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Question by Zynpo · Jan 07, 2016 at 11:34 PM · setpixel

SetPixel on Texture2D help needed

Hello.

I have an image that is a cupcake that I am trying to take a "bite" out of.

To accomplish this I simply call SetPixel() on the cupcake texture to Color.Clear to fill the bite to alpha transparency.

This works fine EXCEPT it leaves an outline border around the area I am clearing out. (see attached image).

Does anyone know what's causing this outline/border to show up?

Here is my code:

 public void OnPointerDown()
 {
     Vector3 mousePosition = Input.mousePosition;
     Color col = new Color (0,0,0,0);
 
     int startX = (int)mousePosition.x - 50;
     int startY = (int)mousePosition.y - 50;

     // This is the pattern I want to follow to make the bite mark.
     Texture2D texture = Resources.Load("Bite") as Texture2D;
 
     for (int y = 0; y < texture.height; y++) 
     {
         for (int x = 0; x < texture.width; x++) 
         {
             if (texture.GetPixel (x, y).a == 1) 
             {
                 _cupcakeEatingTexture.SetPixel (startX + x, startY + y, Color.clear);
             }
         }
     }
 
     _cupcakeEatingTexture.Apply ();    
 }
 

alt text

cupcake.png (135.5 kB)
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Answer by Eric5h5 · Jan 07, 2016 at 11:46 PM

Presumably the result of anti-aliasing in the image. Either don't use that, or allow for alpha that's less than 1, rather than using ".a == 1".

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