Fps射击游戏开发：第二回

本文介绍

在上一篇文章中我们介绍了一些基本的先验内容，并且搭建了一个基础场景。本文目标，挂载枪支，并实现子弹射击逻辑

枪支挂载

1. 首先需要创建枪支的刚体，用了三个cube搭建，同时把他用一个整体包裹，方便后续敌人复用。

   

2. 编写对应Gun和GunController，具体代码如下：

Gun.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Gun : MonoBehaviour
{
    // Start is called before the first frame update
    void Start()
    {
        
    }

    // Update is called once per frame
    void Update()
    {
        
    }
}

GunController

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class GunController : MonoBehaviour
{
    public Transform weaponHold;
    public Gun startingGun;
    Gun equippedGun;
    void Start()
    {
        if (startingGun != null)
        {
            EquipGun(startingGun);
        }
    }
    public void EquipGun(Gun gunToEquip)
    {
        if (equippedGun != null)
        {
            Destroy(equippedGun.gameObject);
        }
        equippedGun = Instantiate(gunToEquip, weaponHold.position, weaponHold.rotation) as Gun;
        equippedGun.transform.parent = weaponHold;
    }

}

GunController.cs文件直接拖入player这个刚体中绑定，就是那个大圆柱刚体。同时记得把Gun图形文件拖入GunController的Starting Gun中进行绑定。

3. 创建挂载点
   因为我们需要枪支能够随着人物的位置、方向的变动而变动，所以通常做法就是给player设置一个挂载点（空的刚体），在本文中，就是那个weapon Hold，将其拖入GunController的Weapon Hold中。以此完成挂载点图形和变量的绑定。

效果如下：

子弹射击

1. 创建子弹代码。

   using System.Collections;
   using System.Collections.Generic;
   using UnityEngine;
   
   public class ProjectTile : MonoBehaviour
   {
       float speed = 10;
       public void SetSpeed(float newSpeed)
       {
           speed = newSpeed;
       }
       // Update is called once per frame
       void Update()
       {
           transform.Translate(Vector3.forward * Time.deltaTime * speed);
       }
   }
   

2. 修改Gun文件

   using System.Collections;
   using System.Collections.Generic;
   using UnityEngine;
   
   public class Gun : MonoBehaviour
   {
       public Transform muzzle;
       public ProjectTile projecttile;
       public float msBetweenShots = 100;
       public float muzzleVelocity = 35;
       float nextShootTime;
       public void Shoot() {
           if (Time.time > nextShootTime) {
               nextShootTime = Time.time + msBetweenShots / 1000;
               ProjectTile newProjectTile = Instantiate(projecttile, muzzle.position, muzzle.rotation);
               newProjectTile.SetSpeed(muzzleVelocity);
           }
       }
   
       
   }
   

3. 捕获鼠标左键点击

   using System.Collections;
   using System.Collections.Generic;
   using System.ComponentModel;
   using UnityEngine;
   
   [RequireComponent(typeof(PlayerController))]
   [RequireComponent(typeof(GunController))]
   public class Player : MonoBehaviour
   {
       public float moveSpeed = 5;
       public Camera mainCamera; // 在Inspector中拖入主相机
       PlayerController controller;
       GunController gunController;
   
       void Start()
       {
           controller = GetComponent<PlayerController>();
           gunController = GetComponent<GunController>();
           // 自动获取主相机（如果没手动拖入）
           if (mainCamera == null)
               mainCamera = Camera.main;
       }
   
   
       void Update()
       {
      ...
      ...
           // weapon
           if (Input.GetMouseButton(0))
           {
               gunController.Shoot();
           }
   
   
       }
   ...
   ...
   }
       

4. 修改guncontrol

   using System.Collections;
   using System.Collections.Generic;
   using UnityEngine;
   
   public class GunController : MonoBehaviour
   {
       public Transform weaponHold;
       public Gun startingGun;
       Gun equippedGun;
   ...
   ...
       public void Shoot()
       {
   
           if (equippedGun != null)
           {
               equippedGun.Shoot();
           }
       }
   
   }
   

最终效果：