Raycaster snippet used for Sky Lantern Festival Project

Raycaster snippet for lantern

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;
using System.IO;
using TMPro;
using Twity.DataModels.Core;
using Twity.DataModels.Responses;

public class LanternIdentifier : MonoBehaviour
{

	private Camera cam;
	private TextMeshProUGUI TMPGUI;
	private GameObject Lanterns;
	private string captionFadeState = "none";
	public bool enableCaptions = true;
	public float timeAlive = 7.0f;
    private float currentTimeAlive;
    public float timeToFade = 1.0f;
    private Tweet[] backupTweets;
    private string backupDataFileName = "data.json";
    public bool showCrosshair = false;


    // Use this for initialization
    void Start ()
	{
        // load fallback data
        LoadBackupData();
        cam = this.GetComponent<Camera> ();
		TMPGUI = GameObject.Find ("GUI Text").GetComponent<TextMeshProUGUI> ();
		TMPGUI.canvasRenderer.SetAlpha (0f);
		Lanterns = GameObject.Find ("Lanterns").gameObject;
        currentTimeAlive = timeAlive;
    }
	
	// Update is called once per frame
	void Update ()
	{
		// enable/disable captions
		if (OVRInput.GetDown(OVRInput.Button.One)) {
			enableCaptions = !enableCaptions;
			Debug.Log ("Captions " + (enableCaptions ? "Enabled!" : "Disabled!"));
		}

        // toggle crosshair visibility
        if (OVRInput.GetDown(OVRInput.Button.Two))
            showCrosshair = !showCrosshair;

        // Check if captions are enabled
        if (enableCaptions) {
			switch (captionFadeState) {
			case "in":
				currentTimeAlive -= Time.deltaTime;

				TMPGUI.CrossFadeAlpha (1f, timeToFade, false);

				if (currentTimeAlive <= timeToFade) {
					captionFadeState = "out";
				}
				break;
			case "out":
				currentTimeAlive -= Time.deltaTime;

				TMPGUI.CrossFadeAlpha (0f, timeToFade, false);

				if (currentTimeAlive <= 0) {
					captionFadeState = "none";
					currentTimeAlive = timeAlive;
					TMPGUI.SetText ("");
				}
				break;
			default:
				Ray ray = cam.ViewportPointToRay (new Vector3 (.5f, .5f));
				RaycastHit hit;
        // This is a bitwise operation that makes layer 8 the selected layer
        // layer 8 is where the lanterns are.
				int layerMask = 1 << 8;
				if (Physics.Raycast (ray, out hit, Mathf.Infinity, layerMask)) {
            // Get tweets form Lanterns GameObject
            if (Lanterns.GetComponent<GenerateLanterns>().tweets.Length > 0)
            {
                var tweets = new List<Tweet>(Lanterns.GetComponent<GenerateLanterns>().tweets);
                int tCount = tweets.Count;
                int randIndex = Random.Range(0, tCount - 1);
                Tweet someTweet = tweets[randIndex];
                ShowTweet(someTweet);

                // remove tweet from array
                tweets.RemoveAt(randIndex);
                Tweet[] tweetsArr = tweets.ToArray();
                Lanterns.GetComponent<GenerateLanterns>().tweets = tweetsArr;
            } else {
                var tweets = new List<Tweet>(backupTweets);
                int tCount = tweets.Count;
                int randIndex = Random.Range(0, tCount - 1);
                Tweet someTweet = tweets[randIndex];
                ShowTweet(someTweet);
            }
				}
				break;
			}
		} else {
            TMPGUI.canvasRenderer.SetAlpha(0f);
            captionFadeState = "none";
            currentTimeAlive = timeAlive;
            TMPGUI.SetText("");
        }

    }

	void ShowTweet (Tweet tweet)
	{
		string tHandle = tweet.user.screen_name;
		int maxChars = 105 - tHandle.Length;
		string text = (tweet.text.Length > (maxChars) ? tweet.text.Substring (0, maxChars) + "..." : tweet.text) + " @" + tHandle;
		TMPGUI.SetText (text);
        captionFadeState = "in";
	}

	void OnGUI ()
	{
        if (showCrosshair)
        {
            GUI.color = new Color(255, 255, 255, 1f);
            GUI.Box(new Rect(Screen.width / 2, Screen.height / 2, 10, 10), "");
        }
	}

    private void LoadBackupData()
    {
        string filePath = Path.Combine (Application.streamingAssetsPath, backupDataFileName);

        if (File.Exists(filePath))
        {
            string dataAsJson = File.ReadAllText(filePath);
            SearchTweetsResponse Response = JsonUtility.FromJson<SearchTweetsResponse>(dataAsJson);
            backupTweets = Response.statuses;
        }
    }
}