Problem with a jump script

Hello,

I liked the Roll a ball tutorial you can find here : https://unity3d.com/fr/learn/tutorials/projects/roll-ball-tutorial

I wanted to work more on this project and decided to add levels, some effects...

And since yesterday, I want to add a jump script. So i found how to jump with tutorials. But the problem is I want the jump to consider the speed of the sphere. If i go fast, i'll jump further. The problem at the moment is : if I move fast, stop pressing the arrows (but the ball is still rolling) and press the jump key, it'll jump straight. If i keep pressing the arrow, it's like the speed will start from 0 (and not the speed i had when the ball was rolling). I did a video on YouTube to show you :

(first jump is when i stop pressing the arrows, second is when i'm still pressing them). What can I do ?

Here is my code (i kept everything in the code, even if it's not the jump script) :

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEngine.SceneManagement;
5.  
6. public class ControllingSphere : MonoBehaviour {
7.  
8.     public float speed;
9.     private int count = 0; // Number of cubes collected
10.     public int counttotal = 99; // Number of cubes in the scene
11.     public int goToSceneNumber = 99; // Go to this scene when all the cubes are collected
12.     public bool onGround; // Sphere grounded or not
13.     private Rigidbody rb;
14.  
15.  
16.     private void Start()
17.     {
18.         rb = GetComponent<Rigidbody>();
19.         onGround = true;
20.     }
21.  
22.  
23.  
24.     private void Update()
25.     {
26.         if (Input.GetKeyDown(KeyCode.R))
27.         {
28.             SceneManager.LoadScene(goToSceneNumber - 1); // Retry the level when R is pressed
29.         }
30.         if (onGround == true) // If the sphere is grounded
31.         {
32.            
33.             if (Input.GetKeyDown(KeyCode.Space)) // And if the player press Space
34.             {
35.                
36.                 rb.velocity = new Vector3(0f, 5f, 0f); // The sphere will jump
37.                 onGround = false; // The sphere can't jump if it's in the air
38.             }
39.  
40.         }
41.  
42.  
43.     }
44.  
45.  
46.     private void FixedUpdate()
47.     {
48.         float moveHorizontal = Input.GetAxis("Horizontal");
49.         float moveVertical = Input.GetAxis("Vertical");
50.  
51.         Vector3 movement = new Vector3(moveHorizontal, 0.0f, moveVertical);
52.  
53.         rb.AddForce(movement * speed);  // Controlling the character
54.  
55.     }
56.  
57.     private void OnCollisionEnter(Collision other)
58.     {
59.         if (other.gameObject.CompareTag("Ground")) // If the sphere is touching the floor (tagged Ground)
60.         {
61.             onGround = true; // The sphere can jump again
62.         }
63.     }
64.  
65.     void OnTriggerEnter(Collider other)
66.     {
67.  
68.         if (other.gameObject.CompareTag("Pickups")) // If the sphere collect a cube
69.         {
70.             other.gameObject.SetActive(false); // This cube is disabled
71.  
72.             count++;
73.         }
74.         else if (other.gameObject.CompareTag("Classical")) // If the sphere collect a classical cube
75.         {
76.             other.gameObject.SetActive(false); // This cube is disabled
77.             transform.localScale += new Vector3(0.1F, 0.1F, 0.1F); // Make the sphere bigger
78.  
79.             count++;
80.         }
81.         else if (other.gameObject.CompareTag("Smaller")) // If the sphere collect a smaller cube
82.         {
83.             other.gameObject.SetActive(false); // This cube is disabled
84.             transform.localScale += new Vector3(-0.1F, -0.1F, -0.1F); // Make the sphere smaller
85.             count++;
86.         }
87.         if (count == counttotal)
88.         {
89.             SceneManager.LoadScene(goToSceneNumber); //If the sphere collected all the cubes, we go to the next level
90.            
91.            
92.         }
93.     }
94. }

 

You're setting the velocity directly in your jump, which will override all other forces acting on the ball.

Try using AddRelativeForce() with just a Y component instead.

 

Thanks for your answer, so instead of :

Code (CSharp):

1. rb.velocity = new Vector3(0f, 5f, 0f);

I added :

Code (CSharp):

1. rb.AddRelativeForce(0f, 5f, 0f);

And that didn't work. That didn't even jump while i was rolling.

I also tried :
rb.AddRelativeForce = new Vector3(0f, 5f, 0f);

But that gave me an error.

Maybe i did something wrong ? Sorry I'm a beginner

 

EDIT: My mistake, you should be using AddForce not AddRelativeForce, as the ball will be rolling over on itself and we want to use world space.

Nothing wrong with being a beginner, you don't have to apologize. You're just not applying enough force to counteract gravity (-9.8 by default). Increase the force and try changing the force mode from the default force (which is continuous) to impulse, which has a more "front loaded" effect.

Code (csharp):

1.  
2. rb.AddForce(0f, 10f, 0f, ForceMode.Impulse);
3.  

That should get it hopping.

 

that's working ! Thanks a lot !