P3D Re: PSEUDO??

[rdi@xxxxxxxxxxxxxx]

>>What does Pseudo mean in this sense regarding the slide mounting? 

George responds:

>This results in a reversal of stereo depth.
>...If this
>reversal does not contradict with other non-stereoscopic depth cues
>then the brain accepts it, as in the case of computer-generated wire
>models.  If it does contradict strongly then it becomes a total mess
>with the brain being unable to put things in their appropriate 3D
>places and the result is usually confusion and loss of stereo effect.

Quite true.  Let me reinforce that the brain has a hard time with it when you 
are really familiar with the subject, like a person, or a tree 
and grass outside.  Your brain knows that the person MUST be sitting ON 
the grass, and not a person-shaped HOLE in the grass.  If viewew pseudo,
you know *something* is screwed up, but can't figure out why you can't 
make sense of/enjoy the pair.

To make your own good example of a pseudo pair, that will greatly
entertain you and be accepted by your brain, you need to take a shot
of something that you aren't so familiar with.  Something that your
brain won't "know" how it's *supposed* to look.  What I did was
take a close up of the carving on a headstone in a cemetary.  I 
carefully excluded all the background, and filled the frame with
just the stone and carving.  When viewed "properly", you
can clearly see that the letters are carved INTO the stone- recessed.
When viewed pseudoscopically, your brain gleefully accepts that
the letters stand out in RELIEF, sticking OUT of the stone.
Through your life experience, you've seen both types of carvings,
and your brain knows both are possible.

By the way, to see pseudo without remounting the good slide, project it, then
take off your glasses, turn them upside-down and look through them (so you're 
looking through the front of the glasses), - your right eye will then be seeing 
the left view due to the polarization.  Pretty cool, eh?

---
Rick Inzero                                     
Northern Telecom, Inc.      			
Rochester, NY					rdi@xxxxxxx

"...you will never find a more wretched hive of scum and villany..."
					-Obi Wan


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