Originally Posted by Freelancer
James Cameron helped solidify the plans for the technology only a few weeks ago. As for the glasses, it depends on the tv, not the blu ray- I believe most use alternating frequencies, so the glasses would be the brand of the tv you have.
the way i've been told is that they get that effect by flicking both images on both sides extremely quickly and the glass's are nearly like polaroid sunnies, they blur the image and you end up with it.
but in order to do this properly you need insane hz.
from what i've heard it's in the 1000's hence why it's so expensive.
240hz just wont give the illusion properly.
***Special Treat to those who read the post all-the-way to the end... you'll thank me later***
Yeah there's a few things wrong with your assumptions.
Almost every 120Hz and 240Hz TVs accept only 60Hz inputs... and using a little logic they guess in the in-between frames. They have NOTHING to do with 3D.
Here's pretty-much the complete list of all TRUE 120Hz TVs on the market (or otherwise 3D capable):
http://www.3dmovielist.com/3dhdtvs.html
Notice how only 19 of them are LCD/Plasma/CRT... and the rest are those boxy rear-projection... and of those 19 -- 2 are laptops.
If it's not on this list... yeah... basically you can't do 3D on it regardless of what the box says. The shutters flip at 120Hz... but the plugs attached to it only listen to 60.
Most 3D BluRay movies will run on synchronized shutter glasses. Basically each eye will only see half of the refresh rate that the TV gives. If you have a 120Hz monitor (that actually can accept 120Hz... not just smooth out between frames). This requires some sort of synchronization device (having left eye open while the right eye is visible would, needless to say, ruin the effect)... nVidia uses Infrared -- but the old ones were wired.
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In the movies you have a few more options... and the reason why is because you can have a really fucking expensive projection in a movie theatre... as long as the glasses are cheap because they're basically 1-use.
As a result... there's a few options...
The first is having vertically and horizontally polarized light... without going into light theory... basically one has every photon's electric field pointed up and down... and the other has every photon's electric field pointed right and left.
You can have one eye block up and down... and the other block right and left... and you'll be fine. The problem is if you then need to keep your head perfectly straight.
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The second corrects this problem by adding a circular-to-linear polarizer on the lens. Clockwise light would convert to either horizontal or vertical -- and counter-clockwise would convert to the other. Since it's spiral-shaped... turning your head doesn't change the direction of the spiral -- so you can always get the correct polarization in the correct eye. This is "RealD".
The problem is you then need a special screen to preserve polarization of light upon reflection... that's expensive.
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The third way -- which is VERY rare -- uses a little colour science. Any colour can be made up of red, green, and blue. You can make an eye see yellow by giving it one particle of red, and one particle of green.
The way Dolby gives 3D is it has two slightly different shades of red, two slightly different shades of green, and two slightly different shades of blue.
One R/G/B set gets blocked by the left eye but transmitted by the right... and vice versa. The difference in the Red-Left/Red-Right, Green-Left/Green-Right, Blue-Left/Blue-Right is just ~15nm. No polarization required -- left sees a full set of RGB values... right sees a full set of RGB values... and thus, 3D.
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The anaglyph 3D you see here --
is not used by just about anything anymore... let alone BluRay 3D.
... Just about the last use of Anaglyph 3D is Youtube... and it's also got an option for "Crosseye 3D" which gives you a migraine after 2 minutes.
http://www.youtube.com/watch?v=qftUs9ppnbA&NR=1
((Click the drop-down menu under the video and select "Cross-eyed"... then cross your eyes and look at the video in the centre))
And yes... Youtube has allowed 3D since like -- July.
To that I say...
http://www.youtube.com/watch?v=OkBN1FX8rqE
POW! HAHA!
Last edited by Phopojijo; January 9th, 2010 at 12:00 AM.
Ah, very good information there, I was under the assumption that Blu-Ray 3D would go down the road of nVidia's shutter glasses since you only need refresh rates of 120Hz to pull it off. I didn't know that most of the higher Hz televisions available only accepted 60Hz inputs though.
Before Avatar the last 3D experience I had without expensive Nvidia shit was the color altering method, and overlaying that over a feature film just fucks up all the colors and ruins the experience. I did know that IMAX used "RealD" polarization when I went into the theater and when I heard that they were going to retail a 3D Blu-Ray I was wondering how they'd do it.
Bottom line, we shouldn't get a new TV any time soon if we want to make use of Blu-Ray 3D features in the future, correct?
It all depends... there'll be a huge blitz of 3D-ready TVs... probably in the summer or before Christmas.
If you want a rear-projection TV with the whole quick-to-die bulbs and such -- it's good now. The big LED-LCD TVs will be coming shortly... CES had several of them... including an LG LEDTV that has backlit LED.
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To explain why the eye only needs Red Green and Blue light to see all colours -- is because our eye can only see Red, Green, and Blue.
Here is a picture of the full spectrum of light... and what the "Red detector" can see... what the "Green Detector" can see... and what the "Blue Detector" can see. (The thin black line is how our perceives brightness, not colour... so it's useful for like... nightvision and edge/detail detection)
As you can see... Yellow light causes both Red and Green retina nerves to respond. So technically... firing a red photon and a green photon at two adjacent red and green retina nerves... will produce the same response as two yellow photons... one hitting a red, one hitting an adjacent green.
So how can your eye tell the difference? It can't!
A side note -- the red and green overlap a lot... the more those two receptors overlap in response... the more red/green colourblind the person will be. Why? Well if the red sensors and the green sensors both respond exactly the same to any given photon... a green sensor can see a red photon and a red sensor can see a green photon. Colourblind.
(The guy the picture was modeled after was probably slightly colourblind... but that's just a guess).
Red/Green/Blue Colour isn't some Physics-given... it's just how our brain works. It sees how close a photon is to either Red, Green, and/or Blue... and then says "Well it's halfway between red and green... so it must be yellow".
Last edited by Phopojijo; January 9th, 2010 at 12:42 AM.
Ah okay...
So most 3D capable televisions are goign to use "RealD" style shutter glasses and I assume 3D projectors will use the polarization method used in IMAX 3D flicks? I can't seem to find much info on 3D capable projectors on Engadget, have you seen any information regarding these?
... no... but I seriously doubt projectors will use RealD. The real cost in RealD is the special silver-based screen that preserves polarization on reflection. I believe REAR Projection TVs work on it... but yeah.
Well, I know that if they decided to mass-produce some screens like that the cost would definitely go down, and it's not like the entire screen is made of woven silver... I guess we'll have to wait a few more years for home theater 3D to catch on before that happens.
Double posting because I just got back from seeing this again in IMAX 3D, god it's so good... One of those movies that I'd rather live in than real life, know what I mean? I can't believe how amazing the 3D and CGI on this movie come together for an almost surreal immersion experience, I'm not ashamed to say that this movie actually shook me a small bit... I just grabbed the soundtrack and it's pretty awesome as well, however could someone tell me what this trailer music is?
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