- using loads of max and

> mins. Also, there are a couple of torii (one at the base and one at the top).

You mean using max and mins to 'and/or' shapes together?
I would be interested in what you have.
I got this far:
 f1 = function { sqrt(x^2 + z^2) - (7 - (y^1.85)/50) }  //convex taper to top
 f2 = function { sqrt(x^2 + z^2) - (7 - 1/(y*y*10)) }    //convex taper to bottom

 f3 = function { sqrt(x^2 + z^2) - (1 + (y^1.5)/100) }   //concave taper to
bottom
 f4 = function { sqrt(x^2 + z^2) - (1 + (1/(y/25*y/25))/2) }  //concave taper to
top

f1 and f2 'and' together nicely but how to get a smooth transition from concave
to convex still eludes me.  Haven't tried splines as iso's yet.  May be something
there will work.  I have this idea of trying to randomly generate typical Morandi
paintings

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