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Question by AhmedGalal1987 · Jul 17, 2017 at 06:21 AM · unity 5positioncoroutinemovetowards

How to move object repeatedly with Vector3.MoveTowards

So now i have a boat out of the camera and i want to implement this scenario :

1- When start game, waiting for 5 seconds then move the boat from position A to position B. 2- When boat reach position B the boat will get back to position A instantly.
3- Then wait for 5 seconds again and repeat 1 and 2 steps

And so on ..

alt text



This is my code but the problem that when start the game, the boat starting move without waiting seconds and once it reach to position B it get moved again and also increase its speed.

 // Use this for initialization
     void Start () {
         startPos = transform.position;
         moveBoats = MoveBoats ();
 
     }
     
     // Update is called once per frame
     void Update () {
         StartCoroutine (moveBoats);
         if (transform.position.x == boatEndPoint.transform.position.x) {
             transform.position = startPos;
         }
     }
 
     IEnumerator MoveBoats ()
     {
         while (true) {
             yield return new WaitForSeconds (5.0f);
             transform.position = Vector3.MoveTowards (transform.position, boatEndPoint.transform.position, speed * Time.deltaTime);
         }
     }

How can i fix that ??

captureboat.png (149.9 kB)
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Answer by SohailBukhari · Jul 17, 2017 at 07:01 AM

in the Start method just pass the points a and b and and time to move.Lets suppose you want to move from point a to point b within 5 seconds then yield return StartCoroutine(MoveObject(transform, pointA, PointB, 5.0f));

 public Vector3 PointB;
 
     IEnumerator Start()
     {
         var pointA = transform.position;
         while (true)
         {
             yield return StartCoroutine(MoveObject(transform, pointA, PointB, 3.0f));
             yield return StartCoroutine(MoveObject(transform, PointB, pointA, 3.0f));
         }
     }
 
     IEnumerator MoveObject(Transform thisTransform, Vector3 startPos, Vector3 endPos, float time)
     {
         yield return new WaitForSeconds(5f);// first yield return after five seconds as you want
         var i = 0.0f;
         var rate = 1.0f / time;
         while (i < 1.0f)
         {
             i += Time.deltaTime * rate;
             thisTransform.position = Vector3.Lerp(startPos, endPos, i);
             yield return null;
         }
     }

Arrange time when your boat come and at which speed.

you can also use MoveTowards Scripting API to move.

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