1

Hey there!
So I am adding some player-controls to my player in my game.
However, even though I got my doublejump working, I still find two flaws with it. (My aim is to make an super smash kind of game)

If you double tap the jump button you fly ridiculously further up than intended.
To fix this problem, I tried to put in a delay of 0.5-1 sec after the jump from the ground, but did not manage to make that work in my script. Also open for other solutions than delay.

When falling down and pressing the jump button, you will not jump much at all, but merely just stop the falling to start falling again.
I though I could add some more force on the second jump, but that feels like I am making things too clunky, so maybe there is some way to remove the gravity on the object for a split second, and executing the jump directly afterwards.

PlayerController Script (C#):

public class PlayerController : MonoBehaviour {

	public float maxSpeed = 10f;
	bool facingRight = true;

	Animator anim;

	bool grounded = false;
	public Transform groundCheck;
	float groundRadius = 0.2f;
	public LayerMask whatIsGround;
	public float jumpForce = 700;

	bool doubleJump = false;

	// Use this for initialization
	void Start () {
		anim = GetComponent<Animator> ();
	}
	
	// Update is called once per frame
	void FixedUpdate () {

		grounded = Physics2D.OverlapCircle (groundCheck.position, groundRadius, whatIsGround);
		anim.SetBool ("Ground", grounded);

		anim.SetFloat("vSpeed", GetComponent<Rigidbody2D>().velocity.y);

		if (grounded) {
			doubleJump = false;
		}

		float move = Input.GetAxis ("Horizontal");

		anim.SetFloat ("Speed", Mathf.Abs (move));

		GetComponent<Rigidbody2D>().velocity = new Vector2(move * maxSpeed, GetComponent<Rigidbody2D>().velocity.y);

		if (move > 0 && !facingRight){
			Flip ();
		}
		else if (move < 0 && facingRight) {
			Flip ();
		}
	}

	void Update(){
		if ((grounded || !doubleJump) && Input.GetKeyDown (KeyCode.W) || Input.GetKeyDown (KeyCode.UpArrow) || Input.GetKeyDown (KeyCode.Space)) {
			anim.SetBool("Ground", false);
			GetComponent<Rigidbody2D>().AddForce(new Vector2(0, jumpForce));

			if(!doubleJump && !grounded){
					doubleJump = true;
			}
		}
	}

	void Flip () {
		facingRight = !facingRight;
		Vector3 theScale = transform.localScale;
		theScale.x *= -1;
		transform.localScale = theScale;
	}
}
2

I’m positive it’s because AddForce is adding to the velocity that your rigidbody is already experiencing. So, if you’re falling -9.8m/s and you jump with a force of 10, you’ll go up hardly any; just enough to combat the velocity you’re already going. Same with if you’re already jumping. If you’re mid jump (and still climbing), clicking will apply to the velocity you’re already going up.

I think a simple fix would be to cut the velocity off right before you apply the force. Therefore, you’re not moving, and you’ll apply exactly the force needed, regardless of where you’re already going. Something like this:

float xVelocity = GetComponent<Rigidbody>().velocity.x;

GetComponent<Rigidbody2D>().velocity = new Vector2(x, 0);
GetComponent<Rigidbody2D>().AddForce(new vector2(0, jumpForce));

You could also try messing with ForceMode2D. I don’t remember if it includes Impulse or not.
In the snippet I posted, the x velocity essentially remains the same, therefore, you don’t go straight up. If you’re jumping while running, you will still have that momentum of going forwards/backwards.

Let me know if this works for you, or if you have problems/questions.