Mick Hazelgrove wrote:
> 
> Has anyone tried this, any tips, code or help gratefully received.
> 

Have you looked Christoph Hormann's tutorials?
http://www.schunter.etc.tu-bs.de/~chris/raytracing.html

Some sort of light fading is one thing to add (either with fade_distance &
fade_colour or media). Another is variable reflection, in combination with
conserve_energy, which makes the water more reflective & less transparent at
shallow angles (I am of course assuming you use MegaPOV)

-- 
Margus Ramst

Personal e-mail: mar### [at] peakeduee
TAG (Team Assistance Group) e-mail: mar### [at] tagpovrayorg

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