// Set main color to red
renderer.material.color = Color.red;

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
void Awake() {
renderer.material.color = Color.red;
}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

def Awake():
renderer.material.color = Color.red

// Change renderer's material each changeInterval
// seconds from the material array defined in the inspector.

var materials : Material[];
var changeInterval = 0.33;

function Update () {
if (materials.Length == 0) // do nothing if no materials
return;

// we want this material index now
var index : int = Time.time / changeInterval;
// take a modulo with materials count so that animation repeats
index = index % materials.Length;
// assign it to the renderer
renderer.sharedMaterial = materials[index];
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
public Material[] materials;
public float changeInterval = 0.33F;
void Update() {
if (materials.Length == 0)
return;

int index = Time.time / changeInterval;
index = index % materials.Length;
renderer.sharedMaterial = materials[index];
}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

public materials as (Material)

public changeInterval as single = 0.33F

def Update():
if materials.Length == 0:
return
index as int = (Time.time / changeInterval)
index = (index % materials.Length)
renderer.sharedMaterial = materials[index]