Merida, the main character in Pixar's "Brave" (opening June 22), has thick, curly locks. Pixar's animators had to work hard to get her hair to react properly as she moves around and bumps into things. The same went for other elements in the film, such as bear fur, multiple layers of clothing, and water in a river. To overcome these challenges, the studio created a new software tool capable of updating what it can do with such animation.
When Merida rides Angus, her hair flows, as does that of the horse. Animators at Pixar had to figure out how to ensure that the audience doesn't get distracted by unrealistic movement of any of that hair or fur.