RaycastShootTriggerable

using UnityEngine;
using System.Collections;

public class RaycastShootTriggerable : MonoBehaviour {

    [HideInInspector] public int gunDamage = 1;                            // Set the number of hitpoints that this gun will take away from shot objects with a health script.
    [HideInInspector] public float weaponRange = 50f;                    // Distance in unity units over which the player can fire.
    [HideInInspector] public float hitForce = 100f;                        // Amount of force which will be added to objects with a rigidbody shot by the player.
    public Transform gunEnd;                                            // Holds a reference to the gun end object, marking the muzzle location of the gun.
    [HideInInspector] public LineRenderer laserLine;                    // Reference to the LineRenderer component which will display our laserline.

    private Camera fpsCam;                                                // Holds a reference to the first person camera.
    private WaitForSeconds shotDuration = new WaitForSeconds(.07f);        // WaitForSeconds object used by our ShotEffect coroutine, determines time laser line will remain visible.


    public void Initialize ()
    {
        //Get and store a reference to our LineRenderer component
        laserLine = GetComponent<LineRenderer> ();

        //Get and store a reference to our Camera
        fpsCam = GetComponentInParent<Camera> ();
    }

    public void Fire()
    {

        //Create a vector at the center of our camera's near clip plane.
        Vector3 rayOrigin = fpsCam.ViewportToWorldPoint (new Vector3 (.5f, .5f, 0));

        //Draw a debug line which will show where our ray will eventually be
        Debug.DrawRay (rayOrigin, fpsCam.transform.forward * weaponRange, Color.green);

        //Declare a raycast hit to store information about what our raycast has hit.
        RaycastHit hit;

        //Start our ShotEffect coroutine to turn our laser line on and off
        StartCoroutine(ShotEffect());

        //Set the start position for our visual effect for our laser to the position of gunEnd
        laserLine.SetPosition(0, gunEnd.position);

        //Check if our raycast has hit anything
        if (Physics.Raycast(rayOrigin,fpsCam.transform.forward, out hit, weaponRange))
        {
            //Set the end position for our laser line
            laserLine.SetPosition(1, hit.point);

            //Get a reference to a health script attached to the collider we hit
            ShootableBox health = hit.collider.GetComponent<ShootableBox>();

            //If there was a health script attached
            if (health != null)
            {
                //Call the damage function of that script, passing in our gunDamage variable
                health.Damage (gunDamage);
            }

            //Check if the object we hit has a rigidbody attached
            if (hit.rigidbody != null)
            {
                //Add force to the rigidbody we hit, in the direction it was hit from
                hit.rigidbody.AddForce (-hit.normal * hitForce);
            }
        }
        else
        {
            //if we did not hit anything, set the end of the line to a position directly away from
            laserLine.SetPosition(1, fpsCam.transform.forward * weaponRange);
        }
    }

    private IEnumerator ShotEffect()
    {

        //Turn on our line renderer
        laserLine.enabled = true;
        //Wait for .07 seconds
        yield return shotDuration;

        //Deactivate our line renderer after waiting
        laserLine.enabled = false;
    }
}