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
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