Expression basics search after effects user guide select an article on this page about expressions when you convert an expression to keyframes after effects evaluates the expression creating a keyframe at every frame and then disables the expression. Expressions can really change the way you work within after effects if you want to get serious about it you can start writing your own expressions to do all kinds of things for you but you can also start building a library of simple expressions like the ones above to be more efficient and give you more creative control over your work. This expression uses the fromworld method which makes the expression work correctly regardless of whether you move the magnifying glass layer or the underlying layer you can rotate or scale the underlying layer and the expression stays intact you can also use other effects such as ripple with this expression. The best 10 after effects expressions loop expression is probably to most used after effects expression it allows you to repeat your animation forever with code tweak you can also control the loop time and repetitions loopoutcycle download the loop expression example here. The wiggle expression is by far the expression that i use the most in after effects wiggle expressions do exactly what you might imagine they wiggle an object across random values this expression can be used to make your scene seem more organic and natural
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