Light is an important part of storytelling providing performance, setting the mood in a scene, and plunging the audience into the environment Disparate light in a live action film that is captured by a camera, light in a Computer Graphic animated film must be created to provide texture, depth to objects and cast shadows like those found in the real world.

As animated scenes become more difficult with millions of objects, furry characters and crowds of thousands in the background, making bulk lighting changes becomes difficult.