1 person found this helpful
One easy way to do it would be to use three layers. One for each copy of you and one blank plate. You wouldn't have to make very precise masks around the two of you except for the frames where you cross yourself.
Actually, you can "selectively turn masks on and off". Just set a keyframe for your mask shape, go one frame ahead and move the entire mask out of the comp's viewing area (or outside of the layer's bounding box).
What you are doing is called rotoscoping and this page has a lot of useful information and links to helpful tutorials.
Thanks a lot for the prompt answer!
I can get my two scenes and draw the layers around myself (there is no cross-over, as on Scene A I'm stepping aside the door on purpose - i.e. so that the other myself can pass through without crossing). What mask-type should the two masks that I'll draw on myself (i.e. add, subtract, etc.)? And what should contain the "blank plate" layer and on which scene should I create it? Sorry if I miss some of the terminology here
I'm going through various tutorials trying to learn, thanks a lot for the links. One additional quick question: Do I understand correctly than in Mocha you can only track surfaces defined only by 4 points? I say this because I see that you can define a spline of any shape but it's the actual "surface" you define later on within this spline that is eventually being tracked.
All your Mocha answers should be found here.
Since you're so new, I would highly suggest you go here and follow ALL the links therin. Once you're done with all of it, you will be much less frustrated and have much more fun with AE. It's got a ton of great resources including the spectacular tutorials from VideoCopilot.net.