wiggle expression y axis only after effects

This is a lot faster than tediously animating the media item back and forth, or continually lowering the opacity or scale.Īs noted in the examples above, although the wiggle expression is usually applied to an object’s position, there are numerous applications for the wiggle expression. With that covered, what about in the case of the wiggle expression? With a wiggle, we’re instructing the property, whether the scale, opacity, or position, to wiggle within the set parameters. An example of a script-not an expression. For example, this script tells the application (the application being After Effects) to position the anchor point of this layer to the center, the right, or the top. Now, unlike a script, which tells the application to do something, an expression will inform the individual property to do something. Also, notice how when I apply syntax highlighting by showing this code how an editor would see it, the 'var' text is a different color letting you easily see what your variables are.First, before we look at what the wiggle expression does, we must ask: What is an expression? An expression is a piece of JavaScript code that you can insert into the animated properties of your media. Also, you don't have to write 'var' before each of your variables, but it's good practice for clarity, and is technically the proper way to write code when declaring variables. Value will take the existing value, so you're telling AE to not touch your child dots' x=positions, and only alter the y-positions.

You don't have to declare a variable of x, you could just write 'value' in the x position of the array, but this is cleaner. You can easily fix this by writing this as your final few lines. Which means it's going the position is going to be the same for X as it is for Y. Position is an array, so it wants an value returned to it.īy not providing a specific array you're having your expression 'p.position.valueAtTime(t) ' actually feed AE this data: Then you can apply the master's keyframes just to the Y-Position, then apply the expressions to the children's Y-Positions, and your current expression should work.Īlternatively, the reason you're getting an error is because you're not feeding AE what it needs.

You can separate your child dots position dimensions by right-clicking on 'Position' and choosing the command.

Wiggle expression y axis only after effects