let layerId = reearth.layers.add({
  type: "simple",
  data: {
    type: "3dtiles",
    url: "https://assets.cms.plateau.reearth.io/assets/11/6d05db-ed47-4f88-b565-9eb385b1ebb0/13100_tokyo23-ku_2022_3dtiles%20_1_1_op_bldg_13101_chiyoda-ku_lod1/tileset.json",
  },
  "3dtiles": {
      pbr: false
  }
});

setTimeout(()=>{
    reearth.camera.flyTo(layerId);

    reearth.scene.overrideProperty({
        atmosphere:{
            shadows: true,
            shadowResolution: 4096,
            softShadow: true,
            shadowDarkness: 0.3
        },
        terrain:{
            terrain: true,
        },
        light:{
            lightType: 'directionalLight', // in case you test this at night
        }
    });
},0);