itProfile()
	artoolkitProfile.sourceWebcam()

	var arToolkitSource = new THREEx.ArToolkitSource(artoolkitProfile.sourceParameters)

	arToolkitSource.init(function onReady(){
		onResize()
	})

	// handle resize
	window.addEventListener('resize', function(){
		onResize()
	})
	function onResize(){
		arToolkitSource.onResize()
		arToolkitSource.copySizeTo(renderer.domElement)
		if( urlOptions.trackingBackend === 'artoolkit' ){
			if( arToolkitContext.arController !== null ){
				arToolkitSource.copySizeTo(arToo