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loopOut and loopIn expression methods

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Most people don't know about the loopOut and loopIn expression methods...
After Effects CS3
Useful things

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...which allow you to tell After Effects to loop or continue an animation in many different ways. The details about loopIn and loopOut are in After Effects Help, but an infomographic is worth a gazillion words.

by Todd Kopriva

loopIn(type="cycle", numKeyframes=0)
loopOut(type="cycle", numKeyframes=0)
loopInDuration(type="cycle", duration=0)
loopOutDuration(type="cycle", duration=0)

cycle: (default) Repeats the specified segment.

pingpong: Repeats the specified segment, alternating between forward and backward.

offset: Repeats the specified segment, but offsets each cycle by the difference in the value of the property at the start and end of the segment, multiplied by the number of times the segment has looped.

continue: Does not repeat the specified segment, but continues to animate a property based on the velocity at the first or last keyframe. For example, if the last keyframe of a Scale property of a layer is 100%, the layer continues to scale from 100% to the Out point, instead of looping directly back to the Out point. This type does not accept a keyframes or duration argument.

(Min. Version: After Effects CS3, Category: Useful things, Type: Expressions)
posted by MicGyver on Jul 12, 2009


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