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Question by mmaalex22112 · May 05, 2018 at 12:23 AM · c#coroutinelerpmove an objecttranform.position

Help using Lerp inside of a coroutine.

Hello all,

Trying to move a gameobject using lerp. The result I'm getting is that the object moves instantly to the required position rather than over time.

     IEnumerator MoveToSpot()
     {
         Gotoposition = new Vector3(transform.position.x, transform.position.y + 5, transform.position.z);
         float elapsedTime = 0;
         float waitTime = 3f;
         currentPos = transform.position;
 
         while (elapsedTime < waitTime)
         {
             transform.position = Vector3.Lerp(currentPos, Gotoposition, (elapsedTime / waitTime));
             elapsedTime += Time.deltaTime;
         }
         return null;
     }


Would really appreciate the help! <3

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Answer by TreyH · May 05, 2018 at 01:46 AM

You need to yield within that While loop:

 while (elapsedTime < waitTime)
 {
      transform.position = Vector3.Lerp(currentPos, Gotoposition, (elapsedTime / waitTime));
      elapsedTime += Time.deltaTime;
 
      // Yield here
      yield return null;
 }  

 // Make sure we got there
 transform.position = Gotoposition;
 yield return null;


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avatar image mmaalex22112 · May 05, 2018 at 03:45 AM 0
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         while (elapsedTime < waitTime)
         {
             transform.position = Vector3.Lerp(currentPos, Gotoposition, (elapsedTime / waitTime));
             elapsedTime += Time.deltaTime;
             return null;
         }

This gives an error on the function, that not all code paths return a value. What should I return outside of the while?

avatar image TreyH mmaalex22112 · May 05, 2018 at 04:09 AM 0
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whoops, edited

avatar image JedBeryll mmaalex22112 · May 05, 2018 at 05:12 AM 1
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$$anonymous$$ake that a yield return null;

          while (elapsedTime < waitTime)
          {
              transform.position = Vector3.Lerp(currentPos, Gotoposition, (elapsedTime / waitTime));
              elapsedTime += Time.deltaTime;
              yield return null;
          }
avatar image TreyH JedBeryll · May 05, 2018 at 05:27 AM 0
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@JedBeryll ty, typing between games, forgot the most important part

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