Unity realizes the simple function of firing bullets

Foreword: I believe everyone is familiar with shooting games. So to achieve this function, we usually use two methods:

1. Ray Tracing. 

2. Bullet instantiation.

Today, we use the second method to realize the launch function.

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1. First, we prepare a gun model, put it in the scene, and adjust the position.

 2. We create an empty object at a point in front of the muzzle, as the launch port, and adjust the position (note: the position of the launcher should not be too close to the gun body)

 

 3. Make a simple bullet. Here we use the capsule body, just change the size and rotation scheduling. (Note: The parameters here are for reference only, and you can add a shader to make it change color)

 

 4. Instantiate and generate bullets. Now, we make the bullets we made into prefabs and create a new script on the gun launcher. (Note: The Rotation of the launcher should be consistent with that of the bullet)

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

public class GunShoot : MonoBehaviour {

    public GameObject bulletPrefab;  //子弹预制体
	
	void Update () {

        Shoot();  
    }

    void Shoot()
    {
        if (Input.GetMouseButtonDown(0))  //如果按下鼠标左键，生成预制体
        {
            Instantiate(bulletPrefab, transform.position, transform.rotation);  //生成预制体
        }
    }

}

  Don't forget to drag the prefab of the bullet into the script after writing. Now, we can generate a bullet by pressing the left mouse button, but we can't fire it yet.

5. Let's create a new script for the bullet to make it move.

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

public class Bullet : MonoBehaviour {
    public float speed = 8f;  //子弹速度

	void Start () {
        Destroy(gameObject, 7f);  //7s后销毁自身
    }
	
	void Update () {
        transform.Translate(0, Time.deltaTime * speed, 0);  //子弹位移     
	}

}

 In this way, we can fire a bullet by clicking the left mouse button.