Tornado Particle Effect
http://v.youku.com/v_show/id_XODM3NzA0NDcy.html
http://v.youku.com/v_show/id_XODM3ODQwMDY4.html
http://v.youku.com/v_show/id_XODM3ODQ4NzEy.html
Maya2Renderer
http://v.youku.com/v_show/id_XODQwMzAwMzg0.html
http://v.youku.com/v_show/id_XODQwMzAxNjYw.html
原文：http://www.cnblogs.com/yaoyansi/p/4141586.html