Shoot in proper direction with spread?

Question

I'm trying to make a shotgun in a 2D game. I currently have this:

      public void Shoot()
      {
          int rotZ = -10;
          for (int i = 0; i < 3; i++)
          {
              Instantiate(bulletPrefab, firePoint.position, Quaternion.Euler(0, 0, rotZ));
              rotZ += 10;
          }
      }

this works great for the spread, but completely ignores the rotation of my firePoint. I am aware this is because I replaced firePoint.rotation with rotZ, but what I want is to be able to use rotZ for the spread as well as firePoint.rotation for the direction at the same time. Does anyone know how I might do this? thanks!

Answer 1

Best Answer

Answer by AaronBacon · Dec 11, 2021 at 04:48 PM

A very easy way would be to just have the Bullet script randomly rotate itself slightly on Awake:

⠀

 public class Bullet : MonoBehaviour
 {
     //Awake will be called when the bullet is created
     void Awake()
     {
       transform.Rotate(0f,0f,Random.Range(-10f,10f));
     }
 }

Though you could also do this when spawning the bullet like so:

⠀

     private void Shoot()
     {
         for (int i = 0; i < 3; i++)
         {
             GameObject bullet = Instantiate(bulletPrefab, firePoint.position, firePoint.rotation);
             bullet.transform.Rotate(0f,0f,Random.Range(-10f,10f));
         }
     }

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falconstrike209 · Dec 11, 2021 at 05:05 PM 1

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I just put it on like this:

     public void Shoot()
     {
         int rotZ = -10;
         for (int i = 0; i < 3; i++)
         {
             GameObject bullet = Instantiate(bulletPrefab, firePoint.position, firePoint.rotation);
             bullet.transform.Rotate(0f, 0f, rotZ);
             rotZ += 10;
         }
     }

and it worked like a charm. Thanks!

AaronBacon falconstrike209 · Dec 11, 2021 at 05:12 PM 0

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Ah right, I think I misunderstood what you were trying to do, but yep that works for having a set spread, which thinking about it is probably better for 2D

falconstrike209 · Dec 11, 2021 at 05:31 PM 0

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anyway, while you're here, do you know how I might go about adding knockback to the player when shooting? The gun is a child object of the player, if that means anything about how it would work

AaronBacon falconstrike209 · Dec 11, 2021 at 05:55 PM 0

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Depends on what kind of knockback you want. Assu$$anonymous$$g the player has a RigidBody Component you can use this to knock them back in the reverse direction of their gun:

⠀

 ⠀   Rigidbody2D rb2d;
       public float blastForce = 10f;
      void Awake()
      {
        rb2d = GetComponent<RigidBody2D>();
      }

 public void Shoot()
  {
      int rotZ = -10;
      for (int i = 0; i < 3; i++)
      {
          GameObject bullet = Instantiate(bulletPrefab, firePoint.position, firePoint.rotation);
          bullet.transform.Rotate(0f, 0f, rotZ);
          rotZ += 10;
      }
         Vector3 knockbackDirection= transform.position - firepoint.position;
         direction.Normalize();
         rb2d.AddForce(direction * blastForce);
  }

⠀ I wrote this code a while back so it might not be exactly what you need, if you need more simple knockback (IE, just push the player backwards horizontally a bit) you can look into Rigidbody2D's AddRelativeForce function

falconstrike209 AaronBacon · Dec 11, 2021 at 06:22 PM 1

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I changed it to modify velocity instead of addForce, as well as added a bool to cancel the player movement as that had been interfering, but it's working exactly how I wanted it to! thanks so much dude, you're awesome!

Shoot in proper direction with spread?

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