Unity 实用教程之 Nav导航箭头路线绘制。本节介绍，在Unity开发中，导航的时候实现导航箭头的绘制生成的方法（类似案例可参考如下经验链接），具体如下17Unity 实用教程之 简单地图导航循环长箭头实现
工具/原料
方法/步骤
2在场景中，简单的布置一些环境物体，并设置为 Static，具体如下图
3在顶部菜单栏 Window - Navgation， Bake 环境，具体如下图
4在工程中，新建一个脚本 ArrowFindPath，右键 Open C# Project 打开脚本，进行编辑，具体如下图
5ArrowFindPath 脚本的具体代码和代码解释如下图
6ArrowFindPath 脚本具体内容如下：using System.Collections;using System.Collections.Generic;using UnityEngine;using UnityEngine.AI;public class ArrowFindPath : MonoBehaviour { private NavMeshAgent _navPlayer; private NavMeshPath _navPath; public float tileSpacing = 0.5f; public LineRenderer lineGameObject; public GameObject directionPrefab; private List arrowList = new List(); // Use this for initialization void Start () { _navPlayer = transform.GetComponent(); _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)) { print ('hit :' + hit.point); _navPlayer.SetDestination(hit.point); NavMesh.CalculatePath(transform.position, hit.point, NavMesh.AllAreas, _navPath); DrawPath(_navPath); } } } /// /// Draws the path. /// /// Nav path. void DrawPath(NavMeshPath navPath) { List arrows = arrowList; StartCoroutine(ClearArrows(arrows)); arrowList.Clear(); //If the path has 1 or no corners, there is no need to draw the line if (navPath.corners.Length < 2) { print ('navPath.corners.Length < 2'); return; } // Set the array of positions to the amount of corners... lineGameObject.positionCount = navPath.corners.Length; Quaternion planerot = Quaternion.identity; for (int i = 0; i < navPath.corners.Length; i++) { // Go through each corner and set that to the line renderer's position... lineGameObject.SetPosition(i, navPath.corners[i]); float distance = 0; Vector3 offsetVector = Vector3.zero; if (i < navPath.corners.Length - 1) { //plane rotation calculation offsetVector = navPath.corners[i + 1] - navPath.corners[i]; planerot = Quaternion.LookRotation(offsetVector); distance = Vector3.Distance(navPath.corners[i + 1], navPath.corners[i]); if (distance < tileSpacing) continue; planerot = Quaternion.Euler(90, planerot.eulerAngles.y, planerot.eulerAngles.z); //plane position calculation float newSpacing = 0; for (int j = 0; j < distance / tileSpacing; j++) { newSpacing += tileSpacing; var normalizedVector = offsetVector.normalized; var position = navPath.corners[i] + newSpacing * normalizedVector; GameObject go = Instantiate(directionPrefab, position+Vector3.up, planerot); arrowList.Add(go); } } else { GameObject go = Instantiate(directionPrefab, navPath.corners[i]+Vector3.up, planerot); arrowList.Add(go); } } } /// /// Clears the arrows. /// /// The arrows. /// Arrows. private IEnumerator ClearArrows(List arrows) { if (arrowList.Count == 0) yield break; foreach (var arrow in arrows) Destroy(arrow); }}
8在场景中，新建一个 GameObject，命名为 LineRenderer，并在上面添加一个LineRenderer组件，具体如下图
9导入一个箭头的 图片，并修改成精灵图，拖到场景中，调整好合适的精灵图比例，在拖到工程中，作为预制体，具体如下图
10选中场景中的 Capsule，添加脚本 ArrowFindPath，赋值 LineRenderer 和 箭头预制体，具体如下图
11运行场景，在场景中随便点击们就会生成，箭头路线，具体如下图
12到此，《Unity 实用教程之 Nav导航箭头路线绘制生成》讲解结束，谢谢
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