unity A*寻路（一）导出NavMesh数据

使用unity的API NavMesh.CalculateTriangulation 可以获取NavMesh数据

首先我们创建一个新的工程保存一个test场景

然后在场景中添加一个Plane作为地面可以寻路，添加几个cube作为障碍物，添加一个灯光如图

点击左上角Window->Navigation 打开Navigation窗口

选中plane对象设置参数如图

同样的操作选中cube设置参数不过Navigation Area参数为Not Walkable

最后点击右下角Back按钮

烘焙成功在Naviagtion窗口激活状态下 Scene视图如下

寻路准备工作已经完成

现在我们需要获取到NavMesh数据

在工程中添加代码

代码如下：

using System.IO;
using UnityEditor;
using UnityEngine.SceneManagement;
using UnityEngine;


//navmesh导出数据
public class NavMeshExport : MonoBehaviour
{
    [MenuItem("NavMesh/Export")]
    static void Export()
    {
        Debug.Log("NavMesh Export Start");

        NavMeshTriangulation navMeshTriangulation = NavMesh.CalculateTriangulation();

        //文件路径 路径文件夹不存在会报错 
        string path = Application.dataPath + "/AStar/obj/" + SceneManager.GetActiveScene().name + ".obj";

        //新建文件
        StreamWriter streamWriter = new StreamWriter(path);

        //顶点  
        for (int i = 0; i < navMeshTriangulation.vertices.Length; i++)
        {
            streamWriter.WriteLine("v  " + navMeshTriangulation.vertices[i].x + " " + navMeshTriangulation.vertices[i].y + " " + navMeshTriangulation.vertices[i].z);
        }

        streamWriter.WriteLine("g pPlane1");

        //索引  
        for (int i = 0; i < navMeshTriangulation.indices.Length;)
        {
            streamWriter.WriteLine("f " + (navMeshTriangulation.indices[i] + 1) + " " + (navMeshTriangulation.indices[i + 1] + 1) + " " + (navMeshTriangulation.indices[i + 2] + 1));
            i = i + 3;
        }

        streamWriter.Flush();
        streamWriter.Close();

        
        AssetDatabase.Refresh();

        Debug.Log("NavMesh Export Success");
    }
}

点击NavMesh-> Export 按钮导出NavMesh数据保存在obj文件夹

注意：

1.如果obj文件夹不存在会报错

2.obj文件导入unity时会自动生成一个Materials文件里面有一个材质球可以自己删除

链接: https://pan.baidu.com/s/1u4m4HYTGuoLwTg7U66a_Cg 密码: u81j

unity A*寻路 （一）导出NavMesh数据

unity A*寻路（一）导出NavMesh数据