{"asset": {        "version": "0.0",        "gltfUpAxis": "Y"    },    "geometricError":100.000000,"root": {        "transform": [-0.951465,-0.307757,0.000000,0.000000,0.114996,-0.355522,0.927567,0.000000,-0.285196,0.881715,0.375822,0.000000,-1819879.174210,5626360.106935,2382120.915173,1],    "boundingVolume": {    "region": [1.883628,0.385280,1.883634,0.385286,0.000000,2.424052]},"geometricError": 100.000000,        "refine": "REPLACE",        "content": {        "uri": "./tile/6/21/50.b3dm"}}}