2-12 Player Pathfinding To Enemies

本章要介紹製作Player走到Enemy面前的方法，大家可以參考2-9 Make Enemies Pathfind To Player 

https://rpgcorecombat.blogspot.tw/2017/12/2-9-make-enemies-pathfind-to-player.html

基本上，原理是一樣的，所以就不多做額外的說明啦！首先，當然要將Player新增Nav Mesh Agent跟AI Character Control兩個組件。

再來修改PlayerMovement.cs，其原理大致上是建立一個Empty GameObject名為WalkTarget，然後將WalkTarget設置到偵測滑鼠點擊的位置，並由Nav Mesh Agent自動導航到此處。相比過去舊的寫法，這方式可以自動尋徑繞過建築物。

接著程式碼上菜！註解自己看吧！

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using System; using UnityEngine; using UnityEngine.AI; using UnityStandardAssets.Characters.ThirdPerson;   [RequireComponent(typeof (NavMeshAgent))] [RequireComponent(typeof (AICharacterControl))] [RequireComponent(typeof (ThirdPersonCharacter))] public class PlayerMovement : MonoBehaviour {  [SerializeField] float walkMoveStopRadius = 0.2f;  [SerializeField] float attackMoveStopRadius = 5f;       ThirdPersonCharacter theThirdPersonCharacter = null;     CameraRaycaster cameraRaycaster = null;     Vector3 clickPoint;     AICharacterControl aiCharacterControl = null;     GameObject walkTarget = null;       private void Start()     {         cameraRaycaster = Camera.main.GetComponent<cameraraycaster>();         theThirdPersonCharacter = GetComponent<thirdpersoncharacter>();         aiCharacterControl = GetComponent<aicharactercontrol> ();         // 自動在場景中新增GameObject         walkTarget = new GameObject ("WalkTarget");           cameraRaycaster.notifyMouseClickObservers += ProcessMouseMovement;     }       private void ProcessMouseMovement(RaycastHit raycastHit, int layerHit){         const int walkable = 8, enemy = 9;         switch (layerHit) {         case walkable:          // 取得滑鼠點擊到的位置，並把WalkTarget設置在那裡          walkTarget.transform.position = raycastHit.point;          // 追蹤WalkTarget          aiCharacterControl.SetTarget (walkTarget.transform);          GetComponent<navmeshagent> ().stoppingDistance = walkMoveStopRadius;          break;         case enemy:          // 取得滑鼠點擊到的GameObject          GameObject enemyObejct = raycastHit.collider.gameObject;          // 追蹤Enemy          aiCharacterControl.SetTarget (enemyObejct.transform);          GetComponent<navmeshagent> ().stoppingDistance = attackMoveStopRadius;          break;         default:          print ("Unexpected layer found.");          break;         }       }       void OnDrawGizmos(){         //繪製移動路徑         Gizmos.color = Color.black;         Gizmos.DrawLine (transform.position, clickPoint);         Gizmos.DrawSphere (clickPoint, 0.1f);           //繪製攻擊範圍         Gizmos.color = new Color(255f, 0f, 0f, 0.5f);         Gizmos.DrawWireSphere (transform.position, attackMoveStopRadius);     } }     </navmeshagent></navmeshagent></aicharactercontrol></thirdpersoncharacter></cameraraycaster>