code: function getWorldPosition(obj) {
  	obj.updateMatrixWorld();
  	var vec = new THREE.Vector3();
  	vec.setFromMatrixPosition(obj.matrixWorld);
  	return vec;
  }
docs: idea: API for symbolic camera from altspace? altspace.getThreeJSCenterCamera(); idea: offset (drag from bottom of piece). Workaround if you reparent TODO: GSAP Draggable