I was wondering if anyone might know how to make an alpha mask like you might do in After Effects. A good example that I've been trying to replicate with no success is the classic Star Wars transition where you have a circle that gradually gets smaller, until the screen is black.
I know that I can draw a black rectangle and a circle, then scale the circle down but I cant figure out how to cut the circle from the rectangle to create the mask.
I hope I'm making sense.. it would basically be a black rectangle with a scalable transparent circle in the middle that cuts through the black revealing whatever is drawn onto the screen below it.
Any help would be much appreciated. Thanks!!
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