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 //add ar core
    implementation 'com.google.ar:core:1.3.0'
    implementation 'com.google.ar.sceneform.ux:sceneform-ux:1.3.0'
    implementation 'com.google.ar.sceneform:core:1.3.0'
    
 //in top of file
apply plugin: 'com.google.ar.sceneform.plugin'

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<uses-feature android:name="android.hardware.camera.ar" android:required="true" />
<uses-permission android:name="android.permission.CAMERA" />

//and in <application> section:
<meta-data android:name="com.google.ar.core" android:value="required" />

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// in onResume:
try {
  if (mSession == null) {
    switch (ArCoreApk.getInstance().requestInstall(this, mUserRequestedInstall)) {
      case INSTALLED:
        mSession = new Session(this);
        // Success.
        break;
      case INSTALL_REQUESTED:
        // Ensures next invocation of requestInstall() will either return

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private fun loadAugmentedEarthImage(): Bitmap? {
    try {
        assets.open("earth.jpg").use { `is` -> return BitmapFactory.decodeStream(`is`) }
    } catch (e: IOException) {
        Log.e(TAG, "IO exception loading augmented image bitmap.", e)
    }

    return null
}

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private fun setupAugmentedImageDb(config: Config): Boolean {
    val augmentedImageDatabase = AugmentedImageDatabase(session)

    val augmentedEarthImageBitmap = loadAugmentedEarthImage() ?: return false

    augmentedImageDatabase.addImage("earth", augmentedEarthImageBitmap)

    config.augmentedImageDatabase = augmentedImageDatabase
    return true
}

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private fun configureSession() {
    val config = Config(session)
    if (setupAugmentedImageDb(config).not()) {
        messageSnackbarHelper.showError(this, "Could not setup augmented image database")
    }
    config.updateMode = Config.UpdateMode.LATEST_CAMERA_IMAGE
    session.configure(config)
}

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private fun onUpdateFrame() {
    frame = surfaceview.arFrame
    camera = frame.camera
    val updatedAugmentedImages = frame.getUpdatedTrackables(AugmentedImage::class.java)

    camera.getProjectionMatrix(projmtx, 0, 0.1f, 100.0f)
    camera.getViewMatrix(viewmtx, 0)

    for (augmentedImage in updatedAugmentedImages) {
        if (augmentedImage.trackingState == TrackingState.TRACKING) {

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surfaceview.scene.setOnUpdateListener { this.onUpdateFrame() }

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<android.opengl.GLSurfaceView
        android:id="@+id/surfaceviewGl"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="center"
        android:visibility="invisible"/>

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override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        surfaceviewGl.setZOrderOnTop(true)
        surfaceviewGl.preserveEGLContextOnPause = true
        surfaceviewGl.setEGLContextClientVersion(2)
        surfaceviewGl.holder.setFormat(PixelFormat.RGBA_8888);
        surfaceviewGl.setEGLConfigChooser(8, 8, 8, 8, 16, 0)
        surfaceviewGl.setRenderer(this)