放置NPC

我们先在SceneMainCity放上NPC的prefab，然后在NPC的前方放上定位点，这个定位点就是Player导航的时候和NPC对话的站位。

然后在场景中放一个MapRoot对象，在上面挂载MainCityMap脚本，并打上“MapRoot”标签，这个脚本用来记录各个定位点的位置。

NPC放置

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using UnityEngine;

namespace DarknessWarGodLearning
{
    public class MainCityMap : MonoBehaviour
    {
        public Transform[] NpcPosTrans;//在Inspector上指定各个定位点
    }
}

读取MapRoot内的数据

在MainCitySys中获取进入主城的位置信息：

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private Transform[] npcPosTrans;

public void EnterMainCity()
{
    //...
    resSvc.AsyncLoadScene(mapData.sceneName, () =>
    {
        //...

        GameObject map = GameObject.FindGameObjectWithTag("MapRoot");
        MainCityMap mainCityMap = map.GetComponent<MainCityMap>();
        npcPosTrans = mainCityMap.NpcPosTrans;

        //...

    });
}

导航网格的设置

Unity的Navigation完全是依靠标记为static的物体的Mesh Renderer内部的Mesh生成的，在烘焙导航网格时，我们需要先关闭整个场景的物体，然后再打开场景的碰撞盒，并且打开碰撞盒的Mesh，用碰撞盒的Mesh来烘焙导航网格。

烘焙好后，我们给Player的Prefab添加上Nav Mesh Agent组件，并将Angular Speed设为360。关闭掉Nav Mesh Agent组件，我们希望在点击Guide按钮的时候再开启Nav Mesh Agent

在MainCitySys中拿到Nav Mesh Agent组件:

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private NavMeshAgent nav;

private void LoadPlayer(MapCfg mapData)
{
    GameObject player = resSvc.LoadPrefab(PathDefine.AssassinCityPlayerPrefab,true);
//...

    nav = player.GetComponent<NavMeshAgent>();
}

进行任务导航，在MainCitySys里面添加RunTask方法

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private AutoGuideCfg curTaskData;
private bool isNaviguiding = false;

private bool isNaviguiding = false;

public void SetMoveDir(Vector2 dir)//转动摇杆时停止导航
{
    StopNavTask();
    //...
}

public void OpenInfoWnd()//打开角色面板时停止导航
{
    //...
    StopNavTask();
}

public void RunTask(AutoGuideCfg autoGuideCfg)//在MainCityWnd调用
{
    if(autoGuideCfg != null)
    {
        curTaskData = autoGuideCfg;
    }
    //解析任务数据
    nav.enabled = true;//防止Player在和NPC过近时开启导航找不到nav;
    if (curTaskData.npcID != -1)
    {
        float dis = Vector3.Distance(playerController.transform.position, npcPosTrans[autoGuideCfg.npcID].position);
        if(dis < 0.5f)
        {
            isNaviguiding = false;
            nav.isStopped = true;
            playerController.SetAnimTreeBlend(Constants.BlendIdle);
            nav.enabled = false;

            OpenGuideWnd();
        }
        else
        {
            isNaviguiding=true;
            nav.enabled = true;
            nav.speed = Constants.PlayerMoveSpeed;
            nav.SetDestination(npcPosTrans[autoGuideCfg.npcID].position);
            //nav.stoppingDistance = 0.5f;
            playerController.SetAnimTreeBlend(Constants.BlendWalk);
        }
    }
    else
    {
        OpenGuideWnd();
    }
}
private void StopNavTask()
{
    if (isNaviguiding)
    {
        isNaviguiding = false;
        nav.isStopped = true;
        playerController.SetAnimTreeBlend(Constants.BlendIdle);
        nav.enabled = false;
    }
}
private void IsArrivedNavPos()//在Update里面检测距离
{
    float dis = Vector3.Distance(playerController.transform.position, npcPosTrans[curTaskData.npcID].position);
    if (dis < 0.5f)
    {
        isNaviguiding = false;
        nav.isStopped = true;
        playerController.SetAnimTreeBlend(Constants.BlendIdle);
        nav.enabled = false;

        OpenGuideWnd();
    }
}
private void OpenGuideWnd()
{
    //To Do
}
private void Update()
{
    if (isNaviguiding)
    {
        playerController.SetCam();
        IsArrivedNavPos();
    }
}