How was Avatar filmed?

Use motion capture technology to shoot. The skin of Nami people and strange animals is synthesized by CG in the later stage of computer.

Principle of motion capture technology

A tracker is set in the key part of the moving object, and the position of the tracker is captured by the motion capture system, and then the data of three-dimensional space coordinates are obtained by computer processing. When the data is recognized by computer, it can be used in animation, gait analysis, biomechanics, ergonomics and other fields.

Extended data

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With the formation of a series of related industries that use computer as the main tool for visual design and production, the field of visual design and production using computer technology is usually called CG in the world.

It includes both technology and art, including almost all visual art creation activities in today's computer age, such as graphic design, web design, three-dimensional animation, film and television special effects, multimedia technology, architectural design based on computer-aided design, industrial modeling design and so on.

Acoustic motion capture

The commonly used acoustic motion capture device consists of a transmitter, a receiver and a processing unit. The transmitter is a fixed ultrasonic generator, and the receiver is generally composed of three ultrasonic probes arranged in a triangle. By measuring the time difference or phase difference from transmitter to receiver, the system can calculate and determine the position and direction of receiver.

The cost of this kind of equipment is low, but the delay and lag of capturing motion are large, the real-time performance is poor and the general accuracy is not high. There should be no big shield between the sound source and the receiver, which is greatly interfered by noise and multiple reflections. Because the propagation speed of sound wave in air is related to air pressure, humidity and temperature, it must be compensated accordingly in the algorithm.