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Can you see the 3D stage effect on the spot? Than watching it on TV?
The 3D stereoscopic stage effect can't be seen at the scene, but it can be seen on TV with 3D glasses. Because the 3D stereoscopic stage effect is formed through post-processing. In order to let people see 3D images, it is necessary to let the left eye and the right eye see different images, so that there is a certain gap between the two images, which is to simulate the actual situation when human eyes watch. That's how the three-dimensional sense comes from.

During screening, two films are respectively loaded into the left and right film projectors, and two polarizers with polarization axes of 90 degrees are respectively installed in front of the projection lens. The two projectors need to run synchronously and project the picture onto the metal screen at the same time, forming a left and right double shadow.

When the audience wears special polarized glasses, the polarization axes of the left and right polarizers are perpendicular to each other and consistent with those in front of the projection lens; The viewer's left eye can only see the left image, and the right eye can only see the right image. The left and right images are superimposed on the retina through binocular convergence function, and the brain nerve produces stereoscopic vision effect.

Presenting a continuous three-dimensional picture, let the audience feel that the scenery is coming, or enter the deep recess of the picture, which can produce an immersive feeling.

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There are many forms to make 3D stereoscopic stage effect, among which polarized glasses method is widely used. It uses human eyes to observe the scenery, uses two parallel movie cameras to represent people's left and right eyes respectively, and shoots two movie pictures with tiny horizontal parallax at the same time.

Although the audience can see the object with one eye, it is difficult to distinguish the distance from the object. According to this principle, if the same scene is made into two images by using the difference between the two eyes, and then each eye sees its own image on one side, the depth of field can be stereoscopic through the retina. Various three-dimensional demonstration technologies also use this principle.

Baidu Encyclopedia -3D Technology

Baidu encyclopedia -3D special effects