Simple horizontal repeating background in Unity (C#)

RepeatingBackground.cs

using UnityEngine;
using System.Collections;

/// <summary>
/// For this to work, you need a background sprite that is
/// 1) cyclical: it's left side connects seam-less with it's right side
/// 2) it must at least span the width of the camera view
/// 3) it must be repeated twice (so you actually have the same thing three times, implying at least three times the camera view width)
/// 
/// TODO: To make things simpler, you can just mirror a single sprite/texture and repeat it three times
/// TODO: Also add vertical infinite scrolling
/// </summary>
public class RepeatingBackground : MonoBehaviour
{
	public Camera cam;

	int splitN = 3;

	float w;
	float xOffset;

	void Awake ()
	{
		if (!cam) {
			cam = Camera.main;
		}

		var sprite = GetComponent<SpriteRenderer> ();
		var bounds = sprite.bounds;

		// the actual sprite width is only one third of the total background (which is repeated a total of three times)
		w = bounds.extents.x * 2 / 3;
		xOffset = transform.position.x;
	}

	void Update ()
	{
		var pos = transform.position;
		var xDist = cam.transform.position.x - xOffset;
		var ix = (int)(xDist / w);

		pos.x = ix * w + xOffset;
		transform.position = pos;
	}


	#if UNITY_EDITOR
	/// <summary>
	/// Draw the tripple split up of the texture
	/// </summary>
	void OnDrawGizmosSelected ()
	{
		Gizmos.color = Color.yellow;

		var renderer = GetComponent<SpriteRenderer> ();
		if (renderer) {
			var bounds = renderer.bounds;

			var w = bounds.extents.x * 2 / 3;
			var h = bounds.extents.y * 2;
			var hHalf = h / 2;

			var yBase = bounds.center.y - h;
			var dY = Vector2.up * 2 * h;		// draw twice the height

			for (var i = 0; i <= splitN; ++i) {
				var lo = new Vector2(bounds.min.x + i * w, yBase);
				var hi = lo + dY;
				Gizmos.DrawLine (lo, hi);
			}
		}
	}
	#endif

}