Thanks to all for the clarification.
Any human eye objects-models out there?
Michael

"Warp" <war### [at] tagpovrayorg> wrote in message
news:3f36d670@news.povray.org...
> Ken <tyl### [at] pacbellnet> wrote:
> >> A quadric would be a paraboloid, while a lathe would just look like
one.
>
> > If it looks like a duck and it quacks like a duck...
>
>   If it's not a mathematically perfect paraboloid you might get some
> bumps or other unwanted distortions.
>
> --
> #macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb
x]
> [1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
> -1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// -
Warp -

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