I think there is no simple answer to this,
have a look at Erich's Packing Centre
http://www.stetson.edu/~efriedma/packing.html
http://www.stetson.edu/~efriedma/cirincir/

or at  Eric's Treasure Trove (not allways available)

http://www.astro.virginia.edu/~eww6n/math/math.html
http://www.astro.virginia.edu/~eww6n/math/CirclePacking.html
http://www.astro.virginia.edu/~eww6n/math/SpherePacking.html


ingo
--
Met dank aan de muze met het glazen oog.
Glen Berry <7no### [at] ezwvcom> heeft geschreven in bericht
<3735bfa0.79587037@news.povray.org>...
>Hello,
>
>I am looking for a procedure to fill a circular area with a collection
>of spheres. I want to be able to specify the radius of the circle and
>the number of spheres to use. The resultant placement should look
>totally uniform. .....

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