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Hey,

I am looking for a method to move a variable's value to 0, in 1.5 seconds. I have a variable, which holds 250 at the start.

I have tried it this way, but it doesn't work.

function Fade (target : SpriteText)
{
    var startingFade   : int = 250;
    var targetFade     : int = 0;
    var fadeTime    : float = 1.5;

    var rate = 1.0/fadeTime;
    var t : float = 0.0;

    while (t < 1.0) 
    {
        t += Time.deltaTime * rate;
        target.SetColor(Color(255, 177, 0, t));
        yield;
    }
}

Answer 1

0

Use Mathf.Lerp. So like this:

var startingFade : float = 250;
var timeInSeconds : float = 1.5;
var rate : float;

function Update () {
    if (rate < 1) {
       rate += Time.deltaTime / timeInSeconds;
       rate = Mathf.Clamp(rate, 0, timeInSeconds);
       startingFade = Mathf.Lerp(startingFade, 0, rate);
    }
}

Hope that helps, Klep

answered Apr 11 '12 at 01:37 PM

Kleptomaniac
2.5k ● 6 ● 11 ● 21

Actually, I'll also clamp rate to 1.5 so we get it exactly right.

Apr 11 '12 at 01:53 PM Kleptomaniac

(comments are locked)

Answer 2

0

Have a look at this:

http://answers.unity3d.com/questions/35610/variable-that-decreases-after-a-certain-amount-of.html

hope this helps you.

answered Apr 11 '12 at 12:49 PM

ExTheSea
2k ● 12 ● 23 ● 30

(comments are locked)

Answer 3

Looking at your code, it seems that you want to go from one color to another (maybe the colors just differ by alpha value) over a period of time. There is exactly a function for that. It is called:

Color.Lerp

I'm going to ask you to study that in the Unity Scripting Reference documentation. But, from a high level, what I think you want is:

function Fade()
{
   var fadeTime:float = 1.5;
   var targetTime:float = Time.time + fadeTime;
   var diff:float = targetTime - Time.time;
   while (diff >= 0)
   {
       target.SetColor(Color.lerp(endColor, startColor, diff/fadeTime));
       yield;
       diff = targetTime - Time.time;
   }
}

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Move value to 0 in 1.5 seconds

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