P3D Re: non-polarized projection

[Gabriel Jacob <jacob@xxxxxxxxxxxxxx>]

Mark Shields writes,

>It all hinges on at least doing tests and finding that the majority
>of viewers can do cross-eyed viewing at this distance. I'm operating
>on the general assumption that more people can do cross-eyed viewing
>than freeviewing (I am one of those that can more easily do cross-eyes)
>Worth the trouble? Remains to be seen.

There are three ways of freeviewing.
1) Cross, for Right/Left stereo pairs, any size
2) Parallel, for Left/Right stereo pairs, ~2.5" each
3) Diverging, for Left/Right stereo pairs, >2.5" each

Most people tend to have a natural affinity to be able to learn to
freeview by 1) or 2) and with further practice, the opposite mode.

When Left/Right images are larger than ~2.5" (each) they will have
to view them by mode 3). This is an unnatural act and is very hard
for most people to do because the farthest we normally can see is
infinity (in special cases we can see past infinity, check the 
archives) and that entails mode 2). 

We can focus on objects up to a few inches away from us and this
results in being able to converge our eyes much more than we
can diverge our eyes. Thus it is much easier to freeview images
greater than 2.5" by the cross-eyed method.

Therefore for projection the images would have to be freeviewed
cross-eyed. Those that can only freeview parallel, would have to
learn to freeview cross-eyed. 

Gabriel



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