Expressions - Adobe After Effects 2020 (Part 6)

Expressions are little pieces of code or script that allow you to randomize or controll certain parameters.

Simple expressions for Adobe After Effects
Alt+Click on the Animate Button (Stopwatch) activates expressions)
wiggle(x,y)
generates a random change in values. x is the frequency (how many time per second) y is the amplitude (how far does the change of values go)
The random value for wiggle will be generated from the layers position in the composition. for changing the random value use the command
seedRandom(x)
before the wiggle expression. example: seedRandom(4);wiggle(0.5,10)

time puts the time as a value in a field. You can multiply or divide time (time*3 or time/2) to make it count faster or slower. an offset can be achieved by adding or subtracting to the time (time-5 or time+3)

random()
returns a random number. random(2,5) returns a random number min 2 and max 5

Math.round()
Converts a decimal number into an integer. Math.round(random(100,200)) would produce a random number eg. 146,45027381 Math.round drops the decimals and returns 146

loopOut("cycle")
repeats whatever animation has been applied to a specific value all the way to the end of the composition.

slider control
not an expression. a simple trick to animate a value using a slider. use a "slider control" effect and link it to the value that you want to animate.

Animate - Character Offset
Add animate and Character offset to animate changing text. The Character Offset defines, how much the value of a character changes. To get random character use wiggle.

Add - Repeater
Adds multiple copies of an object. Only works with shapes on a shape layer. Both numbers and offset of the copies can be animated.

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