While there's plenty of art that goes into making their stunning animated films, the animation is still done on a computer, which is made possible due to lots of math.

Computer animation is the art of creating moving images via the use of computers. It is a subfield of computer graphics and animation. Increasingly it is created by means of 3D computer graphics ...

Joe Letteri, Oscar-winning co-creator of Gollum on screen, looks at the evolution of computer animation as the next instalment of The Hobbit trilogy reaches cinemas.