Issue with Destroying Gameobjects

Questions & Answers
1

Hi, I need some guidance from the community.
I’ve made a scenario where an NPC will spawn from the spawn point and move towards the exit with the help of NavMesh. I got the spawning and the path-finding to work however I’m unable to destroy the game object when it reaches the exit. A screenshot is as attached:

155525-001.jpg
155525-001.jpg767×504 92.4 KB

Here are the codes I’ve used in this scene:
Spawning Script

public class NPC_Spawner : MonoBehaviour
{
    public GameObject npc;
    public GameObject exit;

    void Start ()
    {
        Invoke("SpawnNPC", 2);
    }

    public void SpawnNPC ()
    {
        GameObject na = (GameObject) Instantiate(npc, this.transform.position, Quaternion.identity);
        na.GetComponent<NPC_Behaviour>().exit = exit.transform;
        // if (na.transform.position == exit.transform.position)
        // {
        //     Destroy(na);
        //     Debug.Log("Collision Detected!!!");
        // }
        Invoke("SpawnNPC", Random.Range(2,5));
    }
}

NPC Behaviour Script

using UnityEngine;
using UnityEngine.AI;


public class NPC_Behaviour : MonoBehaviour
{
    public Transform exit;

    void Start()
    {
        UnityEngine.AI.NavMeshAgent agent = GetComponent<UnityEngine.AI.NavMeshAgent>();
        agent.destination = exit.position;
    }
}

Exit Script

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

public class NPC_Exit : MonoBehaviour
{
    void OnTriggerEnter(Collider col)
    {
        if (col.gameObject.tag == "NPC")
        {
            Debug.Log("Collision Detected");
            Destroy(col.gameObject);
        }        
    }
}

The box collider for exit is set ‘Is Trigger’.
Please let me know what I did wrong here. Your help is much appreciated.

2

Do either your exit or your NPC object have a Rigidbody? In order for OnTriggerEnter to be called, at least one of the colliding objects must have a Rigidbody. If this is the case, I would recommend putting a Rigidbody on the exit and unchecking gravity.

Hope this helps!