Transparent Gradient Mask in AS3

Creating a gradient mask in AS3 is pretty simple. Just copy and paste this code and you're good to go. First create your two movie clips, one for your mask, the other what's to be masked.

mcContent.cacheAsBitmap = true

mcMask.cacheAsBitmap = true

mcContent.mask = mcMask

There, just like that, transparent gradient masking.