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Question by swag_swag · Mar 11, 2014 at 05:14 PM · javascriptcolorloopbackgroundvector

{Solved}Trying to add color loop to background using Vector4

This is what I have so far. It currently works on the Game Object I apply the script to. I'm just trying to make it so that the Vector4.Lerp works back and forth without stopping. Please help.

 #pragma strict
 
 private var backgroundColorMagenta : Color = Color.magenta;
 private var backgroundColorGreen : Color = Color.green;
 private var backgroundColorRed : Color = Color.red;
 Color background = new Color(1f,0.83f,0f,1f)
 
 function Start () {
 
 }
 
 function Update () {
 
     renderer.material.color = Color.Lerp(Vector4(0.82,0,1,1), Vector4(1,0.83,0,1), 0.05 * Time.time);
     
     if (this.gameObject.renderer.material.color == background)
     
         {
         
         {renderer.material.color = Color.Lerp(Vector4(1,0.83,0,1), Vector4(0.82,0,1,1), 0.05 * Time.time);
         
         }
 
     }
 
 }
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Answer by whydoidoit · Mar 11, 2014 at 06:05 PM

So you need a function to convert Time.time into a value that rises and falls between 0 and 1.

   function pingPong(t: float) : float {
        t = Mathf.Repeat(t, 2);
        return t < 1 ? t : 2 - t;
   }

then

   renderer.material.color = Color.Lerp(Vector4(1,0.83,0,1), Vector4(0.82,0,1,1), pingPong(0.05 * Time.time))
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avatar image swag_swag · Mar 11, 2014 at 10:51 PM 0
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That's exactly what I was looking for!! The only problem now is the background color doesn't restart a second time. It goes from the Vector4(1,0.83,0,1) to the other one, and back to the Vector4(1,0.83,0,1) but doesn't start again. It simply stays at that color. Any way to loop it infinitely?

avatar image whydoidoit · Mar 12, 2014 at 06:07 AM 0
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Ugh mistype answer updated

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Answer by SirCrazyNugget · Mar 11, 2014 at 11:11 PM

Change the pingPong function to:

C#

 float v = t % 2;
 return v < 1 ? v : 2 - v;

Javascript

 var v : float = t % 2;
 return v < 1 ? v : 2 - v;

whydoidoit's version ensures it's between 0 and 2 but and stores it as v but then never returns v only t. AFAIK Modulo is faster than Mathf.Repeat too even though it's minimal, saving every process you can is always best.

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avatar image swag_swag · Mar 11, 2014 at 11:12 PM 0
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Thanks. I'm not very good at scripting

avatar image swag_swag · Mar 11, 2014 at 11:17 PM 0
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also, after changing it. I got the annoying "Unexpected token: <" error.

avatar image SirCrazyNugget · Mar 11, 2014 at 11:33 PM 0
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Sorry, I posted in C#

 var v : float = t % 2;
 return v < 1 ? v : 2 - v;
avatar image swag_swag · Mar 12, 2014 at 04:53 PM 0
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Thank you, that worked perfectly in Javascript.

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