Tutorial: Add an integrated mesh

Learn how to display an integrated mesh in a scene.

An integrated mesh is a type of I3S data that is used to model an entire area. Typically created through aerial imagery, an integrated mesh consists of a single continuous surface that contains everything within a certain extent. For example, an integrated mesh depicting a city will depict buildings as well as trees, bridges, cars on the road, and any other object within the extent. Integrated meshes are an OGC community standard.

This tutorial explains how to add an integrated mesh to your CesiumJS application using the I3SDataProvider class. The integrated mesh you will use is hosted in the Buildings Frankfurt 2021 scene layer.

Prerequisites

Steps

Create a new pen

1. To get started, either complete the Display a scene tutorial or use this pen.

Get an access token

You need an access token with the correct privileges to access the resources used in this tutorial.

1. Go to the Create an API key tutorial and create an API key with the following privilege(s):
   

   • Privileges
     • Location services > Basemaps
   • Item access
     • Note: If you are using your own custom data layer for this tutorial, you need to grant the API key credentials access to the layer item. Learn more in Item access privileges.

2. Copy the API key access token to your clipboard when prompted.

3. In CodePen, update the accessToken variable to use your access token.

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         const accessToken = "YOUR_ACCESS_TOKEN";
   
         Cesium.ArcGisMapService.defaultAccessToken = accessToken;
   
         const cesiumAccessToken = "YOUR_CESIUM_ACCESS_TOKEN";
   
         Cesium.Ion.defaultAccessToken = cesiumAccessToken;
   
         const arcGisImagery = Cesium.ArcGisMapServerImageryProvider.fromBasemapType(Cesium.ArcGisBaseMapType.SATELLITE);
   
         const viewer = new Cesium.Viewer("cesiumContainer", {
   
           baseLayer: Cesium.ImageryLayer.fromProviderAsync(arcGisImagery),
   
         });
   

To learn about the other types of authentication available, go to Types of authentication.

Update the camera position

1. This tutorial uses an integrated mesh centered on the city of Frankfurt. Update the camera to focus on the coordinates [8.691, 50.104] with a height of 300. Change the orientation heading to Cesium.Math.toRadians(-55) and orientation pitch to Cesium.Math.toRadians(-10.0).

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         const viewer = new Cesium.Viewer("cesiumContainer", {
   
             baseLayer: Cesium.ImageryLayer.fromProviderAsync(arcGisImagery),
   
             terrain: Cesium.Terrain.fromWorldTerrain(),
             timeline: false,
             animation: false,
             geocoder:false
   
         });
   
         viewer.camera.setView({
             destination: Cesium.Cartesian3.fromDegrees(8.691,50.104,300),
             orientation: {
               heading: Cesium.Math.toRadians(-55),
               pitch: Cesium.Math.toRadians(-10.0)
             }
         });
   
   

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Add a terrain provider

To create accurate and realistic terrain in your CesiumJS scene, you need to use a geoid service. This service will allow the elevation of your integrated mesh to align with the elevation values of Cesium World Terrain.

1. Initialize a terrain provider called geoidService that references the Earth Gravitational Model EGM2008. This provider will allow for geoid conversion between the gravity-based integrated mesh and the ellipsoidal-based Cesium World Terrain.

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         viewer.camera.setView({
             destination: Cesium.Cartesian3.fromDegrees(8.691,50.104,300),
             orientation: {
               heading: Cesium.Math.toRadians(-55),
               pitch: Cesium.Math.toRadians(-10.0)
             }
         });
   
         const geoidService = await Cesium.ArcGISTiledElevationTerrainProvider.fromUrl("https://tiles.arcgis.com/tiles/GVgbJbqm8hXASVYi/arcgis/rest/services/EGM2008/ImageServer");
   
         const i3sLayer = "https://tiles.arcgis.com/tiles/cFEFS0EWrhfDeVw9/arcgis/rest/services/Buildings_Frankfurt_2021/SceneServer";
   
   

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Add an integrated mesh

1. Reference the service URL of the Buildings Frankfurt 2021 scene layer.

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         const geoidService = await Cesium.ArcGISTiledElevationTerrainProvider.fromUrl("https://tiles.arcgis.com/tiles/GVgbJbqm8hXASVYi/arcgis/rest/services/EGM2008/ImageServer");
   
         const i3sLayer = "https://tiles.arcgis.com/tiles/cFEFS0EWrhfDeVw9/arcgis/rest/services/Buildings_Frankfurt_2021/SceneServer";
   
   

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2. Create an I3SDataProvider by calling the fromUrl method. Pass the geoidService you created as well as your access token to provide authentication.

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         const geoidService = await Cesium.ArcGISTiledElevationTerrainProvider.fromUrl("https://tiles.arcgis.com/tiles/GVgbJbqm8hXASVYi/arcgis/rest/services/EGM2008/ImageServer");
   
         const i3sLayer = "https://tiles.arcgis.com/tiles/cFEFS0EWrhfDeVw9/arcgis/rest/services/Buildings_Frankfurt_2021/SceneServer";
   
         const i3sProvider = await Cesium.I3SDataProvider.fromUrl(i3sLayer, {
             geoidTiledTerrainProvider: geoidService,
             token: accessToken
         })
   
   

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3. Add the I3S provider to your viewer as a Primitive.

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         const geoidService = await Cesium.ArcGISTiledElevationTerrainProvider.fromUrl("https://tiles.arcgis.com/tiles/GVgbJbqm8hXASVYi/arcgis/rest/services/EGM2008/ImageServer");
   
         const i3sLayer = "https://tiles.arcgis.com/tiles/cFEFS0EWrhfDeVw9/arcgis/rest/services/Buildings_Frankfurt_2021/SceneServer";
   
         const i3sProvider = await Cesium.I3SDataProvider.fromUrl(i3sLayer, {
             geoidTiledTerrainProvider: geoidService,
             token: accessToken
         })
   
         viewer.scene.primitives.add(i3sProvider);
   

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Run the app

In CodePen, run your code to display the map. The map should display the city of Frankfurt with an integrated mesh.

What's next?

Learn how to use additional ArcGIS location services in these tutorials: