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Chapter 3. Principles of Animation > Slow In and Slow Out on the Web

Slow In and Slow Out on the Web

When objects in the real world begin to move, or when they come to rest, they experience a natural acceleration or deceleration. In animation, this is called slow out and slow in, respectively. The terms refer specifically to a character's slowly moving out of a pose or slowly moving in to a pose. In many computer animation programs, gradual building of speed or coming to rest are called ease out and ease in. Traditional animators learned to exaggerate this effect to emphasize the extreme poses of characters and sometimes even added a hold on a character, to freeze it in a particular pose for a certain number of frames.

Given the same force, heavy objects accelerate more slowly than do light objects, which means that slow in and slow out are ways to show an object's weight. Objects animated without slow in and slow out appear to be weightless and propelled by an all-powerful machine, as though they were on a conveyor belt that is suddenly kicked into gear.


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