Script to make a gameobject look at the mouse position in Unity

PointAtMouse.cs

//
//  PointAtMouse.cs
//
//  Created by Rigoberto Sáenz Imbacuán (https://linkedin.com/in/rsaenzi/)
//  Copyright © 2021. All rights reserved.
//

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

public class PointAtMouse : MonoBehaviour {

    Vector3 pointingTarget;

    void Update() {
        pointingTarget = Camera.main.ScreenToWorldPoint(Input.mousePosition + Vector3.back * Camera.main.transform.position.z);
        transform.LookAt(pointingTarget, Vector3.back);
    }

    void OnDrawGizmos() {
        Gizmos.DrawSphere(pointingTarget, 0.2f);
        Gizmos.DrawLine(transform.position, pointingTarget);
    }
}