{"asset": {        "version": "0.0",        "gltfUpAxis": "Y"    },    "geometricError":100.000000,"root": {        "transform": [-0.950750,-0.309958,0.000000,0.000000,0.173033,-0.530753,0.829675,0.000000,-0.256624,0.787157,0.560828,0.000000,-1638511.365880,5025889.075591,3556836.954458,1],    "boundingVolume": {    "region": [1.885887,0.595328,1.886003,0.595442,0.000000,8.776296]},"geometricError": 100.000000,        "refine": "REPLACE",        "content": {        "uri": "./tile/4/6/9_1448650.b3dm"}}}