything of interest.

Malcolm

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