As your expressions become more complex, you will want to start making decisions in the middle of them – for example, if the current value is less than a certain number, do one thing; if it is greater than that number, do something different. Other decisions include “wait until the current time is past the next marker – then do this animation” or even “don’t freak out and give me an error message if you can’t find the marker, keyframe, or other layer you’re looking for.”
Learning how to craft if/then/else statements plus do/while loops will open the door to a wide range of advanced techniques.
Read this tutorial by clicking here.
via aeportal
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