        altitude: 0
            };
            var gui = new dat.GUI();
            gui.add(params, 'baseLayer').onChange(function () {
                baseLayer[params.baseLayer ? 'show' : 'hide']();
            });
            gui.add(params, 'add').onChange(function () {
                if (params.add) {
                    threeLayer.addMesh(getTerrains());
                } else {
                    threeLayer.removeMesh(getTerrains());
                }
            });
            // gui.addColor(par