Adobe After Effects Wiki
Register
Advertisement

Description

Expressions are quick scripts that can affect modify input values, from the expression itself or another object in AE, and then apply them to a specific Layer property. Expressions can be static throughout time or dynamicly changing as time progresses.

Adding an Expression

To Activate an expression:

  1. Select and expand the layer target layer's properties
  2. Locate a specific property, for example, scale
  3. hold down ALT and left click the little stopwatch near the property
  4. (notice the text box that appears where keyframes should go?)
  5. Activate Expression01
  6. you can delete the default text and substitute a value of your own. 50 for example.

Try the following expressions

[50, 50]
[50+10, 50-10]

x=25;
[50, x]
x=5;
y=60;
[x+y, x-y]
[random(1, 100), 100]
  • remember text values need "text" with quotations, while numeric values need numbers, Also if a property has 2 values, your expression should return 2 values as well.



Examples

For example you may want to may a layer's opacity jitter a bit, so you might

Resources

Advertisement