Unity 实用教程之 Nav导航箭头路线绘制生成
1、打开Unity，新建一个空工程，具体如下图
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
5、ArrowFindPath 脚本的具体代码和代码解释如下图
6、ArrowFindPath 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<GameObject> arrowList = new List<GameObject>();
// 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)) {
print ("hit :" + hit.point);
_navPlayer.SetDestination(hit.point);
NavMesh.CalculatePath(transform.position, hit.point, NavMesh.AllAreas, _navPath);
DrawPath(_navPath);
}
}
}
/// <summary>
/// Draws the path.
/// </summary>
/// <param name="navPath">Nav path.</param>
void DrawPath(NavMeshPath navPath)
{
List<GameObject> 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);
}
}
}
/// <summary>
/// Clears the arrows.
/// </summary>
/// <returns>The arrows.</returns>
/// <param name="arrows">Arrows.</param>
private IEnumerator ClearArrows(List<GameObject> arrows)
{
if (arrowList.Count == 0)
yield break;
foreach (var arrow in arrows)
Destroy(arrow);
}
}
7、在场景中添加一个 Capsule，并在上面添加一个 NavMeshAgent，具体如下图
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