Am 27.08.2016 um 18:55 schrieb John Greenwood:
> Can I revive the request for a fillets and rounded corners tool?
> 
> These are standard issue in mechanical CAD packages, so can't be that difficult!

Oh yes, they can!

Internally, mechanical CAD packages typically translate each and every
shape into some single type of boundary representation model (based on
e.g. triangle meshes or NURBS surfaces), and work with those instead of
the underlying primitives.

Once translated to this b-rep model, it is more or less trivial to:

(1) find edges where shapes meet;
(2) describe those edges in a standardized fashion; and
(3) apply modifications to the b-rep geometry, such as rounding a given
edge.

POV-Ray does not go via such a b-rep model, but directly uses the very
fundamental geometric shapes, making /every/ of the above steps
virtually impossible. (Quiz: how would you find the edge between an
isosurface and a sphere? How would you describe it? And how would you
modify the isosurface and sphere to actually generate the rounded edge?)

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