Change pixels on a QUAD texture

Hi,
I'm trying to do a simple thing: take an original texture put on a Quad and then draw new pixels at certain positions.

The problem is that when I do this the texture becomes all grey and the pixels drawn seem to have a strange blurring effect.

The code is the following:

Code (CSharp):

1. MeshRenderer meshRenderer = quad.GetComponent<MeshRenderer>();
2. texture = new Texture2D(meshRenderer.material.mainTexture.width, meshRenderer.material.mainTexture.height);
3. meshRenderer.material.mainTexture = texture;
4.  
5. texture.SetPixel(0, 0, Color.red);
6. texture.SetPixel(1, 0, Color.red);
7. texture.SetPixel(2, 0, Color.red);
8.  
9. texture.Apply();

Look at images:

Original 800x600



After set pixels:




I don't understand the problem! Please help.
Thanks.

 

you need to change the settings on the texture, set it to filtermode point, no compression ettc

 

Yes, this is the problem but I also missed getting the original pixels..

Below the code:

Code (CSharp):

1.  MeshRenderer meshRenderer = quad.GetComponent<MeshRenderer>();
2.  
3.         texture = new Texture2D(meshRenderer.material.mainTexture.width, meshRenderer.material.mainTexture.height, TextureFormat.RGBA32, false);
4.         texture.filterMode = FilterMode.Point;
5.         texture.wrapMode = TextureWrapMode.Clamp;
6.         texture.SetPixels(((Texture2D)meshRenderer.material.mainTexture).GetPixels());
7.         texture.Apply();
8.  
9.         meshRenderer.material.mainTexture = texture;
10.  
11.         for (int y = 0; y < 200; y++)
12.         {
13.             for (int x = 0; x < 800; x++)
14.             {
15.                 texture.SetPixel(x, y, Color.clear);
16.             }
17.         }
18.  
19.         texture.SetPixel(0, 0, Color.red);
20.         texture.SetPixel(1, 0, Color.red);
21.         texture.SetPixel(2, 0, Color.red);
22.  
23.         texture.Apply();

And below the results:




Many thanks for your help!!!