using UnityEngine;
using System.Collections;

public class MyPlayerShoot : MonoBehaviour {
  public GameObject bulletPrefab;
  public float bulletSpeed = 30;
  public float shootPause = 1;
  private float timeLastShoot = 0;
  public float shootRadius = 10;
  private Transform mobTransform;

  // Use this for initialization
  void Start () {

  }
   
  // Update is called once per frame
  void Update () {
   if (Input.GetMouseButtonDown (1)) {
    lookTarget();
    float distance = Vector3.Distance (transform.position, mobTransform.position);
    if(distance> shootRadius){
     Debug.Log("Моб слишком далеко");
    }else{
     if(Time.time> timeLastShoot + shootPause){
      GameObject newBullet = (GameObject) Instantiate(bulletPrefab, transform.position + transform.forward,
                    Quaternion.identity);
      Rigidbody newBulletRigidbody = newBullet.GetComponent<Rigidbody>();
      mobTransform = newBullet.GetComponent<Transform>();
      Vector3 shoot = mobTransform.position - transform.position;//по статье на хабре  надо отнимать от позишина цели позишн патрона, но я пробовал менять местами
      //толку всеравно нет..
      Vector3 shootNormal = shoot.normalized;
      newBulletRigidbody.AddForce(shootNormal * bulletSpeed, ForceMode.VelocityChange);
      timeLastShoot = Time.time;
     }
    }
   }
  }
  void lookTarget(){
   GameObject[] mobs = GameObject.FindGameObjectsWithTag ("Mob");
   if (mobs != null) {
    foreach (GameObject mob in mobs) {
     mobTransform = mob.transform;    
    }
   }
   else {
    Debug.Log("Нет доступных мобов");
   }
  }
}

using System.Collections.Generic;

public class MyPlayerShoot : MonoBehaviour {
  public GameObject bulletPrefab;
  public float bulletSpeed = 30;
  public float shootPause = 1;
  private float timeLastShoot = 0;
  public float shootRadius = 10;
  private GameObject currentTarget;
  // Use this for initialization
  void Start () {
  }
   
  // Update is called once per frame
  void Update () {
   if (Input.GetMouseButtonDown (1)) {
    currentTarget = findTargets();
    float distance = Vector3.Distance (transform.position, currentTarget.transform.position);
    if(distance> shootRadius){
     Debug.Log("��� ������� ������");
    }else{
     if(Time.time> timeLastShoot + shootPause){
      GameObject newBullet = (GameObject) Instantiate(bulletPrefab, transform.position + transform.forward,
                    Quaternion.identity);
      Rigidbody newBulletRigidbody = newBullet.GetComponent<Rigidbody>();
      Vector3 shootWay = currentTarget.transform.position - transform.position;
      Vector3 shootWayNorm = shootWay.normalized;
      newBulletRigidbody.AddForce(shootWayNorm*Time.deltaTime*bulletSpeed, ForceMode.Force);
      timeLastShoot = Time.time;

     }
    }
   }
  }
  public GameObject findTargets(){
   float closestMobDistance = 0;//���������� ��� �������� ��������� �� ����
   GameObject nearestMob = null;//���������� ��� ���������� ����
   List<GameObject> allMobs = GameObject.FindGameObjectsWithTag ("Mob").ToList ();//��� ����� �� ���� � �������� � ������
   foreach (GameObject mob in allMobs) {//��������� �����
    if((Vector3.Distance(mob.transform.position, transform.position)<
        closestMobDistance) || closestMobDistance == 0){
     closestMobDistance = Vector3.Distance(mob.transform.position, transform.position);//����� ��������� � ������� � ����������
     nearestMob = mob;//������������ ��� ���������
    }
   }
   Debug.Log(" ��������� ���----> " + nearestMob);
   return nearestMob;//��������� ���������� ����

  }
}