How can you make a Instanciate prefab follow a scene object?

Question

Hello im new to Unity and im trying to make a scene in w$$anonymous$$ch if you activate a trigger a Ghost will appear and start to follow the player

t$$anonymous$$s is the code i have in a box that when the player touches it the trigger will activate

 public Transform Spawn;
     public GameObject Ghost;
     public GameObject Player;
     public int speed;    
     public bool Ismoving = false;
 
     void OnTriggerEnter()
     {
          Ismoving = true;
         Instantiate(Ghost,Spawn.position,Spawn.rotation);
 
     }
 
     void Update()
     {
         if (Ismoving == true)
         {
 
             Vector3 localPosition = Player.transform.position - transform.position;
             localPosition = localPosition.normalized;
             transform.Translate(localPosition.x * Time.deltaTime * speed, localPosition.y * Time.deltaTime * speed, localPosition.z * Time.deltaTime * speed);
         }
     }

Ghost is a obj w$$anonymous$$ch i made into a prefab. Spawn is a Null Object that is a c$$anonymous$$ld of the box, its just there to set the coordinates.

I tried to set the code in Update to the prefab but i cant reference the player because is in the scene

right now only the box follows me not the ghost Thanks for the help im really new to Unity

Answer 1

What you have to do is attac$$anonymous$$ng a script to the ghost to make $$anonymous$$m follow the player.

 // Your initial script
 public Transform Spawn;
 public Ghost GhostPrefab; // Drag & Drop the prefab with the Ghost script attached to it
 public GameObject Player;
 public int speed;    
 
 void OnTriggerEnter()
 {
    (Instantiate(GhostPrefab,Spawn.position,Spawn.rotation)).SetTarget( Player, speed ) ;
 
 }

 // The script to attach to the Ghost prefab
 public class Ghost : MonoBehaviour
 {
     private Transform target = null ;
     private float speed = 0 ;
     
     void Update()
     {
         if( target != null )
             transform.Translate((target.position - transform.position).normalized * speed * Time.deltaTime ) ;
     }
     
     public void SetTarget(GameObject newTarget, float chaseSpeed )
     {
         target = newTarget.transform;
         speed = chaseSpeed;
     }
     
 }

How can you make a Instanciate prefab follow a scene object?

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