UI Camera上でNGUIよりも手前に描画するコンポーネント

RenderFrontThanNGUI.cs

using UnityEngine;
using System.Collections;

public class RenderFrontThanNGUI : MonoBehaviour
{
    [SerializeField]
    int rQueue = 4000;

    void Start ()
    {
        renderer.material.renderQueue = rQueue;

        Transform trans = transform;
        for (int i = 0; i < trans.childCount; i++) {
            trans.GetChild (i).gameObject.renderer.material.renderQueue = rQueue;
        }
    }
}