Introduction.
Expressions.
“When you want to create and link complex animations, but need to avoid creating tens or hundreds of keyframes by hand, try using expressions. An expression is a piece of software – much like a script – that evaluates to a single value for a single layer property at a specific point in time. whereas scripts tell an application to do something, an expression says that a property is something.”
Wiggle expression.
One example of an expression in after effects is the wiggle expression – which makes an object (which has a position that can be animated) move and wiggle around the screen.
To use the wiggle expression, you type:
wiggle(freq,amp) – you need to replace freq and amp with a value.
Frequency (freq) – how often do you want your value (number) to move per second. It gives the shape a ‘jittering’ and ‘vibrating’ effect.
Amplietude (amp) – how much your value is allowed to change above or below the starting line.
for example, wiggle(10,50) would move an object 10 times in a second, with a value of 50.
here is a simple animation i created in after effects using the wiggle() and loopOut() expressions.
here is an assetthat i drew in photoshop and animated in after effects using the wiggle expression. it is based on the bug enemies from the gme hollow knight.