Unity2D jumping in different height

Unity Engine
,
1

Hi guys, I was creating a code for a 2D platformer game and when I jump with the up arrow, the character would jump to various heights.

Even if the character is static, the jump height is different too.

Here is my code:

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

public class playerMovement : MonoBehaviour
{
public Rigidbody2D rb;
public float speed;
public float speed_x_constraint;
public float jumpForce;
private bool jumping;

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

speed_x_constraint = 5f;
jumpForce = 1f;
jumping = false;
speed = 0.1f;

}

void Update()
{
if (Input.GetKey(KeyCode.RightArrow))
{
rb.AddForce(new Vector2(100 * speed, 0f), ForceMode2D.Force);
}

if (Input.GetKey(KeyCode.LeftArrow))
{
rb.AddForce(new Vector2(-100 * speed, 0f), ForceMode2D.Force);
}

if (!jumping && Input.GetKey(KeyCode.UpArrow))
{
rb.AddForce(new Vector2(0f, jumpForce), ForceMode2D.Impulse);

}

if (rb.velocity.x > speed_x_constraint)
{
rb.velocity = new Vector2(speed_x_constraint, rb.velocity.y);
}

if (rb.velocity.x < -speed_x_constraint)
{
rb.velocity = new Vector2(-speed_x_constraint, rb.velocity.y);
}

}

void OnTriggerEnter2D(Collider2D collision)
{
if (collision.gameObject.tag == "Platform")
{
jumping = false;
}
}

void OnTriggerExit2D(Collider2D collision)
{
if (collision.gameObject.tag == "Platform")
{
jumping = true;
}
}
}
2

Try this.

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

public class playerMovement : MonoBehaviour {

    public Rigidbody2D rb;
    public float speed;
    public float speed_x_constraint;
    private bool jumping;

    // variables for random jump force
    public float jumpForceMin;
    public float jumpForceMax;

    void Start() {
        rb = gameObject.GetComponent<Rigidbody2D>();
        speed_x_constraint = 5f;
        jumping = false;
        speed = 0.1f;

        // set the minimum and maximum jump force values
        jumpForceMin = 1f;
        jumpForceMax = 2f;
    }

    void Update() {
        if (Input.GetKey(KeyCode.RightArrow)) {
            rb.AddForce(new Vector2(100 * speed, 0f), ForceMode2D.Force);
        }

        if (Input.GetKey(KeyCode.LeftArrow)) {
            rb.AddForce(new Vector2(-100 * speed, 0f), ForceMode2D.Force);
        }

        if (!jumping && Input.GetKey(KeyCode.UpArrow)) {
            // generate a random jump force value between the minimum and maximum values
            float jumpForce = Random.Range(jumpForceMin, jumpForceMax);
            rb.AddForce(new Vector2(0f, jumpForce), ForceMode2D.Impulse);
        }

        if (rb.velocity.x > speed_x_constraint) {
            rb.velocity = new Vector2(speed_x_constraint, rb.velocity.y);
        }

        if (rb.velocity.x < -speed_x_constraint) {
            rb.velocity = new Vector2(-speed_x_constraint, rb.velocity.y);
        }
    }

    void OnTriggerEnter2D(Collider2D collision) {
        if (collision.gameObject.tag == "Platform") {
            jumping = false;
        }
    }

    void OnTriggerExit2D(Collider2D collision) {
        if (collision.gameObject.tag == "Platform") {
            jumping = true;
        }
    }
}

This script adds two new variables jumpForceMin and jumpForceMax which define the minimum and maximum jump force values. When the player jumps by pressing the up arrow key, a random jump force is generated within the defined range and applied to the player. This way, the player can jump different heights randomly.