How do we use sceneform along with ARCloud anchors? - arcore

Question

Every time I try to host an anchor "session.hostCloudAnchor(anchor);" it shows up NotTrackingException.
How can we host and resolve the Anchor that we get from arFragment.setOnTapArPlaneListener ?
This is the snippet of the code I was using,
arFragment.setOnTapArPlaneListener(
(HitResult hitResult, Plane plane, MotionEvent motionEvent) -> {
Camera camera = arFragment.getArSceneView().getArFrame().getCamera();
TrackingState cameraTrackingState = camera.getTrackingState();
if (andyRenderable == null) {
return;
}
if (plane.getType() != Type.HORIZONTAL_UPWARD_FACING) {
return;
}
if (cameraTrackingState == TrackingState.TRACKING && session!= null) {
// Create the Anchor.
anchor = hitResult.createAnchor();
try{
session.hostCloudAnchor(anchor);
}
catch (NotTrackingException e)
{
e.printStackTrace();
}
setNewAnchor(anchor);
appAnchorState = AppAnchorState.HOSTING;
Toast.makeText(HelloSceneformActivity.this, "Now, hosting anchor", Toast.LENGTH_SHORT)
.show();
AnchorNode anchorNode = new AnchorNode(anchor);
anchorNode.setParent(arFragment.getArSceneView().getScene());
// Create the transformable andy and add it to the anchor.
TransformableNode andy = new TransformableNode(arFragment.getTransformationSystem());
andy.setParent(anchorNode);
andy.setRenderable(andyRenderable);
andy.select();
checkUpdatedAnchor();
}
});

Answer 1

You need to check the anchor tracking state & proceed with hosting.
override fun onTapPlane(hitResult: HitResult, plane: Plane, motionEvent: MotionEvent?) {
if (plane.type == Plane.Type.HORIZONTAL_UPWARD_FACING) {
val anchor = hitResult.createAnchor()
val anchorNode = AnchorNode(anchor)
anchorNode.setParent(arFragment.arSceneView.scene)
if (anchor.trackingState == TrackingState.TRACKING) {
viewModel.hostAnchorToCloud(anchor)
}
}
}
Before hosting an anchor:
Try to look at the anchor from different angles.
Move around the anchor for at least a few seconds.
Make sure you are not too far away from the anchor.
Refer : https://developers.google.com/ar/develop/java/cloud-anchors/cloud-anchors-developer-guide-android