RaycastExample.c

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Controller : MonoBehaviour
{

    public string selection;
    // Use this for initialization
    void Awake()
    {
        selection = null;
    }

    // Update is called once per frame
    void Update()
    {
        // in Hololens project, the Camera represents your gaze
        // Camera.main.transform.forward is a normal vector representing which way hololens is pointing ('gaze')
        var headPosition = Camera.main.transform.position;
        var gazeDirection = Camera.main.transform.forward;

        RaycastHit hitInfo;
        // Check if Ray is colliding with anything, if it hits something, store reference in hitInfo
        if (Physics.Raycast(headPosition, gazeDirection, out hitInfo))
        {
            var topOfLabel = hitInfo.collider.gameObject;
            var thisBox = topOfLabel.transform.GetChild(1).gameObject;
            selection = topOfLabel.name;
            // Might be a better way to do this, I'm just iterating through 
            // list of all boxes and deactivating them. Could probably keep a reference to selected box and just deactivate that.
            var allBoxes = GameObject.FindGameObjectsWithTag("box");
            foreach (GameObject box in allBoxes)
            {
                box.SetActive(false);
            }
            // before activating the box that my gaze collides with
            thisBox.SetActive(true);
            // for debugging, print label of whatever object I'm looking at
            print(selection);
        }
        else
        {
            print("no hit");
        }

    }
}