Geoff Wedig wrote:

> Well, I've been considering a whirlpool.  If I can work out an iso funtion,
> I'll do it.

This should come close -

#declare Vortex = function{1/((x^2)+(z^2)+0.3)+sin(atan2(x,z)*7+y*10)*0.025}
                  
#declare Vortex1 =
isosurface {
            function {y+Vortex(x,-y,z)}
            threshold 0
            accuracy 0.00001
            max_gradient 3.9
            contained_by {box {<-5,-4.99,-5>, < 5, 0.01, 5>}}
           }

-- 
Ken Tyler

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