first，I wish you a happy new year, and study in spring festival’s eve means you are hardworking,haha. I write in two languages. One passage write in Chineseone passage translate into English. My English is poor., If I write some thing wrong, welcome to correct my article.首先祝各位看官新春快乐，能在大年三十看博文学习的都是勤奋的人。我用了两种语言，一段英文一段中文。我英语不太好，如果有英语语法错误，或者写的不对的各位可以告诉我及时改正I study some about water lately. Looks like this in the gif; It looks not bad, but it is incomplete and regret.This shader is surface shader, used the tessellation technology by DX11.Because of used the tessellation ,this shader’s vertex function can’t pass parameter like position and normal, then, caused the water’s reflect light inaccuracy、can’t specular other things ,etc. The reason that can’t specular other things is can’t analysis reflection map. But just now I try to write a fragment shader that can use the tessellation, and succeed, then the shader can pass parameter. I will write it in the second blog article, this blog article just talk about water waves.最近研究了一下水体，效果如下图gif所示，乍看感觉还可以，但是有很多残念，这个例子是用surface shader写的，，运用了曲面细分等技术。由于用了曲面细分，所以surface shader的vert不能传出值，所以不能传出顶点坐标和normal值，造成了反光不准确，而且不能反射（大残念，水体不能反射= =），不能反射的原因是不能解析脚本传入的反射贴图reflection map。 但是写本文的同时突然试了一下 fragment shader，居然好用，这样也能传出值了，就在本文的（二）中研究，今天的（一）只研究水体的波动。
Most of maves are caused by the action of wind, it’s better to use circular waves in the pond scence.we just talk about the directional waves.大多数的波动是由于风吹动引起的，对于池塘中的水用圆形波更好一点，我们只讨论方向波
Mentioned waves, we all think of sin、cos ,etc. This shader also used them.if we just use sin , that effects looks awful.说起波动，大家想到的肯定是sin，cos，等函数，我们的水体也是用它做一些变换。如果单单是sin 未免有些单调，看起来也不真实。
so, in this shader, I used the Displacement mapping that I write a blog article about it before.That can add some other waves in water.所以本例中加入了之前写过曲面细分中的贴图置换（Displacement mapping），对水面加入一些杂波。But why to use the tessellation?our water in unity is a model. The plan model’s has little points, may be 100++. Used tessellation can add much more points, make the waves more smooth. The figure below is the waves not used tessellation.Looks like jag.为什么要加入曲面细分呢？我们的水面是一个平面，也就是plane，unity中的plane模型顶点数显而易见，看起来貌似100++，加入了曲面细分，顶点数就是原有的数倍，波浪看起来精致圆滑，下图为未经曲面细分的水面，（= =；这不就是锯齿吗）；
If you don’t want the real wave effect, you don’t need tessellation, like unity’s water4, water4 not wave truly, just some effects like normal, reflect ,etc. Brain always be cheated by eyes.
about tessellation you can see this I write before如果你不想要真实可见的波浪效果，你大可不用曲面细分，如unity自带的那种水体water4，water4等没有真正的波动，只是normal，反光等对你眼睛的一种欺骗。关于unity曲面细分的详细可见博主之前的这篇文章
Above I talked my shader is use sin, there are also many good waves like this. I refer to the water in 《GPU Gems》 , it used Gerstner Waves, its reality. The real waves have sharper peaks and wider troughs.刚刚说我的例子用的是sin波，还有很多很好的波形，参考了一下GPU gems中的水体，书上用的是Gerstner波，理由是—真实，真实的浪波比较尖，波谷比较宽Gerstner’s function is:Gerstner波的函数是：
then I try this
旅行还在继续，这个过程是艰难而又孤单的。
