Here's how I'm doing it in my game. I have two barriers that I define as game objects (wall1 and wall2). I count the 'grape' pickups that I've gotten so far, and I then tell the game to destroy wall1 and wall2 once the count reaches 3 and 6, respectively. You just have to tell the game what your "wall1" and "wall2" are in the inspector.
I also include a user interface element for counting the pickups and giving a 'win' message. Most of this is copied and pasted from Unity's RollABall tutorial.
using UnityEngine;
using UnityEngine.UI;
using System.Collections;
public class ExtraScript : MonoBehaviour {
public GameObject wall1;
public GameObject wall2;
public Text countText;
public Text winText;
private int count;
void Start()
{
count = 0;
SetCountText ();
winText.text = "";
}
void OnTriggerEnter(Collider other)
{
if (other.gameObject.CompareTag ("Grape"))
{
other.gameObject.SetActive(false);
count = count + 1;
SetCountText();
}
}
void Update()
{
if (count == 3)
{
Destroy(wall1);
}
if (count == 6)
{
Destroy(wall2);
}
}
void SetCountText ()
{
countText.text = "Count: " + count.ToString();
if (count >= 7)
{
winText.text = "You have won!";
}
}
}
End script
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