我们的法线贴图和其他很多游戏不一样，更容易理解也更容易使用，它是存储与对象空间而不是切线空间，也许下回有机会可以介绍一下。
Our normal maps are different from those in most games, and easier to understand and work with, because they're stored in object-space instead of tangent-space. Maybe I'll write about that next time!
因为执行起来非常简单，所以它能和其他类型的贴图一起使用。
Because of its ease of implementation, it can be used in conjunction with other types of mapping.
它也允许你重复你的贴图或是重新使用其他地方的网格元素，旋转，扭曲他们直到你觉得合适为止。
It also allows you tile your map or re-use elements of your mesh on other places, rotating and twisting these as you see fit.
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