Hi Marie,
Do you have special reasons to go with an active system? What programs
do you intend to use for 3d projections?
Since about three years we use a passive system (most likely not
up-to-date anymore) consisting of 2 full-HD projectors (Epson
EB-G5450WU) wall-mounted on top of each other, each having circular
polarized filters in front of the lens (I guess this was
custon-fabricated, but I'm sure commercial solutions exist). We use a
special wall-mounted screen which retains polarization and lots of
passive glasses (light and cheap) with circular polarizing filters
(film). The setup is placed in a lecture hall for about 100 persons, 3d
perception is good from almost all distances and viewing angles, no
significant ghost images (I think the circular polarizing does the trick).
The projectors are connected via HDMI to a dual-port graphics card (low
end NVIDIA QUADRO). The two ports deliver a cloned image, the NVIDIA
graphics driver (Windows 7) "converts" (splits) hardware stereo signals
('quad-buffered stereo') to the two video ports. 3D vision is then
possible for all applications that use 'quad-buffered'/hardware stereo.
It's not directly available in PowerPoint, though! If you want to show
3D movies/images you need an external player (e.g. Stereoscopic Player)
which supports hardware stereo.
One of the drawbacks: the projectors need to be aligned quite accurately
to each other (screen size, focus, image position). Not so conveinient
for manual adjustment of wall-mounted projectors. I'm happy there are no
frequent earth quakes where we live... ;-)
Hope this helps... sorry, if this is a really 'old-fashioned'. I havn't
looked into recent solutions that might exist by now.
Christoph
Hello, Our Department is looking at purchasing a system to project in
stereo for perhaps 50 people in the audience. The current plan is to
go with an active system, although maintaining the glasses will
likely be a problem. If you have insight into currently available
systems that you are either happy with or disappointed in, could you
please send me your advice? Thank you, Marie (Department of
Biological Sciences, University of Calgary)
