In article <3a2d819b$1@news.povray.org>, "Randolph Robnett" 
<rro### [at] midwestnet> wrote:

> Any ideas about making water look as though it is funneling or 
> spiralling as in a whirlpool. The trick is that it needs to be 
> 3-dimensional and not just look 3D. Any suggestons would be 
> appreciated.

There was a thread a while ago about doing this with isosurfaces...in 
povray.unofficial.patches, I think, but I couldn't find the exact thread.
The code I came up with in that thread could still be improved, but here 
it is:

#declare Vortex =
function {
    y+(1/(sqr(x)+sqr(z)+0.3))
    +sin(atan2(x,z)*7 + y*10)*0.025
}

isosurface {
    function {Vortex(x,y,z)}
    threshold 0
    eval
    max_gradient 4
    contained_by {box {<-5,-5,-5>, < 5, 1, 5>}}
    pigment {color rgb < 0.5, 0.85, 1>}
}

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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