Often seen in sports videos or action movies, the picture is still and then rotates 360 degrees around the viewing angle. How is this done?

This is the effect that many cameras shoot hundreds of arcs at the same time and then make them by computer.

If the cameras shoot each other, you need to use a computer to design a virtual background to hide the cameras.

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Special effects in The Matrix

The classic scene of Bullet Time (the scene where Neo leans back to avoid bullets and Sany leaps in the air with a 360-degree rotation) that people are talking about now contains a lot of painstaking efforts of the producers. Take neo's whole body leaning back to avoid bullets as an example. Although there are only two or three actors on the screen and the time is only a few seconds, it took several months to shoot this shot from the early preparation to the later computer processing.

The so-called "bullet time" means that the camera rotates quickly around the person being photographed while he is almost still. Now many people know that this shot actually uses multiple cameras. The producer takes the same action from different angles, then inputs it into the computer for processing, and finally adds the animation of bullets flying. But perhaps few people know that the picture of Bullet Time is so cool, but Gaeta, the special effects director of The Matrix, used this technology more than 100 years ago when photography first appeared.

/kloc-In the mid-9th century, shortly after the invention of silver plate photography, a cartographer named La Sedat made a bold innovation, tying cameras to kites, then letting them shoot the ground from different angles over Paris, and then converting these plane images into three-dimensional topographic maps through a series of operations. This method was later called "Photogrammetry".

In the 1990s, the French BUF design company encountered a similar problem-one of their clients wanted to check the defects of the building from Paris. However, the aircraft control in Paris is very strict, and non-military aircraft are usually not allowed to fly over the city. Later, the company's technicians found another way to synthesize two photos by computer, and they could also make a 3D model. This is somewhat similar to the way the brain works-transforming 2D images obtained by two people's eyes into a deep visual experience. Buff used this technology to help director Mitchell Gundley shoot a MV for Rolling Stone. In the MV, the camera passes through a large group of people in the room, all of which are still. This special effect caused a sensation in Europe at that time.

After Gaita further developed this technology, it was used in The Matrix-the scene was surrounded by 122 fixed cameras, imitating a camera that could move at any speed. But because the cameras are surrounded, one camera is easily photographed by other cameras. Therefore, they also need to use computers to generate virtual scenes in order to remove the images of these cameras in the post-production process.

In The Matrix-the scene is surrounded by 122 still cameras, imitating a camera that can move at any speed. But because the cameras are surrounded, one camera is easily photographed by other cameras. Therefore, they also need to use computers to generate virtual scenes in order to remove the images of these cameras in the post-production process.