Not only can you adjust the amplitude, frequency, and decay of the wiggle expression, you can also adjust them on many other expressions. What does each mean? How can you use them to customize the animation an expression controls? Author Luisa Winters explains how to use amplitude, frequency, and decay in an expression in Adobe After Effects.
- As we probably remember from WEGO,…amplitude is how much of the value we are affecting.…In this case, we will be referring to a sine wave.…So the amplitude would be the height of the wave,…which, if you remember from the graph editor,…means how much of the value.…So whether we are talking about the height of a wave…or how much of a value, don't worry,…they are both the same thing.…
Frequency is almost self-explanatory.…It is how often we will change the value.…In the case of a wave, it means…how many peaks and valleys we will have.…Decay is a new element that we are introducing…so that the peaks and the valleys become…less and less as time goes by until the wave,…which really means the change in value, stops.…Let's try that.…
Go ahead and open Composition 5.3:…Amplitude, Frequency, and Decay.…Now, we see a red bar there, and we see…two other layers, which are invisible right now.…Let's go ahead and select the Red Bar layer…and add an expression to the rotation.…So R for rotation, and add the expression.…The expression should read like so.…
- Adding expressions
- Editing expressions manually
- Changing expression dimensions: rate, value, music amplitude, etc.
- Working with expression variables
- Using the Expression Language menu
- Using random values
Skill Level Intermediate
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1. What Are Expressions?
2. Expression Dimensions
4. Expression Language Menu
5. Other Expressions
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