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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