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Topic: Glasses-free 3-D...how would it be possible?
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Julio Roberto
Jedi Master Film Handler
Posts: 938
From: Madrid, Madrid, Spain
Registered: Oct 2008
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posted 04-15-2010 07:14 PM
Of course, there have been TONS of glasses-free 3D systems throughout the years.
Some even used in extensive commercial theatrical movie engagements. There were theaters in Russia that regularly showed glasses-free stereoscopic 3D films during the 60's-80's using the barrier screen developed by their Cinema and Photo Research Institute (NIKFI).
But the short answer is: for STEREOSCOPIC (as oppossed to multiscopic or wavefront reconstructions, like holography) it can't be done.
The medium answer is: it can be done, but with restrictions and sucky results.
The longer answer is: it can be done OK if only one person is looking at the "screen", but with restrictions (or suckiness or both) if shown to more than one person at the time.
This is for PHYSICS reasons. Since nature's laws can't be easily and cheaply broken, if ever at all, the hurdles have not been overcame in 100 years of 3D image research and they are not expected to.
You can do DIFFERENT, usually much more expensive and convoluted ways to obtains a result that would be a "very good full-color moving image of quality similar to current 2D display systems" but in 3D and to a large audience. But it will not be a matter of simply shooting a movie with two cameras and combining two images in a "simple screen". At all.
Think about it. If you don't have anything in front of your eyes to filter out the light coming to them from the "wrong image" ... how are you going to direct light through space so that, no matter where your head is in space, only the "right light" will hit the right eye and not the left one for a large audience?
It's just not physically possible. Unless you fill the room with all possible images from all possible eye possitions in the room. That would mean, i.e., using say 800 cameras to shoot the movie (and 800 projectors, etc).
Now, if you carefully build a theater with a (highly) engineered screen using the usual methods (lenticular or equivalent holographic filters, barrier, prisms, directional lights, etc) and place the seats strategically in key possitions (no more sitting right next to your date) and ask people sitting there not to move their heads much, I guess you could get away with 4-5 cameras and 4-5 projectors, which is feasible and not too expensive nowadays.
Otherwise, refer to the short answer. It can't be done. Don't expect it anytime soon (with good results, on a "reasonably cheap way" and for a large audience).
On a handheld device and for a small audience it can be done, of course. Many here, myself included, have shot plenty of 3D photography with 3 or 4 lenses cameras during the 80's and used a lenticular screen to have glasses-free 3D photographs. And plenty of glasses free monitors have been marketed, one of the latest ones being the Philips Wow (recently pulled from the market) or the Newsight.
http://www.youtube.com/watch?v=xiTfFMGk58c
http://www.newsight.com/3d-products/displays/mv-42ad3.html
Even sterographics, the company that eventually sold out to become RealD, had autostereoscopic monitors for a while
http://www.inition.co.uk/inition/product.php?URL_=product_stereovis_stereographics_synthagram&SubCatID_=50
But again: with restrictions on viewing zones, sucky results (fake depth restored from 2D depth map), restricted mostly to CGI content (for better results), etc.
More of a gimmick that anything else that works OK for a small audience, with restrictions, with imperfect results and with carefully (and more costly) specifically created content (i.e. CGI and multicam shoots).
Here is an incomplete list of glasses-free 3D monitors that have come (and most of them gone) in the past:
http://www.stereo3d.com/displays.htm#auto
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