Re: correction

[P3D Jim Crowell <crowell@xxxxxxxxxxxxxxxxx>]

At 7:35 PM 6/7/96, P3D Gregory J. Wageman wrote:

>Allan Woods writes:
>
>>Sorry, I said when viewing projected steroe slides our eyes were always
>>converged on the surface of the screen - not true.  They are converged
>>wherever they need to be to make the images fuse.
>
>OK, good.  If what you originally said were true, the system wouldn't
>work, because the convergence/divergence is the primary depth cue.
>

No, that's the binocular disparity.  You don't actually need to
make the eye movements to see the depth, they just let you move
your most sensitive region around.

Convergence angle can have some effect on the perceived overall
scale of the view, i.e. if you slide the two halves sideways
towards your nose the whole scene may start to look smaller.

-Jim C.


------------------------------------------------
Jim Crowell
School of Optometry
360 Minor Hall
University of California
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