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Chapter 15. Complex Projects > Using Expressions

Using Expressions

Expressions define relationships between layer properties (in the same layer, in different layers, even in layers that reside in different compositions). Rather than keyframe properties independently, you can link the values of one property to another, using a mathematical relationship, or expression. Expressions allow you to create sophisticated relationships between properties that you could otherwise produce only via painstaking keyframing (or by using the Production Bundle's Motion Math feature).

Expressions are especially useful for depicting the parts of a machine: wheels turning as a car moves, a small gear turning in response to a larger gear, a meter increasing in height as a dial is turned (Figure 15.66). Because you can link all kinds of properties using simple or complex formulas, expressions afford endless possibilities. And because you can change the timing of the whole system by modifying a single element, you'll save time and effort as well.


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