How to double jump

Questions & Answers
1

Hi, ive been scouring the internet left and right to put double jumps into my code,i’m making a 3D platformer, using a 3rd person controller and c#. I would like to know what additional script for the double jumping ill have to use and where abouts to include it.

Thanks. I’m quite new to this.

using UnityEngine;
using System.Collections;

public class PlayerController : MonoBehaviour {

public CharacterController controller;
public GameObject projectile;

Vector3 movementVector = Vector3.zero;
//movement variables
public float moveForce = 0;
public float moveDamping = 0.5f;
public float moveForceToAdd = 1f;
public float movementSpeed = 2f;

//jumping variables
public float jumpForce = 1.0f;
public float jumpDamping = 0.5f;
public float jumpForceToAdd = 100f;
int jumpCount = 1;

bool grounded = false;

// Use this for initialization
void Start () {
int result = 	AddNumber (2, 3);
	Debug.Log (result);
}

// Update is called once per frame
void Update () 
{
	if (Input.GetKeyDown (KeyCode.Q)) 
	{
		Instantiate (projectile, transform.position + transform.forward * 2, transform.rotation);
	}
	movementVector = new Vector3 (Input.GetAxis("Horizontal"), 0, Input.GetAxis("Vertical"));

	if (Input.GetAxis ("Vertical") != 0 || Input.GetAxis ("Horizontal") != 0) 
	{
		moveForce += moveForceToAdd;
	}

	if (Input.GetKeyDown (KeyCode.Space)) 
	{
		if (controller.isGrounded)
		{
			jumpForce += jumpForceToAdd;
		}
	}
	movementVector *= moveForce;
	movementVector += Physics.gravity;
	movementVector += new Vector3 (0, jumpForce, 0);
	gameObject.GetComponent<CharacterController>().Move (movementVector * Time.deltaTime);

	jumpForce *= jumpDamping;
	moveForce *= moveDamping;
}
int AddNumber (int a, int b)
{
	return a + b;
	}

}
`

2

private bool doubleJump = false;

if (Input.GetKeyDown (KeyCode.Space)) 
{
   if (controller.isGrounded)
   {
     doubleJump = true;
     jumpForce += jumpForceToAdd;
   }else if(doubleJump){
     doubleJump = false;
     jumpForce += jumpForceToAdd;
   }
}

Also, this video http://unity3d.com/learn/tutorials/modules/beginner/2d/2d-controllers has something about it.