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                            <article id="post-273252" class="post-273252 post type-post status-publish format-standard hentry category-pnotes tag-android tag-ios tag-shader tag-15905 entry">
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                            <h1 class="entry-title">AB打包有的Shader没有触发IPreprocessShaders的回调</h1>
                            <div class="entry-info">
                                                                <time class="entry-date published" datetime="2022-07-10T03:29:18+08:00" pubdate>
                                    2022年7月10日 03:29                                </time>
                                <span class="dot">•</span>
                                <a href="https://blog.ytso.com/category/tech/pnotes" rel="category tag">编程笔记</a>                                                            </div>
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<p class="toc-title"><strong>文章目录</strong><span class="toc-controller toc-controller-show">[隐藏]</span></p>
<ul>
<li class="toc-level2"><a href="#toc_1">Shader</a></li>
<li class="toc-level2"><a href="#toc_2">Rendering</a></li>
<li class="toc-level2"><a href="#toc_3">Android</a></li>
<li class="toc-level2"><a href="#toc_4">AssetBundle</a></li>
</ul>
</div>
<p></br></p>
<p>1）AB打包有的Shader没有触发IPreprocessShaders的回调<br />​2）场景中有多灯光导致粒子系统大量不合批<br />3）获取Android和iOS的设备唯一标识符<br />4）使用了Variant的AB包里的资源会判断为冗余</p>
<hr/>
<p>这是第302篇UWA技术知识分享的推送。今天我们继续为大家精选了若干和开发、优化相关的问题，建议阅读时间10分钟，认真读完必有收获。</p>
<p>UWA 问答社区：<a href="https://answer.uwa4d.com/" rel="noopener">answer.uwa4d.com</a><br />UWA QQ群2：793972859（原群已满员）</p>
<h2 id="toc_1">Shader</h2>
<p><strong>Q：在Addressable里面打包AB，其中的Shader打包并没有触发IPreprocessShaders里面的回调，请问是什么原因？</strong></p>
<blockquote>
<p>A：增量打包时已经打包的Shader不会触发该回调，只有新打包的Shader才会。不管是Addressable打包或者是其他的打包方式都类似。如果需要通过IPreprocessShaders来进行Shader变体剔除，那么还是建议重新全量打包一次，或者打包时设置ForceRebuild。</p>
</blockquote>
<p><strong>感谢宗卉轩@UWA问答社区提供了回答</strong></p>
<hr/>
<h2 id="toc_2">Rendering</h2>
<p><strong>Q：场景中有多灯光，导致了粒子系统大量的不合批，该如何优化？</strong></p>
<blockquote>
<p>A：测试了一下，在2019.4.14版本中，如果多灯光“影响”到了粒子系统，确实会导致本该合批的ParticleSystem不能合批，虽然本身渲染的时候不会对ParticleSystem产生实际影响。在2020.3.17和2021.3.4版本中都没有这个问题。对于不是2020及以上版本的Unity，需要调整一下Light的CullingMask，不让其对ParticleSystem所在的Layer产生影响，就可以合批了。比如粒子特效在TransparentFX层，光源的CullingMask不包括这一个Layer即可。</p>
<p><center><noscript><img decoding="async" alt="AB打包有的Shader没有触发IPreprocessShaders的回调" src="http://ytso-blog-oss-img.oss-accelerate.aliyuncs.com/wp-content/uploads/2022/07/09/20220710033004112.png"/></noscript><img decoding="async" class="j-lazy" alt="AB打包有的Shader没有触发IPreprocessShaders的回调" src="https://blog.ytso.com/wp-content/themes/justnews/themer/assets/images/lazy.png" data-original="http://ytso-blog-oss-img.oss-accelerate.aliyuncs.com/wp-content/uploads/2022/07/09/20220710033004112.png"/></center></p>
<p> </p>
</blockquote>
<p><strong>感谢Xuan@UWA问答社区提供了回答</strong></p>
<hr/>
<h2 id="toc_3">Android</h2>
<p><strong>Q：请教获取Android和iOS的设备唯一标识符的方式。</strong></p>
<blockquote>
<p>A1：Android有获取IMEI的接口。如果iOS 15以后的设备设置不追踪，目前是无法获取设备唯一ID的，得从其他类似热云插件的方式获取。</p>
</blockquote>
<p><strong>感谢Knight-132872@UWA问答社区提供了回答</strong></p>
<blockquote>
<p>A2：Android是使用OAID或者UUID。iOS使用IDFA。刷机或者恢复出厂设置都会刷新ID，一些硬件层次的设备ID，在iOS 5.0以上不被允许获取，Android高版本中也不推荐使用。</p>
</blockquote>
<p><strong>感谢不君子@UWA问答社区提供了回答</strong></p>
<blockquote>
<p>A3：补充楼上的方案，有下面两种方式：</p>
<ol>
<li>原生条件下，Android可以使用UUID的方式，iOS使用楼上说的IDFA，但是需要自己做兼容适配。</li>
<li>可以借助SDK，获取SDK的OpenID。这个是可靠和稳定的，优点是不需要兼容平台，但是需要接入SDK。</li>
</ol>
</blockquote>
<p><strong>感谢廖武兴@UWA问答社区提供了回答</strong></p>
<hr/>
<h2 id="toc_4">AssetBundle</h2>
<p><strong>Q：使用UWA AssetBundle检测服务，发现一些使用了Variant的AB包里的资源会被判定为冗余，是Bug吗？</strong></p>
<blockquote>
<p>A：使用Variant方式打包的AB中，资源名字完全相同的资源会生成完全一致的Guid，以实现它作为资源变体的功能，在加载的时候可以按需替换，而一般会认为Guid相同的资源就是同一份资源，所以有可能是这个原因导致误判成冗余。可以改下资源名字或者不用Variant的方式打包试试。</p>
</blockquote>
<p><strong>感谢宗卉轩@UWA问答社区提供了回答</strong></p>
<p>封面图来源于网络</p>
<hr/>
<p>今天的分享就到这里。当然，生有涯而知无涯。在漫漫的开发周期中，您看到的这些问题也许都只是冰山一角，我们早已在UWA问答网站上准备了更多的技术话题等你一起来探索和分享。欢迎热爱进步的你加入，也许你的方法恰能解别人的燃眉之急；而他山之“石”，也能攻你之“玉”。</p>
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