Cinema experience and other aspects of the 3D movie industry have been immensely a product of great physics principles. Starting from the green house, Computer Generated Images(CGI), and greatest of all, 3D movie experience. Most times, people walk into cinemas and out without appreciating how much of the advanced level physics is in work to provide them with the jaw-dropping moments.
When 3D movies are being made, so many science facts are grouped out, but it's majorly the deception by our brains that lets us view the images from the screen as 3D components just as we see in a normal day.
How our eyes and brain coordinate to produce 3D images.
Have you ever pressed one of your eyes and the result becomes two distorted images of the objects around you? That's to remind you that your eyes make two identical images, but because our eyes are positioned to take each pair of images as a product of two cameras placed few inches apart, our brains are able to process the small variations between the two images to know whether something is three dimensional or not.
Our brains are simply hard coded to provide accurate 3D visuals using the two images provided by our eyes. If you can take a quick visual and think of what would happen if you were to provide your eyes with two images taken by two cameras at approximately the same distance apart as that of your eyes then guess what, you'll be seeing those images like they are real objects just in front of you because of how your brain is hard coded. That's how 3D works.
Machinery used in 3D movie production
As explained before, to make three dimensional images, you need to provide the eyes with two different images. Movie directors use two cameras placed at approximately the same distance apart as your eyes. They then take the two videos through a series of light polarisation as explained below.
How 3D movies are polarized
If you studied Advanced level physics, then polarisation is an obvious thing to you, but if you didn't, I'll try all I can to explain it.
Light travels as a form of vibrations on two major layers. There are vertical vibrations and horizontal vibrations. Polarizing light then becomes obvious - reshaping light by blocking either vertical or horizontal vibrations inorder to allow only one plane vibrations. To polarize light, you need a Polaroid or polarizer. This is like a paper with only vertical or horizontal slits so when you shoot small sticks in random planes towards the paper, only those that are in the vertical or horizontal planes pass through.
So the two videos made by the two cameras are alternate-polarized in a way that one has vertically vibrating light while the other has horizontally vibrating light. Because light is a mixture of horizontal and vertical vibrations, those two videos can be transferred as a single beam of light.
How 3D glasses work
So once the videos are in the cinema, it's now your 3D goggles to separate the two videos for you. The 3D glasses are made in such a way that one allows horizontal vibrations while the other allows vertical vibrations. That means two different videos are placed into your eyes.
As we saw at the beginning, when two images made by two cameras identical to the eyes are drawn into your eyes, the brain is tricked making it see actual objects instead of the real hard screen images. There is also another popular low cost 3D manipulation tactic where two projectors ,one on top of the other, are used.
How two projectors produce 3D visuals
Just like we started, one projector is placed with a Polaroid and the other is also placed with an opposite Polaroid then the viewers are given 3D glasses to help distinguish between the two images. The vertical distortion between the two videos does not affect the way viewers see because the brain will strain to place the two videos in order.
That's it all I have about 3D imaging. I would like to know if you have ever tried spinning a Polaroid infront of polarized light. Let me know what happens and if you have any questions you are welcome to simply place them in the comments section or the contact us form. Thanks.
AUTHOR
Emmy Jayson
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