As far as imax is concerned, is there a technical difference between flying swords of dragon gate and Avatar? It may be related to the major. ...

There is a big difference. Most of the pictures in Avatar are computer stunts, and a few are taken by real people. Legend has it that they were shot in Zhangjiajie, China and mangrove forests in the United States, while most of the flying swords in Longmen were shot in real scenes, and a few were computer stunts.

The characters in Avatar are all computer stunts, but their movements are very natural and their expressions are more abundant. This uses motion capture and expression capture techniques. When an actor performs (in the studio, of course), he should wear close-fitting tights for motion capture and a helmet for facial expression capture. Then Cameron combined the collected data with the computer characters, and two 3d cameras captured the 3d actions reflected by the actors' infrared rays, and the magic in the movie appeared. Of course, not only people, but also big birds on the cliff. Apart from the complicated biological expression, the whole Avatar recreates a world. Every grass and tree needs computer stunts, or taking pictures and synthesizing stunts.

It's much easier to fly the sword in Longmen. After the live shooting, some scenes were enhanced in 3D, such as the scene between the East Factory and the West Factory in Miaoli. Many scenes are post-produced, such as tornadoes, flooded palaces and large ships floating on the sea.

All shooting must use imax3d camera, that is, dual-camera shooting. If the camera is digital, its effect is equivalent to 70 mm film. It should be all digital cameras by now. Although the film imax is better and more delicate, it is too bulky and basically quits the historical stage.