Why do 3D movies give people an immersive feeling?

Human eyes can judge distance and produce stereoscopic vision because when the left and right eyes observe the same object, the images formed on their respective retinas are slightly different, which is scientifically called parallax. ?. The brain processes two different images and merges them into one, and the external world becomes three-dimensional. ?

In fact, 3D movies use the imaging rules of the brain to play a little trick. In real life, when we look at something, the scenes we see with our left and right eyes are actually slightly different. This difference is processed by our brains and becomes a three-dimensional 3D image. image. This function of the brain helps us judge the size and distance of objects, which is very important for our ancestors to survive in the wild. This is because when hunting in the wild, we need to decide what strategy to adopt based on the size and distance of the prey. Obviously, under the same conditions, prey that is closer is easier to capture.

When making a 3D movie, two cameras, one on the left and one on the right, need to be involved at the same time to simulate the images seen by each eye. During the screening, the two films shot were simultaneously projected onto the screen. The viewer wears special glasses, and through certain optical principles, the left eye can only see the image captured by the "left camera", and the same is true for the right eye. In this way, the scenes seen by the eyes are both related and different, and the effect is the same as when observing the real three-dimensional world.

The images input to our left and right eyes in 3D movies need to be different, so that the images will become three-dimensional images after being processed by our brains. This is why we need to wear special glasses when watching 3D movies, and most cinemas now use polarized 3D glasses. As for polarized 3D glasses, each lens only allows specific polarized light to pass through. The polarization directions of the polarized light of the left and right lenses are perpendicular to each other, and the imaging information they carry is slightly different, so that what we finally see is a three-dimensional 3D image.