"Interaction with the environment is something I think CG has always struggled with. Before this film, objects in the computer didn't always know where other objects-or even other parts of themselves-were. For example, if Emile, a little chubby rat, were to lie down, his belly would just go right through the ground. We would have to put a 'belly squish' control into the model and squish it manually, frame by frame. For this film, our technical crew came up with a great new collision technology that lets us tell specific objects to look out for each other. Now, when Emile's belly collides with the ground, it automatically squishes again it in a believable way that, in addition to saving a bunch of time, enhances the overall look of the film." Dylan Brown- Supervising Animator page36
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