ainAdjustmentWhenLoading = true; //避免穿透地形

            //漫游路径
            positions = Cesium.Cartesian3.fromDegreesArrayHeights([
                117.213063, 31.812956, 500, 117.213162, 31.812389, 500, 117.212929, 31.812056, 500, 117.213275, 31.811582, 500,
                117.21348, 31.811513, 500, 117.214141, 31.811682, 500, 117.21497, 31.811691, 500, 117.216318, 31.811454, 500,
                117.216962, 31.812037, 500, 117.217893, 31.812298, 500, 117.218607, 31.811488, 500, 117.2194