OK, now I understand that you're speaking about curvature and not
smoothness!

I didn't know that a change in curvature, in smooth surfaces, could be
easily detected in shading.

Pity I couldn't help...

Fernando.

"Christopher James Huff" <chr### [at] maccom> wrote in message
news:chr### [at] netplexaussieorg...
> In article <3c82f3e2@news.povray.org>,

>
> > I don't see why the union of a cylinder and a torus doesn't meet your
> > requirements. If I'm not mistaken, the derivatives of the surfaces of
the
> > cylinder and the torus (if done correctly) should be equal at the
> > intersection, so there shouldn't be any abrupt changes in the smoothness
of
> > both surfaces.
>
> But the derivative of the derivative is discontinuous there...the rate
> of change in curvature changes abruptly. It transitions from an almost
> constantly curving surface to a completely flat surface. This change is
> easy to see in the shading.

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