In animation, there’s an old saying that animation is easy, it’s the tweening that’s hard. In traditional animation practices established in the 1920s, key frames are drawn by a lead artist, and staff artists draw the in-between frames. This is called inbetweening, or “tweening” for short. Today, computers are often recruited for the work of inbetweening. In the words of Tony DeRose, of Pixar:
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