Add scene layer from service

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// Copyright 2022 Esri
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//   https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import SwiftUI
import ArcGIS

struct AddSceneLayerFromServiceView: View {
    /// The scene for this sample.
    @StateObject private var scene: ArcGIS.Scene = {
        // Creates a scene and sets an initial viewpoint.
        let scene = Scene(basemapStyle: .arcGISTopographic)
        let point = Point(x: -4.4978, y: 48.3828, z: 62.0133, spatialReference: .wgs84)
        let camera = Camera(locationPoint: point, heading: 41.65, pitch: 71.2, roll: 0)
        scene.initialViewpoint = Viewpoint(targetExtent: point, camera: camera)

        // Creates a surface and adds an elevation source.
        let surface = Surface()
        surface.addElevationSource(ArcGISTiledElevationSource(url: .worldElevationService))

        // Sets the surface to the scene's base surface.
        scene.baseSurface = surface

        // Adds a scene layer from a URL to the scene's operational layers.
        scene.addOperationalLayer(ArcGISSceneLayer(url: .brestBuildingService))
        return scene
    }()

    var body: some View {
        SceneView(scene: scene)
    }
}

private extension URL {
    /// The URL of a Brest, France buildings scene service.
    static var brestBuildingService: URL {
        URL(string: "https://tiles.arcgis.com/tiles/P3ePLMYs2RVChkJx/arcgis/rest/services/Buildings_Brest/SceneServer/layers/0")!
    }

    /// The URL of the Terrain 3D ArcGIS REST Service.
    static var worldElevationService: URL {
        URL(string: "https://elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer")!
    }
}