Re:2-D Glasses
by thirdhaf on Wednesday April 20, 2011 @10:39PM
(#2469252)
More than a decade ago I was an IMAX projectionist and I believe that linearly polarized glasses would work. Unfortunately these are circularly polarized.
In this Ohio theater they used a belt and suspenders approach where both polarization and timing were used to create the 3D effect. Left and right eye frames were projected through polarized filters and the projector itself was constructed so that one of the shutters would always be closed while the other was being displayed. The headsets handed out to the audience were active; they had LCD lenses and an IR receiver which would align the timing to the projector's.
This was purportedly done to increase decrease the "crosstalk" between the two eye views and worked quite well.
* Edited to reflect Cushman's observation on circular vs linear polarization.
In this Ohio theater they used a belt and suspenders approach where both polarization and timing were used to create the 3D effect. Left and right eye frames were projected through polarized filters and the projector itself was constructed so that one of the shutters would always be closed while the other was being displayed. The headsets handed out to the audience were active; they had LCD lenses and an IR receiver which would align the timing to the projector's.
This was purportedly done to increase decrease the "crosstalk" between the two eye views and worked quite well.
* Edited to reflect Cushman's observation on circular vs linear polarization.