Join Chris Meyer for an in-depth discussion in this video Creating an expression, part of After Effects Apprentice 09: Expressions.
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If you haven't already, revert back to a clean version of your…AEA_expressions.aep project and open up the comp 01-Pick Whip*starter. Again, we…have the blue pulley already animating. I'm pressing U to reveal its keyframes,…and I'll press 0 on the numeric keypad to RAM Preview.…We want the red pulley to perform this exact animation, at least for now.…And rather than copying and pasting keyframes, let me show you another way.…I am going to click on the red pulley, press S to reveal the Scale and Shift+R to…reveal its rotation.…
Instead of just clicking on the animation stopwatch for Scale to enable it,…instead I am going to hold Option on Mac, or Alt on Windows, then click on its scale.…Rather than enabling keyframing, this enables expressions.…I am going to drag this column a little bit wider, so see what's going on, and you…can see this new line that says expression for Scale.…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 this layer,…
The After Effects Apprentice videos on lynda.com were created by Trish and Chris Meyer and are designed to be used on their own and as a companion to their book After Effects Apprentice. We are honored to host these tutorials in the lynda.com Online Training Library®.
- Creating and managing expressions
- Linking together different parameters
- Randomizing a layer's movement
- Looping an animation
- Controlling multiple layers from a single source