ts.update();
            requestAnimationFrame(animation);
        }


        function initGui() {
            var params = {
                add: true,
                color: material.color.getStyle(),
                show: true,
                opacity: material.opacity,
                altitude: 0
            };
            var gui = new dat.GUI();
            gui.add(params, 'add').onChange(function () {
                if (params.add) {
                    threeLayer.addMesh(lineTrails);
             