P3D Re: RE: P3D VM virtual viewer

[Gabriel Jacob <jacob@xxxxxxxxxxxxxxxxxxxxxx>]

Eddie writes,
>It appears that people with wide set eyes don't have much problem
>with these viewers.
>Probably the closer set your eyes, the more they have to diverge,
>but I will have to think about that some more.

The problem is, I believe, not that they have to diverge their eyes more
(they actually don't, unless the viewer is not set properly) but because
they can't view the "whole" image properly. This is usually due to too
small diameter lenses. Ferwerda's book clearly explains this granted,
often confusing principle.

For example, a person with 60mm eye separation, would still be parallel
viewing with a viewer that used 20mm diameter lenses and 65mm lens (and
infinity) separation. Granted, they would have a difficult time seeing
the "whole" image, but wouldn't need to diverge their eyes to fuse it.
Solution is simply, larger (albeit more expensive) diameter lenses.

Note, larger diameter lenses will also allow to increase the infinity
points.

NOTE: There can be some factual errors in this message due to it being
past my bedtime and I'm getting very sleepy! ;-)

>Hey, BTW what's a good accurate way to measure your own eye separation?

I remember there was a thread covering this less than a year ago.
I forget the details. Looking in a mirror? Bruce? Anyone!?!

Gabriel