Character Movement in Unity…

Codes:

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

public class PlayerController : MonoBehaviour
{
    private Rigidbody2D rb2D;

    private float moveSpeed;
    private float jumpForce;
    private bool isJumping;
    private float moveHorizontal;
    private float moveVertical;

    // Start is called before the first frame update
    void Start()
    {
        rb2D = gameObject.GetComponent<Rigidbody2D>();

        moveSpeed = 3f;
        jumpForce = 60f;
        isJumping = false;
    }

    // Update is called once per frame
    void Update()
    {
        moveHorizontal = Input.GetAxisRaw("Horizontal");
        moveVertical = Input.GetAxisRaw("Vertical");
    }

    private void FixedUpdate()
    {
        if (moveHorizontal > 0.1f || moveHorizontal < -0.1f)
        {
            rb2D.AddForce(new Vector2(moveHorizontal * moveSpeed, 0f), ForceMode2D.Impulse);
        }

        if (!isJumping && moveVertical > 0.1f )
        {
            rb2D.AddForce(new Vector2(0f, moveVertical * jumpForce), ForceMode2D.Impulse);
        }
    }

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

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

From the program:

void Update()
    {
        moveHorizontal = Input.GetAxisRaw("Horizontal");
        moveVertical = Input.GetAxisRaw("Vertical");
    }        

• moveHorizontal and moveVertical is a variable that is used to take Horizontal and Vertical Input from the user with up(w), down(s) & left() & right keys using - Input.GetAxisRaw(“Horizontal”);

if (moveHorizontal > 0.1f || moveHorizontal < -0.1f)
        {
            rb2D.AddForce(new Vector2(moveHorizontal * moveSpeed, 0f), ForceMode2D.Impulse);
        }

        if (!isJumping && moveVertical > 0.1f )
        {
            rb2D.AddForce(new Vector2(0f, moveVertical * jumpForce), ForceMode2D.Impulse);
        }        

• moveHorizontal > 0.1f means user is clicking right arrow or d key same as for moveHorizontal < -0.1f means user is clicking left arrow or a key…

rb2D.AddForce(new Vector2(moveHorizontal * moveSpeed, 0f), ForceMode2D.Impulse);        

• AddForce will add force on rb2D and new Vector2(moveHorizontal * moveSpeed, 0f) will move the the object Horizontally according to the moveSpeed in X-axis and cuz of 0f, the gameObject will not move in Y-axis…and same mechanism is for isJumping…

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

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

• If the gameObject touches the object having tag “Platform” then isJumping becomes false…It is OnTriggerEnter…
• And same for OnTriggerExit, isJumping becomes true…

That’s all…Thank you for reading??:)