Use raycast to fix bullet's direction?

Question

Player cam has a raycast. I need it to work as pointer for player's bullet direction. If the ray hits any kind of object this spot will be the aim of player's bullets.

Here is my script

public class camraycast : MonoBehaviour {

Camera mycamera;
GameObject prefab;

public int bulletSpeed = 10;
public GameObject angle; //  camera 
public GameObject players;


void Start () {
    prefab = Resources.Load("bullets") as GameObject;
    mycamera = GetComponent<Camera>();
}

void Update() {

    if (Input.GetMouseButtonDown(0))
    {
        Vector3 camScreen = new Vector3(0.5f, 0.5f, 0f); // center of the screen
        float rayLength = 100f;
        Ray ray = mycamera.ViewportPointToRay(camScreen);
        RaycastHit hit;
        Debug.DrawRay(ray.origin, ray.direction * rayLength, Color.red);

        if (Physics.Raycast(ray, out hit, rayLength))
        {
            print ("Looking at : " + hit.transform.name);
            GameObject bullets = Instantiate(prefab) as GameObject;
            bullets.transform.position = players.transform.position + angle.transform.forward * 0.1f;
            Rigidbody rb = bullets.GetComponent<Rigidbody>();
            rb.AddForce((hit.point - angle.transform.position) * bulletSpeed);
            Destroy(bullets, 9f);
        }
    }
    Vector3 camScreens = new Vector3(0.5f, 0.5f, 0f); // center of the screen
    float rayLengths = 100f;
    Ray rays = mycamera.ViewportPointToRay(camScreens);
    Debug.DrawRay(rays.origin, rays.direction * rayLengths, Color.red);
}
}

Answer 1

Most FPS games just use HitScanning, where they fire a ray out the centre of the screen and get back the first object it hits, applying logic to that object. Any bullets coming out of the weapon itself are just graphical assets and don't actually interact with anything.

If, however, you do really want to simulate the physics of bullets, then what you can do is add in the line

bullets.transform.LookAt (hit.transform);

after you instantiate but before you add the force and it should make the bullet rotate to look directly at the object that the raycast hit, before you fire it off.