Combining Multiple Behaviours (Wander and Follow)

Hi all,

I'm a newbie, hopefully I'm posting this in the right section.

I'm trying to learn to code simple character behaviors. I've created a small world where a zombie spawns and is supposed to walk to the player, if within a certain distance. Otherwise, it should just wander around.

I found a wandering script on the forums that works well. I also setup a sphere collider (with trigger) on the zombie, with script that causes it to follow the player if triggered. These behaviors work if run separately.

The problem is I can't seem to make the two behaviors work together. Ideally, I want something to the effect of "If within sphere then follower player, else wander". I can't figure out how to structure an if statement to achieve this. Any help would be appreciated. Thanks!

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEngine.AI;
5.  
6. public class ZombieBehaviour : MonoBehaviour
7. {
8.     public GameObject target;
9.     private UnityEngine.AI.NavMeshAgent zombieNav;
10.     public float wanderRadius;
11.     public float wanderTimer;
12.     private float timer;
13.  
14.     // Start is called before the first frame update
15.     void Start()
16.     {
17.         zombieNav = GetComponent<UnityEngine.AI.NavMeshAgent>();
18.         timer = wanderTimer;
19.     }
20.     // Update is called once per frame
21.     void Update()
22.     {
23.         timer += Time.deltaTime;
24.         if (timer >= wanderTimer)
25.         {
26.             Vector3 newPos = RandomNavSphere(transform.position, wanderRadius, -1);
27.             zombieNav.SetDestination(newPos);
28.             timer = 0;
29.         }
30.     }
31.     public static Vector3 RandomNavSphere(Vector3 origin, float dist, int layermask)
32.     {
33.         Vector3 randDirection = Random.insideUnitSphere * dist;
34.         randDirection += origin;
35.         UnityEngine.AI.NavMeshHit navHit;
36.         UnityEngine.AI.NavMesh.SamplePosition(randDirection, out navHit, dist, layermask);
37.         return navHit.position;
38.     }
39.     private void OnTriggerEnter(Collider other)
40.     {
41.         if (other.gameObject.tag == "Target")
42.         {
43.             zombieNav.SetDestination(target.transform.position);
44.         }
45.     }
46.  
47. }

 

You could use a boolean like "followPlayer" and set it to true inside triggerenter then in the update function if followPlayer is true move to player else wander

 

Thanks for your answer