Neil Kolban <kol### [at] kolbancom> wrote:
> I consider myself a bit of a newbie ... but wouldn't a regular torus 
> followed by a scale in some direction now do what you want?

  That wouldn't keep the minor radius constant.

  I suppose that if you want an elliptical torus with the minor radius
constant, you'll need to write a 5th or 6th order polynomial (either
with poly or isosurface). I'm too lazy right now to even try to start
guessing the proper formula.
  Of course another way is to cheat and create a mesh instead using
a nested loop.

-- 
#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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