Display a web scene

Learn how to create and display a scene from a web scene stored in ArcGIS.

This tutorial shows you how to create and display a scene from a web scene. All web scenes are stored in ArcGIS with a unique item ID. You will access an existing web scene by item ID and display its layers. The web scene contains feature layers for the Santa Monica Mountains in California.

Prerequisites

Choose your API

You can do this tutorial in C++ or QML. Make your selection:

• Steps for C++
• Steps for QML

Steps for C++

Open the project in Qt Creator

1. To start this tutorial, complete the Display a scene tutorial or download and unzip the solution.

2. Open the display_a_scene project in Qt Creator.

3. If you downloaded the solution, get an access token and set the API key.

   More info

   An API Key gives your app access to secure resources used in this tutorial.

   1. Go to the Create an API key tutorial to obtain a new API key access token. Ensure that the following privilege is enabled: Location services > Basemaps > Basemap styles service. Copy the access token as it will be used in the next step.

   2. In the Projects window, in the Sources folder, open the main.cpp file.

   3. Modify the code to set the API key to the access token.

      main.cpp

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          // 2. API key authentication: Get a long-lived access token that gives your application access to
          // ArcGIS location services. Go to the tutorial at https://links.esri.com/create-an-api-key.
          // Copy the API Key access token.
      
        const QString accessToken = QStringLiteral("");
      

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Get the web scene item ID

You can use ArcGIS tools to create and view web scenes. Use the Scene Viewer to identify the web scene item ID. This item ID will be used later in the tutorial.

1. Go to the LA Trails and Parks web scene in the Scene Viewer in ArcGIS Online. This web scene displays trails, trailheads and parks in the Santa Monica Mountains.
2. Make a note of the item ID at the end of the browser's URL. The item ID should be 579f97b2f3b94d4a8e48a5f140a6639b.

Remove unneeded code

A web scene can define all of the content created in this code, such as the basemap, elevation layer, and initial viewpoint. Accordingly, the following code needs to be removed or changed.

1. In Projects, double-click Sources > Display_a_scene.cpp to open the file.

2. Delete the following lines to remove the Camera object and all of its arguments.

   Display_a_scene.cpp

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   // Set the view (created in QML)
   void Display_a_scene::setSceneView(SceneQuickView* sceneView)
   {
     if (!sceneView || sceneView == m_sceneView)
     {
       return;
     }
     m_sceneView = sceneView;
     m_sceneView->setArcGISScene(m_scene);
   
     constexpr double latitude = 33.909;
     constexpr double longitude = -118.805;
     constexpr double altitude = 5330.0;
     constexpr double heading = 355.0;
     constexpr double pitch = 72.0;
     constexpr double roll = 0.0;
     const Camera sceneCamera(latitude, longitude, altitude, heading, pitch, roll);
     m_sceneView->setViewpointCameraAndWait(sceneCamera);
   

3. Change the constructor to avoid initializing m_scene with the BasemapStyle enum. Make the constructor match the following code.

   Display_a_scene.cpp

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   using namespace Esri::ArcGISRuntime;
   Display_a_scene::Display_a_scene(QObject* parent /* = nullptr */):
   
       QObject(parent)
   

4. Remove all of the existing code from the setupScene method.

   Display_a_scene.cpp

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   void Display_a_scene::setupScene()
   {
   
     ArcGISTiledElevationSource* elevationSource = new ArcGISTiledElevationSource(QUrl("https://elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer"), this);
   
     Surface* elevationSurface = new Surface(this);
     elevationSurface->elevationSources()->append(elevationSource);
   
     elevationSurface->setElevationExaggeration(2.5);
     m_scene->setBaseSurface(elevationSurface);
   
   }
   More info

   Loading a scene from a web scene usually requires less code and makes it easier to update a scene used by several apps. Furthermore, web scenes can provide a more consistent experience for your user.

Display a web scene using its portal item URL

You can display a web scene using the web scene's item ID. Create a scene from the web scene portal item, and display it in your app.

1. Add code to the setupScene method to create the web scene portal URL. Concatenate the web scene's unique item ID and the URL for ArcGIS Online.

   Display_a_scene.cpp

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   void Display_a_scene::setupScene()
   {
   
       // Create an item_id to reference an item at a web server
       const QString item_id("579f97b2f3b94d4a8e48a5f140a6639b");
       // Create a QUrl from the web scene server URL and the item_id
       const QUrl portal_url(QString("https://arcgis.com/sharing/rest/content/items/" + item_id));
   
   

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2. Create the Scene using the web scene's URL.

   Display_a_scene.cpp

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   void Display_a_scene::setupScene()
   {
   
       // Create an item_id to reference an item at a web server
       const QString item_id("579f97b2f3b94d4a8e48a5f140a6639b");
       // Create a QUrl from the web scene server URL and the item_id
       const QUrl portal_url(QString("https://arcgis.com/sharing/rest/content/items/" + item_id));
   
       // Create the scene, referencing the QUrl
       m_scene = new Scene(portal_url, this);
   

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3. Press Ctrl + R to run the app.

Your app displays the scene that you viewed earlier in the Scene Viewer.

Steps for Qml

Open the project in Qt Creator

1. To start this tutorial, complete the Display a scene tutorial or download and unzip the solution.

2. Open the display_a_scene project in Qt Creator.

3. If you downloaded the solution, get an access token and set the API key.

   More info

   An API Key gives your app access to secure resources used in this tutorial.

   1. Go to the Create an API key tutorial to obtain a new API key access token. Ensure that the following privilege is enabled: Location services > Basemaps > Basemap styles service. Copy the access token as it will be used in the next step.

   2. In the Projects window, in the Sources folder, open the main.cpp file.

   3. Modify the code to set the API key to the access token.

      main.cpp

      Expand

      Use dark colors for code blocks

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          // 2. API key authentication: Get a long-lived access token that gives your application access to
          // ArcGIS location services. Go to the tutorial at https://links.esri.com/create-an-api-key.
          // Copy the API Key access token.
      
        const QString accessToken = QStringLiteral("");
      

      Expand

Get the web scene item ID

You can use ArcGIS tools to create and view web scenes. Use the Scene Viewer to identify the web scene item ID. This item ID will be used later in the tutorial.

1. Go to the LA Trails and Parks web scene in the Scene Viewer in ArcGIS Online. This web scene displays trails, trailheads and parks in the Santa Monica Mountains.
2. Make a note of the item ID at the end of the browser's URL. The item ID should be 579f97b2f3b94d4a8e48a5f140a6639b.

Remove unneeded code

A web scene can define all of the content created in this code, such as the basemap style, elevation layer, and initial viewpoint. Accordingly, the following code needs to be removed or changed.

1. If the main.qml file is not already open, in the Projects window, navigate to Resources > qml\qml.qrc > /qml and open main.qml.

2. Delete the code that sets the BasemapStyle enum for the Scene. At the same time, delete the Surface created using the ArcGIS image server.

   main.qml

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           // add a Scene to the SceneView
           Scene {
   
               // add the ArcGISImagery basemap to the scene
               initBasemapStyle: Enums.BasemapStyleArcGISImageryStandard
   
   
               // add a surface, surface is a default property of scene
               Surface {
                   // add an arcgis tiled elevation source...elevation source is a default property of surface
                   ArcGISTiledElevationSource {
                       url: "https://elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer"
                   }
               }
   

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3. Delete the code that sets the ViewPoint on Camera.

   main.qml

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           Component.onCompleted: {
               // set viewpoint to the specified camera
               setViewpointCameraAndWait(camera);
           }
   

4. Remove the Camera.

   main.qml

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       Camera {
           id: camera
           heading: 355.0
           pitch: 72.0
           roll: 0.0
   
           Point {
               x: -118.794
               y: 33.909
               z: 5330.0
               spatialReference: SpatialReference { wkid: 4326 }
           }
       }
   
   More info

   Loading a scene from a web scene usually requires less code and makes it easier to update a scene used by several apps. Furthermore, web scenes can provide a more consistent experience for your user.

Display a web scene using its portal item ID

You can display a web scene using the web scene's item ID. Create a scene from the web scene portal item, and display it in your app.

1. Create the Scene using a PortalItem and set the itemId to the ID for the LA Trails and Parks web scene. This code creates a Scene from the web scene configuration.

   main.qml

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           // add a Scene to the SceneView
           Scene {
   
               // Declare a PortalItem by setting Item ID. PortalItem is a default property of Scene.
               PortalItem {
                   itemId: "579f97b2f3b94d4a8e48a5f140a6639b"
               }
   

   Expand

2. Press Ctrl + R to run the app.

Your app displays the scene that you viewed earlier in the Scene Viewer.

What's Next?

Learn how to use additional API features, ArcGIS location services, and ArcGIS tools in these tutorials:

• Display a web map
• Display an offline map (on-demand)
• Display a map from a mobile map package