Runner2018/Assets/!Santa/Scripts/SwitchAd.cs

using UnityEngine;
using System.Collections;

public class SwitchAd : MonoBehaviour
{
    public MeshRenderer Renderer;
    public Material[] Materials;

    private static int id = 0;

    private static void Next()
    {
        id++;
        if (id>5)
        {
            id = 0;
        }
    }

    // Use this for initialization
    private void OnEnable()
    {
        Renderer.sharedMaterial = Materials[id];
        Next();
       // Debug.Log("change");
    }
}