Question Unity Stuck on EnterPlayMode

My Unity is getting stuck at EnterPlayMode when i press the Play Button. Why does this happen?

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using Unity.VisualScripting;
4. using UnityEngine;
5. using UnityEngine.AI;
6.  
7. public class WalkTowardsCylinder : MonoBehaviour
8. {
9.     [SerializeField] private Vector3 StartPos;
10.     [SerializeField] private NavMeshAgent Agent;
11.     [SerializeField] private Transform[] Parkinglot1;
12.     [SerializeField] private Transform[] Parkinglot2;
13.     [SerializeField] private Transform[] Parkinglot3;
14.     [SerializeField] private float randomSelection;
15.     private int waypointindex = 0;
16.  
17.     // Start is called before the first frame update
18.     void Start()
19.     {
20.         Agent = GetComponent<NavMeshAgent>();
21.         SearchParkinglot();
22.     }
23.  
24.     // Update is called once per frame
25.     void Update()
26.     {
27.  
28.     }
29.  
30.     void SearchParkinglot()
31.     {
32.         randomSelection = Random.Range(0,2);
33.         if (randomSelection == 0)
34.         {
35.             while (Vector3.Distance(transform.position, Parkinglot1[waypointindex].position) > 0.2f)
36.             {
37.                 Agent.SetDestination(Parkinglot1[waypointindex].position);
38.             }
39.      
40.             print("finished");
41.             Agent.SetDestination(transform.position);
42.             transform.rotation = Parkinglot1[waypointindex].rotation;
43.             waypointindex++;
44.         }
45.         if (randomSelection == 1)
46.         {
47.             while (Vector3.Distance(transform.position, Parkinglot2[waypointindex].position) > 0.2f)
48.             {
49.                 Agent.SetDestination(Parkinglot2[waypointindex].position);
50.             }
51.  
52.             print("finished");
53.              Agent.SetDestination(transform.position);
54.             transform.rotation = Parkinglot2[waypointindex].rotation;
55.             waypointindex++;
56.         }
57.         if (randomSelection == 2)
58.         {
59.             while (Vector3.Distance(transform.position, Parkinglot3[waypointindex].position) > 0.2f)
60.             {
61.                 Agent.SetDestination(Parkinglot3[waypointindex].position);
62.             }
63.  
64.             print("finished");
65.             Agent.SetDestination(transform.position);
66.             transform.rotation = Parkinglot3[waypointindex].rotation;
67.             waypointindex++;
68.         }
69.     }
70. }
71.  

 

Usually this means you have an infinite loop. So my guess is it's hitting one of your while statements and just getting stuck looping forever.

 

i was reading that in a other forum post, but i don't know why it's getting stuck in that loop. it should just go to the position while it's distance is over 0.2f.

 

All 3 of your "while" loops are infinite loops. As long as that code is executing, the rest of the engine can't process a single frame. Therefore NavAgent isn't moving, therefore the position can't change, therefore the while condition remains true forever, therefore, infinite loop.

Looking at this, I think your intention is that SearchParkingLot() would execute across time, and act as your AI's "patrol" loop? If so, it needs to be a coroutine. That looks like this:

Code (csharp):

1.  
2. void Start()
3.     {
4.         Agent = GetComponent<NavMeshAgent>();
5.         StartCoroutine(SearchParkinglot());
6.     }
7.  
8. IEnumerator SearchParkingLot() {

And anytime you want the engine to wait for a frame, insert this line:

Code (csharp):

1. yield return null;

You need a yield line inside every while loop.

 

it works! Thank you so much. i need to learn more about unity ^^

 

i am so confused. i want to make an idle tycoon game and i am making a system to park vehicles at a parkinglot, but i cant find out how to set the parkinglot occupied so that other cars cant choose that parkinglot. Because when i do, the parked car on it just does the same thing as the others. Search a new spot.

 

or first, to drive up to them and then park

 

Finally i got it working

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using Unity.Mathematics;
4. using Unity.VisualScripting;
5. using UnityEngine;
6. using UnityEngine.AI;
7. using Random = UnityEngine.Random;
8.  
9. public class ParkingSystem : MonoBehaviour
10. {
11.     [SerializeField] private NavMeshAgent Agent;
12.     [SerializeField] private NavMeshObstacle Obstacle;
13.     [SerializeField] private Transform[] Parkinglots;
14.     private GameObject Customer;
15.     [SerializeField] private GameObject CustomerPrefab;
16.     private int rand;
17.  
18.     // Start is called before the first frame update
19.     void Start()
20.     {
21.         Agent = GetComponent<NavMeshAgent>();
22.         Obstacle = GetComponent<NavMeshObstacle>();
23.         StartCoroutine(SearchParkingSpot());
24.     }
25.  
26.     // Update is called once per frame
27.     void Update()
28.     {
29.        
30.     }
31.  
32.     IEnumerator SearchParkingSpot()
33.     {
34.         rand = Random.Range(0, Parkinglots.Length);
35.         for (int i = 0; i < Parkinglots.Length; i++)
36.         {
37.             while (Parkinglots[rand].gameObject.name.Contains("Not"))
38.             {
39.                 while (Vector3.Distance(Agent.transform.position, Parkinglots[rand].transform.position) <= 0.2f)
40.                 {
41.                     Parkinglots[rand].gameObject.name = "Occupied";
42.                     Agent.SetDestination(transform.position);
43.                     Obstacle.enabled = true;
44.                     transform.rotation = Parkinglots[rand].rotation;
45.                     if (transform.rotation == Quaternion.Euler(0f,90f,0f))
46.                     {
47.                         Customer = Instantiate(CustomerPrefab,
48.                             new Vector3(transform.position.x+3, transform.position.y, transform.position.z),
49.                             Quaternion.identity);
50.                         Customer.transform.rotation = Quaternion.Euler(transform.rotation.x, transform.rotation.y - 90,
51.                             transform.rotation.z);
52.                     }else if (transform.rotation == Quaternion.Euler(0f, -90f, 0f))
53.                     {
54.                         Customer = Instantiate(CustomerPrefab,
55.                             new Vector3(transform.position.x-3, transform.position.y, transform.position.z),
56.                             Quaternion.identity);
57.                         Customer.transform.rotation = Quaternion.Euler(transform.rotation.x, transform.rotation.y + 90,
58.                             transform.rotation.z);
59.                     }
60.                     yield return null;
61.                 }
62.                 Agent.SetDestination(Parkinglots[rand].position);
63.                 yield return null;
64.             }
65.             rand = Random.Range(0, Parkinglots.Length);
66.             Agent.SetDestination(Parkinglots[rand].position);
67.         }
68.         yield return null;
69.     }
70.  
71.    
72. }
73.  

 

How do you force unity to stop entering play mode when it gets stuck?

 

Don't programm infinite loops? Or: https://assetstore.unity.com/packages/tools/utilities/emergency-exit-194959