Create Nulls from Paths - 3D help

Question

I've used the Create Nulls from Paths script on a 3D layer shape layer with a path. I have a basic setup where a trim paths is revealing a stroke based on the Progress of the Trace Path param. Shape (path) layer is 3D, Null (created by script) is 2D. Works great.

Problem: I want to attach an arrowhead to the end of the stroke as it is drawn. I parented a shape layer triangle to the Null, but in 3D I can't get it to match position and in 2D the arrow does not respect the camera and does not scale. I was searching for a method to attach a 3D object to a 2D position but no luck so far. I also thought I might hack a 2D arrow and set the scale relative to camera Z. Any tips?

As long as the Null that follows the path is 2D, everything looks great.

beansandporks · Accepted Answer

Dan Ebberts to the rescue. If anyone is looking for a solution to this obscure problem you can find info here:

https://creativecow.net/forums/thread/scaling-a-2d-layer-in-3d-based-on-distance-to-came/

I modified that script and placed it on my 2D arrowhead layer:

factor = 100;
C = thisComp.activeCamera;
L = thisLayer;
d = length(C.position,L.position);
dRef = 1000;
temp = dRef/d*factor;
[temp, temp]

Mylenium · Answer

Pre-compose the shape layer in 2D and create the animation there, then use it as a 3D layer in the parent comp. Mylenium

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