adding damage to my rocket

Questions & Answers
1

i was watching the fps techzone tutorial and noticed the rockets dont do damage does anyone know how to add it? please help! rocket script:

var projectile : Rigidbody;
var initialSpeed = 20.0;
var reloadTime = 0.5;
var ammoCount = 20;
private var lastShot = -10.0;

function Fire () {
    // Did the time exceed the reload time?
    if (Time.time > reloadTime + lastShot && ammoCount > 0) {
        // create a new projectile, use the same position and rotation as the Launcher.
        var instantiatedProjectile : Rigidbody = Instantiate (projectile, transform.position, transform.rotation);

        // Give it an initial forward velocity. The direction is along the z-axis of the missile launcher's transform.
        instantiatedProjectile.velocity = transform.TransformDirection(Vector3 (0, 0, initialSpeed));

        // Ignore collisions between the missile and the character controller
        Physics.IgnoreCollision(instantiatedProjectile.collider, transform.root.collider);

        lastShot = Time.time;
        ammoCount--;
    }
}

if it helps here is the machine gun script with damage from same download:

var range = 100.0;
var fireRate = 0.05;
var force = 10.0;
var damage = 5.0;
var bulletsPerClip = 40;
var clips = 20;
var reloadTime = 0.5;
private var hitParticles : ParticleEmitter;
var muzzleFlash : Renderer;

private var bulletsLeft : int = 0;
private var nextFireTime = 0.0;
private var m_LastFrameShot = -1;

function Start () {
    hitParticles = GetComponentInChildren(ParticleEmitter);

    // We don't want to emit particles all the time, only when we hit something.
    if (hitParticles)
        hitParticles.emit = false;
    bulletsLeft = bulletsPerClip;
}

function LateUpdate() {
    if (muzzleFlash) {
        // We shot this frame, enable the muzzle flash
        if (m_LastFrameShot == Time.frameCount) {
            muzzleFlash.transform.localRotation = Quaternion.AngleAxis(Random.value * 360, Vector3.forward);
            muzzleFlash.enabled = true;

            if (audio) {
                if (!audio.isPlaying)
                    audio.Play();
                audio.loop = true;
            }
        } else {
        // We didn't, disable the muzzle flash
            muzzleFlash.enabled = false;
            enabled = false;

            // Play sound
            if (audio)
            {
                audio.loop = false;
            }
        }
    }
}

function Fire () {
    if (bulletsLeft == 0)
        return;

    // If there is more than one bullet between the last and this frame
    // Reset the nextFireTime
    if (Time.time - fireRate > nextFireTime)
        nextFireTime = Time.time - Time.deltaTime;

    // Keep firing until we used up the fire time
    while( nextFireTime < Time.time && bulletsLeft != 0) {
        FireOneShot();
        nextFireTime += fireRate;
    }
}

function FireOneShot () {
    var direction = transform.TransformDirection(Vector3.forward);
    var hit : RaycastHit;

    // Did we hit anything?
    if (Physics.Raycast (transform.position, direction, hit, range)) {
        // Apply a force to the rigidbody we hit
        if (hit.rigidbody)
            hit.rigidbody.AddForceAtPosition(force * direction, hit.point);

        // Place the particle system for spawing out of place where we hit the surface!
        // And spawn a couple of particles
        if (hitParticles) {
            hitParticles.transform.position = hit.point;
            hitParticles.transform.rotation = Quaternion.FromToRotation(Vector3.up, hit.normal);
            hitParticles.Emit();
        }

        // Send a damage message to the hit object          
        hit.collider.SendMessageUpwards("ApplyDamage", damage, SendMessageOptions.DontRequireReceiver);
    }

    bulletsLeft--;

    // Register that we shot this frame,
    // so that the LateUpdate function enabled the muzzleflash renderer for one frame
    m_LastFrameShot = Time.frameCount;
    enabled = true;

    // Reload gun in reload Time        
    if (bulletsLeft == 0)
        Reload();           
}

function Reload () {

    // Wait for reload time first - then add more bullets!
    yield WaitForSeconds(reloadTime);

    // We have a clip left reload
    if (clips > 0) {
        clips--;
        bulletsLeft = bulletsPerClip;
    }
}

function GetBulletsLeft () {
    return bulletsLeft;
}
2

To do damage, you must have something that takes the damage. Make a enemy status script, if don't have one already, for if you do, put it in your question.

Ok, you need to check to see if the rocket hit a valid target. Add a rocket damage script to the rocket you are instantiating. Using 

OnColliderEnter (collider : Collision)

Add a "Enemy" tag to the thing your shooting at and check to see if the rocket hit something with that tag. If it has, send a message using 

yourEnemyObject.SendMessage(SubtractHealth, damage);

in the rocket damage script. This will run the SubtractHealth function with parameters "damage" in the enemy status script. For the complete script, comment on this saying so.

EDIT:

Actually, an easier way is to just have a hitPoints variable, and subtract form that.

"RocketStatus" (The one that goes on the rocket itself)

var damage : float = 1;

function OnCollisionEnter (thing : Collision) {
    if(thing.gameObject.tag == "Enemy"){
        thing.gameObject.SendMessage("TakeDamage",damage,SendMessageOptions.DontRequireReceiver);
        Destroy(gameObject);
    }
}

"EnemyStatus" (The one that controls the hit points)

var hitPoints : float = 10;

function Update () {
    if(hitPoints <= 0){
        DestroyObject(root);
    }
}

These scripts are untested, but I am positive they will work fine. Hope this gives you a better idea of how this works.

3

So what Meater6 was trying to say was to add a hit points system. I commented it and simplified it to make it less confusing.


var damage = 10; //this variable is the HP of the character.  
//0 = dead, 10 = full health.
//you can change this in the inspector.

function OnCollisionEnter (thing : Collision) {
       if(thing.gameObject.tag == "Enemy"){ 
              //"thing" is the collision entity, 
              //"gameObject" is the gameObject that collided with your rocket,
              // and "tag" is the tag of the gameObject that collided.  Google "Unity3d tag" if you don't know what tags are.
              //basically if the tag of the collided gameobject is "Enemy," then...

              //destroy the enemy thing
              Destroy(thing.gameObject);

              //and take away 1 damage.
              damage -= 1;
       }

}

function Update {
       if (damage == 0) {
              //Make damage not equal 0 so RocketDeath() doesn't happen twice
              damage = -1;
              RocketDeath();
       }
}

function RocketDeath() {
       //When the HP goes to 0, then do this.
}

Attach this to your rocket, by the way. Cheers!

4

heres what i would do, this is a health script add this to the object you want to take damage:

var curHealth : float = 100;
var maxHealth : float = 100;
var rocketDamage : float = 10;

function Update () {
    AddjustCurrentHealth(0);

}

function AddjustCurrentHealth(adj) {
    curHealth += adj;

    if(curHealth < 0)
        curHealth = 0;

    if (curHealth > maxHealth)
        curHealth = maxHealth;

    if(maxHealth < 1)
        maxHealth = 1;

    if(curHealth < 1) { //die
        Destroy(gameObject);
    }
}

function OnCollisionEnter(collision : Collider){
    if(collision.gameObject.tag == "Rocket"){
        curHealth -= rocketDamage;
    }
}

and add a tag Rocket to your rocket prefab.