If you change the camera location but don't
change the look_at it will rotate the camera
and introduce "keystone" distortion. In the
real world our eyes do rotate (converge) when
we look at something close, and our perceptual
system (brain) compensates for the distortion.
Unfortunately, when we view stereo images our
viewing methods can't recreate this convergence
and as a result we see distortion. To avoid this
stereo pairs should be created with parallel
cameras.

The rare exception to keeping the cameras
parallel this is in electron microscopy where
the object itself is rotated. The resulting image
doen't have noticeable keystone distortion
because of the shallow depth of field.

Harolddd



Warp said:

>   Unrelated to the question in itself, but AFAIK the most accurate way
> of getting a stereo image pair is precisely changing the location of the
> camera while keeping the look_at where the camera is "looking at".
>   This simulates what happens with your eyes and thus is the most correct
> simulation of a stereo image.

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