Синтез облаков

    const int PSize = 512; // здесь ставим свой размер
    float[,] Noise = new float[PSize, PSize];
 
    private void Gen()
    {
      Random Rnd = new Random();
      int d = PSize >> 1;
      while (true)
      {
        for (int y = 0; y < PSize; y += d + d)
        {
          for (int x = 0; x < PSize; x += d + d)
          {
            Noise[(x + d) & (PSize - 1), y] = (Noise[x, y] + Noise[(x + d + d) & (PSize - 1), y]) * 0.5f + (float)d * (0.001f * (float)Rnd.Next(1000) - 0.5f);
            Noise[x, (y + d) & (PSize - 1)] = (Noise[x, y] + Noise[x, (y + d + d) & (PSize - 1)]) * 0.5f + (float)d * (0.001f * (float)Rnd.Next(1000) - 0.5f);
            Noise[(x + d) & (PSize - 1), (y + d) & (PSize - 1)] = (Noise[x, y] + Noise[(x + d + d) & (PSize - 1), (y + d + d) & (PSize - 1)] + Noise[x, (y + d + d) & (PSize - 1)] + Noise[(x + d + d) & (PSize - 1), y]) * 0.25f + (float)d * (0.001f * (float)Rnd.Next(1000) - 0.5f);
          }
        }
        if (d == 1) break;
        d = d >> 1;
      }
    }