{"asset": {        "version": "0.0",        "gltfUpAxis": "Y"    },    "geometricError":100.000000,"root": {        "transform": [-0.950427,-0.310949,0.000000,0.000000,0.114429,-0.349756,0.929826,0.000000,-0.288864,0.882924,0.370140,0.000000,-1843259.697137,5633991.449980,2346075.649457,1],    "boundingVolume": {    "region": [1.886913,0.379120,1.887062,0.379199,0.000000,23.640720]},"geometricError": 100.000000,        "refine": "REPLACE",        "content": {        "uri": "./tile/5/21/16_4560.b3dm"}}}