(hasParent) ? parent.opacity : value;
The parent's opacity value acts as a multiplier for the child's
Constrain wiggle to One Dimension (X or Y). NOTE: Wiggles X dimension. For Y dimension only, change last line to [value[0],w[1]]
Generate a random number
Add a posterize time stop motion effect with the wiggle expression.
AfterEffects_Tricks
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