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.

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

Steps

Create a new Xcode project

Use Xcode to create a single view iOS app and configure it to reference the API.

1. Open Xcode. In the menu bar, click File > New > Project > iOS > Single View App > Next.

   • In the Choose options window, set the following properties:
     • Product Name: <your app name>
     • Language: Swift
     • User interface: Storyboard
     • Organization Identifier: <your organization>
   • Uncheck all other options.
   • Click Next > Create.

2. Add a reference to the API by following the instructions in Get the API - Configure a project.

Add a scene view to the UI

A scene view is a UI component that displays a scene. It also handles user interactions with the scene, including navigating with touch gestures. Use Xcode and the storyboard editor to add a scene view to the UI and connect it to the view controller source code. Set the scene view size to fill the entire device display.

1. In the Project Navigator, click ViewController.swift.

2. In the editor, add an import statement to reference the API and add an @IBOutlet named sceneView and of type AGSSceneView. This will provide a reference to the scene view that you will create in the storyboard.

   ViewController.swift

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   import UIKit
   
   import ArcGIS
   
   class ViewController: UIViewController {
   
       @IBOutlet var sceneView: AGSSceneView!
   
       override func viewDidLoad() {
           super.viewDidLoad()
   
       }
   
   }
   
   More info

   AGSSceneView is a subclass of UIView.

3. In the Project Navigator, click Main.storyboard to open the storyboard editor.

4. In the menu, click View > Show Library to display the object library.

5. In the object library browser:

   • Type uiview or scroll down to find View.
   • Drag and drop a new view on to the storyboard's main view.

6. At the bottom right of the storyboard editor, click Add New Constraints. In the panel:

   • Type 0 for the top, right, bottom, and left constraints.
   • Click Add 4 Constraints.

   The new view expands to fill the display.

7. In the menu, click View > Inspectors > Show Identity Inspector. In the Inspectors panel, set Custom Class > Class to AGSSceneView.

   This sets the type of the new view to AGSSceneView.

8. In the storyboard editor, right-click on the yellow View Controller icon to display the Connections panel. Drag the sceneView outlet connector to the new AGSSceneView view on the storyboard.

   This connects the AGSSceneView in the storyboard to the sceneView outlet created earlier in the ViewController class.

Add a scene

Use the scene view to display a scene centered on the Santa Monica Mountains in California. The scene will contain an imagery basemap layer.

1. In Xcode, in the Project Navigator, click ViewController.swift.

2. In the editor, define a private method named setupScene(). In setupScene() create an AGSScene.

   ViewController.swift

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   class ViewController: UIViewController {
   
       @IBOutlet var sceneView: AGSSceneView!
   
       private func setupScene() {
   
           let scene = AGSScene(basemapStyle: .arcGISImageryStandard)
   
       }
   
       override func viewDidLoad() {
           super.viewDidLoad()
   
       }
   
   }
   

3. Create a new AGSSurface and add a new AGSArcGISTiledElevationSource to it to define the base surface for the scene. Set the newly created surface as the base surface of the scene.

   More info

   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.

   ViewController.swift

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       private func setupScene() {
   
           let scene = AGSScene(basemapStyle: .arcGISImageryStandard)
   
           let elevationSurface: AGSSurface = {
               let elevationServiceURL = URL(string: "https://elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer")!
               let elevationSource = AGSArcGISTiledElevationSource(url: elevationServiceURL)
               let surface = AGSSurface()
               surface.elevationSources.append(elevationSource)
               surface.elevationExaggeration = 2.5
               return surface
           }()
   
           scene.baseSurface = elevationSurface
   
       }
   

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4. Set the initial viewpoint of the sceneView using an AGSPoint and an AGSCamera.

   More info

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

   • 3D location: Latitude, longitude, and altitude
   • Heading: Azimuth of the camera's direction
   • Pitch: Up and down angle
   • Roll: Side-to-side angle
   ViewController.swift

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           scene.baseSurface = elevationSurface
   
           let initialViewpoint = AGSViewpoint(
               center: AGSPoint(x: -118.805, y: 34.027, spatialReference: .wgs84()),
               scale: 10000,
               camera: AGSCamera(
                   location: AGSPoint(x: -118.804, y: 33.909, z: 5330.0, spatialReference: .wgs84()),
                   heading: 355.0,
                   pitch: 72.0,
                   roll: 0.0
               )
           )
   
           scene.initialViewpoint = initialViewpoint
   

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5. Set the scene property of the sceneView outlet to the new AGSScene.

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           scene.initialViewpoint = initialViewpoint
   
           sceneView.scene = scene
   
       }
   

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6. In the ViewController's viewDidLoad method, call setupScene() once the view has loaded.

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       override func viewDidLoad() {
           super.viewDidLoad()
   
           setupScene()
   
       }
   

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Set your 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.

1. In the Project Navigator, click AppDelegate.swift.

2. In the editor, add an import statement to reference the API and in the AppDelegate's application(_:didFinishLaunchingWithOptions:) method, set the apiKey property on the AGSArcGISRuntimeEnvironment with your API Key.

   AppDelegate.swift

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   import UIKit
   
   import ArcGIS
   
   
   @main
   class AppDelegate: UIResponder, UIApplicationDelegate {
   
       func application(_ application: UIApplication,
                        didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
           // Note: it is not best practice to store API keys in source code.
           // The API key is referenced here for the convenience of this tutorial.
   
           AGSArcGISRuntimeEnvironment.apiKey = "YOUR_API_KEY"
   
           return true
       }
   
       // MARK: UISceneSession Lifecycle
   
       func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
           // Called when a new scene session is being created.
           // Use this method to select a configuration to create the new scene with.
           return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
       }
   }
   

3. Press <Command+R> to run the app.

   More info

   If you are using the Xcode simulator your system must meet these minimum requirements: macOS Big Sur 11.3, Xcode 13, iOS 13. If you are using a physical device, then refer to the system requirements.

You should see a scene with the imagery basemap layer centered on the Santa Monica Mountains in California. Drag, pinch, and rotate on 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:

• Display a web scene
• Display a web map
• Add a feature layer