Recently, my friends and I went to see the movie Star Trek 2. He said that these 3D movies are all synthesized by projection, and they are shown directly through the projector ~ ~

Actually, it's not. The following is based on IMAX 3D technology to explain.

First of all, let's talk about the imaging principle of movie 3D vision: this thing is simple to think of, but difficult to say. In order to understand, we might as well do a small experiment first, put our left hand or right hand in front of our face, and then open and close our eyes alternately. At this time, you will find that the left eye and the right eye see different pictures. When the eyes are closed, a complete picture is formed. The principle of 3D movies is similar to this. IMAX 3D adopts polarized 3D technology (not detailed here). Two slightly different pictures are projected onto a screen by two projectors, and then the picture is divided into a picture that can be clearly accepted by both eyes through 3D glasses (the picture is blurred when the glasses are taken off). When two images reach the brain at the same time, 3D vision will be produced.