How do I combine 3d and 2d animations into a single movie?

Question by Colin: How do I combine 3d and 2d animations into a single movie?
I was wondering how I can combine 3d and 2d animations to make a film. I just want to know how they make a 2d movie and then add 3d spaceships, cars, etc.

Best answer:

Answer by jheat
adobe after effects perhaps?

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