Hi Tom,

The simplest is probably 

#declare My_Ripples = function { sin(2*pi*sqrt(sqr(x)+sqr(z))) }
#declare Water_Surface = function { y - 0.2*My_Ripples }

and use function { Water_Surface } in the isosurface.

If you want more sea wave shaped ripples, I find

#declare Water_Surface = function { y - 0.2*abs(My_Ripples(x/2,0,z/2))^N
}

where N is around 6 or so is quite good.

Bye for now,
	Mike Andrews.

Tom Melly wrote:
> 
> Assuming I didn't want to just use an inbuilt function, etc., what would be
> the equation to generate a pattern similiar to ripples in an isosurface?
> (ie. circular waves propagating outwards from a point).
> 
> Ta.

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