public GameObject spawnPoint;           // Empty gameobject at the end of our gun so we know where to shoot the ray from



    public float lastFireTime;              // The last time we fired a shot so we can work out if were allowed to shoot



    void Update () {



        // If we press our left mouse button

        if (Input.GetButton("Fire1")) {



            // If the last time we fired is more than 0.15 seconds ago

            if (Time.time - lastFireTime > 0.15) {



                // Run the Fire function

                Fire();



                // Set our last fire time to now

                lastFireTime = Time.time;

            }



        }



    }



    void Fire () {

        // If our raycast is set off all the data about what was hit will be stored in this variable

        RaycastHit hit;



        // This creates our raycast at spawnPoint.transform.position which is at the end of our gun

        // The 2nd one is the direction, for this it will be forward of our rays spawnpoint

        // The 3rd one is how long will the ray be, in this case its infinity

        // This wont effect the performance so dont worry

        if (Physics.Raycast(spawnPoint.transform.position, spawnPoint.transform.forward, Mathf.Infinity, out hit)) {



            // Get the tag from what we collided with and if its "Player"

            if (hit.collider.gameObject.tag == "Player") {



                // How much damage to inflict

                int damageInt = 10;



                // This gets the gameObject of what we hit and sends a message to it

                // Telling it to run a function called removeHealth() and send it a value of damageInt

                // removeHealth a function of a script attached to your player

                hit.collider.gameObject.SendMessage("removeHealth", damageInt);

            }

        }

    }



    // This will be an example of the function receiving the damage

    // This will be in a script on player

    // This will expect an int from what ever is calling it

    void removeHealth (int i) {



        // Remove the health from your player

        myPlayerHealthVar -= i;



    }