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Question by nicedude80 · Feb 15, 2014 at 08:40 PM · 2djavascriptlerpvector2

Using Lerp with 2d only moving partially

I am trying to make a very basic waypoint system. So I decided to use Lerp for changing between positions. The problem is that when I do this the object that should be moving doesn't "Lerp" to the place it is supposed to. So I should probably ask, using lerp, can it be called once within the update frame? Here's the code:

 #pragma strict
 var smooth : float = 3.0;
 
 var waypointPos1 : Transform;
 
 var waypointPos2 : Transform;
 
 var hasFinished = false;
 
 var currentPosition : Vector2;
 
 function Start () {
 
 currentPosition = transform.position;
 
 }
 
 function Update () {
 
 if(hasFinished == false){
 
 transform.position = Vector2.Lerp(currentPosition, waypointPos1.position, smooth * Time.deltaTime);
 
 hasFinished = true;
 
 }
 
 }
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avatar image nicedude80 · Feb 15, 2014 at 08:55 PM 0
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I didn't figure out what the problem is, I am guessing it is because it only has the chance to move over 1 frame then it stops, but I am now using Vector2.moveTowards();

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Answer by robertbu · Feb 15, 2014 at 09:00 PM

With MoveTowards() you can change line 24 to:

 if (currentPosition == waypointPos1.position) hasFinished = true;

For Lerp() used this way, you need something a bit different because it can take a very long time to reach the goal after it is close to the goal. For Lerp() replace line 24 with:

 if (Vector3.Distance(currentPosition, waypointPos1.position) < threshold) {
     transform.position = waypointPos1.position;
     hasFinished = true;
 }

'threshold' is some smaller value like 0.1 that looks right for your particular setup.

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