Join Chris Meyer for an in-depth discussion in this video Creating an expression, part of After Effects Apprentice 09: Expressions.
- [Instructor] If you haven't already, revert back…to a clean version of your AEAExpressions.AEP project…and open up the comp 01equipstarter.…Again, we have the blue pulley already animating,…pressing U to reveal key frames, and I'll press zero…on the keypad ram preview.…We want the red pulley to perform this exact animation,…at least for now.…And rather than copying and pasting key frames,…let me show you another way.…I'm going to click on the red pulley, press S to reveal scale,…and shift + R reveals rotation.…
Instead of just clicking on the animation stopwatch…for scale to enable it, instead I'm going to hold option…on Mac, or Alt on Windows, then click on that scale.…Rather than enabling key framing, this enables expressions.…I'm going to drag this column a little bit wider so we can see…what's going on and you can see this new line that says…expression for scale.…Now After Effects has already written a little bit…of code for us, it says use the transform property…of scale to be the scale of the slayer.…
The After Effects Apprentice series was created by Trish and Chris Meyer. These tutorials are designed for After Effects CS4 through CC, and can be used on their own or as a companion to the Meyer's book, After Effects Apprentice.
- Creating and managing expressions
- Linking together different parameters
- Randomizing a layer's movement
- Looping an animation
- Controlling multiple layers from a single source