> I see now that creating rounds as cgs objects is difficult and inelegant. To
> find an elegant solution one must adopt the point of view of a ray.
>
> I have had some thoughts which I am posting on a new thread: rounded_objects: a
> new object?"
>
>

You can find some for specific cases that already exist. There are some 
macros to make rounded cylinders, cones and boxes in shapes.inc.
There are some cases that can be made with isosurfaces, look at the 
blobbing functions.
But all those are quite limited in scope and functionality.

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