"Slime" <slm### [at] slimelandcom> 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/ ]
>
>

figured it...for reasons beyond my comprehension, all y values actually need
to be (1-y), hence the function is:
#declare fn_water = function {h1 * ( fn_1(x,y,0) * exp( -k * sqrt(x^2 +
(1-y)^2) ) ) }

thanks
jim

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