Hi.
I'm probably doing something wrong, but ...

I would assume that if I have two isosurfaces
that are coincident along a line, say the top
of a cylinder oriented along x touching a y plane,
and if I add or subtract the same noise function
to both isosurfaces, say f_noise3d, then the
resulting surfaces would still be coincident
(along a now distorted line).

That's not what I seem to be getting, I have to
multiply the noise by a constant for one of the
surfaces to get it to coincide with the other,
and I have to guess the constant :-(

My code is ugly and a lot more complicated than
I've just described, so it's more than likely
that I've made a mistake somewhere, but I've been
staring at it for over an hour and can't see it.

Any help gratefully recieved. I can post the code
if my question isn't clear.

-- 
Bill Hails

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