Basic Lerp question

Question

Hi everyone, I'm extremely new with Unity and scripting.

I have an object that when it apear I need it to go from world origin to the specific Vector3 (0,0,8)

But I can't seem to find the mistake I'm doing. This is the script that I wrote for the object. Is pretty simple:

{ public float speed;

 void start ()
 {
     transform.position = Vector3.Lerp(transform.position, new Vector3 (0,0,8), Time.deltaTime * speed);
 }

}

I also tried with a void awake and nothing...

Help! Anyone?

Answer 1

Best Answer

Answer by Curb · Mar 27, 2014 at 04:07 PM

The Start function will only execute on one frame. A lerp is usually used to animate an object over multiple frames. One way of doing this would be to make a coroutine:

 IEnumerator MoveObject(float duration){
     float t = 0;
     
     Vector3 currentPos = transform.position;
     Vector3 newPos = new Vector3(0,0,8);
 
     while (t < 1){
         t += Time.deltaTime / duration;
         transform.position = Vector3.Lerp (currentPos, newPos, t);
 
         yield return null;
     }    
 }

Then call it from somewhere with:

 StartCoroutine(MoveObject(3));

The 3 is the duration of the animation. You could build in even more parameters between the () of course.. such as the new position. But this should get you going. :)

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Merrick · Mar 27, 2014 at 06:39 PM 0

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This worked great!! It's exactly what I wanted. Can I ask you why the rutin is a IEnumerator? I thought that was for geting aligned a series of numbers.

Merrick · Mar 27, 2014 at 06:49 PM 0

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TY all for your answers

Destran · Mar 27, 2014 at 06:51 PM 0

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it's an IEnumerator because it's a Coroutine. Any function with a yield statement is a coroutine. Don't forget to mark Curb's answer as correct :D

http://docs.unity3d.com/Documentation/$$anonymous$$anual/Coroutines.html

Basic Lerp question

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