Implemented greenmagenta stereo; installers available for
Windows/Linux/Unix/MacOSX. Rob Salgado reported that LCD projectors
polarize green horizontally (horizontal electric field) and red and blue
vertically. This greenmagenta mode therefore may be useful for LCD
projection with passive polarizing glasses oriented to pass horizontal
electric field to the left eye and vertical electric field to the right
eye. (But note that often polarizing stereo glasses pass electric field
at 45 and 135 degrees, not 0 and 90 degrees.)
I experimented a bit with an LCD projector, but I was handicapped by not
having a screen that preserves polarization; the best I could do for the
moment was use a sheet of aluminum foil. Also, I'm not sure how good my
polaroids are, nor how well polarized the LCD projector light really is.
There's definitely a strong polarization of the green vs. the red and
magenta, but under the poorly controlled circumstances of the test the
ghosts were about as bad as with the simpler redcyan, which doesn't
require a special screen.
In passing I note that ghosts in the redcyan projection were less
noticeable with the room lights on. The ghosts are after all rather
faint, and they tended to wash out with the room lights on.
Bruce Sherwood
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