Timothy R. Cook wrote:
> 
> 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.

While working on my modeller I briefly toyed with the idea of
expressing all coordinates in <right,up,forward> and make the
handness an issue for file exporting.  I'm back with left-handed
<x,y,z> code for now.  If it isn't too difficult I'll make the
handedness a user option.

Regards,
John

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