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<link itemprop="mainEntityOfPage" href="http://yoursite.com/2020/03/26/%E4%B8%80%E4%B8%AA%E6%99%AE%E9%80%9A%E7%9A%84%E6%B0%B4%E9%9D%A2%E6%B6%9F%E6%BC%AAShader/">
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<p>都2020年了，咱终于升级到HDRP，试了试ShaderGraph，感觉还是好简陋，日常报错卡顿。作为练手的第一个Shader先不写复杂的了。</p>
<h2 id="生成水波"><a href="#生成水波" class="headerlink" title="生成水波"></a>生成水波</h2><p>单个涟漪就是计算到起点的距离，根据距离去做水波。应该是可以用正弦函数去做的，但是截取单个水波有点麻烦，这里偷懒直接用smoothstep的三次函数去做了。内外两个半波相乘得到一个环形。<br><img src="https://s1.ax1x.com/2020/03/27/G96PiR.png" alt="波的生成"><br>通过根据时间调整距离来让水波动起来。<br><img src="https://s1.ax1x.com/2020/03/27/G9yDqe.gif" alt="手动扩散"><br>接下来就要根据时间去计算偏移量，首先计算一个周期让它能够重复扩散。<br><img src="https://s1.ax1x.com/2020/03/27/G9y0KO.png" alt="计算周期"><br>上面是扩散完成一次的周期，增大了一点来让每一次扩散之间有一定时间间隔。<br>下面的是水波传播一个波长的周期，这里是为了抵消初始时水波已经扩散的距离。没有的话水波会凭空出现。<br>然后就是用时间去做扩散。时间取模之后减去之前一个波长的周期，用来对距离做减法。这里引入一个相位来做随机。<br><img src="https://s1.ax1x.com/2020/03/27/G9ydxK.png" alt="波的扩散"><br>最后要做一个波的衰减，不然最后波会凭空消失。<br><img src="https://s1.ax1x.com/2020/03/27/G9yBrD.png" alt="波的衰减"><br>也是根据距离，做一个幂函数的衰减。最后作用到水波上。</p>
<h2 id="分块重复"><a href="#分块重复" class="headerlink" title="分块重复"></a>分块重复</h2><p>有了单个水波以后我们让他重复一下。先做个uv的分块。<br><img src="https://s1.ax1x.com/2020/03/27/G9ya26.png" alt="UV分块"><br>下面的噪声用来做每块里相位的随机。<br><img src="https://s1.ax1x.com/2020/03/27/G9yyad.png" alt="生成单个水波"><br>输入到之前写好的水波生成里。由于是uv分块水波不能跨越边界，调一下中心和扩散距离防止穿帮。<br><img src="https://s1.ax1x.com/2020/03/27/G9ygPI.png" alt="叠加多个水波"><br>重复4次吧，再多了有点重复了。最后把4种水波叠加起来，求个法线，就做完了。</p>
<h2 id="最终结果"><a href="#最终结果" class="headerlink" title="最终结果"></a>最终结果</h2><p><img src="https://s1.ax1x.com/2020/03/27/G96EQK.gif" alt="最终"><br>还算可以接受吧，其实因为分块不能大幅度调整位移，跟帧动画原理差不多，但是由于每个块加了一个随机相位效果还不错的样子。至于ShaderGraph怎么和其他材质做混合还是要再研究一下…</p>
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<a class="post-title-link" href="/2020/03/26/hello-world/" itemprop="url">Hello World</a></h1>
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<p>Welcome to <a href="https://hexo.io/" target="_blank" rel="noopener">Hexo</a>! This is your very first post. Check <a href="https://hexo.io/docs/" target="_blank" rel="noopener">documentation</a> for more info. If you get any problems when using Hexo, you can find the answer in <a href="https://hexo.io/docs/troubleshooting.html" target="_blank" rel="noopener">troubleshooting</a> or you can ask me on <a href="https://github.com/hexojs/hexo/issues" target="_blank" rel="noopener">GitHub</a>.</p>
<h2 id="Quick-Start"><a href="#Quick-Start" class="headerlink" title="Quick Start"></a>Quick Start</h2><h3 id="Create-a-new-post"><a href="#Create-a-new-post" class="headerlink" title="Create a new post"></a>Create a new post</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo new <span class="string">"My New Post"</span></span><br></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/writing.html" target="_blank" rel="noopener">Writing</a></p>
<h3 id="Run-server"><a href="#Run-server" class="headerlink" title="Run server"></a>Run server</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo server</span><br></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/server.html" target="_blank" rel="noopener">Server</a></p>
<h3 id="Generate-static-files"><a href="#Generate-static-files" class="headerlink" title="Generate static files"></a>Generate static files</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo generate</span><br></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/generating.html" target="_blank" rel="noopener">Generating</a></p>
<h3 id="Deploy-to-remote-sites"><a href="#Deploy-to-remote-sites" class="headerlink" title="Deploy to remote sites"></a>Deploy to remote sites</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo deploy</span><br></pre></td></tr></table></figure>
<p>More info: <a href="https://hexo.io/docs/one-command-deployment.html" target="_blank" rel="noopener">Deployment</a></p>
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