InvisibleWall.cs

using UnityEngine;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using Lidgren.Network;

[AddComponentMenu("Liberi/Invisible Wall")]
public class InvisibleWall : MonoBehaviour
{
    public Color Color = new Color(1f, .5f, 1f, .5f);

    void OnDrawGizmos ()
    {
        Gizmos.color = Color;

        if (collider != null)
            Gizmos.DrawCube(collider.bounds.center, collider.bounds.size);
        else Gizmos.DrawCube(transform.position, transform.localScale);
    }
}