Among other things, Warp saw fit to write:

>   I don't completely understand
>
http://local.wasp.uwa.edu.au/~pbourke/modelling_rendering/stereopov/offaxis.gif
> 
>   The two arrows on the "eyes" are completely parallel, as if indicating
> that the "eyes" are looking at infinity. However, the fields of view would
> indicate that the "eyes" are actually looking at the center of the
> projection plane. Which one is it?

It may be clearer if you look at this diagram:

http://local.wasp.uwa.edu.au/~pbourke/projection/stereorender/raystereo2.gif

The two "eyes" are looking at two different points, which means their
respective fields of view are not exactly the same, but they overlap in
some region, and it is there where the stereoscopic vision works. The image
you pointed at first is somehow already "cropped" to this overlapping field
(the red line in the second image).

-- 
light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby

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