Move Transform to Target in X seconds

Question

 public Transform a;
 public Transform target;
 public float x = 30f; //amount of seconds for A to reach Target

I have a Transform A and a Transform target. My goal is to make A reach Target in x seconds. I have tried both Vector3.Lerp and Vector3.MoveTowards but can not figure out the problem.

Answer 1

Best Answer

Answer by whydoidoit · Aug 04, 2012 at 11:05 PM

Ok so Lerp will move you there in a guaranteed amount of time, but you need to record the starting position - which is trickier in Update.

    float t;
    Vector3 startPosition;
    Vector3 target;
    float timeToReachTarget;

     void Start()
     {
             startPosition = target = transform.position;
     }

     void Update() 
     {
             t += Time.deltaTime/timeToReachTarget;
             transform.position = Vector3.Lerp(startPosition, target, t);
     }

     public void SetDestination(Vector3 destination, float time)
     {
            t = 0;
            startPosition = transform.position;
            timeToReachTarget = time;
            target = destination; 
     }

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Ronin6 · Aug 04, 2012 at 11:37 PM 0

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Thanks a lot. After lots of hacking at my code I finally got it working correctly.

whydoidoit · Aug 04, 2012 at 11:40 PM 3

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It's easier in a coroutine because you can keep it all nicely in one place.

  public IEnumerator MoveToPosition(Transform transform, Vector3 position, float timeToMove)
   {
      var currentPos = transform.position;
      var t = 0f;
       while(t < 1)
       {
             t += Time.deltaTime / timeToMove;
             transform.position = Vector3.Lerp(currentPos, position, t);
             yield return null;
      }
    }

Answer 2

Answer by Lakeffect · Feb 25, 2016 at 08:27 AM

Move any object to any place at any speed (units/seconds) or in any time -- all done without using Update:

  StartCoroutine (MoveOverSeconds (gameObject, new Vector3 (0.0f, 10f, 0f), 5f));

  public IEnumerator MoveOverSpeed (GameObject objectToMove, Vector3 end, float speed){
     // speed should be 1 unit per second
     while (objectToMove.transform.position != end)
     {
         objectToMove.transform.position = Vector3.MoveTowards(objectToMove.transform.position, end, speed * Time.deltaTime);
         yield return new WaitForEndOfFrame ();
     }
 }

 public IEnumerator MoveOverSeconds (GameObject objectToMove, Vector3 end, float seconds)
 {
     float elapsedTime = 0;
     Vector3 startingPos = objectToMove.transform.position;
     while (elapsedTime < seconds)
     {
         objectToMove.transform.position = Vector3.Lerp(startingPos, end, (elapsedTime / seconds));
         elapsedTime += Time.deltaTime;
         yield return new WaitForEndOfFrame();
     }
     objectToMove.transform.position = end;
 }

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naghekyan · Jul 26, 2017 at 05:10 PM 0

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This code is wrong. Should be objectToMove. transform. position.

Lakeffect · Jul 26, 2017 at 10:16 PM 0

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Where? All instances of objectToMove are followed by .transform.position in the code above -- I think...

naghekyan · Jul 27, 2017 at 04:29 AM 0

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transform.position = end; -> objectToMove.transform.position = end;

transform.position = Vector3.Lerp(startingPos, end, (elapsedTime / seconds)); -> objectToMove.transform.position = Vector3.Lerp(startingPos, end, (elapsedTime / seconds));

Lakeffect naghekyan · Sep 28, 2017 at 03:56 AM 0

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Thanks! You're absolutely right! Sorry about the confusion.

Move Transform to Target in X seconds

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