What is the principle of 3D movies?

There is a distance of about 6 centimeters between human eyes, so except for objects directly in front of you, the two eyes must have different angles. This difference will automatically form up and down, up and down, and up and down in the brain. The difference between left and right, front and back, far and near, thus producing stereoscopic vision. Therefore, if you can create different sides of the same scene and image (with only slight parallax) so that both eyes can look at one side, then a three-dimensional image of this scene can be automatically formed in the brain. The shooting, production and screening of 3D movies are the process of simulating the human eye to observe scenery. It uses two movie cameras to shoot the same scene according to the distance between the two pupils of the human eye (about 65mm), thereby obtaining frames (left and right eye images) from different angles, and then simultaneously projects the images to On the screen, two overlapping images will appear on the screen. When watching a 3D movie, as long as the audience wears "stereoscopic glasses", the left eye can see the left image and the right eye can see the right image. At this time, the three-dimensional image will automatically be reproduced in the brain as an accessible three-dimensional image.

This is the principle of 3D. I wonder if this is what you want to know