simple jump

Scripting
1

Hi guys, i try to code a simple jump on a cube, but with this code, it have 2 jump…

can you help me to retake this code for a simple jump please?

using UnityEngine;
using System.Collections;

[RequireComponent(typeof(Rigidbody))]
public class Jump : MonoBehaviour
{

public Vector3 jump;
public float jumpForce = 2.0f;

public bool isGrounded;
Rigidbody rb;
void Start()
{
rb = GetComponent();
jump = new Vector3(0.0f, 2.0f, 0.0f);
}

void OnCollisionStay()
{
isGrounded = true;
}

void Update()
{
if (Input.GetKeyDown(KeyCode.Space) && isGrounded)
{

rb.AddForce(jump * jumpForce, ForceMode.Impulse);
isGrounded = false;
}
}
}

2

@zakilex , I think that your code is good, I created a sample project with a plane and a cube. Mesh collider on the plan, box collider, rigidbody and Jump component on the cube and got just one jump. Could you be getting a key bounce on your spacebar?

3

if you tap spacebar several time what append? only one jump?

4

it don’t work for me, there is multiple jumps…someone can help me?

5

Format your code please.

6

First: Apply your force in FixedUpdate, not Update.

Second: Set isGrounded to true in OnCollisionEnter() instead of OnCollisionStay() so your flag isn’t reset in between the physics engine update and your jump impulse.

1 Like
7

Hey,
Here you go This should work for you!!

One tip: If you want to show a code go to that little board type of thingy where it say insert and then click code.
It will give a much cleaner look to this thread.

Hope i was Usefull!

using UnityEngine;

[RequireComponent(typeof(Rigidbody))]
public class Jump : MonoBehaviour{

    public KeyCode jump;             //Which key need there be pressed (Change this in the Inspector)
    public float JumpHeight =5;      //JumpHeight
    public bool isGrounded;         

    Rigidbody rb;


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

    void Update()
    {
        if (Input.GetKeyDown(jump))                                   //if you press the key
        {
            if (isGrounded == true)                                   //Check if you are on the ground if not it won't Do the commend bellow.
            {
                rb.velocity = new Vector3(0, JumpHeight, 0);          //Add Jump height
            }
        }
    }

    //-------------------------------------------------------------------
    //Check if Object IsGrounded
    void OnCollisionExit(Collision collisionInfo)                     //if you are not on the ground but in the air
    {
        isGrounded = false;
    }

    void OnCollisionEnter(Collision collisionInfo)                    //Wen you hit somthing
    {
        isGrounded = true;
    }

}