Make scene restart after ball falls off. (beginner)

Questions & Answers
1

I am new to unity so I apologize if I am just making you do work I can’t figure out how to do.
I have a basic game were a ball rolls on a track until the end of the level.
How can I make it that when the ball falls off then the scene restarts.
My script for the ball is below:

using UnityEngine;
using UnityEngine.UI;
using System.Collections;

public class PlayerController : MonoBehaviour {

public float speed;
public Text countText;
public Text winText;

private Rigidbody rb;
private int count;

void Start ()
{
	rb = GetComponent<Rigidbody>();
	count = 0;
	SetCountText ();
	winText.text = "";
}

void FixedUpdate ()
{
	float moveHorizontal = Input.GetAxis ("Horizontal");
	float moveVertical = Input.GetAxis ("Vertical");

	Vector3 movement = new Vector3 (moveHorizontal, 0.0f, moveVertical);

	rb.AddForce (movement * speed);
}

void OnTriggerEnter(Collider other) 
{
	if (other.gameObject.CompareTag ( "Pick Up"))
	{
		other.gameObject.SetActive (false);
		count = count + 1;
		SetCountText ();
	}
}

void SetCountText ()
{
	countText.text = "Score: " + count.ToString ();
	if (count >= 2)
	{
		winText.text = "You Win!";
	}
}

}

2

What I’d do is have something like this in Update:

if (transform.position.y < -10f)
    Application.LoadScene(insertSceneNameHere)

This loads the scene when the ball’s y position drops below -10. Of course, you can use a different value that better suits your needs, but the idea is simple.

Note that if you’re using Unity 5, you’d best use SceneManager.LoadScene instead of Application.LoadScene.

3

As Tespy suggested try adding the code he showed to the end of FixedUpdate(). Also if you are using a Unity version less than 5, it would be Application.LoadLevel() not Application.LoadScene().