ctx.clearRect(0, 0, width, height)

function load_cb(data_id, success) 
{
	if (!success) {
		console.log("b4w load failure");
		return;
	}

	m_app.enable_camera_controls();

	var mirino = m_scenes.get_object_by_name ( "Circle" );

    	var from = new Float32Array(3);
    	var to = new Float32Array(3);

	var s1 = m_ctl.create_collision_sensor ( mirino, "cubo" );
	var s2 = m_ctl.create_collision_sensor ( mirino, "cubo02" );

	m_ctl.create_sensor_manifold ( 
        mirino, "IMPACT", m_ctl.CT_CONTINUOUS, [ s1, s2 ],
        function ( sensor_values ) {
            return sensor_values [ 0 ] || sensor_values [ 1 ]; 
        },
        function (obj, id, pulse)  {
            if (pulse == 1)
                document.getElementById ( "dbg" ).innerHTML = "CONTACT";
            else
                document.getElementById ( "dbg" ).innerHTML = "";
        }
    );
}