On 2/14/06, Alexandre Quessy <listes@sourcelibre.com> wrote:

Mathieu Bouchard a écrit :

>
>Whatever the units are in the 3-D space, they cancel out with the
>flattening: meters/meter, cubits/cubit, inches/inch, all those are
>non-units. This is because a point in 3-D space (x,y,z) becomes
>(k*x/z,k*y/z). The constant "k" can be imagined to be in whichever units
>you want, but in GEM it tends to be some fraction of the window's size in
>pixels.
>
>
>

The constant k is ... well, 4 is the width (or height, I forget) of the
Gem window.

aalex

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