Unity terrain reading tool

using UnityEngine;
using System.Collections;
using System.Text;
using UnityEditor;

// 将NavMesh转化为bitmap平面地图的类
public class MapReader : MonoBehaviour
{
    #region Public Attributes  
    public Vector3 leftUpStart = Vector3.zero;
    public float accuracy = 1;
    public int height = 30;
    public int wide = 30;
    #endregion

    #region Unity Messages  

    void OnGUI()
    {
        if (GUILayout.Button("Export"))
        {
            exportPoint(leftUpStart, height, wide, accuracy);
        }
    }

    #endregion

    #region Public Methods  

    public void Exp()
    {
        exportPoint(leftUpStart, wide, height, accuracy);
    }

    public void exportPoint(Vector3 startPos, int x, int y, float accuracy)
    {
        StringBuilder str = new StringBuilder();
        char[,] list = new char[x, y];
        for (int i = 0; i < x; i++)
        {
            for (int j = 0; j < y; j++)
            {
                list[i, j] = '#';
            }
        }
        str.Append("startpos=").Append(startPos).Append("\r\n");
        str.Append("height=").Append(y).Append("\r\nwide=").Append(x).Append("\r\naccuracy=").Append(accuracy).Append("\r\n");
        for (int i = 0; i < y; ++i)  // row, 即y值
        {
            str.Append("{");
            for (int j = 0; j < x; ++j)  // col, x value
            {
                char res = list[j, i];
                UnityEngine.AI.NavMeshHit hit;
                for (int k = -10; k < 30; ++k)
                {   // startPos = (-30, 0, 30). x:(-30 ~ 30), y(30, -30)
                    if (UnityEngine.AI.NavMesh.SamplePosition(startPos + new Vector3(j * accuracy, k, -i * accuracy), out hit, 0.2f, UnityEngine.AI.NavMesh.AllAreas))
                    {
                        res = '.';
                        break;
                    }
                }
                Debug.DrawRay(startPos + new Vector3(j * accuracy, 0, -i * accuracy), Vector3.up, res == '.' ? Color.green : Color.red, 100f);
                str.Append(res).Append(",");
            }
            str.Append("},\n");
        }
        Debug.Log(str.ToString());
        System.IO.File.WriteAllText("layout.txt", str.ToString(), Encoding.UTF8);
        Debug.Log("file written!");
    }
    #endregion

}

[CustomEditor(typeof(MapReader))]
public class NavExportHelper : Editor
{
    public override void OnInspectorGUI()
    {
        base.OnInspectorGUI();
        if (GUILayout.Button("Export"))
        {
            var exp = target as MapReader;
            exp.Exp();
        }
    }
}

Be careful to bake the navmesh before using it! ! !