How can I change all of a textures pixels to one color?

Question

I have a painting app in which colors are painted over the top of a completely transparent, blank texture. I need to create a "clear" functionality where all the pixels in the texture are reset to a specific color (1, 1, 1, 0); which is a completely transparent white. Rather than changing out the texture each time, I would rather simply wipe all the pixels on the one texture. Here is what I've got so far but it's not working:

 #pragma strict
 
 var resetColor : Color = Color(1, 1, 1, 0);
 var tex : Texture2D;
 var resetColorArray = new Array ();
 
 function Start () {
 
     tex = renderer.material.GetTexture ("_MainTex");
     resetColorArray =  tex.GetPixels();
 
 }
 
 function Update () {
     
     if (Input.GetKeyDown(KeyCode.Return)) {
         for(var i = 0; i < resetColorArray.length; ++i)
         {
             resetColorArray[i] = resetColor;
         }
          
         tex.SetPixels( resetColorArray );
          
         tex.Apply();
     }    
 }

How can I do this?

Answer 1

Best Answer

Answer by Eric5h5 · Feb 09, 2014 at 11:25 AM

The resetTextureArray needs to be either a Color array, or preferably a Color32 array, which you can use with SetPixels32. Never use the Array class (for this or anything else; it's useless). Also resetTextureArray should ideally be filled once in Start, rather than every time you hit return.

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Hamesh81 · Feb 09, 2014 at 11:49 AM 0

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Ah awesome thanks for that, that solved the problem! Cheers

greenpower · Mar 22, 2016 at 02:33 PM 0

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This also worked for me. Thanks!

By the way, in C# it looks like this:

     // New texture
     texture_ = new Texture2D(x, y);

     // Reset all pixels color to transparent
     Color32 resetColor = new Color32(255, 255, 255, 0);
     Color32[] resetColorArray = texture_.GetPixels32();

     for (int i = 0; i < resetColorArray.Length; i++) {
         resetColorArray[i] = resetColor;
     }
      
     texture_.SetPixels32(resetColorArray);
     texture_.Apply();

Cheers

How can I change all of a textures pixels to one color?

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