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diff --git a/cg/space.md b/cg/space.md
@@ -0,0 +1,2 @@
+# 坐标系
+
diff --git a/index/article.md b/index/article.md
@@ -17,6 +17,8 @@
 
 ### web
 - [网页开发内容](../web/index.md)
+- [webassembly](../web/webAssembly.md)
+- [http](../web/http.md)
 
 #### [nodejs](../nodejs/index.md)
 - [测试模块](../nodejs/test.md)
@@ -25,6 +27,7 @@
 - [图像处理](../nodejs/ImageManipulation.md)
 - [diff算法原理](../nodejs/diff.md)
 - [electron框架](../nodejs/electron.md)
+- [quill富文本编辑器](../nodejs/quill.md)
 
 ## 整理总结
 

diff --git a/index/community.md b/index/community.md
@@ -37,6 +37,12 @@ MQTT（Message Queuing Telemetry Transport，消息队列遥测传输协议）
 - [Moveable is Draggable, Resizable, Scalable, Rotatable, Warpable, Pinchable, Groupable, Snappable](https://github.com/daybrush/moveable)
 - [rrweb refers to 'record and replay the web', which is a tool for recording and replaying users' interactions on the web](https://github.com/rrweb-io/rrweb)
 
+### [SWIG](https://swig.org/)
+
+SWIG is a software development tool that connects programs written in C and C++ with a variety of high-level programming languages. SWIG is used with different types of target 
+
+languages including common scripting languages such as Javascript, Perl, PHP, Python, Tcl and Ruby.
+
 ## DICOM
 
 - IODs Information Object Definitions信息对象定义

diff --git a/index/online.md b/index/online.md
@@ -29,6 +29,7 @@
 - [BimAnt](http://www.bimant.com/blog/)
 - [云风的BLOG](https://blog.codingnow.com/)
 - [cppmore](https://www.cppmore.com/)
+- [李逸-数学教授-基本分析讲义](https://math.seu.edu.cn/ly/list.htm)
 
 ## 工具
 

diff --git a/index/standard.md b/index/standard.md
@@ -36,6 +36,13 @@
 - [CT](../cg/ct.md)
 - [GIMP](../gimp/using.md)
 
+### Tool
+
+- [ImageMagick](https://imagemagick.org/index.php)
+    - [The WebAssembly library for ImageMagick: magick-wasm](https://github.com/dlemstra/magick-wasm)
+        - [browser demo](https://dlemstra.github.io/magick-wasm-docs/classes/magick-image)
+
+
 ### OHIF
 
 - [Open Health Imaging Foundation](https://ohif.org/)

diff --git a/math/math.css b/math/math.css
@@ -13,4 +13,7 @@ body {
 em {
     font-style: normal;
     font-weight: bolder;
+}
+blockquote {
+    font-size: smaller;
 }
diff --git a/math/pbr3ed.html b/math/pbr3ed.html
@@ -57,6 +57,14 @@ <h5>7.2.1 Evaluating Samping Patterns: Discrepancy</h5>
                 </blockquote>
                 <p></p>
             </div>
+            <div>
+                <h5>7.3 Stratified Sampling</h5>
+                <p>The first Sampler implementation that we will introduce subdivides pixel areas into rectangular regions and generates a single sample inside each region. These regions are commonly called strata, and this sampler is called the StratifiedSampler.</p>
+                <blockquote cite="https://developer.nvidia.com/rtx/dlss">
+                    分层抽样（Stratified Sampling）
+                </blockquote>
+                <p></p>
+            </div>
         </div>
     </div>
 </body>

diff --git a/math/transform.html b/math/transform.html
@@ -15,6 +15,7 @@ <h1>transform in render detail</h1>
                     <li>
                         <a href="#section0">Coordinate System</a>
                         <ol>
+                            <li><a href="#section0g">Standard Basis</a></li>
                             <li><a href="#section0e">Object Space</a></li>
                             <li><a href="#section0d">World Space</a></li>
                             <li><a href="#section0f">Camera Space</a></li>
@@ -47,6 +48,19 @@ <h1>transform in render detail</h1>
             <h4></h4>
             <div class="my-3">
                 <h4 id="section0">Coordinate System</h4>
+                <div>
+                    <h5 id="section0g">Standard Basis</h5>
+                    <p>space空间是一个集合，如欧几里得空间是点集，是有序实数元组。</p>
+                    <p>向量空间：欧几里得空间以向量的视角来看：欧几里得空间是起点到原点的向量集合。向量运算的结果是封闭closure的，满足一些性质。通常说的向量，就是欧几里得空间的元素。</p>
+                    <p>广义向量空间：把非欧几里得空间的向量空间称为广义向量空间。</p>
+                    <p>一个空间的基中，向量的个数称为维度。一个n维空间任何一组线性无关的向量，都是这个n维空间的一组基。n个非零正交向量一定是n维空间的基。</p>
+                    <p>正交基：如果一个空间的一组基两两正交，则称这组基为一组正交基。标准正交基Orthogonal Basis：如果一个空间的一组正交基，模均为1，则称这组基是一组标准正交基。</p>
+                    <p>从一维投影到高维投影，通过投影向量得到单位向量，就可以找出对应的一组正交基了。</p>
+                    <blockquote cite="https://www.cnblogs.com/webor2006/p/14376460.html">
+                        格拉姆-施密特过程（Gram-Schmidt过程），就是求正交基的过程
+                    </blockquote>
+                    <p>空间的基与坐标系是一一对应的关系，在n维空间，如果给定一组基，任何一个向量都可以表示成这组基的线性组合，且表示方法唯一。其他坐标系与标准坐标系的转换，任意坐标系的互换，本质就是线性变换。</p>
+                </div>
                 <div>
                     <h5 id="section0e">Object Space</h5>
                     <p>

diff --git a/nodejs/quill.md b/nodejs/quill.md
@@ -0,0 +1,10 @@
+# Quill
+
+## dev
+
+
+按照sharp
+npm config get userconfig 获取配置信息
+npm config edit 打开默认的配置文件
+npm config set sharp_binary_host "https://npmmirror.com/mirrors/sharp"
+npm config set sharp_libvips_binary_host "https://npmmirror.com/mirrors/sharp-libvips"