> 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?)
>

Yep! Easy, almost trivial, to do with mesh based geometry, but nearly 
impossible to do with mathematically based geometry.

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