/////////////////////////////////////////////////////////////////////////
	// build a markerRoot
	var markerRoot = new THREE.Group()
	scene.add(markerRoot)

	// build a multiMarkerControls
	var multiMarkerControls = THREEx.ArMultiMarkerControls.fromJSON(arToolkitContext, scene, markerRoot, multiMarkerFile)

	// add an THREEx.ArMarkerHelper to visuable each sub-marker
	var markerHelpers = []
	multiMarkerControls.subMarkersControls.forEach(function(subMarkerControls){
		var markerHelper = new THREEx.ArMarkerH