unity3d-游戏实战突出重围，第四天 添加角色

1：添加unity自带的第一人称角色控制器，命名为hreo

2：添加第三人称角色控制器。这里是添加源文件Sources下面的。如箭头指示：而不是“3rd Person Controller”。并命名为NPC。并设置预设，和加上BOX碰撞器。产生多个NPC。结构图：

3：修改hreo自带的Mouse Look脚本

 using UnityEngine;
 using System.Collections;

 /// MouseLook rotates the transform based on the mouse delta.
 /// Minimum and Maximum values can be used to constrain the possible rotation

 /// To make an FPS style character:
 /// - Create a capsule.
 /// - Add the MouseLook script to the capsule.
 ///   -> Set the mouse look to use LookX. (You want to only turn character but not tilt it)
 /// - Add FPSInputController script to the capsule
 ///   -> A CharacterMotor and a CharacterController component will be automatically added.

 /// - Create a camera. Make the camera a child of the capsule. Reset it's transform.
 /// - Add a MouseLook script to the camera.
 ///   -> Set the mouse look to use LookY. (You want the camera to tilt up and down like a head. The character already turns.)
 [AddComponentMenu("Camera-Control/Mouse Look")]
 public class MouseLook : MonoBehaviour {

     public enum RotationAxes { MouseXAndY = , MouseX = , MouseY =  }
     public RotationAxes axes = RotationAxes.MouseXAndY;
     public float sensitivityX = 15F;
     public float sensitivityY = 15F;

     public float minimumX = -360F;
     public float maximumX = 360F;

     public float minimumY = -60F;
     public float maximumY = 60F;

     float rotationY = 0F;

     //鼠标准心
     public Texture2D tex_fire;

     void Update ()
     {
         if (axes == RotationAxes.MouseXAndY)
         {
             //float rotationX = transform.localEulerAngles.y + Input.GetAxis("Mouse X") * sensitivityX;

             //rotationY += Input.GetAxis("Mouse Y") * sensitivityY;
             //rotationY = Mathf.Clamp (rotationY, minimumY, maximumY);

             //transform.localEulerAngles = new Vector3(-rotationY, rotationX, 0);
         }
         else if (axes == RotationAxes.MouseX)
         {
             transform.Rotate(, Input.GetAxis("Mouse X") , );
         }
         else
         {
             //rotationY += Input.GetAxis("Mouse Y") * sensitivityY;
             //rotationY = Mathf.Clamp (rotationY, minimumY, maximumY);

             transform.localEulerAngles = new Vector3(-rotationY, transform.localEulerAngles.y, );
         }
     }

     void OnGUI()
     {
         if (tex_fire)
         {
             //绘制鼠标准心
             float x = Input.mousePosition.x - tex_fire.width / ;
             float y = Screen.height - Input.mousePosition.y - tex_fire.height / ;

             GUI.DrawTexture(new Rect(x, y, tex_fire.width, tex_fire.height), tex_fire);
         }
     }

     void Start ()
     {
         // Make the rigid body not change rotation
         if (GetComponent<Rigidbody>())
             GetComponent<Rigidbody>().freezeRotation = true;

         //取消鼠标默认状态
         Screen.showCursor = false;
     }
 }

5 ：编写脚本命名为dr.cs绑定到NPC上

 using UnityEngine;
 using System.Collections;

 public class dr : MonoBehaviour
 {

     //是否绘制敌人血条
     bool showBlood = false;
     //血条资源贴图
     public Texture2D tex_red;
     public Texture2D tex_black;
     //生命值
     private int HP = ;
     //主角对象
     private GameObject hero;
     // Use this for initialization
     void Start()
     {
         hero = GameObject.Find("Hero");
     }

     // Update is called once per frame
     void Update()
     {
         //设置始终朝向
         transform.LookAt(hero.transform);
     }

     void OnGUI()
     {
         if (showBlood)
         {
             //绘制敌人血条
             int blood_widht = tex_red.width * HP / ;
             GUI.DrawTexture(new Rect(, , tex_black.width, tex_black.height), tex_black);
             GUI.DrawTexture(new Rect(, , blood_widht, tex_red.height), tex_red);
         }
     }

     /// <summary>
     /// 当鼠标在GUIElement(GUI元素)或Collider(碰撞体)上点击时调用OnMouseDown。
     /// </summary>
     void OnMouseDown()
     {
         //敌人击中目标
         if (HP > )
         {
             //减血
             HP -= ;
             //击打回馈
         }
     }
     /// <summary>
     /// 当用户释放鼠标按钮时调用OnMouseUp。
     /// </summary>
     void OnMouseUp()
     {
         //击打敌人后移动一段距离
         transform.Translate(Vector3.back * 0.1f);
     }
     /// <summary>
     /// 当鼠标悬浮在GUIElement(GUI元素)或Collider(碰撞体)上时调用 OnMouseOver 。
     /// </summary>
     void OnMouseOver()
     {
         //当对着敌人时，开始绘制血条,即显示敌人当前的血条
         showBlood = true;

     }
     /// <summary>
     /// 当Collider(碰撞体)停止触发trigger(触发器)时调用OnTriggerExit。
     /// </summary>
     void OnMouseExit()
     {
         //结束绘制血条
         showBlood = false;
     }
 }

7：dr.cs脚本实现了。当鼠标指向敌人时，显示敌人当前的血条情况，

当击中敌人时候。敌人会后退几步。

dr.cs脚本升级：敌人AI即人工智能

 实现功能：让NPC有自己的生命周期：就是自己巡逻。当在巡逻范围内看到hero，即跑向hero开始攻击(这里暂为实现)

 using UnityEngine;
 using System.Collections;

 public class drAI : MonoBehaviour
 {

     //敌人状态

     //敌人站立状态
     public const int STATE_STAND = ;
     //敌人行走状态
     public const int STATE_WALK = ;
     //敌人奔跑状态
     public const int STATE_RUN = ;
     //记录敌人的当前状态
     private int enemyState;
     //主角对象
     private GameObject hero;
     //备份上一次的敌人思考时间
     private float backUptime;
     //敌人思考下一次行为的时间
     public const int AI_THINK_TIME = ;
     //敌人的巡逻范围
     public const int AI_ATTACK_DISTANCE = ;

     // Use this for initialization
     void Start()
     {
         //得到主角对象
         hero = GameObject.Find("/Hero");
         //设置敌人的默认状态为站立
         enemyState = STATE_WALK;
     }

     // Update is called once per frame
     void Update()
     {
         //判断敌人与主角的距离 当在巡逻范围内
         if (Vector3.Distance(transform.position, hero.transform.position) < AI_ATTACK_DISTANCE)
         {
             //敌人进入奔跑状态
             gameObject.animation.Play("run");
             enemyState = STATE_RUN;
             //设置敌人面朝主角方向
             transform.LookAt(hero.transform);
         }
             //敌人进入巡逻状态
         else
         {
             //计算敌人的思考时间
             if (Time.time - backUptime >= AI_THINK_TIME)
             {
                 //敌人开始思考
                 backUptime = Time.time;
                 //取得0~2之间的随机数
                 int rand = Random.Range(, );
                 if (rand == )
                 {
                     //敌人进入站立状态
                     gameObject.animation.Play("idle");
                     enemyState = STATE_STAND;
                 }
                 else if (rand == )
                 {
                     //敌人进入行走状态
                     //敌人随机旋转角度
                     Quaternion rotate = Quaternion.Euler(, Random.Range(, ) * , );
                     //1秒内完成敌人旋转
                     transform.rotation = Quaternion.Slerp(transform.rotation, rotate, Time.deltaTime * );
                     //播放行走动画
                     gameObject.animation.Play("walk");
                     enemyState = STATE_WALK;
                 }
             }
         }
         switch (enemyState)
         {
             case STATE_STAND: break;
             case STATE_WALK:
                 //敌人行走
                 transform.Translate(Vector3.forward * Time.deltaTime);
                 break;
             case STATE_RUN:
                 //敌人朝向主角奔跑
                 if (Vector3.Distance(transform.position, hero.transform.position) > )
                 {
                     transform.Translate(Vector3.forward * Time.deltaTime * );
                 }
                 break;
             default:
                 break;
         }
     }
 }

 知识点：

    Quaternion四元素表示旋转。Quaternion.Euler()方法返回一个旋转的四元素。该方法参数表示旋转的三维角度。执行该方法后，将

四元素赋值给一个对象的旋转变量

transform.rotation = rotate

即可在一帧内完成旋转，若想在一段时间内完成旋转，就需要用到

Quaternion.Slerp()方法：
第一个参数表示模型旋转的起始角度
第二参数表示模型的结束角度
第三个参数表示旋转消耗的时间