Draw point with time function

I try to write a script to draw cloud-point. The script must draw a single point every second from an array (or or a time that I decide). I try to use Time (or delta.Time) function (I search inside forum without result) without result. I don’t understand it’work…
This is the script:

var dotMaterial : Material;
var PointsList : Array;
var Points : Array;
var PointsArray : Vector3[];
var dotSize = 1.0;
var dotsnumber = 1;
var dotstime = 1;

private var oldPosition : Vector3;
private var oldRotation : Quaternion;
private var cam : Transform;
private var dots : VectorPoints;

PointsList = [];

function Start() {
	cam = Camera.main.transform;
	oldPosition = cam.position;
	oldRotation = cam.rotation;

	Points = new Array();
	for (i = 0; i < PointsList.length / 3; i++){ 
	Points.Add(Vector3(-PointsList[i*3],PointsList[i*3+2],-PointsList[i*3+1]));
	}
	
	PointsArray = Points.ToBuiltin(Vector3);
	dots = new VectorPoints("Dots", PointsArray, null, dotMaterial, dotSize);
	dots.maxDrawIndex = dotsnumber; //this value say how many point of array drawing
	Vector.DrawPoints(dots);
}

function Update()  { // every second script must be draw one more point
dotstime = Time.deltaTime*1;
    dotsnumber = dotsnumber + dotstime;
}
  
function LateUpdate () {
	if (cam.position != oldPosition || cam.rotation != oldRotation) {
		oldPosition = cam.position;
		oldRotation = cam.rotation;
		dots.maxDrawIndex = dotsnumber;
		Vector.DrawPoints(dots);
	}
 }

“dotstime” is an int, so assigning Time.deltaTime to it will always result in 0. You’re better off just using InvokeRepeating anyway.

function Start () {
    InvokeRepeating ("IncreaseDotsnumber", 1.0, 1.0);
}

function IncreaseDotsnumber () {
    dotsnumber++;
}