Question how to make spray pattern

i want a spray parrent like in csgo, my fire function below

Code (CSharp):

1. public void Shoot(){
2.         currentAmmo --;
3.         RaycastHit hit;
4.         if(Physics.Raycast(fpsCam.transform.position, fpsCam.transform.forward, out hit, range)){
5.             Debug.Log(hit.transform.name);
6.             Instantiate(bulletPref, bulletSpawn.transform.position, Quaternion.identity);
7.             Target target = hit.transform.GetComponent<Target>();
8.             if(target != null){
9.                 target.TakeDamage(damage);
10.             }
11.             if(hit.rigidbody != null){
12.                 hit.rigidbody.AddForce(-hit.normal * impactForce);
13.             }
14.             if(hit.collider.tag == "Zombie"){
15.                 target.TakeDamage(damage);
16.             }
17.             GameObject impactGo = Instantiate(impactEffect, hit.point, Quaternion.LookRotation(hit.normal));
18.             Destroy(impactGo,2f);
19.         }
20.     }

with this function my bullet always going straight.(i dont want them to go randomly, i want spray pattern)

 

Define spray pattern. Draw a picture.
If you want normal distribution, check Gaussian distribution, you can use a simple numerical technique called Marsaglia polar. You can thus use a regular linear random value (i.e. Random.value) to feed this function which gives you a normally distributed 2D point. With some fiddling you can easily make a shotgun blast pattern, and generate rays from this etc. For any other kind of spray pattern, you need to be more specific.

 

Ask yourself this: what is a spray pattern, other than the bullet being fired in a "random" direction with some limitations? There is various ways to implement this, depending on what you really want.

Shooters are one of the most common genres. You will find thousands of tutorials on pretty much anything commonly involved. Did you try googling for "unity weapon spread"? What issues did you have with the results?

 

Edit: misread question

 

Code (CSharp):

1.             Vector3 wobble=Random.onUnitSphere*0.1f;
2.             if(Physics.Raycast(fpsCam.transform.position, fpsCam.transform.forward+wobble, out hit, range))