Here's a simple example that creates a null for each mask vertex. It assumes:
- The layer with the mask is the first layer in the active comp
- The number of mask vertices doesn't change
- The layer isn't parented, rotated, or 3D
{
var myComp = app.project.activeItem;
var myLayer = myComp.layer(1);
var myPath = myLayer.property("Masks").property("Mask 1").property("Mask Path");
var numVerts = myPath.valueAtTime(myLayer.inPoint,false).vertices.length;
var myNulls = [];
var myNull;
var myVerts = [];
// create nulls
for (var i = 0; i < numVerts; i++){
myNull = myComp.layers.addNull(myComp.duration);
myNull.name = "Vertex " + (i+1);
myNulls[i] = myNull;
}
var t = myLayer.inPoint;
var p;
while (t <= myLayer.outPoint){
myVerts = myPath.valueAtTime(t,false).vertices;
p = myLayer.property("Position").valueAtTime(t,false) -
myLayer.property("Anchor Point").valueAtTime(t,false);
for (var i = 0; i < numVerts; i++){
myNulls[i].property("Position").setValueAtTime(t,p + myVerts[i]);
}
t += myComp.frameDuration;
}
}
It gets a bit more complicated if you're dealing with parenting, rotation and/or 3D. You may need to temporarily add a Point Control with a layer space transform expression to do the space conversion and harvest the result.
Dan
