void Awake()
        {
            m_terrainCreator = GameObject.FindObjectOfType <EPMPolyTerrainCreator>();

            m_terrainCreator.Init();
            m_terrainCreator.ImportData();
            GameObject terrianRoot = m_terrainCreator.CreateTerrain();

            for (int i = 0; i < terrianRoot.transform.childCount; i++)
            {
                terrianRoot.transform.GetChild(i).gameObject.AddComponent <MeshCollider>();
            }
        }
        private void DrawDataReadWrite()
        {
            EditorGUILayout.BeginHorizontal();
            GUILayout.Label("Data File:", GUILayout.Width(80));
            TextAsset ta = (TextAsset)EditorGUILayout.ObjectField(m_creator.g_dataFile, typeof(TextAsset), false);

            if (m_creator.g_dataFile != ta)
            {
                m_creator.g_dataFile     = ta;
                m_creator.g_dataFilePath = ta != null?AssetDatabase.GetAssetPath(ta) : "";

                Debug.Log(m_creator.g_dataFilePath);
            }

            EditorGUILayout.EndHorizontal();
            EditorGUILayout.BeginHorizontal();

            if (GUILayout.Button("Create Data"))
            {
                string path = m_creator.CreateData();
                AssetDatabase.SaveAssets();
                AssetDatabase.Refresh();
                m_creator.g_dataFile     = (TextAsset)AssetDatabase.LoadAssetAtPath(path, typeof(TextAsset));
                m_creator.g_dataFilePath = path;
            }
            if (GUILayout.Button("Import Data"))
            {
                if (EditorUtility.DisplayDialog("Caution!", "The imported data will replace current data.", "OK", "Cancel"))
                {
                    if (m_creator.g_dataFile == null)
                    {
                        Debug.LogError("Data File is Null!!!!");
                    }
                    else
                    {
                        m_creator.ImportData();
                    }
                }
            }
            if (GUILayout.Button("Save Data"))
            {
                m_creator.g_dataFilePath = ta != null?AssetDatabase.GetAssetPath(ta) : "";

                m_creator.ExportData();
                AssetDatabase.SaveAssets();
                AssetDatabase.Refresh();
            }
            EditorGUILayout.EndHorizontal();
        }