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Alan Becker: Frank Thomas and Ollie Johnston’s 12 Principles of Animation (and a bit of the beauty of maths)

Alan Becker breaks down key elements of animation from Thomas and Johnston’s Disney Animation: The Illusion of Life. Recommended.

Slow in, Slow Out; or, (Sine) Wave as you Pass

Rule Six (“Slow in, Slow Out”) is a nice articulation of sine-wave movement:

Sine is a natural sway, the epitome of smoothness: it makes circles “circular” in the same way lines make squares “square”.

Better Explained
Source: Wikipedia

See also: Better Explained’s sine-wave simulator and comparison of sine-wave movement vs linear movement – if you haven’t noticed before, marvel at how sine-wave movement in two axes draws a circle.

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