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Instant Tracker

Related documentations
Tracker Coordinate System

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.

Create Instants
Start / Stop Tracker
Use Tracking Information
Create Instant Target Data

Create Instants

>InstantTrackerViewController.mm

- (void)viewDidLoad
{
    ...
    trackingManager = [[MasTrackerManager alloc] init];
    cameraDevice = [[MasCameraDevice alloc] init];
    sensorDevice = [[MasSensorDevice alloc] init];
}

Start / Stop Tracker

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

>InstantTrackerViewController.mm

- (void)resumeAR
{
    ...
    [trackingManager startTracker:TRACKER_TYPE_INSTANT];
}

- (void)pauseAR
{
    [trackingManager stopTracker];
    ...
}

Use Tracking Information

To augment an object using Tracking results, refer to the following code.

>InstantTrackerViewController.mm

- (void)glkView:(GLKView *)view drawInRect:(CGRect)rect
{
    ...
    MasTrackingState *trackingState = [trackingManager updateTrackingState];
    MasTrackingResult *result = [trackingState getTrackingResult];
    
    MasTrackedImage *trackedImage = [trackingState getImage];
    [backgroundCameraQuad draw:trackedImage projectionMatrix:[cameraDevice getBackgroundPlaneProjectionMatrix]];
    
    glEnable(GL_DEPTH_TEST);
    matrix_float4x4 projectionMatrix = [cameraDevice getProjectionMatrix];
    
    for (int i = 0; i < [result getCount]; i++)
    {
        MasTrackable *trackable = [result getTrackable:i];
        
        [texturedCube setProjectionMatrix:projectionMatrix];
        [texturedCube setPoseMatrix:[trackable getPose]];
        [texturedCube setTranslation:panTranslateX y:panTranslateY z:-0.05f];
        [texturedCube setScale:0.3f + pinchScale y:0.3f + pinchScale z:0.01f];
        [texturedCube draw];
    }
    ...
}

Create Instant Target Data

You can create new data only when it is not in Tracking state. Refer to the following code.

>InstantTrackerViewController.mm

- (IBAction)doTrackingState:(id)sender {
    UIButton **button = (UIButton**)sender;
    
    if([[[button titleLabel] text]  isEqual: @"Start Tracking"])
    {
        beforeTranslateX = 0.0f;
        beforeTranslateY = 0.0f;
        panTranslateX = 0.0f;
        panTranslateY = 0.0f;
        pinchScale = 0.0f;
        rotateValue = 0.0f;
        
        [trackingManager findSurface];
        [button setTitle:@"Stop Tracking" forState:UIControlStateNormal];
    }
    else if([[[button titleLabel] text]  isEqual: @"Stop Tracking"])
    {
        [trackingManager quitFindingSurface];
        [button setTitle:@"Start Tracking" forState:UIControlStateNormal];
    }
}