curiosity with Mathf.PingPong

Unity Engine
1

I created an object that has to go back and forth tamite Mathf.PingPong. I noticed that if I create instances of this object at a distance of a certain period of time, the function is already in action PingPong beginning. How come? I can solve this problem?

PingPong

 function Start(){
 
 
 
 }
  
    function Update () {
        // Set the x position to loop between 0 and 3
        transform.position = Vector3(
                     Mathf.PingPong(Time.time, 30 ), transform.position.y, transform.position.z);
    }

Instantiate

var speed : int = 2;
var chrismasBall : GameObject; //GameObject
var instanza:GameObject[]; //instanza
//var texBall : Texture[] = new Texture [5]; //Array di texture

var score : int = 0;



function Start () {

yield WaitForSeconds(5);
StartCoroutine(Creation(10)); //Coroutine





}



function Update () {
//Physics.gravity = Vector3(0, -0.05, 0); // aggiungo gravità

/*if(instanza==null){

print("cancello");
}
*/

}







function Creation(tempo){

while(true){ //finchè è vero esegui il ciclo
   
   	var posizione : Vector3 = Vector3 (Random.Range(-1.9,1.9),15,10.0);
      var pallaNuova : int =  Random.Range(0,instanza.length);
      Instantiate (instanza[pallaNuova], transform.position+posizione, transform.rotation); //instanza chrismasBall
      
      
     
     
      
     //instanza.AddComponent(Rigidbody); //aggiungo rigidbody alle instanze
     
      /*
      instanza.transform.position.x = Random.Range(2,-2); //raggio di instanza
      instanza.transform.position.y = 2; 
      instanza.transform.position.z = 0.2; //distanza dalla Main Camera
      instanza.transform.Translate(0, Time.deltaTime, 0); 
      */
      yield WaitForSeconds(tempo);
   
   
 
  

}





}
2

I hope I’ve understood the question. You can fix this by recording the time your object started and subtracting this from the current time:

var startTime : float;

function Start()
{
  startTime = Time.time;
}

function Update()
{
  transform.position = Vector3(Mathf.PingPong(Time.time - startTime, 30), transform.position.y, transform.position.z);
}