"Tim Cook" <z99### [at] bellsouthnet> schreef in bericht 
news:44ee275f$1@news.povray.org...
>
> It's the difference between whether you're introduced to 3D via CAD or via 
> 'math'.  Architectural design uses XY as the floorplan plane, so Z becomes 
> up, while math uses cartesian coordinates XY as relative to view-plane. 
> Clearly, the architectural method is superior, (wink) as it isn't 
> dependent on individual point of view.
>
Indeed. And then you have also those systems with Y up, but left- (POV-Ray) 
or right-handed (Wings3D, Silo). Does not matter much, but sometimes you 
have to remember that.

Thomas

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