Explore scenes in flyover AR

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Use augmented reality (AR) to quickly explore a scene more naturally than you could with a touch or mouse interface.

Scene shown in an app

Use case

You can use AR to drop into an area and visualize information, like a proposed development or a historical model of a city. You could use flyover AR to explore a city by walking through it virtually.

How to use the sample

When you open the sample, you'll be viewing the scene from above. You can walk around, using your device as a window into the scene. Try moving vertically to get closer to the ground. Touch gestures which

How it works

  1. Create the ARSceneView and add it to the view.
  2. Listen for ARKit tracking state updates using arView.ARSCNViewDelegate and provide guidance to the user as necessary.

    • To accomplish this, create a class that extends ARSCNViewDelegate and expose an event to receive updates.
  3. Create the scene, add content, then display it.
  4. When the content you want to view loads, get its center point and use that to create the origin camera for the AR view. Note that the altitude should be set so that all scene content is visible. For a city, a good value might be a bit higher than the tallest building. The sample uses 600 meters in the absence of tall buildings in the sample data.
  5. Set the translation factor so that you can move through the scene easily. With a translation factor of 800, you will move 800 feet in the scene for every foot you move the physical device.
  6. Set the space effect to Stars and atmosphere effect to Realistic to create an immersive experience.

Relevant API

  • ARSceneView

About the data

This sample uses a sample integrated mesh layer provided by Vricon. The integrated mesh layer shows an area around the US-Mexico border.

The world elevation service is used to show terrain while the integrated mesh layer loads.

Additional information

This sample requires a device that is compatible with ARKit.

Flyover AR is one of three main patterns for working with geographic information in augmented reality. See the Display scenes in augmented reality for more information.

This sample uses the ArcGIS Runtime Toolkit. See Display scenes in augmented reality in the guide to learn about the toolkit and how to add it to your app.

Tags

augmented reality, bird's eye, birds-eye-view, fly over, flyover, mixed reality, translation factor

Sample Code

ExploreScenesInFlyoverAR.cs
                                                                                                                                                                     
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// Copyright 2020 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.

using ArcGISRuntime;
using ARKit;
using Esri.ArcGISRuntime.ARToolkit;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.UI;
using Foundation;
using System;
using System.Linq;
using UIKit;

namespace ArcGISRuntimeXamarin.Samples.ExploreScenesInFlyoverAR
{
    [Register("ExploreScenesInFlyoverAR")]
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Explore scenes in flyover AR",
        category: "Augmented reality",
        description: "Use augmented reality (AR) to quickly explore a scene more naturally than you could with a touch or mouse interface.",
        instructions: "When you open the sample, you'll be viewing the scene from above. You can walk around, using your device as a window into the scene. Try moving vertically to get closer to the ground. Touch gestures which ",
        tags: new[] { "augmented reality", "bird's eye", "birds-eye-view", "fly over", "flyover", "mixed reality", "translation factor" })]
    public class ExploreScenesInFlyoverAR : UIViewController
    {
        // Hold references to UI controls.
        private ARSceneView _arSceneView;
        private UILabel _arKitStatusLabel;

        public ExploreScenesInFlyoverAR()
        {
            Title = "Explore scenes in flyover AR";
        }

        public override void LoadView()
        {
            // Create the views.
            View = new UIView() { BackgroundColor = ApplicationTheme.BackgroundColor };

            _arSceneView = new ARSceneView();
            _arSceneView.TranslatesAutoresizingMaskIntoConstraints = false;

            _arKitStatusLabel = new UILabel();
            _arKitStatusLabel.TranslatesAutoresizingMaskIntoConstraints = false;
            _arKitStatusLabel.TextAlignment = UITextAlignment.Center;
            _arKitStatusLabel.TextColor = UIColor.Black;
            _arKitStatusLabel.BackgroundColor = UIColor.FromWhiteAlpha(1.0f, 0.6f);
            _arKitStatusLabel.Text = "Setting up ARKit";

            // Add the views.
            View.AddSubviews(_arSceneView, _arKitStatusLabel);

            // Lay out the views.
            NSLayoutConstraint.ActivateConstraints(new[]
            {
                _arSceneView.TopAnchor.ConstraintEqualTo(View.TopAnchor),
                _arSceneView.BottomAnchor.ConstraintEqualTo(View.BottomAnchor),
                _arSceneView.LeadingAnchor.ConstraintEqualTo(View.LeadingAnchor),
                _arSceneView.TrailingAnchor.ConstraintEqualTo(View.TrailingAnchor),
                _arKitStatusLabel.TopAnchor.ConstraintEqualTo(View.SafeAreaLayoutGuide.TopAnchor),
                _arKitStatusLabel.LeadingAnchor.ConstraintEqualTo(View.LeadingAnchor),
                _arKitStatusLabel.TrailingAnchor.ConstraintEqualTo(View.TrailingAnchor),
                _arKitStatusLabel.HeightAnchor.ConstraintEqualTo(40)
            });

            // Listen for tracking status changes and provide feedback to the user.
            _arSceneView.ARSCNViewCameraDidChangeTrackingState += CameraTrackingStateChanged;
        }

        private async void Initialize()
        {
            // Create the scene.
            Scene flyoverScene = new Scene(new Uri("https://www.arcgis.com/home/item.html?id=76ffb1a9e26b4602a04c209146bf2cd3"));

            try
            {
                // Display the scene.
                await flyoverScene.LoadAsync();
                _arSceneView.Scene = flyoverScene;

                // Start with the camera at the scenes initial viewpoint.
                Camera originCamera = new Camera(flyoverScene.InitialViewpoint.Camera.Location.Y, flyoverScene.InitialViewpoint.Camera.Location.X, 200, 0, 90, 0);
                _arSceneView.OriginCamera = originCamera;

                // set the translation factor to enable rapid movement through the scene.
                _arSceneView.TranslationFactor = 1000;

                // Enable atmosphere and space effects for a more immersive experience.
                _arSceneView.SpaceEffect = SpaceEffect.Stars;
                _arSceneView.AtmosphereEffect = AtmosphereEffect.Realistic;
            }
            catch (Exception ex)
            {
                new UIAlertView("Error", ex.Message, (IUIAlertViewDelegate)null, "OK", null).Show();
                System.Diagnostics.Debug.WriteLine(ex);
            }
        }

        private void CameraTrackingStateChanged(object sender, ARSCNViewCameraTrackingStateEventArgs e)
        {
            // Provide clear feedback to the user in terms they will understand.
            switch (e.Camera.TrackingState)
            {
                case ARTrackingState.Normal:
                    _arKitStatusLabel.Hidden = true;
                    break;

                case ARTrackingState.NotAvailable:
                    _arKitStatusLabel.Hidden = false;
                    _arKitStatusLabel.Text = "ARKit location not available";
                    break;

                case ARTrackingState.Limited:
                    _arKitStatusLabel.Hidden = false;
                    switch (e.Camera.TrackingStateReason)
                    {
                        case ARTrackingStateReason.ExcessiveMotion:
                            _arKitStatusLabel.Text = "Try moving your device more slowly.";
                            break;

                        case ARTrackingStateReason.Initializing:
                            _arKitStatusLabel.Text = "Keep moving your device.";
                            break;

                        case ARTrackingStateReason.InsufficientFeatures:
                            _arKitStatusLabel.Text = "Try turning on more lights and moving around.";
                            break;

                        case ARTrackingStateReason.Relocalizing:
                            // This won't happen as this sample doesn't use relocalization.
                            break;
                    }

                    break;
            }
        }

        public override void ViewDidLoad()
        {
            base.ViewDidLoad();
            Initialize();
        }

        public override void ViewDidAppear(bool animated)
        {
            base.ViewDidAppear(animated);
            _arSceneView.StartTrackingAsync();
        }

        public override async void ViewDidDisappear(bool animated)
        {
            base.ViewDidDisappear(animated);
            if (_arSceneView != null)
            {
                await _arSceneView?.StopTrackingAsync();
            }
        }
    }
}

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