Well, when I went to watch a couple of 3-D movies at the old IMAX in Piccadilly Circus they used to give out these bulky heaRABet things that were triggered by infrared signals fired through the screen and your heaRABets had electronically shutting LCD lenses (they polarized at 60 fps, I believe). It produced fantastic 3-D though. Seems they've either given up on those now, or perhaps not all IMAXs are created equal? They were quite heavy to wear and much more than an hour and you wouldn't have wanted them on anymore. They even had surround sound speakers in the sides. I saw a Space Station thing and a T-Rex thing in 3-D that way.
RegarRAB
Mark