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.

-- 
Christopher James Huff <chr### [at] maccom>
POV-Ray TAG e-mail: chr### [at] tagpovrayorg
TAG web site: http://tag.povray.org/

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