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Image Tracker

Related documentations
Target Manager
Recommended Conditions for Target Images
Tracker Coordinate System in Unity

The Image Tracker recognizes and tracks planar images. It can demonstrate not only 3D objects but also videos, even the transparent one.

Make Image Tracker Scene
Set Target Image
Add / Replace Target Image
Start / Stop Tracker
Use Tracking Information
Change Tracking Mode
GitHub Unity Scene Example

Make Image Tracker Scene

  1. Install MAXST AR SDK for Unity.

  2. Create a new scene.

  3. Delete the Main Camera that exists by default and add 'Assets > MaxstAR > Prefabs > ARCamera, ImageTrackable' to the scene.

    imagePrefab

    ※ If you build, you should add License Key to ARCamera.

  4. Create an empty object and add 'Assets > MaxstARSamples > Scripts > ImageTrackerSample' as a component.

    imageSample

  5. Drag a Assets > StreamingAssets > MaxstAR > ImageTarget > sample map file to the Inspector of ImageTrackable to set the map.

  6. In the ImageTrackable's Inspector, drag and drop 'Assets > StreamingAssets > MaxstAR > Sample > Sample Map File'

    imageMap

  7. Create a cube as a child of ImageTrakable and adjust its size and position.

    imageCube

  8. The cube will be augmented by illuminating the target image to the camera after Play.

    ※ Target image file is located in 'Assets > Editor > MaxstAR > Textures > ImageTarget' folder.

Set Target Image

By calling addTrackerData () to register the map file and calling loadTrackerData (), target image can be tracked. To set a target image, refer to the following code.

>ImageTrackerSample.cs

private void AddTrackerData()
{
    foreach (var trackable in imageTrackablesMap)
    {
        if (trackable.Value.TrackerDataFileName.Length == 0)
        {
            continue;
        }

        if (trackable.Value.StorageType == StorageType.AbsolutePath)
        {
            TrackerManager.GetInstance().AddTrackerData(trackable.Value.TrackerDataFileName);
        }
        else
        {
            if (Application.platform == RuntimePlatform.Android)
            {
                TrackerManager.GetInstance().AddTrackerData(trackable.Value.TrackerDataFileName, true);
            }
            else
            {
                TrackerManager.GetInstance().AddTrackerData(Application.streamingAssetsPath + "/" + trackable.Value.TrackerDataFileName);
            }
        }
    }

    TrackerManager.GetInstance().LoadTrackerData();
}

Add / Replace Target Image

  1. Create a map file refer to Target Manager.

  2. Download the file you created.

  3. Import the downloaded file.

  4. Set a target image.

Start / Stop Tracker

After loading the map, refer to the following code to start / stop the tracker.

>ImageTrackerSample.cs

void Update()
{
    ...
    TrackerManager.GetInstance().StartTracker(TrackerManager.TRACKER_TYPE_IMAGE);
    ...
}

void OnApplicationPause(bool pause)
{
    ...
    TrackerManager.GetInstance().StopTracker();
    ...
}

void OnDestroy()
{
    ...
    TrackerManager.GetInstance().StopTracker();
    TrackerManager.GetInstance().DestroyTracker();
}

Use Tracking Information

Refer to the following code to use the tracking information.

>ImageTrackerSample.cs

void Update()
{
    ...
    TrackingState state = TrackerManager.GetInstance().UpdateTrackingState();
    TrackingResult trackingResult = state.GetTrackingResult(); 

    for (int i = 0; i < trackingResult.GetCount(); i++)
    {
        Trackable trackable = trackingResult.GetTrackable(i);
        imageTrackablesMap[trackable.GetName()].OnTrackSuccess(trackable.GetId(), trackable.GetName(), trackable.GetPose());
    }
}

Change Tracking Mode

5 Tracking Modes of Image Tracker:

NORMAL_TRACKING, EXTENDED_TRACKING, MULTI_TRACKING, JITTER_REDUCTION_ACTIVATION, JITTER_REDUCTION_DEACTIVATION

  • NORMAL_TRACKING: Default Setting. Traceable one target image.
TrackerManager.GetInstance().SetTrackingOption(TrackerManager.TrackingOption.NORMAL_TRACKING);
  • EXTENDED_TRACKING: Traceable even at the far distance from the target image.
TrackerManager.GetInstance().SetTrackingOption(TrackerManager.TrackingOption.EXTEND_TRACKING);
  • MULTI_TRACKING: Possible to recognize and track up to three target images at the same time.
TrackerManager.GetInstance().SetTrackingOption(TrackerManager.TrackingOption.MULTI_TRACKING);
  • JITTER_REDUCTION_ACTIVATION: Jitter reduction.
TrackerManager.GetInstance().SetTrackingOption(TrackerManager.TrackingOption.JITTER_REDUCTION_ACTIVATION);
  • JITTER_REDUCTION_DEACTIVATION: Disable the jitter reduction option.
TrackerManager.GetInstance().SetTrackingOption(TrackerManager.TrackingOption.JITTER_REDUCTION_DEACTIVATION);

GitHub Unity Scene Example

GitHub Unity Scene Example: https://github.com/maxstdev/MaxstARSDK_Unity_Sample.git

More

  • ExtraImageTrackerKnight
  • ExtraImageTrackerMultiTarget