A huge dinosaur strides towards you, opens its mouth, bends over its head, another second … Jaws closed with a crunch! So what? And nothing really happened, it's just a movie, but a movie is not ordinary. The viewer gets the impression that he is not just sitting in the hall, but is in the thick of the unfolding events. This effect is called 3d.
3d is an abbreviation for the term three-dimensional or three-dimensional, that is, three-dimensional. The ordinary world around us is also three-dimensional. The eyes observing what is happening around them perceive the surrounding objects at different distances from them. Since a person has two eyes, each of them sees an object from its own angle. Two slightly different images are sent to the brain, where they are immediately analyzed. As a result of a complex, but very fast recalculation, the brain produces a three-dimensional image that allows, for example, to estimate whether an approaching car is far or close, you can already cross the road, or it is still worth waiting. 3D technology uses a very similar principle; when watching a movie, the eyes constantly get two different pictures of the action taking place on the screen. It should be borne in mind that when watching a regular film, 24 statistical frames per second are scrolled in front of the viewer. The brain needs some time to process each of them, and while it does this, the next frame replaces the previous one, creating the impression of movement. In a 3d movie, essentially the same thing happens, only the number of frames is doubled. The eyes are offered 48 images per second, alternating left-right, left-right. The picture for the left eye is broadcast on a slightly different light wave than that for the right one. If you just look at the screen, you will not see anything but a muddy, rippling picture. Special glasses are equipped with lenses with built-in polarizing filters capable of transmitting light beams of a certain length. Each eye sees only "its own" picture, forwards information to the brain, and that, according to the usual, long-worked algorithm, models a three-dimensional image from the received frames. 3d glasses have already become a common attribute of the modern viewer, but this does not mean at all that from now on it will be possible to watch movies only with them. Technology is constantly evolving and perhaps in the near future there will be another way to polarize the image. Three-dimensional cinema will move to a new stage of development, will become even more voluminous, interesting and exciting.
