Adjusting Camera for Drag Rigid Body Script.

I'm quite new and I found this code by Eric5h5 and its pretty neat. It allow you to move RigidBodies by mouse and prevents them from passing through each other even if you try to force it.

I want to learn how to adjust the camera for this code so that it works on other angles.

Thank you for your help.

CODE:

public class Dragable : MonoBehaviour {

 public int normalCollisionCount = 1;
 public float moveLimit = .5f;
 public float collisionMoveFactor = .01f;
 public float addHeightWhenClicked = 0.0f;
 public bool freezeRotationOnDrag = true;
 public Camera cam  ;
 private Rigidbody myRigidbody ;
 private Transform myTransform  ;
 private bool canMove = false;
 private float yPos;
 private bool gravitySetting ;
 private bool freezeRotationSetting ;
 private float sqrMoveLimit ;
 private int collisionCount = 0;
 private Transform camTransform ;
 
 void Start () 
 {
     myRigidbody = rigidbody;
     myTransform = transform;
     if (!cam) 
     {
         cam = Camera.main;
     }
     if (!cam) 
     {
         Debug.LogError("Can't find camera tagged MainCamera");
         return;
     }
     camTransform = cam.transform;
     sqrMoveLimit = moveLimit * moveLimit;   // Since we're using sqrMagnitude, which is faster than magnitude
 }
 
 void OnMouseDown () 
 {
     canMove = true;
     myTransform.Translate(Vector3.up*addHeightWhenClicked);
     gravitySetting = myRigidbody.useGravity;
     freezeRotationSetting = myRigidbody.freezeRotation;
     myRigidbody.useGravity = false;
     myRigidbody.freezeRotation = freezeRotationOnDrag;
     yPos = myTransform.position.y;
 }
 
 void OnMouseUp () 
 {
     canMove = false;
     myRigidbody.useGravity = gravitySetting;
     myRigidbody.freezeRotation = freezeRotationSetting;
     if (!myRigidbody.useGravity) 
     {
         Vector3 pos = myTransform.position;
         pos.y = yPos-addHeightWhenClicked;
         myTransform.position = pos;
     }
 }
 
 void OnCollisionEnter () 
 {
     collisionCount++;
 }
 
 void OnCollisionExit () 
 {
     collisionCount--;
 }
 
 void FixedUpdate () 
 {
     if (!canMove)
     {
         return;
     }
 
     myRigidbody.velocity = Vector3.zero;
     myRigidbody.angularVelocity = Vector3.zero;
 
     Vector3 pos = myTransform.position;
     pos.y = yPos;
     myTransform.position = pos;
 
     Vector3 mousePos = Input.mousePosition;
     Vector3 move = cam.ScreenToWorldPoint(new Vector3(mousePos.x, mousePos.y, camTransform.position.y - myTransform.position.y)) - myTransform.position;
     move.y = 0.0f;
     if (collisionCount > normalCollisionCount)        
     {
         move = move.normalized*collisionMoveFactor;
     }
     else if (move.sqrMagnitude > sqrMoveLimit) 
     {
         move = move.normalized*moveLimit;
     }
 
     myRigidbody.MovePosition(myRigidbody.position + move);
 }

}