Summary

Now you know how to create and animate masks. You've played around with fooling Flash into giving your masks a softened edge. You also know how to control a masked layer inside a movie clip using ActionScript. That last technique is actually quite powerful. Knowing that you can script the behavior of a masked layer gives you a lot of options.

Masking is extremely useful in Flash when it's used wisely. Just remember to monitor your CPU usage carefully ” especially with animated masks.