Not sure if this is possible. I have a white solid I'm using as an alpha channel for a painful rotoing job. I have several masks and would like to name them 1-160 (there are 160 frames in this comp) and have the expression say if the timeline is at 50 frames, then Mask 50 will be 100% opacity and zero before and after.
The manual expression I'm using now is-- Mask name is "50" and the opacity of the mask is as follows
I'm trying to avoid changing the value of F for every mask. I'd rather just name it and have F pull the Mask name so I can just duplicate or cut/paste the expression without modifying it. Is this even possible?