{"asset": {        "version": "0.0",        "gltfUpAxis": "Y"    },    "geometricError":100.000000,"root": {        "transform": [-0.949131,-0.314881,0.000000,0.000000,0.116097,-0.349946,0.929548,0.000000,-0.292429,0.881453,0.370845,0.000000,-1866008.960170,5624617.283330,2350550.205060,1],    "boundingVolume": {    "region": [1.891074,0.379861,1.891182,0.379977,0.000000,71.292590]},"geometricError": 100.000000,        "refine": "REPLACE",        "content": {        "uri": "./tile/5/15/21_646.b3dm"}}}