From: ee91ajh@brunel.ac.uk (Adam J Holt)
Subject: Re: 1-eyed 3D
Date: 5 Dec 91 12:15:54 GMT
Organization: Brunel University, Uxbridge, UK



I recently posted this question to the news-group:

>Does anybody know anything about the (seemingly new) idea of 3D using a single
>filter over one eye.  It seems to be similar to the polaroid method used in 
>thecinema but I realise that method couldn't be easily implemented on a
>conventional TV/monitor.

I have had a couple of replies to this so far.

Lance Norskog (motcsd!lance@apple.com) writes:

"It's called the Pulfrich Effect.  A dark lens over you eye sets
up a delay line so what the eye sees is judged to be later data.
So, one lens over the right eye means that motion from left to
right is misperceived."

Vance Bass (bass@cs.utk.edu) writes:

"You inquire about the use of a dark filter over one eye to give a 3-D
effect.  This is referred to as the Pulfrich technique and is VERY limited.
For starters, it only works when the motion goes one way (depends upon
which eye the filter is over) and ONLY works when there is horizontal motion.
No motion, no three-dimensionality.

There's a 3-D mailing list on the BITNET.  Let me know if you want the 
address."

Many thanks Lance and Vance (coincidence?) for the info.  From what Vance says
it looks like there isn't a great potential for this effect in VR.  However I
would still like to know if anybody has seen this technique put to good effect.

Thanks.

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*  AAA   DDD    AAA   M    M                                                  *
* A   A  D  D  A   A  MM  MM   Name: Adam J Holt                              *
* AAAAA  D  D  AAAAA  M MM M   Subject: Microelectronics Systems Design       *
* A   A  D  D  A   A  M    M   Establishment: Brunel University, London       *
* A   A  DDD   A   A  M    M   Janet email: ee91ajh@brunel.ac.uk              *
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