"Nicolas George" <nicolas$george@salle-s.org> wrote in message 
news:498c0906@news.povray.org...
> "stevenvh"  wrote in message
> <web.498adc8f39783190c0721a1d0@news.povray.org>:
>>> In fact, if the radius is less than sqrt(2), there is no "cavity" at 
>>> all,
>>> since the spheres on the diagonal of a face do not intersect.
>> Well, they do intersect,
>
> The ones on diagonally opposed vertices do not.
>
>>    but they "cavity" isn't a closed volume, i.e. it's open
>> to the six sides of the cube.
>
> Which is not a cavity in the proper sense.

We're veering off onto semantics, but I'd say that an open cavity is equally 
proper.
A lot of cavities in teeth for example are open cavities.

Chris B.

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