Script for Unity to add Drag and Drop support for 2D/3D objects

DragAndDrop.cs

//
//  DragAndDrop.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;

[RequireComponent(typeof(Collider))]

public class DragAndDrop : MonoBehaviour {

    // The plane the object is currently being dragged on
    Plane dragPlane;

    // The difference between where the mouse is on the drag plane and 
    // where the origin of the object is on the drag plane
    Vector3 offset;

    Camera myMainCamera;

    void Start() {
        myMainCamera = Camera.main;
    }

    void OnMouseDown() {

        dragPlane = new Plane(myMainCamera.transform.forward, transform.position);
        Ray camRay = myMainCamera.ScreenPointToRay(Input.mousePosition);

        float planeDist;
        dragPlane.Raycast(camRay, out planeDist);
        offset = transform.position - camRay.GetPoint(planeDist);
    }

    void OnMouseDrag() {

        Ray camRay = myMainCamera.ScreenPointToRay(Input.mousePosition);

        float planeDist;
        dragPlane.Raycast(camRay, out planeDist);
        transform.position = camRay.GetPoint(planeDist) + offset;
    }
}

Thank you so much!
Solved the problem of mesh items drag&drop inventory mechanics