Are 3D movies shot in a special way or made with software? If it is shot in a special way, why is there a TV that is converted from 2D to 3D?

Pseudo-3D in 3D Games

Pseudo-3D is called pseudo-3D because it uses some effects and concepts of 3D games, but it is not completely 3D. First, the concepts of 2D and 3D should be confirmed. Generally speaking, the concepts of 2D games and 3D games are relatively clear. In order to be more clear, I will say it in two sentences. 2D means that all the game screen effects are represented by a plane, and all the contents in the game are represented by a plane. Whether it's a game that can scroll up and down or a game with a tilted angle of view, Contra is a 2D game because its expression is flat. 3D refers to a game in which three-dimensional coordinate axes are realized in the computer virtual space through technical means, and the position of the character you control can also change on the three-dimensional coordinate axes, such as DOOM and QUICK in the stand-alone era, EQII and WOW in the online game era, etc. I believe most people agree with this view, because 2D games and 3D games are relatively easy to distinguish. The easiest way to distinguish 3D games is to see if the 360-degree viewing angle can be changed. If it is, it is obviously pure 3D (PS: confused with cartoon rendering class. )

There are obvious differences between 3D movies and 3D graphic movies.

three-dimensional film

D is the prefix of English Dimension, and 3D refers to three-dimensional space. Internationally, 3D movies are used to represent stereoscopic movies. The reason why human vision can distinguish distance is because of the difference between two eyes. People's eyes are about 5 cm apart, and nothing will have the same angle except aiming straight ahead. Although the gap is very small, it is transmitted to the brain through the retina, and the brain uses this tiny gap to generate the depth of distance, thus creating a three-dimensional sense. Although one eye can see objects, it is not easy to tell the distance between them. 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, which we call "polarization principle".

There are many forms of making 3D movies.

Polarized glasses method is widely used in 1. 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. 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 to form a double image of the left image and the right image. 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. Show a coherent three-dimensional picture, let the audience feel that the scenery is coming, or enter the deep recess of the picture, which can produce a strong sense of "being there".

At present, cinemas mainly show two kinds of 3D movies with different principles:

1 is a three-dimensional movie represented by imax big screen. This technology is the best, which is called polarized light technology. When playing, two projectors with polarizers are used to display two parallax images at the same time, that is, the images that the left and right eyes want to see respectively. So, if you don't have charged 3d polarized glasses, what you see on the screen is a ghost, and the 3d glasses worn by the audience are two polarized lenses. Through them, our left eye and right eye can see the parallax images of the left eye and right eye projected on the screen respectively, thus creating a stereoscopic effect. The screen of imax cinema is as high as seven meters, the image is very clear, the 3d effect is strong, and the sound is great. It is the best stereoscopic cinema at present.

There is also a three-dimensional film called red and blue complementary colors, which has been shown in China before. When watching a movie, the cinema will give the audience a pair of left red and right blue filter glasses that can be bought for a few dollars. After wearing, the left eye can see the red shadow image on the screen, and the right eye can see the blue shadow image, thus creating a stereoscopic image. This kind of stereoscopic film is much worse than imax, and the stereoscopic effect is even worse, but the cost is lower, and it can also be shown on ordinary movie screens. More people can experience the visual magic brought by three-dimensional movies. At the same time, because this kind of movie has no restrictions on the screen, we only need to spend a few dollars to buy a pair of red and blue stereoscopic glasses, and we can watch stereoscopic movies on the computer.

Another commonly used technology is the principle of stereoscopic glasses. This kind of stereoscopic glasses turns off the left and right liquid crystal lenses alternately in time sharing, and plays the parallax images of the left and right eyes synchronously and alternately on the screen with the playing software, so that our left and right eyes can see the parallax images respectively. As long as the alternating speed is fast enough, we can see stereoscopic images without flicker. Therefore, the requirements for computer monitors are higher, and CRT monitors are needed, and the refresh frequency is at least above 100mhz, but it is convenient to cooperate with computers.

Three-dimensional image film

3D is the abbreviation of 3 d, which means 3 d graphics. Displaying 3d graphics in a computer means displaying 3D graphics in a plane. Different from the real world, the real three-dimensional space has a real distance space. The computer just looks like the real world, so the 3d graphics displayed on the computer are just like the real world. One of the characteristics of the human eye is that when the distance is combined, it will form a three-dimensional sense. The computer screen is flat and two-dimensional. The reason why we can appreciate the real three-dimensional image is that the difference in color and gray level when it is displayed on the computer screen makes the human eye have a visual illusion and perceive the two-dimensional computer screen as a three-dimensional image. Based on the knowledge of chromatics, the protruding part of the edge of a three-dimensional object generally presents a high-brightness color, while the concave part presents a dark color because it is blocked by light. This understanding is widely used to draw buttons and 3d lines in web pages or other applications. For example, the 3d text to be drawn, that is, the high-brightness color is displayed in the original position, and the outline is outlined in the lower left or upper right position with low-brightness color, which will visually produce the effect of 3d text. In the concrete implementation, two 2d characters with different colors can be drawn in different positions with exactly the same font. As long as the coordinates of two characters are appropriate, 3d characters with different effects can be produced visually.

These are all things that 3D software must do, and there are also specific software. For example, the Sandman 3D software in Spider-Man is a legend in 3D history. Because the director's requirements are very strict, the 3D software for making Sandman is customized, and the software production time is calculated in years.

Commonly used 3D software abqus acrobat 3 d ADAMS alias algor ANSYS

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