In article <3EA### [at] matumde>, Achill <ach### [at] matumde> 
wrote:

> I saw on http://www.f-lohmueller.de/pov_tut/csg/povcsg1e.htm that CSG 
> operations may be used with all shapes which have a clear defined 
> "inside" and "outside", in particular with solids. My idea was that it 
> should be possible to determine "inside" and "outside" of the sum (at 
> least for the sum of solids) as well...?!?
> 
> I must admit, I do not know how povray "knows" to distiguish "inside" 
> and "outside".

It can check whether a given point is inside or outside the object, 
using a hard-coded object-specific algorithm. How does that help? It 
doesn't get you any closer to summing objects.

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/

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