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Topic: New LG 3D home projector
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Julio Roberto
Jedi Master Film Handler
Posts: 938
From: Madrid, Madrid, Spain
Registered: Oct 2008
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posted 01-19-2010 07:17 PM
It was probably the decoupling of accomodation and convergence.
In non-geek: throughout all your life you have "focused" your eyes to what you were "seeing". If you were looking at something close to your face, you focused on it and crossed your eyes a little to converge on it.
With stereoscopic 3D (any kind of it that's widely used) you converge to "whatever you are watching", say something flying 10 feet off the screen, BUT YOU FOCUS ON THE SCREEN, which is 10 feet "behind".
Now, there is nothing in our biology that stops us from doing this, just that during decades, looking at nature, we have always cued focus and convergence at the same time. Now, they must be separated.
It's like walking all your live one way and all of the sudden someone tells you that you need to clap your hands at the same time you walk. Nothing particularly hard, but unconfortable for a while until you get used to it. Same here. Eventually, if you watch enough stereoscopic 3D, the disconfort becomes lower through excercise.
In movie theaters, the effect is a little less jarring since seating at a distance of say 30 feet or more from the screen, you convergence and focus are pretty much set at "infinity" except for a few special effects way-out-of-the-screen shots. But you watch TV much closer than that, specially in a store where you probably watched it just a few feet away with your eyes in "near-field vision mode".
Now, having said that ....
Repeated Vergence Adaptation Causes the Decline of Visual Functions in Watching Stereoscopic Television -
M. Emoto and T. Niida and F. Okano -
Journal of Display Technology 1 328-340 (2005)
Long story short ... ooooppsss. The 3D (and virtual reality) industries have always worried about that, but since 3D usually meant watching a 90m or shorter presentation every now and then, it was known not to cause any huge or permanent problems to most people.
A different thing would be to watch 4 hours a day of 3D TV. Specially at under 12' distances.
Also:
CNN - Why I can't watch 3D TVBy Rafe Needleman - January 15, 2010
quote:
When it comes to 3D television, I don't see it. Literally. The technology that's supposed to convince me that a 3D image exists when I look at a 2D screen doesn't work for me.
Nor does it work for a small but significant percentage of the population -- 4 percent to 10 percent, depending on which expert you ask. Me, and millions of people like me, are being left behind by content and hardware companies as they move to 3D.
I don't mean to complain. It's not the end of the world. Flat-viewers, like me, can watch 2D versions of 3D content. I saw "Avatar" in the non-3D version. As a bonus, the theater was nearly empty--the 3D showing down the hall was more crowded. Plus, we didn't have to wear those dorky glasses.
The industry has always known this and factors that 10% of the general population doesn't like/doesn't enjoy/can't even see stereoscopic 3D.
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Frank Angel
Film God
Posts: 5305
From: Brooklyn NY USA
Registered: Dec 1999
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posted 01-28-2010 07:26 AM
quote:
Plus, we didn't have to wear those dorky glasses
Puh-leeeze. Perhaps it's not the glasses that are "dorky," but the dork who is wearing them. I am just so tired of this whine -don't these guys wear SUNglasses all day at the beach? Do they piss and moan about them?. I was enthralled with anything 3D -- I use to hold up the ViewMaster thing to my face for hours & no one every heard me complain; talk about dorky glasses.
By the way, that quote is by Rafe Needleman, quoted in Julio's post; Julio, you KNOW I am not calling you a dork. Just I don't know were the system puts in the name of poster. I don't see it in there in Preview, but it seems to show up in the actual post. If it does the same here, apologies in advance.
BTW, that disparity between the focal point and the eyes' convergence point, yes that can be odd at first, but our brain is marvelous at correcting for those kinds of anomalies. Watch a few 3D movies and most people should be able to deal with the unnatural thing the eyes are doing. In the real of the marvelous feats the eye/brain combo accomplish, readjusting for the disparity should be a piece of cake for most people, even within the course of a single movie. Imagine once we watch 3D regularly.
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