Deteksi Jarak

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using Vuforia;

public class WeldingOnOff : MonoBehaviour {

    // Initialize Welding Button
    public Button WeldingBtn;

    // Initialize Spark Object
    public GameObject Spark;
    public AudioSource SparkSound;

    // Initialize Fire Object
    public GameObject Fire;

    public Text Guide;
    public AudioSource Selesai;

    // Mode
    //public GameObject TwoF;
    //public GameObject TwoG;
    //public string mode;

    // Initialize Trigger
    public bool WeldingOn;

    // Setup range limit
    public float range = 1f;

    // Setup raycast hit
    RaycastHit hit;

    // Camera
    public Camera camera;


    void OnEnable()
    {
        // Register Button Events
        WeldingBtn.onClick.AddListener(() => buttonCallBack(WeldingBtn));

    }

    private void buttonCallBack(Button buttonPressed)
    {
        if (buttonPressed == WeldingBtn)
        {
            WeldingOn = !WeldingOn;
        }
    }

    void OnDisable()
    {
        // Un-Register Button Events
        WeldingBtn.onClick.RemoveAllListeners();
    }

    // Start is called before the first frame update
    void Start()
    {
        Spark.SetActive(false);
        Fire.SetActive(false);
    }

    // Update is called once per frame
    void Update()
    {
        if (WeldingOn)
        {
            Fire.SetActive(true);

            // Get the Vuforia StateManager
            StateManager sm = TrackerManager.Instance.GetStateManager();

            // Query the StateManager to retrieve the list of
            // currently 'active' trackables
            //(i.e. the ones currently being tracked by Vuforia)
            IEnumerable<TrackableBehaviour> activeTrackables = sm.GetActiveTrackableBehaviours();

            foreach (TrackableBehaviour tb in activeTrackables)
            {
                var jarak = Vector3.Distance(camera.transform.position, tb.gameObject.transform.position);
                Debug.Log("Jarak:" + jarak);
                Debug.Log("X:" + (camera.transform.position.x - tb.gameObject.transform.position.x));
                Debug.Log("Y:" + (camera.transform.position.y - tb.gameObject.transform.position.y));
                Debug.Log("Z:" + (camera.transform.position.z - tb.gameObject.transform.position.z));

                if (tb.name == "Marker2F")
                {
                    //detek jarak 2f
                    if (jarak <= 450)
                    {
                        Spark.SetActive(true);
                        SparkSound.Play();
                    }
                    else if (jarak >= 450)
                    {
                        Spark.SetActive(false);
                        SparkSound.Stop();
                        Guide.text = "Pengelasan 2F Selesai";
                        Selesai.Play();
                        Selesai.Stop();
                    }
                    else
                    {
                        Spark.SetActive(false);
                        SparkSound.Stop();
                    }
                }

                if(tb.name == "Marker2G")
                {
                    //detek jarak 2g
                    if ((jarak >= 192) && (jarak <= 270))
                    {
                        Spark.SetActive(true);
                        SparkSound.Play();
                    }
                    else if (jarak >= 270)
                    {
                        Spark.SetActive(false);
                        SparkSound.Stop();
                        Guide.text = "Pengelasan 2G Selesai";
                        Selesai.Play();
                        Selesai.Stop();
                    }
                    else
                    {
                        Spark.SetActive(false);
                        SparkSound.Stop();
                    }

                }
            }
        }
        else
        {
            Spark.SetActive(false);
            Fire.SetActive(false);
        }
    }
}