通过画面来吸引消费者的游戏始终都不是一个好方案
画面再强，玩一段时间也会腻味的。比如Q4，我玩了大概5个小时就没有往后的欲望了

故事性，游戏性才是持久力啊~~~~~~

卡神都觉悟了~~~~

z-fai是JC首先提出的，是给某人的e-mail里提到的
所以又称为Carmack’s Reverse


A more elegant solution is proposed in [Everitt and Kilgard 2002] , which was partially inspired by an insight of John Carmack, lead programmer of id software [Carmack 2000]. First off, instead of computing the stencil values by incrementing front facing shadow quads and decrementing back facing shadow quads on Z-buffer pass, the entire process is modified to count from infinity instead of from the viewpoint