About the principle of 3D movies.

There is a distance of about 6 cm between people's eyes, so there must be different angles between them except the objects in front of them. This difference can automatically form the difference of up and down, left and right, front and back, distance in the brain, thus producing stereoscopic vision. So if you can make different sides of the same scene and image (only slight parallax) so that your eyes can see each side, then the stereoscopic image of this scene can be automatically formed in your brain. The shooting, production and projection of 3D movies is the process of simulating human eyes to observe the scenery. When shooting, it uses two movie cameras to shoot the same scene according to the distance between the two pupils of the human eye (about 65mm), thus obtaining frames (left and right eye images) from different angles, and then projecting the images onto the screen at the same time, at this time, two overlapping and staggered images will appear on the screen. When watching 3D movies, viewers can see the left image with their left eyes and the right image with their right eyes as long as they wear "stereoscopic glasses". At this time, it will automatically reappear in their brains in the form of stereoscopic images. This is the principle of 3D. I don't know if this is what you want to know.