"clipka" <nomail@nomail> wrote:

>
> There appear to be different technologies out there, but state of the art
> actually is not horizontal and vertical polarization, but left-handed and
> right-handed circular polarization -- the advantage being that you don't need to
> keep your head exactly level.
>

I was in Las Vegas USA many years ago, and watched a 'special venue' 3D movie
there on a large domed screen. (Some form of IMAX, probably.) I *think* the 3D
glasses I wore were shutter glasses of some sort (but I could be wrong; I don't
remember exactly.) The 3D effect was flawless-- and I was amazed that I could
turn at any angle to look at the imagery, even directly overhead. I assume the
3D glasses were circularly-polarized-- my first experience with that technology.

But when I went to see AVATAR in 3D-Imax at my local big cinema, I remember
tilting my head to see what would happen-- and instead saw two overlapped images
in each eye, with no 3D :-(  The glasses they gave out (on loan!) were simple
polarizers, nothing active. So no circular polarization there, AKAIK.

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