http://m.blog.csdn.net/blog/stalendp/40859441

官方例子AngryBots的链接地址：http://u3d.as/content/unity-technologies/angry-bots/5CF

《Unity Shaders and Effects Cookbook》的章节：

Chapter 10 Screen Effects with Unity Render Textures

Chapter 11 Gameplay and Screen Effects

[GPU Gems] Real-Time Glow：http://http.developer.nvidia.com/GPUGems/gpugems_ch21.html

using UnityEngine;
[ExecuteInEditMode]
public class _MultiTap_y: MonoBehaviour
{
public GUISkin skin;
public string[] labels;
public Rect[] rLabels;
public float[] vals;
public Rect[] rSliders;
public Material myMat;
void OnGUI()
{
GUI.skin = skin;
for (int i = 0; i < labels.Length; i++)
{
GUI.Label(rLabels[i], labels[i]);
}
vals[0] = GUI.HorizontalSlider(rSliders[0],vals[0],-8f,8f);
}
void OnRenderImage (RenderTexture src, RenderTexture dst)
{
Graphics.BlitMultiTap(src,dst,myMat,
new Vector2(vals[0],vals[0]),
new Vector2(vals[0],vals[0])
);
}
}

//====================

Shader "Tut/Effects/ConeTap_0y" {
Properties {
_MainTex ("", 2D) = "white" {}
}
Subshader {
ZTest Always Cull Off ZWrite Off Fog { Mode Off }
Pass {
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#include "UnityCG.cginc"

struct v2f {
float4 pos : POSITION;
half4 uv[2] : TEXCOORD0;
};
float4 _MainTex_TexelSize;
float4 _BlurOffsets;
v2f vert (appdata_img v)
{
v2f o;
float offX = _MainTex_TexelSize.x * _BlurOffsets.x;
float offY = _MainTex_TexelSize.y * _BlurOffsets.y;