Path: utzoo!mnetor!uunet!husc6!think!ames!ptsfa!well!ewhac
From: ewhac@well.UUCP (Leo 'Bols Ewhac' Schwab)
Newsgroups: comp.graphics
Subject: Re: Interactive Stereo Viewing
Message-ID: <5276@well.UUCP>
Date: 21 Feb 88 22:04:02 GMT
References: <4615@tut.cis.ohio-state.edu> <146@rocky8.rockefeller.edu> <5039@well.UUCP> <301@lamont.Columbia.edu> <56@torch.UUCP>
Reply-To: ewhac@well.UUCP (Leo 'Bols Ewhac' Schwab)
Organization: "Hip! Hip! Hooray!  We're orphans!"
Lines: 27

In article <56@torch.UUCP> paul@torch.UUCP (Paul Andrews) writes:
>There is a program for the Atari personal computer called Cad-3D 2 from 
>a company called Antic. This uses interlaced polarised stereo glasses.
>				   ^^^^^^^^^^ ?
	That's all well and good, except that the ST can't do interlace
video.  (It can't do overscan video 'neither.)

	The ST uses the same type of glasses that I've been developing for
on the Amiga.  They are electrically active occluding LCD glasses.  On a
signal from the computer, one of the lenses turns opaque, leaving the other
lens clear.  The computer holds the glasses in this state while the video
beam paints the appropriate picture (left or right eye image) on the screen.
When the video field is completed, the computer inverts the state of the
glasses, and displays the "other" image.  This synchronized dance is
repeated for every video field, and the user perceives stereo 3D.

	There are limitations to this approach, which are primarily flicker
and cross-ghosting (a ghost of the left image is visible to the right eye,
and vice-versa).  This problem can be substantially alleviated by placing
neutral grey filters over the lenses, avoiding direct ambient light on the
screen, and sitting in a darkened room.

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Leo L. Schwab -- The Guy in The Cape	ihnp4!ptsfa -\
 \_ -_		Recumbent Bikes:	      dual ---> !{well,unicom}!ewhac
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