////////////////////////////////////////////////////////////////////////////////
	//          handle arToolkitSource
	////////////////////////////////////////////////////////////////////////////////

	var arToolkitSource = new THREEx.ArToolkitSource({
		// to read from the webcam
		// sourceType : 'webcam',

		// to read from an image
		// sourceType : 'image',
		// sourceUrl : THREEx.ArToolkitContext.baseURL + '../data/images/img.jpg',

		// to read from a video
		sourceType : 'video',
		sourceUrl : THREEx