Converting the Z axis to the Y axis...

Unity Engine
1

Hello. This script from the Unity wiki is designed to allow the player to drag an object with the mouse. Currently, the script only works if the camera is looking down at the XZ plane, I tried to modify it to allow the use of the XY plane, but I failed. How would I modify this script to allow the player to be facing the Z axis and have the mouse move the object along the XY plane? Thanks

var normalCollisionCount = 1;
var moveLimit = .5;
var collisionMoveFactor = .01;
var addHeightWhenClicked = 0.0;
var freezeRotationOnDrag = true;
var cam : Camera;
private var myRigidbody : Rigidbody;
private var myTransform : Transform;
private var canMove = false;
private var yPos : float;
private var gravitySetting : boolean;
private var freezeRotationSetting : boolean;
private var sqrMoveLimit : float;
private var collisionCount = 0;
private var camTransform : Transform;

function 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
}

function OnMouseDown () {
    canMove = true;
    myTransform.Translate(Vector3.up*addHeightWhenClicked);
    gravitySetting = myRigidbody.useGravity;
    freezeRotationSetting = myRigidbody.freezeRotation;
    myRigidbody.useGravity = false;
    myRigidbody.freezeRotation = freezeRotationOnDrag;
    yPos = myTransform.position.y;
}

function OnMouseUp () {
    canMove = false;
    myRigidbody.useGravity = gravitySetting;
    myRigidbody.freezeRotation = freezeRotationSetting;
    if (!myRigidbody.useGravity) {
        myTransform.position.y = yPos-addHeightWhenClicked;
    }
}

function OnCollisionEnter () {
    collisionCount++;
}

function OnCollisionExit () {
    collisionCount--;
}

function FixedUpdate () {
    if (!canMove) return;
    
    myRigidbody.velocity = Vector3.zero;
    myRigidbody.angularVelocity = Vector3.zero;
    myTransform.position.y = yPos;
    var mousePos = Input.mousePosition;
    var move = cam.ScreenToWorldPoint(Vector3(mousePos.x, mousePos.y, camTransform.position.y - myTransform.position.y)) - myTransform.position;
    move.y = 0.0;
    if (collisionCount > normalCollisionCount) {
        move = move.normalized*collisionMoveFactor;
    }
    else if (move.sqrMagnitude > sqrMoveLimit) {
        move = move.normalized*moveLimit;
    }
    
    myRigidbody.MovePosition(myRigidbody.position + move);
}

@script RequireComponent(Rigidbody)
2

Anyone?