Here is my flash masking double attack. A little AS3 variable alpha masking combined with a layer mask. Very cool effect that you can whip up in minutes.
This effect is now possible with SVG and GSAP
Demo: https://codepen.io/snorkltv/pen/rNKGawL?editors=0010
Course: https://www.creativecodingclub.com/courses/svg-animation-with-greensock
