I figured out how to do this, if anyone is interested. The angle is
indirectly related: the direction vector's *length* is equal to the
distance to the second point, and therefor to the ideal location of the
viewers eye. This makes sense: your eye is placed in the same place as the
camera, in relation to the image plane. I am going to attempt to write a
macro that gives similar ideal viewing location for different size images,
if anyone is interested. The trade-off here is distortion vs. depth. In the
ideal location you wont see any distortion, but the further that location
is from the image plane, the less depth is recorded. Any comments or help
would be great.

-S
5TF!

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