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Thanks, but that doesn't seem to work - it just produces the same result as
before.
Anyway I can see now that the value is dependant on the "overall" distance
so I'll keep experimenting...
Thanks
Jim
"Slime" <slm### [at] slimeland com> wrote in message
news:3ce03d2f$1@news.povray.org...
> Change
>
> #declare fn_water = function { h1*( fn_1(x,y,0)*exp(-k*x) ) }
>
> to
>
> #declare fn_water = function { h1*( fn_1(x,y,0)*exp(-k*sqrt(x^2+y^2)) ) }
>
> And the exponential falloff will be dependant on the overall distance from
> the origin, rather than just the distance along the x axis.
>
> - Slime
> [ http://www.slimeland.com/ ]
>
>
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