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Instant Tracker

Related documentations
Tracker Coordinate System in Unity

The Instant Tracker instantly scans the planar surface in the camera frame and recognizes the space with sensors. You can find the rendered 3D object on the space.

Make Instant Tracker Scene
Start / Stop Tracker
Use Tracking Information
GitHub Unity Scene Example
Hardware Requirements for Android

Make Instant Tracker Scene

  1. [Install MAXST AR SDK for Unity.][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, InstantTrackable' to the scene.

    instantPrefab

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

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

    instantSample

  5. Create a Button, place it in the proper location, and register the OnClickStart () function of the InstantTrackerSample script in the Click Event.

    instantBtn

    instantDragObject

    instantClickEvent

  6. Drag the Text of the Button to the Start Btn Text of the Instant Tracker Sample script.

    instantText

  7. After creating a cube as a child of InstantTrakable, adjust the scale between 0.1 and 0.3.

    instantCube

  8. After Playing, click the button to learn the space instantly and augment the cube.

Start / Stop Tracker

To start / stop Tracker, refer to the following code.

>InstantTrackerSample.cs

void Update()
{
    ...
    TrackerManager.GetInstance().StartTracker(TrackerManager.TRACKER_TYPE_INSTANT);
    SensorDevice.GetInstance().Start();
    ...
}

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

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

Use Tracking Information

To use the Tracking information, refer to the following code.

>InstantTrackerSample.cs

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

    instantTrackable.OnTrackFail();

    if (trackingResult.GetCount() == 0)
    {
        return;
    }

    if (Input.touchCount > 0)
    {
        UpdateTouchDelta(Input.GetTouch(0).position);
    }

    Trackable trackable = trackingResult.GetTrackable(0);
    Matrix4x4 poseMatrix = trackable.GetPose() * Matrix4x4.Translate(touchSumPosition);
    instantTrackable.OnTrackSuccess(trackable.GetId(), trackable.GetName(), poseMatrix);
}

GitHub Unity Scene Example

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

More

  • ExtraInstantTrackerBrush
  • ExtraInstantTrackerGrid
  • ExtraInstantTrackerMultiContents

Hardware Requirements for Android

MAXST AR SDK's Instant Tracker uses internally Android Rotation Vector related to both gyro and compass sensors.

If your target device has no gyro or compass sensor, the engine can not find the initial pose. If there is no sensor value, our engine assumes the front scene as a ground plane.

If you want to check whether the current device support Android Rotation Vector, please refer to the following codes.

 
SensorManager mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
List<Sensor> sensors = mSensorManager.getSensorList(TYPE_ROTATION_VECTOR);
Log.i(TAG, "# sensor : " + sensors.size());
for(int i=0; i<sensors.size(); i++)
{
   Log.i(TAG, sensors.get(i).getName());
}
if(sensors.isEmpty())
{
   Log.i(TAG,"There is no Rotaion Vector");
}

Devices that do not support the Android Rotation Vector

Samsung Galaxy J5, Moto G5 Plus, Moto G4 Plus, Iball Andi 5U, Geonee S +