FPS Bullets Generic Solution. How?

Question

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....

Answer 1

Best Answer

Answer by arosellisp · Jan 28, 2013 at 01:13 PM

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:

LayerMask : Create a Layer for all the objects that can be hit
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.

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NewGuy · Jan 28, 2013 at 08:33 PM 0

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Thanks arosellisp....

Thats changes everything...... :-( After reading for sometime i made solution with a help os a script was posted in the Unity3D Answers.

I need to tweak it then i will post it for improvement to the answer from the Community.....

arosellisp · Jan 29, 2013 at 01:06 AM 0

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I'm glad to hear it, hope it all works well. All in all, it should be easier to build using the raycast solution, ins$$anonymous$$d of making a bullet object that has to check it's collision and everything (since problems can arise with physics and everything).

Answer 2

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();
 }

FPS Bullets Generic Solution. How?

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