Link one object's property to another
Make a shape follow, match, or track another object every frame.
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Overview
Keyframes are great when you know in advance what a value should be at a given time. Sometimes you don't — you want one object to always sit next to another, or always match its opacity, no matter how the source object ends up moving. That's what a variable link (a "binding") does: it drives one property on an object from another object's value, recomputed every frame, for as long as the project plays.
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