Solved:

//This mask expands left to right from a point designated by a slider effect in a seperate null object layer.

var StartPosition_Slider = thisComp.layer(“Write-on_Controller-RectangularMask”).transform.position
var StartPosition_CompSpace = thisComp.layer(“Write-on_Controller-RectangularMask”).toComp(StartPosition_Slider);
var StartPosition =…

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Update:

This version is a lot closer and cleaner, but the start point is still in the wrong place:

//This mask expands left to right from a point designated by a slider effect in a separate null object layer.

var StartPosition_Slider = thisComp.layer(“Write-on_Controller-RectangularMask”).effect(“Start_Point”)(“3D Point”)
var StartPosition_CompSpace…

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Hi there,

I’m working on motion graphics for a documentary that’s going need to a lot of expanding masks.

I thought I’d try and save a little time by writing a script that would create mask paths based on the position value of a null.

Surely someone has written exactly this script before, and I’d see the answer right in front of me if I understood…

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