Nowadays, 3D films have sprung up everywhere on the domestic big screen, and stereo vision effects are not only a patent for imported films, but also domestic films have begun to produce 3D films either true or false (of course, imported films will also be true or false). However, what most young people do not know is that as early as 1981, an American 3D western gunfight film called "the Gunner Hart" (also known as "the bad comer") was introduced to the domestic screening. At that time, it was commonly called a three-dimensional film. The film was introduced not only because of its novel visual effects, but mainly because the film, which was in a bleak period, entered the cinema and sparked a 3D movie boom in the United States at that time. (in the first half of the 1980s, 3D films were unpopular, and few companies were willing to make 3D films, and even if they did, it was difficult to get into cinemas, mostly directly distributed in videotape / DVD/VHD). At that time, the 3D technology was left and right eye technology, and the production cost and projection cost were very high. Tony Anthony, one of the film's leading actors, invented a cheap projection lens, which made the film much cheaper to show, so cinema owners were willing to show the film. After the first round of projection, the 3D glasses.
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