I'm trying to do a simple setup so that every time I move a layer, a mask path animates.
I know that the problem (at least for my newbieness) about mask path is that there's no changeable value like any other properties, so I tried to use index key to set a linear expression.
It doesn't work because the error says "Path object found where a number array or property is needed".
This is not urgent , I can skip this things by simply animating mask keyframes, but I don't know how to do that, and that drives me crazy.
If anybody can help me, well... Thank you in advice!
var A = thisComp.layer("layer").transform.position;
Mmh, no I'm sorry, it doesn't work.
I thought it was a issue with the inPoint of each layer, so I tried to add a var T= time - (thisComp.layer("layer").inPoint + inPoint) but then the expression becomes incorrect...