public class TargetMovementScript : MonoBehaviour { public float targetSpeed=9.0f;//Speed At Which the Object Should Move void Update () transform.Translate (Input.GetAxis ('Horizontal')*Time.deltaTime*targetSpeed,Input.GetAxis ('Vertical')*Time.deltaTime*targetSpeed,0); } }

public class EnemyAimScript : MonoBehaviour { public Transform target; // Target Object public float enemyAimSpeed=5.0f; // Speed at Which Enenmy locks on the Target Quaternion newRotation; float orientTransform; float orientTarget; void Update () { orientTransform = transform.position.x; orientTarget = target.position.x; // To Check on which side is the target , i.e. Right or Left of this Object if (orientTransform > orientTarget) { // Will Give Rotation angle , so that Arrow Points towards that target newRotation = Quaternion.LookRotation (transform.position - target.position, -Vector3.up); } else { newRotation = Quaternion.LookRotation (transform.position - target.position,Vector3.up); } // Here we have to freeze rotation along X and Y Axis, for proper movement of the arrow newRotation.x = 0.0f; newRotation.y = 0.0f; // Finally rotate and aim towards the target direction using Code below transform.rotation = Quaternion.Lerp (transform.rotation,newRotation,Time.deltaTime * enemyAimSpeed); // Another Alternative // transform.rotation = Quaternion.RotateTowards(transform.rotation,newRotation, Time.deltaTime * enemyAimSpeed); } }

          創(chuàng)建空的游戲?qū)ο蟛⑵渥鳛橛巫狱cWanderer Points。放置這些空的游戲?qū)ο笙?，為您選擇平面周圍。在這里藍(lán)色的Cube是 AI Cube和紅一個是玩家控制的Cube。將它們放在距離不夠遠(yuǎn)。

public class BoxMovementScript : MonoBehaviour { public float speed = 0.1f; private Vector3 positionVector3; void Update () { InitializePosition (); if (Input.GetKey (KeyCode.LeftArrow)) { GoLeft (); } if (Input.GetKey (KeyCode.RightArrow)) { GoRight (); } if (Input.GetKey (KeyCode.UpArrow)) { GoTop (); } if (Input.GetKey (KeyCode.DownArrow)) { GoDown (); } RotateNow (); } private void InitializePosition () { positionVector3 = transform.position; } private void RotateNow () { Quaternion targetRotation = Quaternion.LookRotation (transform.position - positionVector3); transform.rotation = targetRotation; } private void GoLeft () { transform.position = transform.position new Vector3 (-speed, 0, 0); } private void GoRight () { transform.position = transform.position new Vector3 (speed, 0, 0); } private void GoTop () { transform.position = transform.position new Vector3 (0, 0, speed); } private void GoDown () { transform.position = transform.position new Vector3 (0, 0, -speed); } }

public class FSM : MonoBehaviour { //Player Transform protected Transform playerTransform; //Next destination position of the Box protected Vector3 destPos; //List of points for patrolling protected GameObject[] pointList; protected virtual void Initialize (){ } protected virtual void FSMUpdate (){ } protected virtual void FSMFixedUpdate (){ } void Start () { Initialize (); } void Update () { FSMUpdate (); } void FixedUpdate () { FSMFixedUpdate (); } }

public class BoxFSM : FSM { public enum FSMState { None, Patrol, Chase, } //Current state that the Box is in public FSMState curState; //Speed of the Box private float curSpeed; //Box Rotation Speed private float curRotSpeed; //Initialize the Finite state machine for the AI Driven Box protected override void Initialize () { curState = FSMState.Patrol; curSpeed = 5.0f; curRotSpeed = 1.5f; //Get the list of points pointList = GameObject.FindGameObjectsWithTag ('WandarPoint'); //Set Random destination point for the patrol state first FindNextPoint (); //Get the target enemy(Player) GameObject objPlayer = GameObject.FindGameObjectWithTag ('Player'); playerTransform = objPlayer.transform; if (!playerTransform) print ('Player doesn't exist.. Please add one ' 'with Tag named 'Player''); } //Update each frame protected override void FSMUpdate () { switch (curState) { case FSMState.Patrol: UpdatePatrolState (); break; case FSMState.Chase: UpdateChaseState (); break; } } protected void UpdatePatrolState () { //Find another random patrol point on reaching the current Point //point is reached if (Vector3.Distance (transform.position, destPos) <= 2.5f) { print ('Reached to the destination point\n' 'calculating the next point'); FindNextPoint (); } //Check the distance with player Box //When the distance is near, transition to chase state else if (Vector3.Distance (transform.position, playerTransform.position) <= 15.0f) { print ('Switch to Chase State'); curState = FSMState.Chase; } //Rotate to the target point Quaternion targetRotation = Quaternion.LookRotation (destPos - transform.position); transform.rotation = Quaternion.Slerp (transform.rotation, targetRotation, Time.deltaTime * curRotSpeed); //Go Forward transform.Translate (Vector3.forward * Time.deltaTime * curSpeed); } protected void FindNextPoint () { print ('Finding next point'); int rndIndex = Random.Range (0, pointList.Length); float rndRadius = 5.0f; Vector3 rndPosition = Vector3.zero; destPos = pointList [rndIndex].transform.position rndPosition; //Check Range to Move and decide the random point //as the same as before if (IsInCurrentRange (destPos)) { rndPosition = new Vector3 (Random.Range (-rndRadius, rndRadius), 0.0f, Random.Range (-rndRadius, rndRadius)); destPos = pointList [rndIndex].transform.position rndPosition; } } protected bool IsInCurrentRange (Vector3 pos) { float xPos = Mathf.Abs (pos.x - transform.position.x); float zPos = Mathf.Abs (pos.z - transform.position.z); if (xPos <= 8 && zPos <= 8) return true; return false; } protected void UpdateChaseState () { //Set the target position as the player position destPos = playerTransform.position; //Check the distance with player Box When float dist = Vector3.Distance (transform.position, playerTransform.position); //Go back to patrol as player is now too far if (dist >= 15.0f) { curState = FSMState.Patrol; FindNextPoint (); } //Rotate to the target point Quaternion targetRotation = Quaternion.LookRotation (destPos - transform.position); transform.rotation = Quaternion.Slerp (transform.rotation, targetRotation, Time.deltaTime * curRotSpeed); //Go Forward transform.Translate (Vector3.forward * Time.deltaTime * curSpeed); } }

       此腳本適用于Cube是要跟隨玩家，不要忘記把player標(biāo)記Tag為 Player 和 Tag 為 WandarPoint，現(xiàn)在如 FSMUpdate() 所示的腳本將調(diào)用方法，這在子類中重寫和它將在每個 update () 上執(zhí)行。

         在這里switch case被實施 將用于執(zhí)行的當(dāng)前狀態(tài)的操作。 因此擴(kuò)展 AI 是很簡單的僅僅通過添加新的state。Initialize() 方法也重寫，并將在 start () 方法中調(diào)用執(zhí)行。UpdatePatrolState() 將在每次更新上執(zhí)行，當(dāng)當(dāng)前狀態(tài)是patrol 周圍巡邏，也將會發(fā)生在 UpdateChaseState()，當(dāng)玩家在接近度 AI Box。如果當(dāng)處于巡邏，玩家進(jìn)來的 AI Box中，狀態(tài)將更改為 巡邏，相同 類型的檢查仍在  追逐模式檢查如果球員已遠(yuǎn)離其視野范圍， 然后切換回巡邏狀態(tài)， 在每個更新，檢查狀態(tài)更改。

結(jié)論:

       FSM 的很容易理解和實現(xiàn)，F(xiàn)sm 可以用于執(zhí)行復(fù)雜的 AI 。他們也可以表示使用圖，允許開發(fā)人員很容易理解，因此開發(fā)人員可以調(diào)整、 改變和優(yōu)化的最終結(jié)果。有限狀態(tài)機(jī)使用的函數(shù)或方法來代表狀態(tài)執(zhí)行是簡單、 功能強(qiáng)大、 易于擴(kuò)展。  可以使用基于堆棧的狀態(tài)機(jī)，確保易于管理和穩(wěn)定的 執(zhí)行流，而不會產(chǎn)生消極影響的代碼應(yīng)用甚至更復(fù)雜的 AI。 所以讓你的敵人更聰明使用有限狀態(tài)機(jī)，讓您的游戲的成功。