RecenterVR.cs

using UnityEngine;
using System.Collections;

public class RecenterVR : MonoBehaviour {

    // Use this for initialization
    void Start () {
        Cursor.visible = false;
    }
    
    // Update is called once per frame
    void Update () {
        if (Input.GetKeyDown(KeyCode.R))
        {
            UnityEngine.XR.InputTracking.Recenter();
        }
    }
}