UnityEditor.HeightmapFilters.WobbleStuff C# (CSharp) Method

        private static void WobbleStuff(float[,] heights, TerrainData terrain)
        {
            for (int i = 0; i < heights.GetLength(0); i++)
            {
                for (int j = 0; j < heights.GetLength(1); j++)
                {
                    heights[i, j] = (heights[i, j] + 1f) / 2f;
                }
            }
        }
    }