gistfile1.cs

        private bool CheckThreshold(Vector4[] colors)
        {
            int i;
            Vector4 a = new Vector4();
            Vector4 min = new Vector4();
            Vector4 max = new Vector4();

            for (i = 0; i < colors.Length; i++)
            {
                Vector4 c = colors[i];


                Vector4.Min(ref min, ref c, out min);
                Vector4.Max(ref max, ref c, out max);

                a += colors[i];
                i++;
            }

            a /= i;

            return (a - _nodeThreshold) >= min && (a + _nodeThreshold) <= max;
        }