Renderer.enabled

Description

Makes the rendered 3D object visible if enabled.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    public Renderer rend;

    void Start()
    {
        rend = GetComponent<Renderer>();
        rend.enabled = true;
    }

    // Toggle the Object's visibility each second.
    void Update()
    {
        // Find out whether current second is odd or even
        bool oddeven = Mathf.FloorToInt(Time.time) % 2 == 0;

        // Enable renderer accordingly
        rend.enabled = oddeven;
    }
}