接到上级命令，调研Post Processing Stack V2插件
baidu搜集资料如下：
git地址：
https://github.com/Unity-Technologies/PostProcessing
Unity 5.6版本介绍【摘自官方】
https://blog.csdn.net/Xushuai0616/article/details/70145974
Image Effects and Post Processing Stack
https://blog.csdn.net/qq_17758883/article/details/77453673
http://v.youku.com/v_show/id_XMjI4MTE4MzY1Mg==.html
Post Processing Stack插件包导入
https://blog.csdn.net/ws11579/article/details/72870127
Post Processing Stack 早期版本（V1）教程
https://www.bilibili.com/video/av14601386/
https://v.qq.com/x/page/a0515nmvgp0.html
http://bbs.cgwell.com/thread-39627-1-1.html
Post Processing Stack V2教程
https://www.jianshu.com/p/40cc8a484fdb
http://v.youku.com/v_show/id_XMzM0NzE5MTcwNA==.html