3D animation - Environments

With 3d animation, you can create one environment and then you literally have a world you can travel though on a screen. 

Compare these two clips from The Incredibles and Snow White, in the 3d animated film we can follow Dash through the forest we can see the leaves being pushed aside making it realistic as he's effecting everything he passes. 

In Snow White, because it's 2d we have more of a still environment, there are a few bits where she gets tangled in the branches, and the camera follows her though, but mostly it's just a couple of layers as someone would have had to draw the movement of her reacting with the trees etc frame by frame and change perspective if the camera would have followed behind her like it does with Dash.

But the advantage of computer is that you can chose and pic where the camera goes, you're not just suck with a set background to work with.