What is a 3D movie?

3D film is a kind of "3D film" (English: 3-D film), which uses stereoscopic vision display system, and then creates stereoscopic images of left and right eye plane projection images, which makes the audience have unrealistic stereoscopic depth to the images.

Technically, two cameras are usually used to take images at the same time to obtain the stereoscopic impression of the left and right sides of the object. When watching, the visual cortex of the audience will automatically combine the images into a single three-dimensional image. Modern computer technology has been able to use CGI computer special effects to make three-dimensional movies without using traditional dual-camera shooting. You need to wear appropriate stereoscopic glasses when you appreciate it.

The lens is actually a pair of polarizers whose vibration transmission directions are perpendicular to each other. The principle is that only when we look at an object with two pairs of glasses will we have a three-dimensional sense. If we use two lenses to shoot a movie scene from two different directions at the same time, like the human eye, we can shoot a positive film.

When projecting, two kinds of pre-polarized light with perpendicular vibration directions are projected on the screen by two projectors, and human eyes can only see a corresponding independent image through polarized glasses. You will have a three-dimensional sense like looking directly at it.

Extended data:

1, history

In 1936, a film with stereoscopic effect can be made by using a dual-lens camera and a polarizer, but this technology has many limitations. After the development of RealD 3D and other technologies and the popularity of three-dimensional movies such as Avatar, three-dimensional movies have been widely promoted. An Australian director claimed that he had successfully made two three-dimensional films during Nazi Germany in 1936.

2. Technology

Computer-generated images are computer-generated images, more precisely, 3D special effects applied in movies, which are also common in TV programs, advertisements and print media. Real-time computing graphics often used in computer games belong to the category of CGI, and some of them are used in game fields or introduction pages.

What I saw in the cinema was a three-dimensional version of IMAX and RealD technology. In order to create a three-dimensional depth of field, IMAX 3D uses dual cameras and dual projectors for shooting and projection. RealD uses dual projectors and circularly polarized light for projection. At present, IMAX 3D is polarized light projection, and stereoscopic images are analyzed with polarized glasses.