P3D Re: Large screen 3D alignment (was: IMAX in London)

[Larry Berlin <lberlin@xxxxxxxxx>]

>Date: Tue, 30 Dec 1997
>From: jacob@xxxxxxxxxxxxxx (Gabriel Jacob) writes:
>................
>Andrew Woods writes, .....................
>>I wonder whether IMAX has recommendations of the correct (horizontal) 
>>alignment of the projected image.  I presume they would but two
>>cases (London and Sydney) indicate that maybe they don't or possibly
>>alignment procedures are not being followed.
>
>I'm not sure that the traditional correct horizontal alignment, applies
>to Imax 3D movies. My immediate impression a few years ago while watching
>my first 3D Imax movie The Last Buffalo, was that it was intentional. It
>was the first time that I had ever seen a 3D movie that broke the "window"
>rule so forcefully and well. :-)
>
>The 3D movies of the past that supposedly threw spears at the audience
>never worked very well for me, so seeing Imax 3D accomplish it, was
>a pleasent surprise. Having said that, I do agree it can be tiring, but
>all things considered it's not as bad as it seems. Since the image is
>so large and covers almost the full peripheral vision, it seems, they
>can get away with violating the traditional stereo window.

*****  Well, from comments posted here on P3D, they AREN'T getting away with
it. There are far too many reporting headaches or eye strain, and that is
NOT GOOD. Yes, since the screen is so big the issue regarding placement of
the stereo window is different than other projections where the side of the
window is very much a part of what you see. However, the concept of the
stereo window relates to other factors relative to viewing a stereo image,
and they would do well to reconsider things if this is their official
intended alignment.

Even if you can't see the edges of the projection screen, the depth of the
screen IS the stereo window in a geometric reconstructive point of view for
field sequential viewing systems. To ignore that fundamental physical fact
is to court further headaches and stressed eyes. Sounds like there is room
for improvement through better understanding...

>..................
>So it does seem, they are following, whatever recommendations were set
>forth.
>

So it would seem... :-(

Larry Berlin

Email: lberlin@xxxxxxxxx
http://www.sonic.net/~lberlin/
http://3dzine.simplenet.com/


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