Хочу менять спрайт персонажа в зависимости от позиции курсора на экране Unity 2D

Хотел сделать, чтобы при нажатии и удерживании правой кнопки мыши персонаж менял свой спрайт на "готов к стрельбе" (2D, вид сбоку), и чтобы показываемый спрайт зависел от положения курсора мыши на экране. Друг скинул мне кусок кода, я его интегрировал, получилось как-то так, вставил нужные спрайты в юнити, но ничего не поменялось. Вместо спрайтов при нажатии ПКМ ничего не происходит, скрипт стрельбы работает, но воспроизводится стандартная анимация с аниматора. Помогите с решением проблемы, ибо сам мало разбираюсь, начинающий.

Вот мой код:

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

[RequireComponent(typeof(SpriteRenderer))]
public class weapon : MonoBehaviour
{
    public Transform FirePoint;
    public Transform FirePoint_2;
    public GameObject BulletPrefab;
    public Vector2 lookDirection;
    public float lookAngle;
    public Rigidbody2D rb;

    //public Animator animator;

    bool scope = false;

    [Header("Add sprites in counter-clockwise order starting with east")]
    // array of sprites added in the inspector
    public Sprite[] directionSprites;

    // references to components
    public SpriteRenderer _spriteRenderer;
    public Camera _mainCamera;

    // called once when this component is first created
    public void Awake()
    {
        // get the SpriteRenderer component on this GameObject.
        // This can return null if there isn't one,
        // but we know there is one because of RequireComponent
        _spriteRenderer = GetComponent<SpriteRenderer>();

        // get the main camera in the scene
        _mainCamera = Camera.main;
    }


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

        var dir =Camera.main.ScreenToWorldPoint( Input.mousePosition)-FirePoint.transform.position;
        var angle = Mathf.Atan2(dir.y, dir.x) * Mathf.Rad2Deg -90f;
        FirePoint.rotation = Quaternion.AngleAxis(angle, Vector3.forward);

        //animator.SetBool("IsScoped", scope);

        if (Input.GetButtonDown("Fire2"))
        {
            scope = true;
        }
        else if (Input.GetButtonUp("Fire2"))
        {
            scope = false;
        }
        if (scope==true)
        {
            // get the current direction
            Vector2 directionTowardsMouse = GetDirectionTowardsMouse();
            // update the sprite
            UpdateSpriteDirection(directionTowardsMouse);
            Shoot();
        }

    }

    public Vector2 GetDirectionTowardsMouse()
    {
        // convert player position to screen position (pixel coordinates)
        Vector2 from = _mainCamera.WorldToScreenPoint(transform.position);

        // mouse position is already in screen space
        Vector2 to = Input.mousePosition;

        // difference in positions, imagine this vector
        // as an arrow starting at `from`, ending at `to`
        Vector2 positionalDifference = to - from;

        // normalizing the vector shortens it to 1 unit (represents only direction)
        // ie. right=(1,0), down=(0,-1), diagonal up&right (0.707, 0.707)
        return positionalDifference.normalized;
    }

    // calculates which sprite to select based on the given direction
    public void UpdateSpriteDirection(Vector2 direction)
    {
        // divide a circle into slices for each sprite to represent
        float sliceAngle = 360f / directionSprites.Length;

        // calculate the direction's angle (-180 to 180 range)
        float currentAngle = Mathf.Rad2Deg * Mathf.Atan2(direction.y, direction.x);

        // offset the angle by half a slice to center the slices
        // ie. when facing perfectly right, that's the center of a slice, not an edge
        currentAngle += sliceAngle * 0.5f;

        // put the angle range between 0 and 360 instead of -180 to 180
        currentAngle = Mathf.Repeat(currentAngle, 360);

        // get an index for which slice the direction is pointing
        int sliceIndex = Mathf.FloorToInt(currentAngle / sliceAngle);

        // set the sprite using that index (assuming sprites are in the array in counter clockwise order)
        _spriteRenderer.sprite = directionSprites[sliceIndex];
    }

    void Shoot()
    {
        
        if (Input.GetButtonDown("Fire1"))
        {
            GameObject fired_bullet = Instantiate(BulletPrefab, FirePoint_2.position, FirePoint.rotation);
            fired_bullet.GetComponent<Rigidbody2D>().velocity = FirePoint.up * 100f;
        }
    }



}