Finding multiple gameobjects with tag error

Questions & Answers
1

Ok i have multiple enemies and multiple players in my scene. My problem was that when i an enemy killed a player they would stop searching for players tagged “playerguy”. So i tried changing GameObject.FindWithTag(“PlayerGuy”).Transform to GameObject.FindGameObjectsWithTag(“PlayerGuy”).Transform. Problem is i get this error

`Assets/TankMan/TankManScripts/EnemyScripts/Lvl1TerroristAI.js(29,74):
BCE0019: ‘transform’ is not a member
of ‘UnityEngine.GameObject’.

I understand why im getting this error, I just dont know how to fix it. If anyone can point me in the direction of fixing the problem that would be great.

    static var target1 : Transform;
    var moveSpeed : int = 6;  // chase speed
    var rotationSpeed : int = 1;  // speed to turn to the player
    var maxDistance : int = 10;  // attack distance
    var minDistance : int = 15;  // detection distance
    
    private var myTransform : Transform;
    
    function Awake() {
        myTransform = transform;
    }
    
    // Cache the controller 
    private var characterController : CharacterController; 
    characterController = GetComponent(CharacterController);
    
    function Start () { 
        target1 = GameObject.FindWithTag ("PlayerGuy").transform; 
        maxDistance = 2;
       
    }
    
    //------------------------------------------------------------------ 

    function Update(){
	if (target1 == null){
		target1 = GameObject.FindGameObjectsWithTag("PlayerGuy").transform;
        if (target1) {
        var dist = Vector3.Distance(target1.position, transform.position);
        if (dist > minDistance){  // if dist > minDistance: enters idle mode
            Idle(); 
        }
        else
        if (dist <= maxDistance) {  // if dist <= maxDistance: stop and attack		
            print ("Attack!");

        } 
        else {  // if maxDistance < dist < minDistance: chase the player
          //  print ("I found you "+ dist);
            myTransform.rotation = Quaternion.Slerp(myTransform.rotation,
            Quaternion.LookRotation(target1.position - 										myTransform.position) , rotationSpeed * Time.deltaTime);
            
            // Move towards target
            characterController.Move(myTransform.forward * moveSpeed * Time.deltaTime);
            //
            //
        }
         if (dist <= maxDistance){
             myTransform.rotation = Quaternion.Slerp(myTransform.rotation,
            Quaternion.LookRotation(target1.position - 										myTransform.position) , rotationSpeed * Time.deltaTime);
            }
    	}
    }
    }

//------------------------------------------------------------------

    var walkSpeed = 3.0; 
    var directionTraveltime = 2.0;
    var idleTime = 1.5; 
    var rndAngle = 45; 
    // enemy will turn +/- rndAngle
    
    private var timeToNewDirection = 0.0; 
    private var turningTime = 0.0; 
    private var turn: float;
    
    function Idle () { 
        // Walk around and pause in random directions unless the player is within range 
        if (Time.time > timeToNewDirection) { 
          // time to change direction? 
          if(Random.value > 0.5) // choose new direction 
              turn = rndAngle; 
         else { turn = -rndAngle; }
         turningTime = Time.time + idleTime; 
         // will stop and turn during idleTime... 
         timeToNewDirection = turningTime + directionTraveltime; 
         // and travel during directionTraveltime
       } 
       if (Time.time < turningTime) { 
           // rotate during idleTime... 
          transform.Rotate(0, turn*Time.deltaTime/idleTime, 0); 
       } else { 
          // and travel until timeToNewDirection 
          characterController.SimpleMove(transform.forward * walkSpeed); 
       }
    }

    function OnCollisionEnter(collision : Collision) { 
        transform.Rotate(0, turn*Time.deltaTime/idleTime, 0); 
    }
2

The problem is that you can’t access the Transform of a collection of GameObjects like that. You have an array of GameObjects that you found with FindGameObjectsWithTag(). To access a specific one, you need a specific GameObject, now there are a number of ways to do this.

 //The easiest
 var gOs = GameObject.FindGameObjectsWithTag("PlayerGuy");
 target1 = gOs[0].transform;
 //Get the first element in the array.

or convert the entire array. If you only need one element, this might be a waste of memory.

 //C#.
 var gOs = GameObject.FindGameObjectsWithTag("");
 var targets = Array.ConvertAll<GameObject , Transform>( gOs ,  x => x.transform );
3

hmm in runtime i get a null reference exception object reference not set to an instance of an object. and nothing shows up in the inspector to set…

4

Got help from someone on the scripting forums and figured it out

function Update () {

var target1 : Transform;
var gOs = GameObject.FindGameObjectsWithTag("PlayerGuy");

if (gOs.Length > 0) {
    var closestDistance : float=Mathf.Infinity;
   for(var g : GameObject in gOs) {
        var distance : float = Vector3.Distance (transform.position, g.transform.position);

        if (distance < closestDistance) {
            target1 = g.transform;
            closestDistance = distance;
        	}
        }
    }