From: najork@cs.uiuc.edu (Marc Najork) Subject: Re: EPCOT Glasses Date: Tue, 17 Sep 1991 02:49:50 GMT Organization: University of Illinois Dept. of Computer Science In article , joepet@engin.umich.edu (Joe Petrow) writes: > Does anybody know how the glasses at EPCOT Center (used for watching > Captain EO) make images in 3d? They are not like the old red and green eye > glasses I'm used to seeing for this purpose. Also would would I have to do > to create my own 3D images on say, an IBM PS-2? They use polarisation filters. The lens of the left eye is, say, horizontally polarized, the lens of the right eye vertically. The movie is (I assume) projected by two projectors, where the lens of the projector showing the left- eye picture is again horizontally polarized, while the other lens is vertically polarized. As horizontally polarized light (i.e. light which passed through a horizontal- ly oriented polarisation filter) is absorbed by a vertically oriented polari- sation filter, the left eye can only see the picture of the left projector (and analogous for the right eye). -- Marc