allow user to add layer from cesium ion asset

[kfarr]

As a user, I wish to be able to add 3d tiles hosted on cesium ion such as a 3d drone photogrammetry. The user would provide an asset ID and a cesiumIONToken and a new user layer would be created that renders this. I can then modify the position, orientation, scale of the asset to match my scene.

R&D to make this

---

Here's the result of a timebox'ed exercise to get cesium ion tiles working in 3DStreet.

I was able to barely get cesium 3d tiles to load using the existing loader-3dtiles component by adding cesiumIONToken and url values. here is the syntax as json inside of 3dstreet.json scene:

      {
        "components": {
          "loader-3dtiles": "url: https://assets.ion.cesium.com/2133402/tileset.json?v=3; cesiumIONToken: [redacted]; cameraEl: #camera;",
          "rotation": "-90 0 90"
        },
        "data-layer-name": "CESIUM ION TEST Layer • Treat Plaza",
        "element": "a-entity",
        "id": "testingtesting123"
      }

you can see it on this scene (to get this to work, you'll have to add a location to turn on google 3d tiles AND you have to enter viewer mode / return to editor)
https://3dstreet.app/#/scenes/e3e314ef-656e-4a9e-a15a-abc9fb84b9be.json

unfortunately I can't save the scene. There is an error RangeError: Maximum call stack size exceeded when I attempt to save.

• should this be a new component such as cesium ion asset? that may address the saving issue at least. the user can also just provide an asset id and we use a default cesium ion token if none is provided.
• in theory we should use an api all to find the tileset URL instead of using the inferred URL structure: https://cesium.com/learn/ion/rest-api/#operation/getAssetEndpoint
• when loading the tiles there is a console error Uncaught TypeError: Converting circular structure to JSON
• this requires manual placement and sizing of the tiles. as a user scanning a scene, the only way to guarantee scale and placement is to use a meterstick or other calibration marker in the scene itself.
• do users expect to use both cesium ion tiles and google 3d tiles at the same time? yes this can work, video recorded, see below
• what is the next step? wait until customer is ready to use and then productize?

video of switching between google 3d tiles and a custom drone scan that has higher fidelity for striping and street surfaces

google-3d-tiles-custom-scan.mov

[kfarr]

@rahulkgupta when you get a chance could use your review of the above and provide feedback on next steps

[rahulkgupta]

i am having a hard time finding the PR. could you link it here?

[kfarr]

@rahulkgupta there is not a PR. The above pasted json snippet can be injected in a scene's json description to load an arbitrary cesium ion asset ID. The problem is that there is no UI for a user to create this, and it does not save correctly it has to be manually inserted via firefoo or manual editing of JSON.

I made a commit on the 3dtiles loader repo just to update the demo with a cesium ion example if you want to see a declarative / a-frame version instead of json code:
3DStreet/aframe-loader-3dtiles-component@39e171f