how to assign a texture to a Meshrenderer unity
// Initialize a 2D texture of sizeX by sizeY Texture2D texture = new Texture2D(sizeX, sizeY); // Set the colors to it (an array of colors), // but you can also use texture.SetPixel(x, y, color) to set // the pixel at (x, y) coordinates to the color 'color' texture.SetPixels(colors); // DON'T FORGET TO APPLY THE TEXTURE (VERY IMPORTANT) texture.Apply(); // Set it to your MeshRender meshRenderer.sharedMaterial.mainTexture = texture;