战争迷雾
Unity3D战争迷雾效果
http://www.ithao123.cn/content-3591304.html
http://liweizhaolili.blog.163.com/blog/static/16230744201431835652233/
Fog Of War shader(战争迷雾)
http://www.ceeger.com/forum/read.php?tid=3206
[Shader 着色器]在Unity 3D中实现战争迷雾
http://imgtec.eetrend.com/blog/6639