Unity tutorial : rotate an object with mouse or touch in 3d

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Script used in this video :

using UnityEngine;
using System.Collections;

public class rotObj : MonoBehaviour 
{
    float rotSpeed = 20;

    void OnMouseDrag()
    {
        float rotX = Input.GetAxis("Mouse X")*rotSpeed*Mathf.Deg2Rad;
        float rotY = Input.GetAxis("Mouse Y")*rotSpeed*Mathf.Deg2Rad;

        transform.RotateAround(Vector3.up, -rotX);
        transform.RotateAround(Vector3.right, rotY);
    }
}

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