var damage : int = 10; // тут урон

hit.collider.SendMessage("Damage", damage, SendMessageOptions.DontRequireReceiver);

hit.collider.gameObject.GetComponent(твойСкриптЮнитаГдеЕгоХП).hp-=damage;

  for (var i = 0; i < cM; ++i)   
    {
     for (var i2 = 0; i2 < cM; ++i2)   
     {
      charRand[i]=Random.Range(0,8);
      if(i!=i2 && charRand[i]==charRand[i2])
      {
       charRand[i2]=Random.Range(0,8);
      }
     }
    }

using UnityEngine;
using System.Collections;

public class Shot : MonoBehaviour {
public Transform camera1;
private RaycastHit Hit;
public Transform dirt;
public Transform box;
public Transform boxSpark;   
public Transform blood;
public Transform bloodSpark;
public Transform dirtSpark;
public Transform GlassSpark;  
public Transform Glass;   
public int BulletTime = 1;
public AudioClip Fire;
public AudioClip Reload;
public int CurAmmo = 10;
public int MaxAmmo = 10;
public int CurClip = 10;
public int MaxClip = 10;
public int AmmoBoxWidth = 200;   
public int AmmoBoxHeight = 100;
public float damage = 0.5f;
public Texture2D crossHairTexture;
private Rect crossHairPosition;
public Animation anim;
public GUISkin MySkin;
public bool wp1;
public bool wp2;  
// Use this for initialization   
void Start () {  
crossHairPosition = new Rect((Screen.width - crossHairTexture.width)/2,(Screen.height - crossHairTexture.height)/2,crossHairTexture.width, crossHairTexture.height);  
}  
// Update is called once per frame
void Update () {  
if(Input.GetKeyDown(KeyCode.R)&CurAmmo<10&CurClip>=0){
audio.PlayOneShot(Reload);
CurClip -=1;
CurAmmo = MaxAmmo;
}   
if(Input.GetMouseButtonUp(0)& CurAmmo>=0){  
anim.Play();    
CurAmmo -= 1;   
audio.PlayOneShot(Fire);   
Vector3 Direction = camera1.TransformDirection(Vector3.forward);   
if(Physics.Raycast(camera1.position, Direction, out Hit,10000f)){
Quaternion HitRotation = Quaternion.FromToRotation(Vector3.up, Hit.normal);    
if(Hit.transform.rigidbody){
Hit.transform.rigidbody.AddForceAtPosition(Direction*200,Hit.point);
//Dirt
if(Hit.collider.name == "Dirt"){
Hit.transform.GetComponent<Damage>().CurHealth -=Random.Range(5,10);       
Transform dirtGO = Instantiate(dirt,Hit.point +(Hit.normal * 0.001f),HitRotation) as  Transform;                              
dirtGO.parent = Hit.transform;
Instantiate(dirtSpark,Hit.point +(Hit.normal * 0.001f),HitRotation);      
}
//Box      
if(Hit.collider.name == "Box"){      
Hit.transform.GetComponent<Damage>().CurHealth -=Random.Range(5,10);       
Transform dirtGO = Instantiate(dirt,Hit.point +(Hit.normal * 0.001f),HitRotation) as  Transform;                              
dirtGO.parent = Hit.transform;
Instantiate(dirtSpark,Hit.point +(Hit.normal * 0.001f),HitRotation);       
}      
//Blood
if(Hit.collider.name == "Enemy"){       
GameObject.FindWithTag("Enemy").GetComponent<Xp2>().HP -=Random.Range(5,10);     
Transform bloodGO = Instantiate(blood,Hit.point +(Hit.normal * 0.001f),HitRotation) as  Transform;                              
bloodGO.parent = Hit.transform;
Instantiate(bloodSpark,Hit.point +(Hit.normal * 0.001f),HitRotation);       
}  
if(Hit.collider.name == "Glass"){
Hit.transform.GetComponent<Damage>().CurHealth -=Random.Range(5,10);       
Transform GlassGO = Instantiate(dirt,Hit.point +(Hit.normal * 0.001f),HitRotation) as  Transform;                              
GlassGO.parent = Hit.transform;
Instantiate(GlassSpark,Hit.point +(Hit.normal * 0.001f),HitRotation);      
}       
}
}
}
}  
void OnGUI(){
GUI.skin = MySkin;  
GUI.Label(new Rect(Screen.width-AmmoBoxWidth,600,AmmoBoxWidth,AmmoBoxHeight),"Ammo:"+CurClip+"/"+MaxClip);
GUI.Box(new Rect(Screen.width-AmmoBoxWidth,600,AmmoBoxWidth,AmmoBoxHeight), "Ammo:"+CurAmmo+"/"+MaxAmmo);   
GUI.DrawTexture(crossHairPosition, crossHairTexture);   
}

function Damage (damage : int) {
     health -= damage;
}