Wasn't it Warp who wrote:
>nomail@nomail wrote:
>> I wolud like to make a scene with many (about 10000 objects (spheres).
>> Those spheres will be in union like one object: a that object will be in
>> difference with box:
>
>  Slightly beside the point, but be aware that unfortunately that's one
>of the slowest form of CSG in POV-Ray (ie. one of the most pathological
>cases with regard to rendering speed).
>  There are several tricks to work around this speed problem and which
>give the same result, but I don't remember specifics right now.

Read all about the problem, and a couple of tricks for getting round it,
on my pages 
<http://www.econym.demon.co.uk/holetut/index.htm>
<http://www.econym.demon.co.uk/holetut/holes2.htm>

Since you're working with simple shapes (box and sphere), the isosurface
method might code quite nicely.

-- 
Mike Williams
Gentleman of Leisure

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