Chris and Trish Meyer post the tenth part of a 12-part series, called “Deeper Modes of Expression”, that comes from the 180+ page bonus chapter in their book Creating Motion Graphics with After Effects, 5th Edition: Essential and Advanced Techniques
“Last month, I discussed using the wonderful wiggle expression to add randomization to your animations. However, wiggle is but one specialized application of random number generation. For those who like take the lid off and truly get under the hood, After Effects also includes the methods random, gaussRandom, and noise. In this installment I’ll also discuss changing random seed values (patterns of randomness), and how to freeze randomness in its tracks.”