Giới thiệu đối tượng vật lý 2D, xử lý va chạm trong lập trình game với Unity3D

using UnityEngine;
using System.Collections;

public class BackGroundMove : MonoBehaviour {

    public float moveSpeed;
    public float moveRange;

    private Vector3 oldPosition;
    private GameObject obj;
	// Use this for initialization
	void Start () {
        obj = gameObject;
        oldPosition = obj.transform.position;
        moveSpeed = 5;
        moveRange = 20;
	}
	
	// Update is called once per frame
	void Update () {
        obj.transform.Translate(new Vector3(-1 * Time.deltaTime * moveSpeed, transform.position.y, 0));

        if (Vector3.Distance(oldPosition, obj.transform.position) > moveRange)
        {
            obj.transform.position = oldPosition;
        }
    }
}
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using UnityEngine;
using System.Collections;

public class BirController : MonoBehaviour {

    public float flyPower = 100;

    GameObject obj;
	// Use this for initialization
	void Start () {
        obj = gameObject;
	}
	
	// Update is called once per frame
	void Update () {
	    if (Input.GetMouseButton(0))
        {
            audioSource.Play();
            obj.GetComponent<Rigidbody2D>().AddForce(new Vector2(0, flyPower));
        }
	}

    void OnCollisionEnter2D(Collision2D other)
    {
        EndGame();
    }    

    void EndGame()
    {
        Debug.Log("End game");
    }
}
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using UnityEngine;
using System.Collections;

public class WallMove : MonoBehaviour {

    public float moveSpeed;
    public float minY;
    public float maxY;

    public float oldPosition;
    private GameObject obj;
    // Use this for initialization
    void Start()
    {
        obj = gameObject;
        oldPosition = 10;
        moveSpeed = 5;
        minY = -1;
        maxY = 1;
    }

    // Update is called once per frame
    void Update()
    {
        obj.transform.Translate(new Vector3(-1 * Time.deltaTime * moveSpeed, 0, 0));        
    }

    void OnTriggerEnter2D(Collider2D other)
    {
        if (other.gameObject.tag.Equals("ResetWall"))
            obj.transform.position = new Vector3(oldPosition, Random.Range(minY, maxY + 1), 0);
    }
}
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using UnityEngine;
using System.Collections;
using UnityEngine.SceneManagement;

public class GameController : MonoBehaviour {

	// Use this for initialization
	void Start () {
    }
	
	// Update is called once per frame
	void Update () {
	}

    public void EndGame()
    {
    }
}
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