在unity中使用navigation系统实现简易寻路路径的绘制

1.场景搭建

演示场景如下:

2.移动主角位置

1. 给主角添加导航代理组件

2. 烘焙场景导航网格

3. 添加寻路脚本

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

public class Findpath : MonoBehaviour {

    private NavMeshAgent _navPlayer;
    private Vector3 nextDes = Vector3.zero;
	// Use this for initialization
	void Start () {
        _navPlayer = transform.GetComponent<NavMeshAgent>();
	}
	
	// Update is called once per frame
	void Update () {
		if(Input.GetMouseButtonDown(0)) {
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            RaycastHit hit;
            if(Physics.Raycast(ray,out hit,Mathf.Infinity)) {
                
                _navPlayer.SetDestination(hit.point);
                
            }
        }
	}
}

至此已经实现了主角移动至点击位置的功能

3.绘制路径

1. 使用NavMeshAgent.CalculatePath()函数得到寻路路径点

   NavMeshAgent.CalculatePath()函数：

   public bool CalculatePath(Vector3 targetPosition, AI.NavMeshPath path);

   参数targetPosition为目标点 ，path为返回需要的路径
   详细解释可参考官方API

2. 创建空物体添加LineRenderer组件

   在层次面板中创建一个空物体然后添加LineRenderer组件

3. 将得到的路径数组赋给LineRenderer实现路径绘制

   修改上面的脚本为：

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

public class Findpath : MonoBehaviour {

    private NavMeshAgent _navPlayer;
    private NavMeshPath _navPath;
    public LineRenderer lineGameObject;
	// Use this for initialization
	void Start () {
        _navPlayer = transform.GetComponent<NavMeshAgent>();
        _navPath = new NavMeshPath();
	}
	
	// Update is called once per frame
	void Update () {
		if(Input.GetMouseButtonDown(0)) {
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            RaycastHit hit;
            if(Physics.Raycast(ray,out hit,Mathf.Infinity)) {
                
                _navPlayer.SetDestination(hit.point);
                _navPlayer.CalculatePath(hit.point, _navPath);
                if (_navPath.corners.Length < 2)
                    return;
                else {
                    lineGameObject.numPositions = _navPath.corners.Length;
                    lineGameObject.SetPositions(_navPath.corners);
                }
            }
        }
    }
}

4.实现效果展示