FPS Bullets Generic Solution. How?

Questions & Answers
1

Im designing a game to learn… Im a hobbyist.

The game is very simple the screen will show you objects and you shoot it.

Thats been said.
What i need to achive is this.

1- FPS moves around (Solved using FPS script with its mouse controller script)
2- Add Cross-hair in the screen for aiming (Solved using the following code)
I added it to the FPS Camera

    var crosshairTexture : Texture2D;
    var position : Rect;
    static var OriginalOn = true;
     
    function Start()
    {
    position = Rect((Screen.width - crosshairTexture.width) / 2, (Screen.height -
    crosshairTexture.height) /3, crosshairTexture.width, crosshairTexture.height);
    }
     
    function OnGUI()
    {
    if(OriginalOn == true)
    {
    GUI.DrawTexture(position, crosshairTexture);
    }
    }

3- Bullets shoot i used the bellow script

var fireRate : float = 4.0;
private var nextFire : float = 0.0;
var prefabBullets:Transform;
var shootForce: float;
    function Start(){   
		}                          
    function Update () {
    
    	if (Input.GetMouseButtonDown(0) && IsOkToShoot()) {
    		Shoot(); //Shoot when conditions are met
    		var instanceBullet = Instantiate(prefabBullets, transform.position, Quaternion.identity);
    		instanceBullet.rigidbody.AddForce(transform.forward * shootForce);
    		Destroy (instanceBullet.gameObject, 2); 
    	}
    }
     
    function IsOkToShoot () : boolean {
    //Here we check that current time exceeds nextFire
    var itsOk : boolean = false;
    
	    if (Time.time>nextFire) {
	    	//Debug.Log(Time.time);
	    	nextFire = Time.time + fireRate;
	    	itsOk = true;
	    }
    return itsOk;
    }
     
    function Shoot () {
audio.Play();
    }

I have few questions…

1- How to make the bullets Always go at the Cross-hair ?
2- How to Get the objects name that the bullets hit ?

Any help it would be great thank you all…

2

Hello There,

Generally in FPS games, the bullets fired from your gun are not real 3d projectiles that hit your target, but rather just a graphical asset ,there are exceptions to this, but those involve a whole physics solution for the projectile, involving wind forces, for example.

In this case, I would recommend using the most usual solution. To achieve that, instead of instatiating a bullet prefab and adding force to it, simply cast a Raycast from your camera to check if you did hit something.

Unity’s docs on this : Original Docs

Here is a small example on achieving this:

  1. LayerMask : Create a Layer for all the objects that can be hit
  2. Camera.main.ScreenPointToRay() Will create a ray going for the FPS camera to the crosshair ( or you could just use the Input.mousePosition )
var hittableObjects : LayerMask;
var ray = Camera.main.ScreenPointToRay (crossHairPosition);
var hit : RaycastHit;
var range : float = 100;

if (Physics.Raycast (ray, hit, range, hittableObjects)) {
   // You have hit something
}

Hope it helps.

3

Hear is a simple code
But it still need alot of tweeking
Such as

-When object is clicked on a particulare animation of that object works…

  • Sound for shoot and for reload (I tried playing 2 sound but its just not working. I will check with Unity3d Answers.)
  • …etc

New Updated CODE
Please Comment on it for improvement…

#pragma strict
@script RequireComponent(AudioSource)
@script RequireComponent(AudioSource)
var animatedObject1 : GameObject;
var animatedObject2 : GameObject;

var Range : float = 50;
var Force : float = 400;

var fireRate : float = 2.0; //The rate of fire for the gun
private var nextFire : float = 0.0; //When the next fire is ok to shoot off

public var itsOk : boolean = true;

var audio1: AudioSource;
var audio2: AudioSource;


function Start(){
    var aSources = GetComponents(AudioSource);
    audio1 = aSources[0];
    audio2 = aSources[1]; 
}

function Update () {
		if (Input.GetButtonDown("Fire1") && itsOk && IsOkToShoot()){
			audio2.Play();
			ShootGun();
			itsOk = false;
		}

		if(Input.GetButtonDown("Fire2") && itsOk == false){
			ReloadLogic();
			itsOk = true;
		}
}
function  ReloadLogic() : boolean{
	var itsOk : boolean = false;
	PlayReloadAudio ();
	ReloadDelay();// This Does not seem to work therfore i used IsOkToShoot()
	itsOk = true;
			
	return itsOk;
}

function ReloadDelay(){

yield WaitForSeconds(1.5);

}

function ShootGun (){

	var Hit: RaycastHit;
	var DirectionRay = transform.TransformDirection(Vector3.forward);
	
	Debug.DrawRay(transform.position, DirectionRay * Range, Color.blue );
	
	if(Physics.Raycast(transform.position, DirectionRay, Hit, Range)){
	
		if(Hit.rigidbody){
			Hit.rigidbody.AddForceAtPosition(DirectionRay * Force, Hit.point);
			 
			 var distanceToGround = Hit.distance;
			 var HitName = Hit.transform.gameObject.name;
			 var HittedObjectName = Hit.transform.gameObject;
			 // Some Debuging
			 print(distanceToGround);
			 print(HitName);
			 print(animatedObject1.name); 
			 
			 if(animatedObject1.name == HitName){ 
			 	animatedObject1.animation.Play("die");

			 }else if(animatedObject2.name == HitName){
			 	animatedObject2.animation.Play("diehard"); 
 
			 }
			 
			 
			 Destroy(HittedObjectName, 5);
		}
	}
}

   function IsOkToShoot () : boolean {
    //Here we check that current time exceeds nextFire
    var itsOk : boolean = false;
    
	    if (Time.time>nextFire) {
	    	//Debug.Log(Time.time);
	    	nextFire = Time.time + fireRate;
	    	itsOk = true;
	    }
    return itsOk;
    }

function PlayShootAudio (){
	audio2.Play();
}
function PlayReloadAudio (){
audio1.Play();
}