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# Better Bouncing

It's similar to Ease and Wizz - but with sliders to adjust amplitude, decay, and frequency.
After Effects CS4
Useful things
Presets (ffx)

Views: 15232
There are sliders to adjust amplitude, decay, and frequency. By tweaking these you'll be able to achieve a variety of effects.

Based on Dan Ebberts articles on physical simulations. Check out what Dan has to say about choosing the frequency: "Note that you need to choose your frequency carefully to sell this effect. For example, at 30 frames per second, a frequency of 2.0 will cause the first bounce to occur half way between frames 3 and 4. So it will look like the ball never quite hits the "floor". To have it occur exactly at frame 3, you would need to change your frequency to 2.5, and to make it occur at frame 4, you'd change the frequency to 1.875."

To build it up on your own add the 3 sliders and apply this expression on a "Separate Dimensions" position value
``````    try {
freq = effect("bounce - frequency")("Slider"); //oscillations per second
amplitude =  effect("bounce - amplitude")("Slider");
decay =  effect("bounce - decay")("Slider");
} catch(e) {
freq = 1;
amplitude = 500;
decay = 1;
}

posCos = Math.abs(Math.cos(freq*time*2*Math.PI));
y = amplitude*posCos/Math.exp(decay*time);
value - y``````
by Ian Haigh

### Keywords

bounce, gravity, expression, preset, ffx

(Min. Version: After Effects CS4, Category: Useful things, Type: Presets (ffx))
posted by jamie on Nov 02, 2011

# Quick Gravity - BatchFrame

Use Quick Gravity to add a falling and bouncing effect to a layer or layers in your composition quickly and easily.
After Effects CS4
Useful things
Presets (ffx)

Views: 10190
posted by MicGyver on Jul 18, 2011

# Object bouncing on a floor

This will make your layer/object bounce along an imaginary 'floor'. Paste it into the 'position' attribute for your layer.
After Effects 6
Design/Objects
Expressions

Views: 6708
posted by MicGyver on Sep 15, 2008

# Rebel CC

A simple, elegant, telecine-style color-correction tool for coloring or grading your movie.
After Effects 7
Color
Presets (ffx)

Views: 13699
posted by MicGyver on Nov 06, 2008