Object Pooling Unity 2D Tutorial | Unity Tutorial
In this Unity 2D tutorial, learn how to implement object pooling to optimize your game’s performance. We'll guide you through creating and managing a pool of reusable objects, such as bullets, to avoid the overhead of frequent instantiation and destruction. By the end, you'll understand how to set up efficient shooting mechanics and enhance your game's efficiency. Perfect for improving performance and mastering game development basics!
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Scripts:
Bullet.cs
using UnityEngine;
public class Bullet : MonoBehaviour
{
public float lifetime = 2f; // Time before the bullet is deactivated
void OnEnable()
{
Invoke("Deactivate", lifetime);
}
void OnDisable()
{
CancelInvoke(); // Cancel the deactivation if the bullet is returned to the pool before the lifetime expires
}
void Deactivate()
{
// Return the bullet to the pool
ObjectPool pool = FindObjectOfType<ObjectPool>(); // Make sure this works for your setup
if (pool != null)
{
pool.ReturnObject(gameObject);
}
}
}
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ObjectPool.cs
using System.Collections.Generic;
using UnityEngine;
public class ObjectPool : MonoBehaviour
{
public GameObject prefab; // The prefab to pool
public int poolSize = 10; // Number of objects in the pool
private Queue<GameObject> pool;
void Awake()
{
pool = new Queue<GameObject>();
for (int i = 0; i < poolSize; i++)
{
GameObject obj = Instantiate(prefab);
obj.SetActive(false);
pool.Enqueue(obj);
}
}
public GameObject GetObject()
{
if (pool.Count > 0)
{
GameObject obj = pool.Dequeue();
obj.SetActive(true);
return obj;
}
else
{
// Optionally: create new objects if pool is empty
GameObject obj = Instantiate(prefab);
return obj;
}
}
public void ReturnObject(GameObject obj)
{
obj.SetActive(false);
pool.Enqueue(obj);
}
}
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BulletShooter.cs
using UnityEngine;
public class BulletShooter : MonoBehaviour
{
public ObjectPool bulletPool; // Assign in Inspector
public Transform firePoint; // The point from where bullets are fired
public float bulletSpeed = 10f; // Speed of the bullets
public KeyCode shootKey = KeyCode.Space; // Key to shoot
public float fireRate = 0.1f; // Time between shots
private float nextFireTime = 0f;
void Update()
{
if (Input.GetKey(shootKey) && Time.time >= nextFireTime)
{
Shoot();
nextFireTime = Time.time + fireRate;
}
}
void Shoot()
{
GameObject bullet = bulletPool.GetObject();
bullet.transform.position = firePoint.position;
bullet.transform.rotation = firePoint.rotation;
Rigidbody2D rb = bullet.GetComponent<Rigidbody2D>();
if (rb != null)
{
rb.velocity = firePoint.right * bulletSpeed; // Ensure this aligns with your desired direction
}
}
}
