import{_ as x,c as t,a as j,b as m,d as l,e as c,f as e,r as n,o as i}from"./app-BVb9so0E.js";const o="/assets/transform_normal-BoPThMlc.svg",r={};function u(d,s){const a=n("RouteLink");return i(),t("div",null,[s[19]||(s[19]=j('<h1 id="几何变换-三" tabindex="-1"><a class="header-anchor" href="#几何变换-三"><span>几何变换（三）</span></a></h1><hr><h2 id="_7-法线变换" tabindex="-1"><a class="header-anchor" href="#_7-法线变换"><span>7. 法线变换</span></a></h2><p>做几何变换时，法线比较特殊，需要保证法线经过变换之后仍然垂直于原先的切平面，如果使用和顶点变换相同的变换，无法保证这一点</p><h3 id="_7-1-举例" tabindex="-1"><a class="header-anchor" href="#_7-1-举例"><span>7.1 举例</span></a></h3><figure><img src="'+o+'" alt="" tabindex="0" loading="lazy"><figcaption></figcaption></figure><p>如图，线段ab经过放缩变换之后成为a&#39;b&#39;，但法线经过同样的放缩矩阵变换之后发生错误，实际法线需要另外的矩阵计算</p><h3 id="_7-2-法线变换矩阵" tabindex="-1"><a class="header-anchor" href="#_7-2-法线变换矩阵"><span>7.2 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