Christopher James Huff wrote:
> 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.
> 

Knowing now that inside and outside are determined by an individual 
"hard-coded" algorithm, I see why there is propably no way (at least 
none I can think of) to write a general sum for objects.

Thank you very much for your patience and helpful explanations.

Achill

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