skybox.json

{
  "assets": [
      { "id": "cityModel", "src": "https://xrpanet.s3-us-west-1.amazonaws.com/skybox/scene.gltf"}
  ],
  "entities": [
      { "id":"city", "gltf-model": "#cityModel"},
      { "id":"light", "light":"color: #FFF; intensity: 10", "position":"-1 1 0"}
  ]
}