//load scene one
    function load_sc1() {m_data.load("scene1.json",sc1_loaded_cb);} //has Cube1
	
	//load scene two
    function load_sc2() {m_data.load("scene2.json");} //has Cube2

	//////——–
    function sc1_loaded_cb(data_id) {        
        m_app.enable_controls();
        m_app.enable_camera_controls();         
    }

	//test functions
	function test_one(){ var obj_one = m_scenes.get_object_by_name("Cube1");} //works
	function test_two(){ var obj_two = m_scenes.get_object_by_name("Cube2");} //fails..