کد حرکت کاراکتر به چپ و راست و بالا و پایین به صورت دو بعدی در یونیتی

using UnityEngine;
 using System.Collections;
 
 public class Ctrl : MonoBehaviour
 {
     public float speed = 1.5f;
 
     void Update ()
     {
         if (Input.GetKey(KeyCode.LeftArrow))
         {
             transform.position += Vector3.left * speed * Time.deltaTime;
         }
         if (Input.GetKey(KeyCode.RightArrow))
         {
             transform.position += Vector3.right * speed * Time.deltaTime;
         }
         if (Input.GetKey(KeyCode.UpArrow))
         {
             transform.position += Vector3.up * speed * Time.deltaTime;
         }
         if (Input.GetKey(KeyCode.DownArrow))
         {
             transform.position += Vector3.down * speed * Time.deltaTime;
         }
     }
 }

نکته:
اسم اسکریپت سیشارپ رو بذارید Ctrl  که همنام با کلاسی هست که توی کد بالایی اومده.
منبع :

http://answers.unity3d.com/questions/667641/how-do-i-move-my-2d-object-using-arrow-keys-also-h.html



اینم یکی دیگه :



using UnityEngine;
using System.Collections;

public class Player : MonoBehaviour {

public float Gravity = 21f; //downward force
public float TerminalVelocity = 20f; //max downward speed
public float JumpSpeed = 6f;
public float MoveSpeed = 10f;

public Vector3 MoveVector {get; set;}
public float VerticalVelocity {get; set;}

public CharacterController CharacterController;

// Use this for initialization
void Awake () {
CharacterController = gameObject.GetComponent(“CharacterController”) as CharacterController;
}

// Update is called once per frame
void Update () {

checkMovement();
HandleActionInput();
processMovement();
}

void checkMovement(){
//move l/r
var deadZone = 0.1f;
VerticalVelocity = MoveVector.y;
MoveVector = Vector3.zero;
if(Input.GetAxis(“Horizontal”) > deadZone || Input.GetAxis(“Horizontal”) < -deadZone){
MoveVector += new Vector3(Input.GetAxis("Horizontal"),0,0);
}
//jump

}

void HandleActionInput(){
if(Input.GetButton("Jump")){
jump();
}
}

void processMovement(){
//transform moveVector into world-space relative to character rotation
MoveVector = transform.TransformDirection(MoveVector);

//normalize moveVector if magnitude > 1
if(MoveVector.magnitude > 1){
MoveVector = Vector3.Normalize(MoveVector);
}

//multiply moveVector by moveSpeed
MoveVector *= MoveSpeed;

//reapply vertical velocity to moveVector.y
MoveVector = new Vector3(MoveVector.x, VerticalVelocity, MoveVector.z);

//apply gravity
applyGravity();

//move character in world-space
CharacterController.Move(MoveVector * Time.deltaTime);
}

void applyGravity(){
if(MoveVector.y > -TerminalVelocity){
MoveVector = new Vector3(MoveVector.x, (MoveVector.y – Gravity * Time.deltaTime), MoveVector.z);
}
if(CharacterController.isGrounded && MoveVector.y < -1){
MoveVector = new Vector3(MoveVector.x, (-1), MoveVector.z);
}
}

public void jump(){
if(CharacterController.isGrounded){
VerticalVelocity = JumpSpeed;
}
}
}