P3D Re: miniaturization

[Robert Thorpe <thorpe@xxxxxxxx>]

Mark Shields wrote:
> 
> (1) When doing crosseyed freeviewing. I've noticed this
> every time I've done it. I get the stereo effect, but the
> image is smaller than it was before I crossed my eyes--
> it almost seems I can't quite reach my eyes out far
> enough to see it properly.

> What is the theory behind this

I have always assumed that, when cross-viewing, your line-
of-sight from the left eye to the right image is the 
hypotenuse of a triangle with the interoccular distance
as the base and the distance to the image as the leg of
the triangle. At close distances the proportion of the
hypotenuse to the leg would be great and the corresponding
miniaturization would be the percentage of the leg to 
the hypotenuse. Sounds good anyway.

======================
Robert Thorpe
Cedar Rapids, IA
thorpe@xxxxxxxx
http://www.skep.com