Path point linked to null position

[matteociaociao]

i have a simple expression that links the first point of the shape lazer to a null.

createPath(points = [thisComp.layer("Null 20").transform.position-[960,540], [100,0], [100,100]], inTangents = [], outTangents = [], is_closed = false)

this works untill i move the position of the shape layer. is there a way to tweek this simple expression to make it work even if i move the shape layer?

i am thinking about a toComp command but i dont know how to put it in.

i am also aware of the "Create Nulls From Path.jsx" but i dont want to use it now, i want to keep it simple.

thanks!

[Dan Ebberts · Accepted solution]

Try it this way:

createPath([fromComp(thisComp.layer("Null 20").transform.position),[100,0],[100,100]],[],[],false)

Dan

[matteociaociao]

ehi dan, thanks a lot for the help it works perfectly!

but now i was trying to make it work even if the null is 3d, any idea?

thanks!

i am doing this just to learn some expressions, i still have a long way to go

[Dan Ebberts]

Try this:

N = thisComp.layer("Null 20");

createPath([fromComp(N.toComp(N.anchorPoint)),[100,0],[100,100]],[],[],false)

Dan

[Tomas B. aka Tom10]

Hey Matteo, considering how Create Nulls From Path.jsx works - its either points follow nulls, or vice versa.

With this in mind - can you explain the reason why you might want to move it separately? As a different workaround, you could have all points controlled by nulls and when position change is needed, just animate them all.

Unless someone has a solution to pull this through with the parenting null position to shape in a proper way. Cheers.

Edit: based on Dan's response, I kind of imagined it is required that null follows the shape like no path controller is applied, instead of pinning to that initial point.