🚀 go-pugleaf

In article <8705200144.AA29716@cogsci.berkeley.edu> 
bryce@COGSCI.BERKELEY.EDU (Bryce Nesbitt) writes:
 >
 >So what you do is prepare two frames. One meant for the left eye and the other
 >for the right.  On veritcal blanking you switch eyes on the glasses and
 >switch images on the screen.
 >
 >This is why they always have these demos in darkened rooms or with some sort
 >of light sheild or dimmer.  The darker it is, the less you notice the 30hz
 >flicker.  In a bright room with bright colors the image flickers a lot.
 >In a very dim room with drab colors the image is solid.  Happy mediums
 >exist in between.

  The lcd shutters switch on and off at, as you mentioned, 30hz.  The
average human eye doesn't detect "flicker" until you get below 25hz.
The problem is not "image flicker" but ambiant room lighting flicker.
The problem with lights has to do with the flicker rate of the lights
themselves heterodyning with the flicker of the glasses.  This is
especialy noticable if you are using the monochrome monitor (which
produces much sharper 3d effects) since it refreshes at 70 hz producing
a both-eye rate of 35hz.  The lcd switching at 35hz and the lights
switching at 30hz produces a noticable 5hz flicker which is the
result of using the lcd glasses and could'nt be improved using any
other <$1500 monitors...

 >
 >There is nothing special about the ST that is suited for use of the device,
 >with a simple interface an Atari 8-bit or Commodore-64, VIC-20, Coleco
 >Adam, TI99/4A, PCjr, Spectrum, Sinclair QL, Amstrad or whatever could drive
 >it.  All a computer needs is some output bits, the ability to check for
 >veritcal blanking and do a page-flip operation on the screen. 
 >High resolution graphics helps, but is not strictly necessary.

  While this is a possibility, the ST is, in fact, a good choice 
because the monitors it uses are very high quality good resolution 
monitors (more important than Bryce seems to think) and because 
the ST has enough spare ram and cpu power to produce stereo-optic 
pictures in a reasonable amount of time.  You could write the
software to just create the images on the machines mentioned, but
after you take enough ram for two (or more) full high rez screen
images, you may not have enough to make a program that would be
useable for more than showing slide-show style pictures...

  Yes, you could use any of the machines mentioned, BUT, there would
probably be major problems using any of them unless you used a very
good monitor.  Since many of them use a long persistance monitor or
tv screens, there could be serious problems trying to get the two 
images to seperate.

--- 
John Stanley (john@viper.UUCP)
Software Consultant - DynaSoft Systems
UUCP: ...{amdahl,ihnp4,rutgers}!{meccts,dayton}!viper!john