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Expressions are one of the most powerful but underused features in After Effects. They can be used to animate layer properties with code, as compared to explicitly keyframing every value in the Timeline, and have multiple parameters and layers that follow the lead of a master layer or controller effect, making it much easier to coordinate complex animations and quickly accommodate client changes. In this introduction, Chris Meyer shows how to let After Effects do most of the work by creating simple but very useful expressions that can be put to work on a wide variety of jobs.
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®.
Hi, I am Chris Meyer of Crish Design, and welcome to the After Effects Apprentice lesson on expressions. Now, normally the way you animate a layer in After Effects is you use keyframing, where you say at this time, this parameter takes on this value. You set up multiple keyframes across time and After Effects will interpolate in between them for you. When it comes time to change the animation, you need to change the keyframes. However, there is another approach, where you give After Effects more general instructions, such as this layer should follow what that layer is doing, but only do it half as much. Well, that's what expressions are, and they come in extremely handy when you are trying to coordinate the movements of multiple parameters, or multiple layers, or trying to accommodate client changes on a deadline.
So in this lesson I am going to be showing you these introductory expressions that I think you will find very useful. In this lesson, I'll be covering how to create and manage expressions, how to indeed use that simple elementary school math to modify them; how to take advantage of our three favorite intermediate-level expressions of linear interpolation, looping, and wiggle; how to set up a user interface for your expressions, how to set up master controls where one set of sliders can control multiple layers; and how to drive your animations via sound. We'll also have our usual list of Quizzler challenges and Idea Corners of how you can put these expressions to use.
So, let's dive in and have some fun.
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