3D TV's are coming down in price. BB has a 51" plasma 3D on sale for $899!

Which is why I bought the 3D Blu-ray of Legacy, even though my current TV doesn't support it. I knew the day would come when a 3D TV would be semi-affordable. I'm hoping in two or three years, the technology will be even better and cheaper. I'm dying to see all the 3D-specific scenes again in Legacy!

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Modern 3DTVs do not use red/blue 3D. Instead, they use a shutter-like system where the image on the screen is actually the left and right eye images alternating between each other so fast that it looks like a combination of the two images combined. The 3D glasses' lens are actually 1 pixel LCD transparent screens that are on or off depending on which image is on the screen, which they know from communicating with the TV through a wireless connection. So whenever the left-eye image is on the screen, the right eye lens screen pixel on your 3D glasses turns on, effectively putting a shutter over your right eye, so only your left eye can see the left eye image. Likewise, when the right-eye image is shown on the screen, a shutter is effectively placed over your left eye, so that only your right eye sees the right eye image. This effect works because the rate of the images switching between each other is so fast that your eyes can't notice the change.

In theaters, two separate projectors project the left and right eye images onto the screen, each one with a unique pattern. The lens on the special 3D glasses you get at the theater are designed so that the right eye image is blocked out to the left eye, and vice-versa, due to the patterns on the image.

As for how the person made this video, I'm not 100% sure, but my guess is that they ripped the video from the 3D Blu-Ray disc for the left and right eye images (I'm assuming here that the 3D effect for 3D Blu-Rays is produced in real time, meaning that the entire movie is on the disc twice, one for the left eye, another for the right eye, and that the frames are alternated between in real time by the player). They then overlapped the left and right eye images for this particular scene after applying a red and blue overlay to the images. Render it out, save as an avi, upload to Youtube. All done.

Just remember, the entire trick to 3D is having two images, one for the left eye, and one for the right eye, and ensuring that the right eye only ever sees the right eye image, and that the left eye only ever sees the left eye image.