Unity 4.3 Parallax script

Parallax.cs

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using System.Linq;

public class Parallax : MonoBehaviour {

	// Scale of movement 0 being stationary 1 being sticking to the camera.
	public Vector2 parallaxScale = new Vector2( 0.5f, 0.2f );

	// Do child elements loop?
	public bool looping;
	
	private List<Transform> loopElements = new List<Transform>();
	private Vector3 prevCameraPos;
	
	void Start () {
		if ( looping ) {
			for ( int i = 0; i < transform.childCount; i++ ) {
				Transform child = transform.GetChild(i);
				
				// Add only the visible children
				if ( child.renderer != null ) {
					loopElements.Add(child);
				}

				loopElements = loopElements.OrderBy(
					t => t.position.x
				).ToList();
			}
		}
		prevCameraPos = Camera.main.transform.position;
	}

	void Update () {
		Vector3 posDiff = Camera.main.transform.position - prevCameraPos;

		posDiff.x = posDiff.x * parallaxScale.x;
		posDiff.y = posDiff.y * parallaxScale.y;

		transform.position += posDiff;

		if ( looping ) {
			Transform possibleFlipper;
			if ( posDiff.x > 0 ) {
				// Moving forwards
				possibleFlipper = loopElements.FirstOrDefault();

				if ( possibleFlipper.renderer.IsVisibleFrom( Camera.main ) == false ) {
					// Flip it!
					Transform otherEnd = loopElements.LastOrDefault();

					possibleFlipper.position = new Vector3( otherEnd.position.x + otherEnd.renderer.bounds.size.x, possibleFlipper.position.y, possibleFlipper.position.z );

					loopElements.Remove( possibleFlipper );
					loopElements.Add( possibleFlipper );
				}
			} else {
				// Moving backwards
				possibleFlipper = loopElements.LastOrDefault();

				if ( possibleFlipper.renderer.IsVisibleFrom( Camera.main ) == false ) {
					// Flip it!
					Transform otherEnd = loopElements.FirstOrDefault();

					possibleFlipper.position = new Vector3( otherEnd.position.x - otherEnd.renderer.bounds.size.x, possibleFlipper.position.y, possibleFlipper.position.z );

					loopElements.Remove( possibleFlipper );
					loopElements.Insert( 0, possibleFlipper );
				}
			}

		}
		prevCameraPos = Camera.main.transform.position;
	}
}