I still don't quite get why math (and hence POV) 3D coords use
left-hand rule; apart from most people being right-handed, CAD
programs use right-hand, being based on architectural design which
draws a floorplan along the XY plane with Z being the elevation,
which is what you get when you draw a floorplan on a standard
cartesian grid with 0,0 being the origin in the lower-left.

-- 
Tim Cook
http://empyrean.scifi-fantasy.com

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