How to make Sphere to jump?

Questions & Answers
1

I don’t know, how to find out if a Phere is already in the air (we can jump only when we are on a ground, right?)

Thanks!!

I’m using this script to move along:

using UnityEngine;
using System.Collections;

public class BallMovement : MonoBehaviour {

    public float speed;

	// Use this for initialization
	void Start () {
	
	}
	
	// Update is called once per frame
	void FixedUpdate () {
       
        float moveHorizontal = Input.GetAxis("Horizontal");
        float moveVertical = Input.GetAxis("Vertical");

        Vector3 movement = new Vector3(moveHorizontal, 0.0f, moveVertical);

        rigidbody.AddForce(movement * speed * Time.deltaTime);
       
	}
}
2

I assume that your sphere has a collider? You can do a check for when it is on the ground with OnCollision commands. Try this. Unity - Scripting API: Collider.OnCollisionExit(Collision)

bool isGrounded = false;

void OnCollisionEnter(Collider other)
{
    if(other.gameObject.tag == "ground")
        isGrounded = true;
}

void OnCollisionExit(Collider other)
{
    if(other.gameObject.tag == "ground")
        isGrounded = false;
}

Also, nothing in your code seems to keep you from jumping while you are already in the air. Maybe something like this?

Vector3 movement = Vector3.zero;
void FixedUpdate () 
{
    float moveHorizontal = Input.GetAxis("Horizontal");
    float moveVertical = Input.GetAxis("Vertical");
 
    //Don't allocate new memory in FixedUpdate!!!!!
    movement.x = moveHorizontal;
    movement.z = moveVertical;

    if(isGrounded == true)
        rigidbody.AddForce(movement * speed * Time.deltaTime);
}
3

Here is my Solution:

using UnityEngine;
using System.Collections;

public class BallMovement : MonoBehaviour {

    public float speed;
    public float jumpSpeed;
    bool CanJump;
    bool jump;

	
	void Start () 
    {
        CanJump = true;
        jump = false;
	}

    void OnCollisionExit(Collision collisionInfo)
    {
        CanJump = false;
        jump = false;
    }

    void OnCollisionEnter(Collision collisionInfo)
    {
        CanJump = true;
    }

    void Update()
    { 
       if (Input.GetKeyDown(KeyCode.Space) && CanJump == true)
        {
           jump = true;
        }
    }

	
	void FixedUpdate () {
       
        float moveHorizontal = Input.GetAxis("Horizontal");
        float moveVertical = Input.GetAxis("Vertical");

        Vector3 movement = new Vector3(moveHorizontal, 0.0f, moveVertical);

        rigidbody.AddForce(movement * speed * Time.deltaTime);

        if (jump == true)
        {
            rigidbody.AddForce(Vector3.up * jumpSpeed);
        }
        
	}
 
}