Tutorial: Display a 3D object pop-up

Learn how to display attributes of 3D objects in a pop-upA pop-up is a visual element used to display data for features or graphics in a map.Learn more when clicked.

A pop-upA pop-up is a visual element used to display data for features or graphics in a map.Learn more, also known as a "popup", is a visual element that displays information about an object when it is clicked. You typically style and configure a pop-up using HTML and CSS for each layerA layer is a reference to a collection of geographic data that is used to access and display data. The data for layers are typically provided by the basemap layer service and data services.Learn more in a map. Pop-ups can display attribute values, calculated values, or rich content such as images, charts, or videos.

In this tutorial, you customize the interactive pop-up created by CesiumJS for the San Francisco Buildings 3D object layer. When a building is clicked, a pop-up is displayed containing the name of the building and its object ID.

Prerequisites

Steps

Get the starter app

Select a type of authentication and follow the steps to create a new app.

Set up authentication

Set developer credentials

Get a Cesium ion access token

All Cesium applications must use an access token provided through Cesium ion. This token allows you to access assets such as Cesium World Terrain in your application.

1. Go to your Cesium ion dashboard to generate an access token. Copy the key to your clipboard.

2. Create a cesiumAccessToken variable and replace YOUR_CESIUM_ACCESS_TOKEN with the access token you copied from the Cesium ion dashboard.

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       <script>
   
       /* Use for API key authentication */
       const accessToken = "YOUR_ACCESS_TOKEN";
   
       // or
   
       /* Use for user authentication */
       // const session = await arcgisRest.ArcGISIdentityManager.beginOAuth2({
       //   clientId: "YOUR_CLIENT_ID", // Your client ID from OAuth credentials
       //   redirectUri: "YOUR_REDIRECT_URI", // The redirect URL registered in your OAuth credentials
       //   portal: "YOUR_PORTAL_URL" // Your portal URL
       // })
   
       // const accessToken = session.token;
   
       Cesium.ArcGisMapService.defaultAccessToken = accessToken;
   
       const cesiumAccessToken = "YOUR_CESIUM_ACCESS_TOKEN";
   
       </script>
   

3. Configure Cesium.Ion.defaultAccessToken with the Cesium access token to validate the application.

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       <script>
   
       /* Use for API key authentication */
       const accessToken = "YOUR_ACCESS_TOKEN";
   
       // or
   
       /* Use for user authentication */
       // const session = await arcgisRest.ArcGISIdentityManager.beginOAuth2({
       //   clientId: "YOUR_CLIENT_ID", // Your client ID from OAuth credentials
       //   redirectUri: "YOUR_REDIRECT_URI", // The redirect URL registered in your OAuth credentials
       //   portal: "YOUR_PORTAL_URL" // Your portal URL
       // })
   
       // const accessToken = session.token;
   
       Cesium.ArcGisMapService.defaultAccessToken = accessToken;
   
       const cesiumAccessToken = "YOUR_CESIUM_ACCESS_TOKEN";
   
       Cesium.Ion.defaultAccessToken = cesiumAccessToken;
   
       </script>
   

Update the camera position

1. Update the camera position to -122.43305, 37.77655, 500 to focus on San Francisco, California.

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       viewer.camera.setView({
         destination: Cesium.Cartesian3.fromDegrees(-122.43305, 37.77655, 500),
         orientation: {
           heading: Cesium.Math.toRadians(60),
           pitch: Cesium.Math.toRadians(-15.0)
         }
       });
   

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Add a terrain provider

To ensure that your 3D objects sit properly on top of the terrain, you need to use a geoidA geoid is a hypothetical surface representing the form the earth's oceans would take if there were no land and the water could freely respond to the earth's gravitational and centrifugal forces.Learn more service. This service will allow the elevation of the 3D objects 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 3D object layer and the ellipsoidal-based Cesium World Terrain.

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       const geoidService = await Cesium.ArcGISTiledElevationTerrainProvider.fromUrl("https://tiles.arcgis.com/tiles/GVgbJbqm8hXASVYi/arcgis/rest/services/EGM2008/ImageServer");
   
       viewer.creditDisplay.addStaticCredit(new Cesium.Credit("National Geospatial-Intelligence Agency (NGA)", false));
   

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2. Add the data attributionData attribution is the requirement to display the names of data source providers in all applications when accessing ArcGIS content, layers, or services.Learn more for the elevation layer source.

   • Go to the EGM2008 itemAn item, also known as a content item, is a resource stored in a portal such as a web map, hosted layer, style, script tool, file, or notebook.Learn more.
   • Scroll down to the Acknowledgments section and copy its value.
   • Paste the copied value to the credit property.
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         const geoidService = await Cesium.ArcGISTiledElevationTerrainProvider.fromUrl("https://tiles.arcgis.com/tiles/GVgbJbqm8hXASVYi/arcgis/rest/services/EGM2008/ImageServer");
     
         viewer.creditDisplay.addStaticCredit(new Cesium.Credit("National Geospatial-Intelligence Agency (NGA)", false));
     

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Add 3D objects

1. Reference the service URL of the San Francisco 3D Objects scene layerA scene layer is a data layer is used to access and display 3D data from a scene service.Learn more.

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       const i3sLayer = "https://tiles.arcgis.com/tiles/z2tnIkrLQ2BRzr6P/arcgis/rest/services/SanFrancisco_Bldgs/SceneServer";
   
   

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2. Create an I3SDataProvider by calling the fromUrl method. Pass the geoidService you created and add it to the viewer.

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       const i3sLayer = "https://tiles.arcgis.com/tiles/z2tnIkrLQ2BRzr6P/arcgis/rest/services/SanFrancisco_Bldgs/SceneServer";
   
       const i3sProvider = await Cesium.I3SDataProvider.fromUrl(i3sLayer, {
         geoidTiledTerrainProvider: geoidService,
         token: accessToken
       });
   
       viewer.scene.primitives.add(i3sProvider);
   
   

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3. Add the data attributionData attribution is the requirement to display the names of data source providers in all applications when accessing ArcGIS content, layers, or services.Learn more for the scene layer source.

   • Go to the San Francisco 3D Objects itemAn item, also known as a content item, is a resource stored in a portal such as a web map, hosted layer, style, script tool, file, or notebook.Learn more.
   • Scroll down to the Acknowledgments section and copy its value.
   • Paste the copied value to the credit property.
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         const i3sLayer = "https://tiles.arcgis.com/tiles/z2tnIkrLQ2BRzr6P/arcgis/rest/services/SanFrancisco_Bldgs/SceneServer";
     
         const i3sProvider = await Cesium.I3SDataProvider.fromUrl(i3sLayer, {
           geoidTiledTerrainProvider: geoidService,
           token: accessToken
         });
     
         viewer.scene.primitives.add(i3sProvider);
     
         // Attribution text retrieved from https://www.arcgis.com/home/item.html?id=d3344ba99c3f4efaa909ccfbcc052ed5
         viewer.creditDisplay.addStaticCredit(new Cesium.Credit("Precision Light Works (PLW)", false));
     

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Get feature attributes

1. Create a click handler to detect user clicks on the viewer. Get the clicked feature using viewer.scene.pick(), and get the position of the click using viewer.scene.pickPosition().

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       // An entity object which will hold info about the currently selected feature for infobox display
       const selectedEntity = new Cesium.Entity();
       // Show metadata in the InfoBox.
       viewer.screenSpaceEventHandler.setInputAction(function onLeftClick(movement) {
         // Pick a new feature
         const pickedFeature = viewer.scene.pick(movement.position);
         if (!Cesium.defined(pickedFeature)) {
           return;
         }
         const pickedPosition = viewer.scene.pickPosition(movement.position);
   
       },
       Cesium.ScreenSpaceEventType.LEFT_CLICK);
   

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2. Create a helper function isNameProperty that checks if a property is a name field. You will use this helper function when displaying information of a clicked feature in a popup.

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       function isNameProperty(propertyName) {
         const name = propertyName.toLowerCase();
         if (
           name.localeCompare("name") === 0 ||
           name.localeCompare("objname") === 0
         ) {
           return true;
         }
         return false;
       }
   

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3. Inside the click handler, use I3SNode.loadFields() to load the properties of the closest I3S node. Get the exact geometry that was clicked using I3SGeometry.getClosestPointIndexOnTriangle.

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       // An entity object which will hold info about the currently selected feature for infobox display
       const selectedEntity = new Cesium.Entity();
       // Show metadata in the InfoBox.
       viewer.screenSpaceEventHandler.setInputAction(function onLeftClick(movement) {
         // Pick a new feature
         const pickedFeature = viewer.scene.pick(movement.position);
         if (!Cesium.defined(pickedFeature)) {
           return;
         }
         const pickedPosition = viewer.scene.pickPosition(movement.position);
   
         if (
           Cesium.defined(pickedFeature.content) &&
           Cesium.defined(pickedFeature.content.tile.i3sNode)
         ) {
           const i3sNode = pickedFeature.content.tile.i3sNode;
   
           i3sNode.loadFields().then(function () {
             const geometry = i3sNode.geometryData[0];
             if (pickedPosition) {
               const location = geometry.getClosestPointIndexOnTriangle(
                 pickedPosition.x,
                 pickedPosition.y,
                 pickedPosition.z
               );
               let description = "No attributes";
               let name;
   
               if (!Cesium.defined(name)) {
                 name = "unknown";
               }
               selectedEntity.name = name;
               selectedEntity.description = description;
               viewer.selectedEntity = selectedEntity;
             }
           });
         }
   
       },
       Cesium.ScreenSpaceEventType.LEFT_CLICK);
   

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4. Access the properties of the clicked geometry. Display them in an InfoBox.

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         if (
           Cesium.defined(pickedFeature.content) &&
           Cesium.defined(pickedFeature.content.tile.i3sNode)
         ) {
           const i3sNode = pickedFeature.content.tile.i3sNode;
   
           i3sNode.loadFields().then(function () {
             const geometry = i3sNode.geometryData[0];
             if (pickedPosition) {
               const location = geometry.getClosestPointIndexOnTriangle(
                 pickedPosition.x,
                 pickedPosition.y,
                 pickedPosition.z
               );
               let description = "No attributes";
               let name;
   
               if (location.index !== -1 && geometry.customAttributes.featureIndex) {
                 const featureIndex =
                   geometry.customAttributes.featureIndex[location.index];
                 if (Object.keys(i3sNode.fields).length > 0) {
                   description =
                     "<table class=\"cesium-infoBox-defaultTable\"><tbody>";
                   for (const fieldName in i3sNode.fields) {
                     if (Object.hasOwn(i3sNode.fields, fieldName)) {
                       const field = i3sNode.fields[fieldName];
                       description += `<tr><th>${field.name}</th><td>`;
                       description += `${field.values[featureIndex]}</td></tr>`;
                       console.log(
                         `${field.name}: ${field.values[featureIndex]}`
                       );
                       if (
                         !Cesium.defined(name) &&
                         isNameProperty(field.name)
                       ) {
                         name = field.values[featureIndex];
                       }
                     }
                   }
                   description += "</tbody></table>";
                 }
               }
   
               if (!Cesium.defined(name)) {
                 name = "unknown";
               }
               selectedEntity.name = name;
               selectedEntity.description = description;
               viewer.selectedEntity = selectedEntity;
             }
           });
         }
   

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Run the app

Run the app.

When you click on a feature, a popup should appear displaying the attribute information of the selected feature.

What's next?

Learn how to use additional location services in these tutorials: