doelz@urz.unibas.ch (07/13/90)
Hi all,
I need a stereo device for the power series which gives me an alternative
to stereo view (i.e., a shutter in front of the screen or similar)
which enables me to let < 10 people look at a stereo image without
nneding to spend 45000 SFr. for glasses.
I'd appreciate any hints on source, implementation, and price/performance
issues.
Regards
Reinhard
************************************************************************
Dr. Reinhard Doelz * EAN doelz@urz.unibas.ch
Biocomputing * DECNET 48130::doelz
Biozentrum der Universitaet * X25 psi%46211142::embnet
Klingelbergstrasse 70 * FAX x41 61 256760
CH 4056 Basel * TEL x41 61 253880 ext 888
************************************************************************thant@horus.esd.sgi.com (Thant Tessman) (07/13/90)
In article <1990Jul13.082301.813@urz.unibas.ch>, doelz@urz.unibas.ch writes: > Hi all, > > I need a stereo device for the power series which gives me an alternative > to stereo view (i.e., a shutter in front of the screen or similar) > which enables me to let < 10 people look at a stereo image without > nneding to spend 45000 SFr. for glasses. > > I'd appreciate any hints on source, implementation, and price/performance > issues. > > Regards > Reinhard > StereoGraphics (415 459-4500) sells a thing called (I think) a Z-Screen. It goes over the monitor and circularly polarizes every other frame. The viewer wears passive polarized glasses that look like sunglasses. This is the most economic solution for when you need to show a stereo image to many simultaneous viewers. The Z-Screen (or something like it) can be used with a projection television to create really big stereo images. thant
ronf@tesla.esd.sgi.com (Ron Fischer) (07/14/90)
If color isn't important to you the old Red/Blue glasses would suffice, with two images rendered, one in red, the other blue. Its a cheap old trick, but if your constraint is cost, it will do the job. ronf();
drascic@ecf.utoronto.ca (David Drascic) (07/14/90)
In article <10323@odin.corp.sgi.com> thant@horus.esd.sgi.com (Thant Tessman) writes: >In article <1990Jul13.082301.813@urz.unibas.ch>, doelz@urz.unibas.ch writes: >> Hi all, >> >> I need a stereo device for the power series which gives me an alternative >> to stereo view (i.e., a shutter in front of the screen or similar) >> which enables me to let < 10 people look at a stereo image without >> nneding to spend 45000 SFr. for glasses. >> >> I'd appreciate any hints on source, implementation, and price/performance >> issues. >> >> Regards >> Reinhard >> > >StereoGraphics (415 459-4500) sells a thing called (I think) >a Z-Screen. It goes over the monitor and circularly polarizes >every other frame. The viewer wears passive polarized glasses >that look like sunglasses. This is the most economic solution >for when you need to show a stereo image to many simultaneous >viewers. > >The Z-Screen (or something like it) can be used with a projection >television to create really big stereo images. > >thant Another solution is to use several sets of active shuttering glasses. Given the high cost of the Z-Screen, this might be something you want to consider. A few cheap options are: - Sega sells some for their home video game system at about CAN$70. They are encased in a cheapo housing with dark filters. If you can change the spectacle housing you would probably be alot happier. The driver that comes with these is virtually unusable without the entire game system, so you'd have to build your own. It's not too complicated. - Haitex sells some better ones called XSPECS for the Amiga for about CAN$250. The driver for these glasses has a three connections, one for ground, one for +5V @ 33mA, and the third accepts TTL pulses to switch the glasses from the left-eye-open to the right-eye-open states. It expects a 60Hz switching rate. The limitation with these shuttering glasses is that they are all designed to work at a 60Hz switching rate. At this rate there is some preceivable flicker, but under lower light level conditions, this is not a problem. The Sega glasses can driven by the Haitex driver, which can drive two pairs of glasses. We use our Iris 3120 which has a regular 60Hz monitor to produce stereoscopic graphics. We use automatic colour table swapping to separate the left and the right images. By using some simple electronics to monitor the sync signal to the monitor, we can make the Haitex driver switch the glasses in sync with the colour maps, so that each eye gets only it's own view. The StereoGraphics system typically works at 120Hz, and is pretty expensive. Our homemade system works at 60Hz, but is nice and cheap. Hope this help! David Drascic Dept of Industrial Engineering, University of Toronto drascic@ecf.utoronto.ca -- ^ __ /|\ / \ / | \ | ___ \__ __ | | / /
blbates@AERO4.LARC.NASA.GOV ("Brent L. Bates AAD/TAB MS361 x42854") (07/17/90)
I tried the old Red/Blue glasses trick on our 3130. It was ok, but I believe I had problems with a ghost image from the red in my blue covered eye. Maybe if I had some better filters it would have worked better. (They were only colored overhead transparency film) -- Brent L. Bates NASA-Langley Research Center M.S. 361 Hampton, Virginia 23665-5225 (804) 864-2854 E-mail: blbates@aero4.larc.nasa.gov or blbates@aero2.larc.nasa.gov
mmachlis@athena.mit.edu (Matthew A Machlis) (07/17/90)
Yes, I have tried the red/blue trick as well. As a matter of fact, it worked very well for me. I started with a set of about 100 filter samples from a stage/theater supply company and found the best red/blue filters. About the only problem I had was I had to decrease the brightness of the red image because the blue image looked dimmer. But writemasking turns out to be perfect for creating two images, of different colors, without interfering with each other. If you want I can post the address of the company from which I got the filter set and/or the ID numbers for the filters I ended up using. -- ---------------------------------------------------------------------------- Matt Machlis MIT Space Systems Laboratory (617)253-2272