Whats wrong with this script?

Question

this is a moving platform script. it wont work..

     public Vector3 pointA;
     public Vector3 pointB;
 
     public float speed;
 
     void Start () {
         gameObject.transform.position = pointA;
     }
 
     // Update is called once per frame
     void Update () {
         if (gameObject.transform.position == pointA) {
             gameObject.transform.position = Vector3.MoveTowards(gameObject.transform.position, pointB, speed * Time.deltaTime);
         } 
         else if (gameObject.transform.position == pointB) {
             gameObject.transform.position = Vector3.MoveTowards(gameObject.transform.position, pointA, speed * Time.deltaTime);
         }
     }

I get no errors. the platform just wont move..

Answer 1

That is because you tell your platform to move towards pointB. So the first time you execute the Update loop, your position is equal to PointA and your platform will move a tiny little bit towards pointB, the next time you execute the Update loop, your position is not equal to PointA or pointB. Instead it is some Point in between, and thus your Update loop won't do anything after that...

I would suggest to change your code to something like this...

 public Vector3 pointA;
 public Vector3 pointB;
 
 public float speed;
 
 private Vector3 currentTarget;
 
 void Start ()
 {
     transform.position = pointA;
     currentTarget = pointB;
 }
 
 // Update is called once per frame
 void Update ()
 {
     transform.position = Vector3.MoveTowards(transform.position, currentTarget, speed * Time.deltaTime);
 
     // If we reach pointA or pointB, change target
     if (transform.position == currentTarget)
     {
         if (currentTarget == pointA)
             currentTarget = pointB;
         else
             currentTarget = pointA;
     }
 }

If it really doesn't even move the first Update loop, then either pointB is equal to pointA, speed is 0, or you have your script disabled... Either way, the problem I described above will still happen.

Whats wrong with this script?

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