Enemy Detection Area

Questions & Answers
1

I got an enemy that follows the player and explodes on impact (Creeper from MineCraft).
Now the problem is that he follows the player as soon as the game starts, I want him to only follow the player when the player is close to him.
I tried to use an invisible box for the detection area but it didn’t work.
I get no errors, and I get no “detected!” print.

var target : Transform; 
var moveSpeed = 5; 
var rotationSpeed = 5; 
var myTransform : Transform; 
var Detect : boolean = false;


function Awake()
{
myTransform = transform; 
}

function Start()
{
target = GameObject.FindWithTag("Player").transform; 
}



function OnTriggerEnter(other : Collider)
{
if (other.tag == "Player")
{
Detect = true;
print ("detected!");
} 
}


function Update () {
   
   if (Detect == true)
   {
    myTransform.rotation = Quaternion.Slerp(myTransform.rotation,
    Quaternion.LookRotation(target.position - myTransform.position), rotationSpeed*Time.deltaTime); 
    myTransform.position += myTransform.forward * moveSpeed * Time.deltaTime;
   }
   }

also, If you got some other method I can use other than collision, please tell me.

2

Just compare your distance to the player distance each frame. If you want to be slightly more efficient, you can use distance squared.

function Update () {
 
   if ((target.transform.positon - transform.position).sqrMagnitude < someDistanceSquared)
       Detect = true;

   if (Detect)
   {
        myTransform.rotation = Quaternion.Slerp(myTransform.rotation,
        Quaternion.LookRotation(target.position - myTransform.position), rotationSpeed*Time.deltaTime); 
        myTransform.position += myTransform.forward * moveSpeed * Time.deltaTime;
   }

}