4-17 Wandering NPCs

前一章我們完成了簡單的NPC系統，但是NPC在場景中亂跑，這樣的感覺很奇怪對吧？所以本章要教大家製作走路的NPC。

首先，請大家看看NPC使用的ThirdPersonAnimatorControl。

在Animator視窗點擊Grounded狀態。

從Inspector視窗會看見Motion的部分使用的Blend Tree，請點兩下開啟。

開啟後會看見如下圖的視窗，當紅點在中央下方時，角色的狀態是不會動的Idle狀態。

當紅點調整到最上面，就會發現角色開始跑起來了。

如果將紅點慢慢移到下方，角色的動作又會變得緩慢，像是在走路一樣。

所以，根據以上介紹的機制，透過調整Forward數值，可以控制角色的動作是偏向走路或者跑步。程式碼中在Character.cs中的UpdateAnimator方法，於forwardAmount中乘以一個參數，名為animatorForwardCap，這個參數會設為SerializeField。

修改後的Character.cs如下：

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using System; using UnityEngine; using UnityEngine.AI; using RPG.CameraUI;   namespace RPG.Character{  [SelectionBase]  public class Character : MonoBehaviour  {   [Header("Audio")]   [Range(0.0f, 1.0f)][SerializeField] float spatialBlend = 1f;     [Header("Capsule Collider")]   [SerializeField] Vector3 colliderCenter = new Vector3(0, 1, 0);   [SerializeField] float colliderRadius = 0.3f;   [SerializeField] float colliderHeight = 1.5f;     [Header("Animator")]   [SerializeField] RuntimeAnimatorController animatorController;   [SerializeField] AnimatorOverrideController animatorOverrideController;   [SerializeField] Avatar avatar;   [Range(0.0f, 1.0f)][SerializeField] float animatorForwardCap = 1f;     [Header("Movement")]   [SerializeField] float moveSpeedMultiplier = 1f;   [SerializeField] float animationSpeedMultiplier = 1f;   [SerializeField] float movingTurnSpeed = 1800;   [SerializeField] float stationaryTurnSpeed = 1800;   [SerializeField] float moveThreshold = 1f;     [Header("Nav Mesh Agent")]   [SerializeField] float steeringSpeed = 1.0f;     NavMeshAgent navMeshAgent = null;   Animator animator = null;   Rigidbody myRigidbody = null;   float turnAmount;   float forwardAmount;   bool isAlive = true;     void Awake(){    AddRequiredComponents ();   }     private void AddRequiredComponents(){    CapsuleCollider capsuleCollider = gameObject.AddComponent<capsulecollider> ();    capsuleCollider.center = colliderCenter;    capsuleCollider.radius = colliderRadius;    capsuleCollider.height = colliderHeight;      myRigidbody = gameObject.AddComponent<rigidbody> ();    myRigidbody.collisionDetectionMode = CollisionDetectionMode.Continuous;    myRigidbody.constraints = RigidbodyConstraints.FreezeRotation;      AudioSource audioSource = gameObject.AddComponent<audiosource> ();    audioSource.spatialBlend = spatialBlend;      animator = gameObject.AddComponent<animator> ();    animator.runtimeAnimatorController = animatorController;    animator.avatar = avatar;      navMeshAgent = gameObject.AddComponent<navmeshagent> ();    navMeshAgent.updateRotation = false;    navMeshAgent.updatePosition = true;    navMeshAgent.speed = steeringSpeed;   }     void Update(){    if (navMeshAgent.remainingDistance > navMeshAgent.stoppingDistance && isAlive) {     Move(navMeshAgent.desiredVelocity);    } else {     Move (Vector3.zero);    }   }     void Move(Vector3 movement)   {    SetForwardAndTurn (movement);    ApplyExtraTurnRotation();    UpdateAnimator();   }     public float GetAnimSpeedMultiplier(){    return animator.speed;   }     public void Kill(){    isAlive = false;   }     public void SetDestination(Vector3 worldPos){    navMeshAgent.SetDestination(worldPos);   }     public void SetStopDistance(float stoppingDistance){    navMeshAgent.stoppingDistance = stoppingDistance;   }     public AnimatorOverrideController GetOverrideController(){    return animatorOverrideController;   }     private void SetForwardAndTurn(Vector3 movement){    // 將Wolrd相對的向量轉換成Local相對的向量    if (movement.magnitude > moveThreshold) {     movement.Normalize ();    }    // 將Worldspace的方向轉換成LocalSpace    Vector3 localMovement = transform.InverseTransformDirection(movement);    turnAmount = Mathf.Atan2(localMovement.x, localMovement.z);    forwardAmount = localMovement.z;   }     void UpdateAnimator()   {    // update the animator parameters    animator.SetFloat("Forward", forwardAmount * animatorForwardCap, 0.1f, Time.deltaTime);    animator.SetFloat("Turn", turnAmount, 0.1f, Time.deltaTime);    animator.speed = animationSpeedMultiplier;   }     void ApplyExtraTurnRotation()   {    // help the character turn faster (this is in addition to root rotation in the animation)    float turnSpeed = Mathf.Lerp(stationaryTurnSpeed, movingTurnSpeed, forwardAmount);    transform.Rotate(0, turnAmount * turnSpeed * Time.deltaTime, 0);   }     void OnAnimatorMove(){    if (Time.deltaTime > 0) {     Vector3 velocity = (animator.deltaPosition * moveSpeedMultiplier) / Time.deltaTime;     // 保持y軸的速度不變     velocity.y = myRigidbody.velocity.y;     myRigidbody.velocity = velocity;    }   }  } } </navmeshagent></animator></audiosource></rigidbody></capsulecollider>

修改好程式碼後，大家可以參考下圖的參數進行Character的設定，我將Animator Forward Cpa設為0.3，Move Speed Multiplier設為0.3，Moving Turn Speed跟Stationary Turn Speed設為100。

 執行遊戲，NPC成功在巡邏點上緩慢地行走嘍！