[Part 1] Unable to jump

[Yusuke Hanayama]

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I did everything exactly like in the first video of the tutorial series. Unfortunately, my character can´t jump and I just get the message “The field ‘PlayerController.jumpForce’ is set, but its value is never used. I linked my code here:

[Terence]

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Yusuke, you’ll need to post your code in text here. We can’t see the image you posted.

[Yusuke Hanayama]

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Oh sorry I’m pretty new to this. Anyways, heres my code:

<code>using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlayerController : MonoBehaviour
{
    [Header("Horizontal Movement Settings")]
    private Rigidbody2D rb;

    [SerializeField] private float walkspeed = 10;

    private float xAxis;

    private float jumpForce = 10;

    // Start is called before the first frame update
    void Start()
    {
        rb = GetComponent<Rigidbody2D>();
    }

    // Update is called once per frame
    void Update()
    {
       GetInputs(); 
       Move();
    }

    void GetInputs()
    {
        xAxis = Input.GetAxisRaw("Horizontal");
    }

    private void Move()
    {
       rb.velocity = new Vector2(walkspeed * xAxis, rb.velocity.y);
    }

    }</code>

[Chloe Lim]

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Hi, you need to add Jump() to your Update function I dont see the script you sent having the jump function, if the problem still persist, do send it here as well and we could further check what could be causing the issue

• Terence

has upvoted this post.

[Yusuke Hanayama]

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Ok i’ll try it out! Thanks for the advice!

[A_DONUT]

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It looks like the issue is that you have defined a jumpForce variable but haven’t implemented any jump functionality. Let’s add the necessary logic to handle jumping:

---

Steps to Add Jumping Functionality:

1. Capture Jump Input:
   Add a check to detect when the player presses the jump button (typically the spacebar).

2. Apply Vertical Force:
   Use rb.AddForce() or set the rb.velocity to create an upward motion.

3. Ground Detection:
   Ensure the player can only jump when they are on the ground to avoid infinite jumping (optional but recommended).

---

Updated Code:

csharp
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlayerController : MonoBehaviour
{
    [Header("Horizontal Movement Settings")]
    private Rigidbody2D rb;

    [SerializeField] private float walkSpeed = 10f;
    [SerializeField] private float jumpForce = 10f;  // Ensure jumpForce is serialized if you want to edit it in the Inspector

    private float xAxis;
    private bool isGrounded;  // To check if the player is on the ground

    [SerializeField] private Transform groundCheck;  // Assign a ground check point in the Inspector
    [SerializeField] private LayerMask groundLayer;  // Assign the ground layer in the Inspector

    void Start()
    {
        rb = GetComponent<Rigidbody2D>();
    }

    void Update()
    {
        GetInputs();
        Move();
        Jump();  // Add the Jump function to the Update loop
    }

    void GetInputs()
    {
        xAxis = Input.GetAxisRaw("Horizontal");
    }

    private void Move()
    {
        rb.velocity = new Vector2(walkSpeed * xAxis, rb.velocity.y);
    }

    private void Jump()
    {
        // Check if the player is grounded before allowing them to jump
        isGrounded = Physics2D.OverlapCircle(groundCheck.position, 0.1f, groundLayer);

        if (Input.GetButtonDown("Jump") && isGrounded)
        {
            rb.velocity = new Vector2(rb.velocity.x, jumpForce);  // Apply upward velocity
        }
    }
}
<code></code>

---

Important Points:

1. Ground Detection:

   • groundCheck: Create an empty GameObject (child of the player) and position it at the player’s feet. Assign this to the groundCheck field in the Inspector.
   • groundLayer: Assign the ground layer to check for collisions with the ground (usually Default or a custom Ground layer).

2. Jump Input:
   By default, Unity’s “Jump” input is mapped to the spacebar. Ensure this is configured in the Input Manager:

   • Go to Edit > Project Settings > Input Manager.
   • Ensure Jump is listed with Key: Space.

3. Jump Force Warning:
   The warning “value never used” should disappear after you call jumpForce in the Jump() method.

---

Optional Enhancements:

• Double Jump: Implement logic to allow a second jump while in the air.
• Animation Integration: Trigger jump animations when jumping or falling.
• Coyote Time: Add a short grace period where the player can jump even if they’ve just left the ground.

---

Let me know if you need help i am personal assistant of Terresqual!

[Author]

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