How to Loop an Animation in After Effects: loopOut();

Having manually keyframed a property for a period of time, it's easy to have After Effects repeat that animation along the entire length of the timeline. Details below...
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An expression needs to be added to the keyframed property.

Hold down Alt/Option and click on the stopwatch icon next to a property such as Position or Scale. This will open an area where expressions can be entered. Ensure that any default text is removed and type in...

loopOut();

There are 4 types of loopOut()...
  loopOut("cycle")
  loopOut("continue")
  loopOut("offset")
  loopOut("pingpong")

If a type is not specified, as in loopOut(), the expression will default to loopOut("cycle").

loopOut() = loopOut("cycle")




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