Shoot at Centre

Hi .
So i made a shooting script, and i have 2 problems, hope someone can help first is :
When i shoot my Projectile it doesn't go to the crosshair. How can i make projectile go to crosshair.
And second when my weapon goes trough wall and i shoot the projectiles go trough wall how can i make projectiles destroy when weapon is going trough wall?

I don't understand raycast so i don't know how to use it.
Here's my shooting script

Code (csharp):

1. //Shooting
2. var BulletPrefab:Transform;
3. var force : float = 2000;
4. public var guiSkin : GUISkin;
5.  
6. //Rifle
7. var ammo : int = 100;
8. var FireRate = 0.1;
9. var Rifle = true;
10. var CanFire : boolean;
11.  
12. //Recoil
13.  
14. var crosshair : Texture2D;
15.  
16.  
17.  
18. function OnGUI () {
19.  
20. GUI.skin = guiSkin;
21.    
22. GUI.Label (Rect (100, 620, 100, 100),"Ammo :" + ammo);
23.  
24. GUI.Label(Rect(Screen.width/2 -25 ,Screen.height/2 -25 ,100,50), crosshair);
25.  
26. }
27.  
28. function Update()
29. {
30.  
31. if(Input.GetButtonUp("Fire1"))
32. {
33. CanFire = true;
34. }
35.  
36.  
37.  
38.  
39. if (Rifle == false )
40. {
41.  
42. if(Input.GetButtonDown("Fire1"))
43.     {  
44.     if (ammo >0)
45.         {
46.            
47.             Fire();
48.         }
49.     }
50. }
51. else {
52. if(Input.GetButton("Fire1"))
53. {
54.  
55.  
56.  
57.     if (ammo >0)
58. {
59.    
60.     Fire();
61. }
62. }
63.         }
64.  
65.     }
66.  
67.  
68. function Fire ()
69. {
70.  
71.  
72.  
73. if(CanFire == true)
74. {
75.  
76.     var bullet = Instantiate(BulletPrefab, GameObject.Find("spawnPoint").transform.position, GameObject.Find("Obj").transform.rotation);
77.     bullet.rigidbody.AddForce(bullet.transform.forward * force);
78.     CanFire = false;
79.         yield WaitForSeconds (FireRate);
80.     CanFire  = true;
81.    
82.     ammo -= 1;
83.    
84.    
85.    
86. }
87.  
88. }
89.  

I've searched a lot . But It's all raycast and i don't know how to use raycast.
I'm sorry if i made any typing mistakes i'm so tired.

Thanx for help.

 

Bump ?

 

Bump.

 

Raycast is easy to understand if you just try to use it.

Basically, it's just an easy way to look if there is anything to collide with along a line.

To quote your signature: Just believe in yourself and your abilities. You never know what you can do.

 

think of raycast as a red dot laser sight for the unity engine...
(I think it's more complicated to actually put a red dot laser sight into a FPS, it's just an analogy )

you tell it where to start (i.e. the camera), which direction to go (i.e. camera rotation), how far to go (i.e. range/a very long way), and it tells you what it ran into.

You can then have your gun rotate towards the point so when you fire a projectile it'll be aimed at that point.

 

Ty , it's more clear to me now .