Alain wrote:

> When rendered coincidently, using distinct pigments for the scaled 
> sphere and the isosurface, there was almost no coincident surfaces 
> artefacts, but clearly one or the other pigment visible.

actually, I think this just demonstrates you shouldn't
use a raytracer to prove mathematical theorems ;) As Warp
already mentioned the formula for an ellipse is just that
of a circle with non-uniform scaling applied to x and y,
so mathematically it should be identical. But numerical
solving may overswing in a systematic manner depending
on curvature and whatnot.

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