How to

Get a 2D comp pos from a 2d pos in a transformed 3d comp

L1 = comp(“the 3d comp”).layer(“the nested null”);

P = L1.toWorld(L1.anchorPoint);

L2 = thisComp.layer(“the 3d comp”);

L2.toComp(P);

( thanks to Dan Ebberts  at motionscript.com )

Get a 2D comp pos from a 3d pos

l = thisComp.layer(“a3DNull”);

l.toComp(l.anchorPoint);

Create an animation preset

1. Select the Effects to include
2. Ctrl select the property with expression ( if you have some )
3. Animation > Save Animation Preset

Get the world position from a nested null

pRef=thisComp.layer(“Null”); pW=pRef.toWorld(anchorPoint);

Offset value in time

If you want to offset a value in time simply use the “valueAtTime” function. For instance if you want to use the position information of “Null 1″ but offset that value by 1 second you can use the following expression:

thisComp.layer(“Null 1″).transform.position.valueAtTime(time-1);

To make it half the speed you can use this expression:

thisComp.layer("Null 1").transform.position.valueAtTime(time*.5);