プレイヤーの上下左右の移動と攻撃※編集中

Player.cs

using UnityEngine;
using System.Collections;

public class Player : MonoBehaviour
{

    private CharacterController characterController;
    private Vector3 velocity;
    [SerializeField]
    private float walkSpeed;
    private Animator animator;

    void Start()
    {
        characterController = GetComponent<CharacterController>();
        animator = GetComponent<Animator>();
    }

     void Update()
    {
        if (Input.GetButtonDown("Fire1"))

        {
            animator.SetBool("Attack", true);
        }
        if (characterController.isGrounded)
        {
            velocity = new Vector3(Input.GetAxis("Horizontal"), 0f, Input.GetAxis("Vertical"));

            if (velocity.magnitude > 0.1f)
            {
                animator.SetBool("isRunning", true);
                transform.LookAt(transform.position + velocity);
            }
            else
            {
                animator.SetBool("isRunning", false);
            }
        }
        velocity.y += Physics.gravity.y * Time.deltaTime;
        characterController.Move(velocity * walkSpeed * Time.deltaTime);
    }
}