I'm new to After Effects and I would like to know how to use a Mask properly.
I have an intro that I want to haver transition to a piece of footage via circular motion starting from a circle that appears at the end of the intro and grows to engulf the whole screen. I'm under the impression that a mask will do the job just fine but the only problem is I can't seem to animate it for the life of me, there are no scale options availible and as such I'm confused as to how to proceed.
I would also like to know if this effect would transition if I brought the footage into another project (in other words, does opacity function across rendering and importing), and how would I make a transition that fades the whole screen?
Help would be awesome.