[3D tiles] Request on Cesium OSM Buildings dataset returns only the root tile

[tdurand]

Hello,

Problem

I am experimenting with 3D tiles and looking to build a simple visualization of some OSM buildings with the Cesium dataset.

I try to request 3D tile with loaders.gl for some viewport, but for some reason it does only return the root tile with the Cesium dataset, I tried the same code using the Google 3D tiles and I get 53 tiles of the building on that location. (which is the centered in the statue of liberty in New York)

Any idea why this could happen ? I tried with other location and others zoom level and have the same problem.. I am unable to fetch tiles for this dataset.

Thanks a lot for any pointer 🙏

Sample code

const tilesetJson = await load(
    cesiumCredentials.url,
    Tiles3DLoader,
    {
      '3d-tiles': {
        loadGLTF: true,
        isTileset: true
      },
      fetch: {
        headers: {
          Authorization: `Bearer ${cesiumCredentials.accessToken}`
        }
      }
    }
  );

  const tileset3d = new Tileset3D(tilesetJson, {
    throttleRequests: false,
    maximumScreenSpaceError: 8,
    loadOptions: {
      fetch: {
        headers: {
          Authorization: `Bearer ${cesiumCredentials.accessToken}`
        }
      }
    }
  })

  const viewportToLoad = new WebMercatorViewport({
    width: 230,
    height: 175,
    latitude: 40.6891,
    longitude: -74.0446,
    zoom: 16
  });

  while (!tileset3d.isLoaded()) {
    await tileset3d.selectTiles(viewportToLoad)
  }

console.log(tileset3d.tiles.length)
// with Cesium OSM buildings tileset.json : just one tile loaded , the root tile
// with Google Map 3D tiles: 53 tiles loaded

More Details

In the network tab of my browser, two requests are made

• One to get the tileset.json
• One to get the root.b3dm (which is the tile loaded)

From my understanding of the 3D tiles specification , what is wrong is that it does not try to go through the tree and load the children tiles of the tileset.json to get down to the detailed tiles that are in my viewport

for reference, here is the root tileset.json .. ( in my understanding it should go and fetch "0-0-0.json" and so on until it reach a geometric error acceptable)

{
    "asset": {
        "version": "1.0",
        "tilesetVersion": "57181480-e706-11ee-857d-e18e4a3674dc",
        "extras": {
            "ion": {
                "defaultStyle": {
                    "color": "Boolean(${feature['cesium#color']}) ? color(${feature['cesium#color']}) : color('#ffffff')"
                },
                "terrainId": 1,
                "georeferenced": true,
                "movable": false
            }
        }
    },
    "properties": {
        "elementType": {},
        "elementId": {},
        "cesium#color": {},
        "cesium#estimatedHeight": {
            "maximum": 1102,
            "minimum": -16
        },
        "building": {},
        "shop": {},
        "source": {},
        "name": {},
        "wheelchair": {},
        "access": {}
    },
    "extensionsUsed": [
        "3DTILES_batch_table_hierarchy"
    ],
    "geometricError": 154134.67955991725,
    "root": {
        "geometricError": 77067.33977995862,
        "boundingVolume": {
            "region": [
                -3.1415925942485985,
                -1.4599681618940228,
                3.141545370875028,
                1.4502639200680947,
                -385.0565011513918,
                5967.300616082603
            ]
        },
        "content": {
            "uri": "root.b3dm"
        },
        "children": [
            {
                "geometricError": 77067.33977995862,
                "boundingVolume": {
                    "region": [
                        -3.1415925942485985,
                        -1.4599681618940228,
                        0.00003951949025290761,
                        1.4502639200680947,
                        -165.10238794752343,
                        5915.2067650589615
                    ]
                },
                "content": {
                    "uri": "0-0-0.json"
                }
            },
            {
                "geometricError": 77067.33977995862,
                "boundingVolume": {
                    "region": [
                        -0.00003125012025695847,
                        -1.4035456116211558,
                        3.141545370875028,
                        1.4277331959733954,
                        -385.0565011513918,
                        5967.300616082603
                    ]
                },
                "content": {
                    "uri": "0-1-0.json"
                }
            }
        ],
        "refine": "ADD"
    }
}

[tdurand]

Following up on this, I did tried the same code (changing the location) with another 3D tiles dataset from Strasbourg in France : https://s3.eu-west-2.wasabisys.com/ems-sgct-photomaillage/ODACIT/EMS_PM2022/tileset.json , and it works properly (loading lots of tile), so it is something that has to do with the "Cesium OSM buildings" Dataset ... maybe their tileset.json is from another version of 3D tiles ??