How to combine position and anchor point into an expression? Or get the absolute path of null?

[devgohan]

I have a null that has a bunch of position values in x and y space and an anchor point that moves it through z space (with some x and y to help with that). I'm trying to get the absolute position of this so that I can add this position to a Light (that doesn't have an anchor point). Is there a way to use an expression to get the absolute position of this null?

I tried to do this expression in the Light: thisComp.layer("Motion Path 1 Null").transform.position + thisComp.layer("Motion Path 1 Null").transform.anchorPoint

However this flips and flops the motion path. It seems just adding the anchor point to the position doesn't work. What is the correct way to do this math? Or is there just some sort of way to combine the anchor point into the position so I can have the position itself moving through z space?

[Mike_Abbott · Accepted solution]

How about this expression on the position property of your light:

N = thisComp.layer("Motion Path 1 Null");

N.toWorld([0,0,0])