I don't know, but I imagine that each call to the isosurface during
calculation of reflection, refraction, finish, radiosity, lightsources - all
causes the isosurface to be evaluated again and again.. Similar with
primitives, but even the fastest isosurface is much slower than a primitive,
hence the big slowdown.. This is my theory - not necessarily the fact.. IF
it works like that, then I have to say, a much better idea would be to
calculate the surface *first* once and for all, and *then* do all the rest
of calculations.

Regards,
Hugo

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