This After Effects Expressions Technique Changes Everything

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Ever wanted a layer to follow its parent chain's transformations, but NOT their rotation? Standard parenting in After Effects links everything together, but with a few lines of expressions, we can unlink the rotation to keep layers perfectly upright no matter how much the parent (or its parents) rotates.

In this tutorial, I’ll show you an awesome technique for using a while loop expression that counteracts full parent chains of rotation.

The Expression Code: Copy and paste this into the Rotation property of your layer:

var totalParentRotation = 0;
var currentLayer = thisLayer;

while(currentLayer.hasParent) {
currentLayer = currentLayer.parent;
totalParentRotation += currentLayer.rotation;
}

value - totalParentRotation;

How it works:

The Loop: We use a while loop to climb up the parenting chain.

The Accumulator: We add up the rotation values of every parent, grandparent, etc.

The Calculation: We subtract that total from the current layer to stabilize it (Counter-Rotation).

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Chapters
00:00 Intro
00:50 What this technique does
02:07 Rig Walkthrough
02:44 The simple Way
04:17 Project Setup
05:00 Defining Variables
07:15 Writing a While Loop
08:09 The Condition
08:52 Redefining Variables
11:47 The Final Expression
13:33 Making the Expression Flexible
14:39 Applying the Expression to Other Layers
15:28 Applying Expression with Code Runner
15:39 Code Runner
16:53 Balancing Shapes Example
17:46 Chain Links Example