Lighting is a very important part of film and animation. It can set the mood of scene and change an environment from dull to spectacular very quickly. Good lighting can be achieved in 2D animation however in 3D Path tracing or Ray tracing light can create astonishingly realistic looking lighting on scenes. This realistic light can make animated landscapes a lot more immersive to the audience. It works by having paths of light which can bounce of objects. Objects depending on there material will reflect/absorb light differently which means the rays of light can bounce an illuminate parts of the scene.
http://nerdist.com/why-does-disneys-3d-animation-look-so-real/ This was an excellent source on how the lighting was done for big hero six. The films lighting looked spectacular and created some very realistic looking animation even on very stylised characters.
This kind of lighting that path tracing achieves is a level of realistic that 2D animation can not reach without an insane attention to detail in every shot where better results could probably be created in 3D much quicker. This would give animators more time to construct the environment and create the world they're trying to present to the audience.
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