How to make jump system in unity?-CodePudding

Here is my code for moving around in Uunity, however I can't seem to make the character jump. The moving camera and collect item on collision has also been implemented, now I just need to find out how to jump?

Why is it asking me for more details?

using TMPro;
using UnityEngine;
using UnityEngine.InputSystem;

public class DemoComponent : MonoBehaviour
{
    private Vector3 vectorToMove = new(1f, 0.5f, 1.5f);
    private Vector3 movementInput = Vector3.zero;

    private readonly float moveSpeed = 0.2f;
    private readonly float rotationSpeed = 0.05f;
    private readonly Vector3 rotationInput = Vector3.zero;
    public TextMeshProUGUI displayText;

    // Update is called once per frame
    private void Update()
    {
        var movementVector = transform.forward;
        movementVector *= movementInput.y;
        movementVector  = transform.right * movementInput.x;

        //transform.position  = movementVector * moveSpeed;
        GetComponent<Rigidbody>().MovePosition(transform.position   movementVector * moveSpeed);
        transform.rotation = Quaternion.Euler(transform.rotation.eulerAngles   rotationInput * rotationSpeed);
    }

    private void OnMove(InputValue value)
    {
        //Debug.Log(value.Get<Vector2>());
        movementInput = value.Get<Vector2>();
    }
}

CodePudding user response：

First you need to save the rigidbody instance to increase performance as well as access it:

private Rigidbody rb; // define rigidbody holder

private void Start()
{
    rb = GetComponent<Rigidbody>(); save instance on rb
}

This code is a simple jump with adjustable power. In most cases with `mass = 1`, a `jumpPower` of 300 is sufficient.

public float jumpPower = 300f;
private void Jump(float jumpPower) => rb.AddForce(Vector3.up * jumpPower);

Finally, by pressing the Space key, the jump method is executed.

private void Update()
{ 
    // some codes....

    if (Input.GetKeyDown(KeyCode.Space)) Jump(jumpPower);
}

CodePudding user response：

The jump is written entirely in accordance with the idea of moving in the direction, and it is found that the object moves to the control in an instant.

    void Update() {
        if (Input.GetKeyDown(KeyCode.Space)) {
       // If you don't add Space.World, if the object rotates, the direction of the jump is not up, it is inclined
        transform.Translate(new Vector3(0, 10, 0), Space.World);
       }
    }

If using MovePosition

void Update() {
    if (Input.GetKeyDown(KeyCode.Space)) {
 
        var component = transform.GetComponent<Rigidbody2D>();
        component.MovePosition(component.position   new Vector2(0, 5));
    }
}

Slow ascent, highly available controls, a bit more code

  private float speed = 30;
  bool jump = false;
  float jhigh = 0f;
  float maxJhigh = 5f;
 
  void Update() {
 
    if (Input.GetKeyDown(KeyCode.Space)) {
        jump = true;
        print("start");
        jhigh = 0;
    }
    
    if (jump) {
        float high = 1 * speed * Time.deltaTime;
 
        if (jhigh   high >= maxJhigh) {
            jump = false;
        }
        transform.Translate(new Vector3(0, high, 0), Space.World);
        jhigh  = high;
        print(jhigh);
    }
  }

Use Force to apply force, there is a sense of bouncing, this is recommended

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

        var component = transform.GetComponent<Rigidbody2D>();
        component.AddForce(new Vector2(0, 10), ForceMode2D.Impulse);
    }
}

Added ray detection, you can only jump on the ground

//for output on the screen
private void OnDrawGizmos() {
    Gizmos.color = Color.white;
    Gizmos.DrawRay(transform.position   colliderOffset,Vector3.left);
}

void Update() {
    
    RaycastHit2D onGround2 = Physics2D.Raycast(transform.position   colliderOffset, -Vector2.up);
    print("b"   transform.position   ",c="   colliderOffset   ",d="   onGround2.distance);
    
    if (onGround2.distance <= 0) {
        if (Input.GetKeyDown(KeyCode.Space)) {
            var component = transform.GetComponent<Rigidbody2D>();
            component.AddForce(new Vector2(0, 10), ForceMode2D.Impulse);
        }
    }
}

The problem with the last version is that it may not be on the ground, but it needs to be filtered on other hidden colliders

    Debug.DrawRay(transform.position   colliderOffset, Vector3.down * 5);
    if (Input.GetKeyDown(KeyCode.Space) || Input.GetKeyDown(KeyCode.W)) {
        RaycastHit2D onGround2 = Physics2D.Raycast(transform.position   colliderOffset, -Vector2.up, 5, buildingsMask);
        if (onGround2.collider != null && onGround2.distance <= 0) {
            component.AddForce(new Vector2(0, 10), ForceMode2D.Impulse);
        }
    }

second stage jump

/**
 * whether to skip once
 */
private bool jumpOne;

void jump() {

    Debug.DrawRay(transform.position   colliderOffset, Vector3.down * 5);
    if (Input.GetKeyDown(KeyCode.Space) || Input.GetKeyDown(KeyCode.W)) {
        RaycastHit2D onGround2 = Physics2D.Raycast(transform.position   colliderOffset, -Vector2.up, 5, buildingsMask);

        if (onGround2.collider != null && onGround2.distance <= 0) {
            rig.AddForce(new Vector2(0, 10), ForceMode2D.Impulse);
            jumpOne = true;
        }
        else if (jumpOne) {
            // second jump
            rig.AddForce(new Vector2(0, 10), ForceMode2D.Impulse);
            jumpOne = false;
        }
    }
}

Thank you hope it can help you