Hi
I have been trying to figure out how to change the texture of the cube dymically
this is the script that i have used. It changes the texture only once

using UnityEngine;
using System.Collections;

public class NewBehaviourScript : MonoBehaviour {
public float updateInterval = 0.5F;

private float accum = 0; // FPS accumulated over the interval
private int frames = 0; // Frames drawn over the interval
private float timeleft;

// Use this for initialization
void Start () {

}

// Update is called once per frame
void Update () {

timeleft -= Time.deltaTime;
accum += Time.timeScale/Time.deltaTime;
++frames;

// Interval ended - update GUI text and start new interval
if( timeleft {
// display two fractional digits (f2 format)
float fps = accum/frames;
string format = System.String.Format("{0:F2} FPS",fps);
guiText.text = format;

if(fps {
Texture2D tex = Resources.Load("5") as Texture2D;
GameObject.Find("Cube").renderer.material.mainTexture= tex;
}
else
{

Texture2D tex = Resources.Load("1") as Texture2D;
GameObject.Find("Cube").renderer.material.mainTexture= tex;
}
// DebugConsole.Log(format,level);
timeleft = updateInterval;
accum = 0.0F;
frames = 0;
}

}
}

I think update function is been called only once