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- Path: sparky!uunet!newsgate.watson.ibm.com!news.ans.net!cmcl2!acf5!checker
- From: checker@acf5.NYU.EDU (checker)
- Newsgroups: comp.graphics.visualization
- Subject: Re: Changing controlling stereo real estate (possible?)
- Message-ID: <1882@acf5.NYU.EDU>
- Date: 13 Aug 92 22:01:47 GMT
- References: <BsxIns.LAw@fmsrl7.srl.ford.com> <1992Aug13.204239.23342@infonode.ingr.com>
- Organization: New York University
- Lines: 29
-
- >> To now, we've only seen stereo stuff that takes over the WHOLE screen.
- >> We'd like to just open a Motif window, tho, and have just that be in stereo,
- >> with the rest of the screen viewable through the stereo goggles.
- >> It seems that other real estate is all messed up when the monitor is in
- >> stereo mode.> Basically the way this works is that in stereo mode the whole
- >workstation screen is interlaced with odd lines seen by one eye and
- >even lines the other, but only within the stereo windows are the adjacent
- >raster lines filled with separate left and right view data.
-
- My understanding of the StereoGraphics system is that it uses the
- `over-under' technique to produce the stereo effect. In other words,
- you draw one eye's view on the top half of the screen, the other eye's
- view on the bottom half, and that big box that you plug the goggle
- controller into drives your monitor at twice the verticle refresh rate.
- Each half of the screen is stretched until it covers the whole frame,
- and the goggles flip accordingly. Your vertical resolution is halved,
- but the high refresh rate means no flicker.
-
- Anyway, to address the question at hand: I'm no X windows expert, so I'm
- not sure how you'd pull this off, but the solution is pretty obvious;
- draw the desktop at half the vertical resolution to both the top and
- bottom of the screen. This way when the frame-rate doubler is running
- you'll see the same desktop with both eyes. You'd draw all 2d objects
- identically to the top and bottom, and all 3d objects from different
- viewpoints, as usual.
-
- Chris
-
-
-