FloatingPointOriginMoveS.cs

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using UnityEngine.SceneManagement;

//http://wiki.unity3d.com/index.php?title=Floating_Origin
public class FloatingPointOriginMoveS : MonoBehaviour {

	[Header("Settings")]
	[Tooltip("When Target's position reaches this magnitude/distance, Target and Scene Root transforms will be moved.")]
	public float _threshold = 1000f;

	[Header("References")]
	[Tooltip("This Transform we will use to calculate the distance from origin. It will be moved back to near origin.")]
	public Transform _target;

	void Awake()
	{
		if (_target == null)
			_target = Camera.main.transform;
	}

	void LateUpdate()
	{
		Vector3 targetPos = _target.position;
		targetPos.y = 0f;

		if (targetPos.magnitude > _threshold)
		{
			foreach (GameObject rootGO in SceneManager.GetActiveScene().GetRootGameObjects())
			{
				rootGO.transform.position -= targetPos;
			}
		}
	}

}