In AR Foundation, Can the object be automatically created without touching it?

Question

In ARFoundation - ARCore

When I hold my phone without touching the screen, can I automatically recognize the plane and make the object appear?

And make the object move alone? (self-moving)

Answer 1

Yes, you can absolutely do that.

1. Detect plane automatically:

Add AR Plane Manager script to your AR Session Origin

2. Place object automatically:

First way, use raycast from center of your screen

ARRaycastManager raycastManager; 
List<ARRaycastHit> hitList = new List<ARRaycastHit>();
Vector2 centerOfScreen = new Vector2(Screen.width / 2, Screen.height / 2);

raycastManager.Raycast(centerOfScreen, hitList, TrackableType.Planes);
if (hitList.Count > 0)
{
    // change it to make fit your logics
    Instantiate(objectPrefab, hitList[0].pose.position, hitList[0].pose.position);
}

Second way, you can use event planesChanged of ARPlaneManager to do it.

ARPlaneManager arPlaneManager

void OnEnable()
{
    ...
    arPlaneManager.planesChanged += PlaneChanged;
}

void OnDisable()
{
    ...
    arPlaneManager.planesChanged -= PlaneChanged;
}

private void PlaneChanged(ARPlanesChangedEventArgs args)
{
    if (args.added != null)
    {
        ARPlane arPlane = args.added[0];
        // change it to make fit your logics
        Instantiate(objectPrefab, arPlane.transform.position, Quaternion.identity); 
    }
}

Reference link: https://www.youtube.com/watch?v=oBKrdRI_NGI