How to get the global/world position of a child object?

Question

How do I get the global position of an Object3D inside another Object3D?

setup:

var parent = new THREE.Object3D();
parent.position.s         


        

Answer 1

In threejs r89 you can just get the world position by Object3D.getWorldPosition. I don't know when it was added.

Answer 2

You can extract the world position like so:

var target = new THREE.Vector3(); // create once an reuse it

child.getWorldPosition( target );

target will contain the result.

EDIT: updated to three.js r.120