How was the long shot of Leonardo being bitten by a bear made in the movie revenant?

With the development of science and technology, when we watch movies, we are often surprised by some scenes in the movies, because she can take many pictures very realistically. So how did Leonardo shoot a long shot of rage and biting in the movie fistful of dollars?

I think in the filming of movies or TV series, the most difficult thing to describe is the scene of people and animals, because people and animals are different, so we can do corresponding actions according to the meaning of the plot. In many cases, they can't finish these tasks, so it will be very difficult to shoot. In the movie fistful of dollars, the scene of a bear biting Leonardo is very realistic, which is really a very technical thing.

First of all, the crew needs to simulate the movements of bears and some videos of real animals and humans as a good reference, which requires a lot of reference from the staff. Of course, the most difficult thing is to let the bear cooperate with the staff to take these shots. Moreover, bears can't be too fierce or too weak, which can't give the audience a good visual experience.

Therefore, all of these need to be produced and directed by the later special effects, which requires that the special effects should be done well in advance, and then the actors, after watching the content of the special effects, and then every subtle action should be coordinated with the action of the lion in the special effects, so as to show the opposite performance, because any small deviation will make it difficult for the audience to enter the role, and will not bring the audience the feeling of being bitten by a bear and struggling in fear. So revenant's work is still very successful.