What's with 3d photography? What's the difference between it and ordinary photography? Be specific. thank you

The so-called 3D is actually the abbreviation of English 3D. We all know that points are one-dimensional, lines and surfaces are two-dimensional, and space is three-dimensional. The so-called 3D imaging is the imaging with three-dimensional depth, just like this space where we live. Our usual image recording form is 2D, that is, plane. Although the application of software such as 3DMAX can help us to build a 3D model in plane space, this model only uses the experience of human eyes in spatial perception to create 2D graphics similar to 3D. ?

How do our naked eyes perceive the three-dimensional space we live in? It depends on the parallax. Our eyes are about 5 to 6 centimeters apart. They look at pictures from different angles, and the brain fuses the two images to form a three-dimensional image. It is the difference between these two images that enables us to distinguish the distance between objects and us. Euclid, an early mathematician, found that the reason why human beings can gain insight into three-dimensional space is because the left and right eyes see things differently-that is, what we call binocular parallax, which is the basic principle of three-dimensional imaging. ?

Why do we say that the pictures and movies we have seen before are all 2D images? The key is that the camera that records the image and the camera that records the image mostly work with the same lens. Just like we see the world with one eye blindfolded, we can't perceive the distance between an object and us because of the loss of binocular parallax. Do a small experiment, put a pen not far from you, with the nib facing up, then cover one eye and look with only one eye, reach out and touch the nib. You will find that we can't locate and touch the pen tip as accurately as we usually do with our eyes. If there is no differential positioning of "eyes", the images obtained by our camera will lose the sense of three-dimensional depth, thus being confined to a flat screen.

Simply put, 3D photography is to use the visual difference between people's left and right eyes, and the two films are the perspectives of the left and right eyes respectively. ?

Sorry, the picture of GIF will not move after being uploaded!