Display a scene

Learn how to create and display a scene with a basemap layer and an elevation layer. Set properties of the scene's camera to control the 3D perspective.

display a scene

Like a map, a scene contains layers of geographic data. It contains a basemap layer and, optionally, one or more data layers. To provide a realistic view of the terrain, you can also add elevation layers to define the height of the surface across the scene. The 3D perspective of the scene is controlled by the scene's camera, which defines the position of the scene observer in 3D space.

In this tutorial, you create and display a scene using the imagery basemap layer. The surface of the scene is defined with an elevation layer and the camera is positioned to display an area of the Santa Monica Mountains in the scene view.

The scene and code will be used as the starting point for other 3D tutorials.

Prerequisites

The following are required for this tutorial:

  1. An ArcGIS account to access API keys. If you don't have an account, sign up for free.
  2. Your system meets the system requirements.
  3. The ArcGIS Runtime API for Qt is installed.

Choose your API

You can do this tutorial in C++ or QML:

Steps for C++

Create a new ArcGIS Runtime Qt Creator Project

Use Qt Creator to create an app that displays a Scene centered on the Santa Monica Mountains in Southern California.

  1. Start Qt Creator.

  2. Click File > New File or Project. In the left frame, under Projects, select ArcGIS.

  3. Select the ArcGIS Runtime 100.14 Qt Quick C++ app project template, or a later version, and click Choose.

    You may see several selections for the ArcGIS project type. Be sure to select ArcGIS Runtime 100.14 Qt Quick C++ app (or a later version).

  4. At the Project Location dialog, name your project Display_a_scene. Click Next.

  5. At the Define Build System dialog, select qmake for your build system. Click Next.

  6. At the Define Project Details dialog, enter a description for this app (or leave it as is). Click 3D project. At the ArcGIS Online Basemap dropdown menu, select Imagery. Leave the rest of this dialog unchanged and click Next.

  7. At the Kit Selection dialog, check the kit(s) you previously set up when you installed Qt. You should select a Desktop kit to perform all steps in this tutorial. Click Next.

    The Add as a subproject to root project option is only available if you have already created a root project. Ignore this option for this tutorial.

  8. Verify your selections and click Finish.

Get an API key

An API key is required to enable access to services, web maps, and web scenes hosted in ArcGIS Online.

If you haven't already, go to your developer dashboard to get your API key. For these tutorials, use your default API key. It is scoped to include all of the services demonstrated in the tutorials.

Display a scene

  1. In the Projects window, open the Headers folder. Double-click the file Display_a_scene.h to open it.

  2. Add the declaration void setupScene(); under private:. Then save and close the file.

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    private:
        Esri::ArcGISRuntime::SceneQuickView* sceneView() const;
        void setSceneView(Esri::ArcGISRuntime::SceneQuickView* sceneView);
    
        Esri::ArcGISRuntime::Scene* m_scene = nullptr;
        Esri::ArcGISRuntime::SceneQuickView* m_sceneView = nullptr;
    
        void setupScene();
    
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  3. In the Projects window, open the Sources folder. Open the main.cpp file. Paste the API key (that you retrieved from your dashboard) between the quotes on the line indicated. Save and close the file.

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      // 2. API key: A permanent key that gives your application access to Esri
      // location services. Create a new API key or access existing API keys from
      // your ArcGIS for Developers dashboard (https://links.esri.com/arcgis-api-keys).
    
      const QString apiKey = QStringLiteral("");
    
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  4. In the Projects window, open the Sources folder. Open the Display_a_scene.cpp file and, if present, remove the following code. Basemap is not used.

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    #include "Display_a_scene.h"
    
    #include "ArcGISTiledElevationSource.h"
    
    #include "Basemap.h"
    
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  5. Delete the code from the body of the constructor.

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    Display_a_scene::Display_a_scene(QObject* parent /* = nullptr */):
        QObject(parent),
        m_scene(new Scene(BasemapStyle::ArcGISImageryStandard, this))
    {
    
        // create a new elevation source from Terrain3D rest service
        ArcGISTiledElevationSource* elevationSource = new ArcGISTiledElevationSource(
                    QUrl("https://elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer"), this);
        // add the elevation source to the scene to display elevation
        m_scene->baseSurface()->elevationSources()->append(elevationSource);
    
    }
    
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  6. Add this line to call to the new method, setupScene, that you will create.

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    Display_a_scene::Display_a_scene(QObject* parent /* = nullptr */):
      QObject(parent),
      m_scene(new Scene(BasemapStyle::ArcGISImageryStandard, this))
    {
    
      setupScene();
    
    }
    
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  7. Create the new method named setupScene at the end of this file, after the closing brace of setSceneView().

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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);
    
      emit sceneViewChanged();
    }
    
    void Display_a_scene::setupScene()
    {
    
    }
    
  8. Create an ElevationSource instance to define the base surface for the scene.

    An elevation source can define a surface with 3D terrain in a scene. Without an elevation source, the default globe surface is used to display the scene.

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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);
    
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  9. Create a Surface instance and append the elevationSource to it.

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      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);
    
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  10. Set the ElevationExaggeration value (to improve elevation visibility), and then set the elevationSurface for m_scene.

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      Surface* elevationSurface = new Surface(this);
      elevationSurface->elevationSources()->append(elevationSource);
    
      elevationSurface->setElevationExaggeration(2.5);
      m_scene->setBaseSurface(elevationSurface);
    
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  11. Inside of the setSceneView() method, create a Camera with the given parameters.

    The position from which you view the scene from is defined by a Camera. The following properties of the camera are used to define an observation point in the scene:

    • latitude: The measurement of distance north or south of the Equator
    • longitude: The measurement east or west of the prime meridian
    • altitude: The distance above sea level
    • heading: Azimuth of the camera's direction
    • pitch: Up and down angle
    • roll: Side-to-side angle
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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);
    
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  12. Press <Ctrl+R> to run the app.

You should see a scene with the topographic basemap layer centered on the Santa Monica Mountains in California. Double-click, drag, and scroll the mouse wheel over the scene view to explore the scene.

Steps for QML

Create a new ArcGIS Runtime Qt Creator Project

Use Qt Creator to create an app that displays a Scene centered on the Santa Monica Mountains.

  1. Start Qt Creator.

  2. Click File > New File or Project. In the left frame, under Projects, select ArcGIS.

  3. Select the ArcGIS Runtime 100.14 Qt Quick QML app project template, or a later version, and click Choose.

    You may have several selections for the ArcGIS project type. Be sure to select ArcGIS Runtime 100.14 Qt Quick QML app (or a later version).

  4. On the Project Location dialog, name your project Display_a_scene. Click Next.

  5. On the Define Build System dialog, select qmake for your build system. Click Next.

  6. On the Define Project Details dialog, give this app a description or leave it as is. Click 3D project. At the ArcGIS Online Basemap dropdown menu, select Imagery. For your application, this selection will create a Surface using an ArcGISTiledElevationSource from an ArcGIS image server. Leave the rest of this dialog unchanged and click Next.

  7. On the Kit Selection dialog, check the kit(s) you previously set up when you installed Qt. You should select a Desktop kit to run this tutorial. Click Next.

    The Add as a subproject to root project option is only available if you have already created a root project. Ignore this option for this tutorial.

  8. Verify your selections and click Finish.

Get an API key

An API key is required to enable access to services, web maps, and web scenes hosted in ArcGIS Online.

If you haven't already, go to your developer dashboard to get your API key. For these tutorials, use your default API key. It is scoped to include all of the services demonstrated in the tutorials.

Use an image server and camera to display a scene

  1. Within the SceneView, add code to set a 3D Viewpoint on a Camera, which you will add in the next step.

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                // 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"
                    }
                }
    
            }
    
            Component.onCompleted: {
                // set viewpoint to the specified camera
                setViewpointCameraAndWait(camera);
            }
    
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  2. Add the following code to create a Camera. Provide a Point for the camera location and provide camera properties.

    The position you view the scene from is defined by a Camera. The following properties of the camera are used to define an observation point in the scene:

    • 3D location: Longitude (x), latitude (y), and altitude (z)
    • heading: Azimuth of the camera's direction
    • pitch: Up and down angle
    • roll: Side-to-side angle
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            Component.onCompleted: {
                // set viewpoint to the specified camera
                setViewpointCameraAndWait(camera);
            }
    
        }
    
        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 }
            }
        }
    
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  3. In the Projects window, open the Sources folder and open the main.cpp file.

  4. Paste the API key (you retrieved from your dashboard) between the quotes on the line indicated. Save and close the file.

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            // 2. API key: A permanent key that gives your application access to Esri
            // location services. Create a new API key or access existing API keys from
            // your ArcGIS for Developers dashboard (https://links.esri.com/arcgis-api-keys).
    
            const QString apiKey = QString("");
    
    Expand
  5. Press <Ctrl+R> to run the app.

You will see a scene with the topographic basemap layer centered on the Santa Monica Mountains in California. Double-click, drag, and scroll the mouse wheel over the scene view to explore the scene.

What's next?

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

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