> Well, that makes sense then, and reinforces my original idea that the
cause of
> my particular odd blurring was that my look_at and my focal_point were two
> different vectors. If they are the same, this imaginary "sphere" around
the
> camera will intersect at one point, i.e. where look_at/focal_point
coincide. If
> they are different, there should be an arc shaped ring between the f_p,
and the
> l_a, which is exactly what I experienced.

Hmm? No, the look_at point has *absolutely nothing* to do with focal blur.
If you have a focal point 2 units away from the camera, and a look_at point
2000 units away from the camera, then everything 2 units away from the
camera will be in focus.

The arc is caused by the intersection of the surface of the sphere with the
surface of the plane.

 - Slime
[ http://www.slimeland.com/ ]

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