Project_Junker/unity_Project/Assets/Scripts/maxHeight.cs

using UnityEngine;
using System.Collections;

public class maxHeight : MonoBehaviour {

	private float height;

	// Use this for initialization
	void Start () {
		height = transform.position.y;
	}
	
	// Update is called once per frame
	void FixedUpdate () {
		if (transform.position.y > height) {
			Vector3 pos = transform.position;
			pos.y = height;
			transform.position = pos;
		}
	
	}
}