[photo-3d] Re: LCS systems

["Wladyslaw Reksc" <wlad@xxxxxxxxxxxxxxxxxx>]

Chris, thanks for the list of your glasses. Which VR-Joy are you using
(there are three models available there)? Unfortunately the VR Standard web
page doesn't provide any technical details. The line-blanker is being
mentioned beside the controller box. Does is also cause the monitor screen
brightness reduction? Does it support page flipping mode? If yes, then how
is it done?

I'm always interested what are the video cards those glasses work the best
with.  My main concern is to find out more about the video cards that
support page flipping mode. Are there any minimum video RAM size
requirements for that? So far I wasn't able to find any of them among most
popular cards on the market. People selling them in the stores don't even
know what I'm talking about when I ask the question. It would be interested
to hear how this mode performs against more popular interlaced mode. Does it
look better (is the image brighter, is the flipping less noticeable) when
those two modes are compared on the same glasses? 

The fastest refresh rate for interlaced mode on the video card I've seen so
far was 85 Hz. This of course causes the flickering to be noticeable. I
guess the synch doubler is the only solution for that. Where do you get that
box?

When it comes to the interlaced mode for i-glasses (and probably many other
glasses using the same software-less concept) I'm surprised to hear that
those systems work on a full frame, not a half frame signaling. From what
Jim writes it becomes obvious why the monitor screen becomes quite darker
when the interlaced mode is selected on the glasses line-blanker switch. My
expectation was that this switch selection would utilize odd/even half
frames signals when the video card is set to the interlaced mode itself. The
hardware interface (also VGA pass through connector) used in Vrex glasses
does it very well without any problems. Obviously separating odd and even
lines is not possible in sequential (or whatever it's called) display mode.
Then every second horizontal scan line needs to be made dark (what perfectly
matched the name of the line-blanker switch). Thanks for that clarification.
I wish it was available directly from the glasses manufacturer.

> ----- Original Message -----
   Date: Wed, 06 Dec 2000 15:50:03 -0500
   From: Jim Crowell <jcrowell@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: LCS systems

The interlaced-format LCS glasses hide the image from the non-viewing eye by
literally blanking alternating scan lines.  So if on one frame you're
looking at the image in the even-numbered lines, then on that frame the
odd-numbered lines are black.  Hence you're losing (on average) half the
light.



Wlad



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