Parenting objects in Adobe After Effects is handy when we need to create an animation where elements in the scene interact with each other. It makes the work easier.
With parenting, you can have one layer take control of any other layer or a group of layers inside of our composition. Parenting allows us to link layers together and to copy parameters between them.
So in this quick tip, I will show you how to maintain the scale of a parented element in our composition with a simple expression from Dan Ebberts. Let’s dive in!
For this example, I have a straightforward set up in my After Effects.
I have two elements inside of my composition. I have The Ukramedia.com text layer and the circular shape layer.
By the way, my Ukramedia.com text layer is also parented to the circular shape layer. What that means is that when I move the position of the circular shape layer on the x and y-axis, the Ukramedia.com text layer moves with it as well.
The same thing goes for the scale and for the rotation properties, which is great!
However, what if I did not want our Ukramedia.com text later to scale up with my parent? How do I make that happen? Great question! That’s when Expressions come handy! Let me show you how.
Applying Dan Ebberts Expression Script
Step 1: Reveal the Scale Property
First, I am going to select the Ukramedia.com text layer, hit S to reveal the scale property.
Step 2: Activating Expressions in After Effects
Next, ALT+LEFT CLICK on the stopwatch icon to activate the expression.
Step 3: Insert Dan Ebberts Expression Script
Lastly, copy and paste Dan Ebberts expression script below into the white box in After Effects:
s = [];
ps = parent.transform.scale.value;
for (i = 0; i < ps.length; i++){
s[i] = value[i]*100/ps[i];
}
s.
This script has been created by Dan Ebberts from http://motionscript.com/. Motion Script is a great online resource for After Efter Effects Expressions and Scripting.
Now when you select the Logo Outlines shape layer and scale it, you will notice that our Ukramedia.com text layer will remain in the same spot.
The same thing applies to the scale and the rotation properties. That simple!
I hope you found this After Effects Tip useful. I put together a 12+ hour course that covers the basics of After Effects Expressions.
Understanding the core of Expressions will give you a very strong foundation to build on. Contrary to popular belief, you don’t need to be great at math and you don’t need to know everything about Expressions in order to be good at it. Just like you don’t need to know everything about a car to be a good driver. You just have to know the basics and for everything else, we have tools and resources to lean on. Check it out!
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