Hello everyone, I’m making a Pong clone right now and atm I am trying to make the score. Whats supposed to happen is that when you hit the right or left wall you score a point. But this error keeps popping up:
NullReferenceException: Object reference not set to an instance of an object
Ball.OnTriggerEnter2D (UnityEngine.Collider2D other) (at Assets/Scripts/Ball.cs:53)
I’m using 2 scripts, here’s the first one:
using UnityEngine;
using System.Collections;
public class Ball : MonoBehaviour {
public float speed = 30;
public GameManager gm;
void Start ()
{
GetComponent<Rigidbody2D> ().velocity = Vector2.right * speed;
GameObject g = GameObject.Find ("GM");
GameManager gm = g.GetComponent<GameManager> ();
}
void OnCollisionEnter2D (Collision2D col)
{
if(col.gameObject.name == "RacketLeft")
{
float y = hitFactor(transform.position, col.transform.position, col.collider.bounds.size.y);
Vector2 dir = new Vector2 (1, y).normalized;
GetComponent<Rigidbody2D>().velocity = dir * speed;
}
if (col.gameObject.name == "RacketRight")
{
float y = hitFactor(transform.position, col.transform.position, col.collider.bounds.size.y);
Vector2 dir = new Vector2 (-1, y).normalized;
GetComponent<Rigidbody2D>().velocity = dir * speed;
}
}
float hitFactor(Vector2 ballPos, Vector2 racketPos, float racketHeight)
{
return(ballPos.y - racketPos.y) / racketHeight;
}
void OnTriggerEnter2D (Collider2D other)
{
if(other.gameObject.CompareTag("WallR"))
{
gm.countL += 1;
gm.SetCountText();
}
if(other.gameObject.CompareTag("WallL"))
{
gm.countR += 1;
gm.SetCountText();
}
}
}
Here’s the second one:
using UnityEngine;
using UnityEngine.UI;
using System.Collections;
public class GameManager : MonoBehaviour {
public Text rScore;
public Text lScore;
//public Text roundWinner;
/*
public GameObject ball;
public GameObject ballSpawn;
*/
public int countR;
public int countL;
void Start ()
{
countR = 0;
countL = 0;
//roundWinner.text = "";
SetCountText ();
}
public void SetCountText()
{
rScore.text = "" + countR.ToString ();
lScore.text = "" + countL.ToString ();
}
/*
void SetCountTextL ()
{
}
*/
}
Thanks in advance 