Why this program can not to auto die player

Questions & Answers
1

using UnityEngine;
using System.Collections;

namespace StateMachineSample
{
public class PlayerController : MonoBehaviour
{
public Transform turret;
public Transform muzzle;
public GameObject bulletPrefab;

    private int maxLife = 3;
    private int life;

    private float force = 100f;
    private float maxSpeed = 30f;
    private float maxAngularVelocity = 360f;
    private float attackInterval = 0.8f;

    private int groundLayerMask;
    private float lastAttackTime;

    private void Start()
    {
        groundLayerMask = 1 << LayerMask.NameToLayer("Ground");
    }

    private void Update()
    {
        UpdateTank();
        UpdateTurret();
    }

    

    private void UpdateTank()
    {
        Vector3 velocity = GetComponent<Rigidbody>().velocity;

        life = maxLife;

        if (velocity.sqrMagnitude < 1f)
        {
            return;
        }

        Vector3 direction = new Vector3(velocity.x, 0f, velocity.z);

        Quaternion targetRotation = Quaternion.LookRotation(direction);
        transform.rotation = Quaternion.RotateTowards(transform.rotation, targetRotation, maxAngularVelocity * Time.deltaTime);
    }

    public void TakeDamage()
    {
        life--;
        if (life <= 0)
        {
            Destroy(gameObject);
        }
    }

    private void UpdateTurret()
    {

        life--;
        if (life <= 0)
        {
            Destroy(gameObject);
        }

        // マウス位置を狙う
        Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
        RaycastHit hit;
        if (Physics.Raycast(ray, out hit, Mathf.Infinity, groundLayerMask))
        {
            turret.rotation = Quaternion.LookRotation(hit.point - turret.position);
        }

        
        

        // マウス左クリックで発射する
        if (Input.GetMouseButtonDown(0))
        {
            if (Time.time > lastAttackTime + attackInterval)
            {
                Instantiate(bulletPrefab, muzzle.position, muzzle.rotation);
                lastAttackTime = Time.time;
            }
        }
    }

    private void FixedUpdate()
    {
        float x = Input.GetAxisRaw("Horizontal");
        float z = Input.GetAxisRaw("Vertical");

        Vector3 direction = new Vector3(x, 0f, z).normalized;

        GetComponent<Rigidbody>().AddForce(direction * force);
        GetComponent<Rigidbody>().velocity = Vector3.ClampMagnitude(GetComponent<Rigidbody>().velocity, maxSpeed);
    }
}

}

I want to make game of tank but I can not auto die player
Ex. if three “Bullet” clash to the player, player was dead
Where is wrong?

2

At the beginning of UpdateTank method, you assign maxLife to life. UpdateTank is called from Update. Thus, every frame the life of the tank is set up to maxLife. Thus, it always keeps the same value. You should assign maxLife to life only once at the beginning of the game. For example, in Start or in Awake.

3

I see
I will try