How to make shotgun bullet spread?, How to make bullet spread for shotgun?

Hi! You shoot the raycast in the direction fpsCam.transform.forward . So you could add fpsCam.transform.right and .up after multiplying them with some small random number (-0.1 to +0.1). (You could take the desired angle and use the sine function on it to get the max value for the factor.) This would result in a rectangel for the spray.

Here is the modified code:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 [RequireComponent(typeof(AudioSource))]
 public class MouseShoot : MonoBehaviour
 {
     public float range = 5000;
     public float damage = 10;
     public float sprayFactor = 0.1f;
     public int numberOfProjectiles = 10;
     public AudioClip fireSoundEffects;
 
     private Camera fpsCam;
     private AudioSource source;
 
     void Start()
     {
         fpsCam = Camera.main;
         source = GetComponent<AudioSource>();
     }
 
     void Update()
     {
         if (Input.GetButtonDown("Fire1"))
         {
             source.PlayOneShot(fireSoundEffects);
             Vector3 rayOrigin = fpsCam.ViewportToWorldPoint(new Vector3(0.5f, 0.5f, 0.0f));
 
             for(int i = 0; i < numberOfProjectiles; i++)
             {
 
                 Vector3 direction = fpsCam.transform.forward;
                 direction += fpsCam.transform.up * Random.Range(-sprayFactor, sprayFactor);
                 direction += fpsCam.transform.right * Random.Range(-sprayFactor, sprayFactor);
 
                 RaycastHit hit;
                 if (Physics.Raycast(rayOrigin, direction.normalized, out hit, range))
                 {
                     if (hit.collider.GetComponent<IDamagable>() != null)
                     {
                         hit.collider.GetComponent<IDamagable>().TakeDamage(damage);
                     }
                 }
             }
         }
     }
 }

If you want it to be a circle, you can set a maximum value for the spread. Next you get a random number, which is smaller, than that max value (and use it as the factor for the first direction - up or right), square it, and subtract it from the square of the max value. Form the root of the result and you got your second factor, for the other direction (up or right). root(maxValue² - firstFactor²) = second factor.