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Creates a bouncing (sine wave) motion between two specified 2-dimensional positions over a
specified period of time (in seconds). Useful for creating bouncing balls.
After Effects 7
Useful things

Views: 10279
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Use Expression Control position points for "from", "to, and an Expression Control slider
assigned to "period" for fine control. You can apply these to any layer.
by Michael Natkin & Brian Maffitt
surface = [320, 480]; //the position of the "bounce" surface
apogee = [320, 50]; //the "apogee" of the bounce
period = 1.5; //the length of time from surface to apogee
t = time % (period * 2);
if (t > period) t = 2 * period - t;
linear(Math.sin(t * Math.PI / period), 0, 1, surface, apogee)

(Min. Version: After Effects 7, Category: Useful things, Type: Expressions)
posted by MaxX on Jan 11, 2009


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