View content beneath the terrain surface

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Sample viewer app

See through terrain in a scene and move the camera underground.

View content beneath the terrain surface sample

Use case

By default, a scene's terrain is fully opaque and the camera cannot go underground. To see underground features such as pipes in a utility network, you can lower the opacity of the terrain surface and set the navigation constraint on the surface to allow underground navigation.

How to use the sample

The sample loads a scene with underground features. Pan and zoom to explore the scene. Observe how the opacity of the base surface is reduced and the navigation constraint is removed, allowing you to pan and zoom through the base surface.

How it works

Display an AGSScene in an AGSSceneView which contains layers with underground features.
To see underground, get the scene's base surface and set its opacity to a value between 0 and 1.
To allow the camera to go underground, set the surface's navigation constraint to none.

Relevant API

AGSSurface

About the data

This data is a point scene layer showing underground wellbore paths (green polylines) and seismic events (orange points).

Sample Code

ViewContentBeneathTerrainSurfaceViewController.swift
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// Copyright 2019 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
//
//   http://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 UIKit
import ArcGIS

class ViewContentBeneathTerrainSurfaceViewController: UIViewController {
    @IBOutlet var sceneView: AGSSceneView! {
        didSet {
            sceneView.scene = makeScene()
        }
    }

    /// Creates a scene with a portal item.
    ///
    /// - Returns: A new `AGSScene` object.
    func makeScene() -> AGSScene {
        // initialize portal with AGOL
        let portal = AGSPortal.arcGISOnline(withLoginRequired: false)

        // get the portal item
        let portalItem = AGSPortalItem(portal: portal, itemID: "91a4fafd747a47c7bab7797066cb9272")

        let scene = AGSScene(item: portalItem)

        // changing the navigation constraint manually
        scene.baseSurface?.navigationConstraint = .none
        scene.baseSurface?.opacity = 0.6

        return scene
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        // add the source code button item to the right of navigation bar
        (self.navigationItem.rightBarButtonItem as! SourceCodeBarButtonItem).filenames = ["ViewContentBeneathTerrainSurfaceViewController"]
    }
}