gistfile1.txt

if (smoothRadius > 0)
            {
                for (int i = 0; i < smoothRepeat; i++)
                {
                    for (int x = 0; x < hmWidth; x++)
                        for (int z = 0; z < hmHeight; z++)
                        {
                            Ray ray = new Ray(new Vector3(x + terrain.transform.position.x, 1000, z + terrain.transform.position.z), Vector3.down);
                            RaycastHit[] hit = Physics.RaycastAll(ray);

                            bool cont = true;
                            RaycastHit h = new RaycastHit();
                            foreach (RaycastHit hi in hit)
                            {
                                if (hi.collider.gameObject == parent.gameObject)
                                    cont = false;
                                if (hi.collider.gameObject == terrain.gameObject)
                                    h = hi;
                            }
                            if (cont)
                            {
                                Vector3 hitPoint = (h.point - terrain.transform.position);
                                int hitX = (int)(((h.point.x - terrain.transform.position.x) / terrain.terrainData.size.x) * hmWidth);
                                int hitZ = (int)(((h.point.z - terrain.transform.position.z) / terrain.terrainData.size.z) * hmHeight);

                                float avg = 0;
                                int count = 0;

                                avg += smooth(heights, hitX, hitZ, avg, 0, ref count);
                                //avg += smooth(heights, hitX - 1, hitZ, avg, 0, ref count);
                                //avg += smooth(heights, hitX, hitZ + 1, avg, 0, ref count);
                                //avg += smooth(heights, hitX, hitZ - 1, avg, 0, ref count);

                                heights[hitX, hitZ] = avg / count;
                            }
                        }
                

                
                }
            }

gistfile2.txt

float smooth(float[,] heights, int x, int y, float avg, int radius, ref int count)
    {
        radius++;
        count++;

        if (radius > smoothRadius)
        {
            return avg;
        }
        
        if(x > 0 && x < heights.GetLength(0))
        {
            if (y > 0 && y < heights.GetLength(1))
            {
                avg += heights[x,y];

                avg += smooth(heights, x + 1, y, avg, radius, ref count);
                avg += smooth(heights, x - 1, y, avg, radius, ref count);
                avg += smooth(heights, x, y + 1, avg, radius, ref count);
                avg += smooth(heights, x, y - 1, avg, radius, ref count);
            }
        }
        
        return avg;
    }