Can I run ARCore Preview 1 App on Preview 2 release?

Question

I've built an app which runs on ARCOre preview 1 package on Unity. I know Google has made major changes in preview 2. My question is what changes will I have to make in order to run my ARCore preview 1 app run on preview 2?

Answer 1

Take a look at the code in the Preview 2 sample app(s) and update your code accordingly. For example, here is the new code for properly instantiating an object into the AR scene:

if (Session.Raycast(touch.position.x, touch.position.y, raycastFilter, out hit))
            {
                var andyObject = Instantiate(AndyAndroidPrefab, hit.Pose.position,
                    hit.Pose.rotation);

                // Create an anchor to allow ARCore to track the hitpoint 
                // as understanding of the physical world evolves.
                var anchor = hit.Trackable.CreateAnchor(hit.Pose);

                // Andy should look at the camera but still be flush with the plane.
                andyObject.transform.LookAt(FirstPersonCamera.transform);
                andyObject.transform.rotation = Quaternion.Euler(0.0f,
                    andyObject.transform.rotation.eulerAngles.y,
                       andyObject.transform.rotation.z);

                // Make Andy model a child of the anchor.
                andyObject.transform.parent = anchor.transform;
             }