The Setup:
Comp 1 is 2000x3000 pixels. Comp 1 contains Layer X that is positioned at 1750,1250. (or whatever)
I pull Comp 1 into Comp 2 which is 800x600. I scale and move Comp 1 inside Comp 2 by an arbitrary amount.
How can I determine Layer X's position using Comp 2's coordinate space?