Rotating an object with mouse ... not working properly when camera is rotated

Unity Engine
1

I’m using the script below to rotate an object with the mouse/touch. It works perfectly when the camera is rotated at 0,0,0. However, when I try to use it when the camera is rotated at (0, 180, 0), it doesn’t work. The problem I am having is that the object rotates backwards and is also moved towards the camera a couple of units. I have tried setting the Y position to Screen.height - pos.y but that just causes more issues. What could the issue be?

Code:

using UnityEngine;
using System.Collections;

public class Spin : MonoBehaviour {

    private float baseAngle = 0.0f;

    void OnMouseDown(){
            Vector3 pos = Camera.main.WorldToScreenPoint (transform.position);
            pos = Input.mousePosition - pos;
            baseAngle = Mathf.Atan2 (pos.y, pos.x) * Mathf.Rad2Deg;
            baseAngle -= Mathf.Atan2 (transform.right.y, transform.right.x) * Mathf.Rad2Deg;
    }
   
    void OnMouseDrag(){
            Vector3 pos = Camera.main.WorldToScreenPoint (transform.position);
            pos = Input.mousePosition - pos;
            float ang = Mathf.Atan2 (pos.y, pos.x) * Mathf.Rad2Deg - baseAngle;
            transform.rotation = Quaternion.AngleAxis (ang, Vector3.forward);
    }
}
2

I think all you have to do is change line 19:

change the Vector3.forward to be Camera.main.transform.forward

Not sure however…

3

Changing Vector3.forward to Camera.main.transform.forward works for the rotation part. However, when I click on the object’s collider, it jumps to another position as opposed to when the camera is not rotated it simply stays in place and moves only when the mouse is dragged. Thanks for the advice, though!