In article <slr### [at] tealhhjpat>, 
hjp### [at] SiKituwsracat (Peter J. Holzer) wrote:

> >Well, what does it mean?
> 
>     intersection {
> 	sphere { ... }
> 	plane { ... }
>     }

Indenting from the right side? Interesting...
A half-sphere is a hemisphere...there may be a separate term for cases 
where the plane surface doesn't pass through the center of the sphere.


> Now think of a CSG composed of an arbitrary number of objects. Coding
> all possible combinations would be clearly infeasible. 

CSG is probably the biggest problem with tesselation...once you get past 
the memory use, that is. :-)

-- 
Christopher James Huff - Personal e-mail: chr### [at] maccom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://homepage.mac.com/chrishuff/
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