The Map Download Sample

This sample shows how to download, switch and use the constructed map at runtime.

This sample requires a valid Developer Token from our Developer Portal.

Open the MapDownloadSample scene found in the Assets/ImmersalSDK/Samples/Scenes folder.

Using Your Maps

You can log in to the Developer Portal and download a map file if you wish to also embed a map into the sample.

But in this sample all your constructed maps are available in the app itself.

Overview of the scene

The scene is very similar to the Multimap sample.

AR Session, AR Session Origin and AR Camera

Game objects provided by AR Foundation and you can find more about their functionalities from Unity's documentation. They provide the basic functionalities for the AR session.

ImmersalARCloudSDK

Basic settings for our SDK and the ARLocalizer.cs script.

  • Developer Token is where you need to insert your token found in our Developer Portal.

  • Target Frame Rate for the app. iOS can manage 60fps, but most Android devices are locked to 30fps.

  • Android Resolution specifies the image size used by our SDK computer vision. Some older Android devices have performance issues with bigger image sizes so you can change this if needed.

  • iOS Resolution is the same setting, but for iOS devices. You can leave this at default, which for most devices is the maximum resolution.

AR Localizer is the script that uses our SDK to find the device pose within the map.

  • Localization Interval sets the interval between attempted localizations. At the app start, the script has an automatic burst mode to find the first ten or so poses as fast as possible.

  • Downsample reduces the image size for improved performance.

  • Debug Text is an optional reference to a TextMeshProUGUI object to display localization attempt information.

EventSystem and Canvas

These are components of Unity's UI system. The debug text displays the successful and total localization attempts.

The Pose Indicator is a prefab that gives an estimate of the current localization status. The prefab displays a red icon when no poses have been found or it has been a long time since the previous found pose. It also resets when AR Foundation loses tracking. When the SDK finds multiple poses, the indicator turns green.

The Pose Indicator also has events for OnPoseFound and OnPoseLost that can be used to trigger actions in an AR app.

The Maps Dropdown game object is located under the Canvas. It needs a reference to a AR Map game object where the downloaded maps will be inserted. It contains all functionality needed to download and switch maps at runtime.

AR Space and AR Maps

These game objects are used by our SDK to transform the AR content to match the real-world.

When a pose is found by ARLocalizer.cs, the AR Space is transformed in a way that the AR content visually matches the real-world. The AR Camera in the scene is not transformed, but the AR Space is brought to the camera.

Map files in AR Maps are used to move the parent AR Space object. Every AR Map needs to have a parent AR Space object. If one does not exist, it will be created at runtime.

  • Map File is where you place your .bytes map data files available from the Developer Portal. If you want to embed a map file into the app, insert it here.

  • Color changes the color of the preview point cloud.

  • Render Mode sets the visibility of the preview point cloud. You can disable or render it in Editor and/or at runtime.

Using the sample

  1. Place your downloaded map file into the AR Map game object's map file slots in the inspector.

  2. Open Build Settings (Ctrl + Shift + B) and make sure only the MapDownloadSample is included in the Scenes in Build.

  3. Change your Player Settings if necessary. It's a good idea to change the Product Name and Package Name so the app will not overwrite a previously installed app on your device.

  4. Build the app and install it to your devices.

When you start the app and look around at a location you have mapped, the device should localize and find a pose in just seconds.

If you click the dropdown menu, you can download and switch to other maps.