The realization of the iconic one-take scene required close collaboration between a number of film departments: directing, cinematography, stunts, makeup, costume, and, of course, the visual effects artists behind the CGI bear, Industrial Light & Magic (ILM). To shoot the scene, DiCaprio acted with stand-in blue-screened stunt performers on the forest floor, who sometimes wore extra padding for the proper bear proportions. The actor was also pulled on wires to create the bear's jerking motions.
ILM spent months researching and reviewing bear references before animating a photorealistic animal complete with muscle and hair simulations, even adding dirt, pine needles, and blood into the bear's fur. The final shot (which was actually a combination of several shots to make it look like there were no cuts) also required painting in extra wounds on DiCaprio and crafting the interaction between clumps of dirt and moss on the forest floor as he is thrown around.