? Gravity begins with an unforgettable 13-minute uninterrupted shot, which shows the magnificent scene of observing the earth from space. The space station in the sun and three astronauts in spacesuits gradually appear in front of people. Suddenly, a large number of debris from a satellite explosion quickly hit the space station, killing one astronaut, while another astronaut Matt kowalski (George Clooney) and medical engineer Ryan Si Tong (sandra bullock) were floating in space, helpless. The following films are all trying their best to save themselves, trying to reach the nearest space station, and facing the threat of reduced oxygen.

? This 3D movie contains a lot of long shots and smooth camera movements, which makes the beautiful and dangerous space environment more realistic and richer in details. This is the level reached by director Alfonso Cuarón, photographer emmanuel lubezki, visual effects director Tim Webber and their team after five years of cooperation. Caron and Lubetzki are old friends. They co-produced six films, including Your Mom, too, and The Son of Man, with Tim Weber as the visual director.

Lubezki claims that in the gravitational outer space scene, only the face of the actor under the helmet is actually photographed, which makes the film more memorable technically and aesthetically. Everything else in the outer space scene, including the spacesuit, the space station and the earth, is made by CG. Similarly, in one scene, Si Tong floats on a spaceship without a spacesuit. Brock is hung on the set by a steel wire, and her surroundings are digitally made.

The setting of space environment requires that the lighting design link includes three main light sources: distant hard sunlight, soft light reflected by the earth and occasional reflected light from the moon. "This setup doesn't look like real outer space or inside a space station," Lubezki said. "In space, people are faced with darkness, and they can only see part of the sun, part of the earth and occasionally the moon. In that case, the movie of 100 minutes is not so attractive, so Alfonso and I decided to constantly change the lights. "

The shooting techniques used are:

1. Trajectory Design-Frame Storage

Cuarón and Framestore worked out the trajectory of the earth in the film, which will determine what the earth looks like in the film.

2.Previs -

Frame storage

Cuarón and Lubezki collaborated with a group of animators to produce a low-resolution animation preview of the film. Contains virtual camera motion.

3. Pre-lighting Design-Frame Store

Lubezki cooperated with a group of technical directors to design the lighting effects and CG assets of each virtual scene in the movie, and optimized it for quick rendering and feedback.

4. pre-DI

Cuarón, Lubezki, digital color director J.Scott and visual effects director Tim Webber used two independent and accurately calibrated DI cinemas, one in Los Angeles and the other in London, to optimize the color matching scheme of four clips in the film and work in real-time environment. The color matching result is output (sometimes just one frame) and sent to Framestore as a reference picture for the final lens visual effect.

5. Technological vision-

Frame storage

Previs and previous lighting design data will be used to set camera trajectory and lighting parameters, thus simulating the subjective perspective of each character in the film.

6.LED light box real shot-Shepperton