>   Unfortunately, I don't think there is any easy solution for the general
> case.

Maybe someone can help me with my math, then.

I have a sphere scaled to <40, 54, 9.2>.  I wanted to place a row of 
holes along a parabolic surface that would match the curve of the elipse 
in the XY plane.

I came up with f(x) = 0.04909(27.5-x)^2+37.125, which produces a 
parabola that matches the x and y intercepts, but the sides are too flat.

I think if I could find a point that wasn't an intercept, I could come 
up with a better parabolic model, but I don't know how to do that, short 
of (extensive) trail and error.

Suggestions?  Anyone?

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