unity自带的导航构建一个简单的地图寻路

1，利用navigation内置的运动控制

2，自己控制运动

3，运行时构建导航网格

重要组件

NavMesh Agent（导航网格代理 挂载在怪物上）

off-Mesh Link （网格链接）

NavMesh Obstacle(障碍，不经常移动勾选Carve)

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AI;

public class controlPlayer : MonoBehaviour {
    private NavMeshAgent nav;

    public float rotateSmoothing = 7;       //转向速度
    public float speed = 5;

	// Use this for initialization
	void Start () {
        nav = this.GetComponent<NavMeshAgent>();
        nav.updatePosition = false;                 //禁用导航控制的运动和转向
        nav.updateRotation = false;
	}
	
	// Update is called once per frame
	void Update () {



        if (Input.GetMouseButton(0))
        {
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            RaycastHit hit;
            bool isOn= Physics.Raycast(ray,out hit);
            if (isOn)
            {
                nav.SetDestination(hit.point);
                //nav.destination = hit.point;          //通过导航控制器控制

                nav.nextPosition = transform.position;


            }
        }
        if (nav.remainingDistance < 0.5f) return;
        nav.nextPosition = this.transform.position;     //把当前位置的设置给导航器的位置（灵魂）
        this.transform.position=nav.nextPosition;       //在把导航器的位置设置为当前的位置

        this.transform.rotation = Quaternion.Lerp(transform.rotation, Quaternion.LookRotation(nav.desiredVelocity), rotateSmoothing * Time.deltaTime);
        //nav.desiredVelocity 是最短路径的目标方向
        this.transform.Translate(Vector3.forward * speed * Time.deltaTime);
    }
}

利用NavMeshComponents进行实时Bake(NavMeshSurface挂载在地形上)

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AI;
public class PlaceBuilder : MonoBehaviour {

    public GameObject builderPrefab;
    private NavMeshSurface surface;
	// Use this for initialization
	void Start () {
        surface = GetComponent<NavMeshSurface>();
    }
	
	// Update is called once per frame
	void Update () {

        if (Input.GetMouseButtonDown(1))
        {
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            RaycastHit hit;
            if(Physics.Raycast(ray, out hit))
            {
                GameObject go = GameObject.Instantiate(builderPrefab, hit.point, Quaternion.identity);
                go.transform.parent = this.transform;
                surface.BuildNavMesh();                //更新寻路
            }
        }
	}
}