agent.cs

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

public class agent : MonoBehaviour
{
    private NavMeshAgent navMeshAgent;

    List<Transform> patrollingPoints = new List<Transform>();
    public Transform patrollPattern;


    bool isPatrol;

    public float minTimeForNextPatrol;
    public float maxTimeForNextPatrol;
    float nextTimeToPatrol;

    // Start is called before the first frame update
    void Start()
    {
        navMeshAgent = GetComponent<NavMeshAgent>();

        for (int i = 0; i < patrollPattern.childCount; i++)
        {
            patrollingPoints.Add(patrollPattern.transform.GetChild(i));
        }
    }

    // Update is called once per frame
    void Update()
    {
        Patrolling();
    }
    void Patrolling()
    {
        int i = Random.Range(0, patrollingPoints.Count);

        if (navMeshAgent.remainingDistance < 0.2f && nextTimeToPatrol<=0)
        {
            isPatrol = false;
        }
        else
        {
            isPatrol = true;
        }


        if (!isPatrol)
        {
            if (nextTimeToPatrol <= 0)
            {
                navMeshAgent.SetDestination(patrollingPoints[i].position);
                nextTimeToPatrol = Mathf.Round(Random.Range(minTimeForNextPatrol, maxTimeForNextPatrol));               
            }
            else
            {
                nextTimeToPatrol -= Time.deltaTime;
            }
        }
        else
        {
            nextTimeToPatrol -= Time.deltaTime;
        }
    }
}