NGUI中使用U3D粒子特效

using UnityEngine;
using System.Collections;

/// <summary>
/// This is a container to deal with the particles render by control the render queue.
/// </summary>
[ExecuteInEditMode]
public class UIParticles : MonoBehaviour
{
private const float UPDATE_RENDER_TIME = 0.2f;
private float lastTime = 0f;
private Renderer[] rendererArray = null;
private bool isWidgetOK = false;
private bool isRendererArrayOK = false;
private Renderer tempMeshRenderer = null;

public bool isExplicit = false;
public int RenderQueue = 3000;
public UIWidget parentWidget = null;
public bool IsForward = true;

void OnDestroy()
{
rendererArray = null;
parentWidget = null;
}

void LateUpdate()
{
lastTime += Time.deltaTime;
if (lastTime < UPDATE_RENDER_TIME)
return;
lastTime = -Random.Range(0, UPDATE_RENDER_TIME);

if (parentWidget == null)
{
parentWidget = NGUITools.FindInParents<UIWidget>(this.gameObject);
}

if (rendererArray == null || rendererArray.Length == 0)
{
rendererArray = this.GetComponentsInChildren<Renderer>(true);
}

isWidgetOK = parentWidget != null && parentWidget.drawCall != null;
isRendererArrayOK = rendererArray != null && rendererArray.Length > 0;

if ((isWidgetOK || isExplicit) && (isRendererArrayOK))
{
OnChangeRenderQueue();
}
}

void OnChangeRenderQueue()
{
int curRenderQueue = (isExplicit || !isWidgetOK) ? RenderQueue : parentWidget.drawCall.finalRenderQueue;

if (IsForward)
curRenderQueue += 1;
else
curRenderQueue -= 1;

if (curRenderQueue != RenderQueue)
{
RenderQueue = curRenderQueue;
for (int i = 0; i != rendererArray.Length; ++i)
{
tempMeshRenderer = rendererArray[i];
if (tempMeshRenderer != null)
{
#if UNITY_EDITOR
tempMeshRenderer.sharedMaterial.renderQueue = RenderQueue;
#else
tempMeshRenderer.material.renderQueue = RenderQueue;
#endif
}
}
}
}
}