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Bounce/Jump

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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
Expressions

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share this  error? 
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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