Re: Stereo Window - Poll time!

[P3D Gregory J. Wageman <gjw@xxxxxxxxxx>]

I wrote:

>>I maintain that your eyes' convergence is determined by aligning
>>the  window.  Once you've converged to align the window's vertical
>>edges, moving the chips doesn't reconverge your eyes, it only changes
>the disparity in the scene relative to the window.  

George responded:

>I admit I am a bit lost here Greg... Doesn't your eye's convergence
>change as you scan the scene?  If the infinity points are separated
>by 2 1/2 in. in the screen, don't your eyes look parallel as if the
>are looking at real infinity?  If you bring the chips closer (without
>adjusting the projector) won't the infinity separation be decreased?
>Won't that change your eyes convergenece when they are pointed to
>(scene) infinity?  What you are saying?

If you were converged on infinity when adjusting the window then
yes, your convergence would change.  But aren't you typically going
to be converged *at the window plane* while doing this, in order to
observe when you've brought that rock close enough (or pushed it
back far enough)?  I know that's what I do.  If I converged on
infinity, the window edge would go double as the chips moved and I
wouldn't be able to tell where it was anymore.

Granted, I also tend to do this while freeviewing the pair in a mount,
so no magnification is involved and the total convergence change is much
smaller (a few millimeteres at most).

Do you actually set window while projecting, or is this a hypthetical?

	-Greg W.


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