I am trying use the three lines as a subtractive mask for the circle. Each line is it's own layer that animates over the circle.
What I tried:
1.) Using TrkMat to mask the one of the lines. (this only works for one layer at a time)
2.) Used the 'Set Matte' effect on all the line layers. This almost works, but I can use it to subtract the background like a subtractive mask would.
How can I get this to work?