>   'right-handed' is just a convention, often used math teachers,
> to make it easier to talk about how axes are orientated and how
> angles turn. (later they tell us, that electrons are left-handed :-))
> POV-Ray is able to do also very inconventional things.
> That's very good!
>
> Friedrich
>
>
>
>

In my math classes when looking at geometry, we only used the 
left-handed coordinate and rotation system. Also, Y was always UP and Z 
forward, NEVER relative to the paper's surface.

It was the same in my physics courses.

The right-handed system is mostly used by architecs, and, as most early 
modeling applications where made for architecs, it stuck. It's also why 
we have the infamous Z for the up direction. Architecs use the X and Y 
axis along the ground and on paper where +X is right and +Y is the top 
of the paper.

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