After Effects Expressions

Thanks for checking out this old Expressions blog!! This was an early test to get the ball rolling on my Expressions training series. It's hard to explain this stuff, so I wanted to kick it around for a while before creating a series on it.The older...

There are some useful terms to learn that we can use to get a great deal of information about a composition, as well as the elements inside the compostion. Please note that all of the examples are CASE SENSITIVE!!
thisComp.height
This returns the height of your comp in pixels. For example, for a NTSC D1 composition, thisComp.height would be equal to 486....

Here's a real example that came up recently that showcases the beauty of expressions. This example involves creating charts that are driven with Expression sliders. In doing so, we'll find some interesting quirks that we'll solve with expressions, that...

In previous topics, we've covered some basic ways to define or modify parameters using After Effects expressions. But let's do something a little more complex to start harnessing the practical side of expressions.
What we discussed in prior topics was how to create some values based on time, or index. But, these values were always absolute. There is nothing telling After Effects that "if this value reaches a certain point, then do something else". This is exactly...