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lmj01 · Jan 29, 2024 · 7111737 · 7111737
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diff --git a/cg/geometry.md b/cg/geometry.md
@@ -0,0 +1,8 @@
+# Geometry
+
+## Projective Geometric Algebra
+
+- [Projective Geometric Algebra](http://projectivegeometricalgebra.org/)    
+- [Conformal Geometric Algebra -- CGA](https://conformalgeometricalgebra.org/wiki/index.php?title=Main_Page)
+- [Rigid Geometric Algebra -- RGA](https://rigidgeometricalgebra.org/wiki/index.php?title=Main_Page)
+- [A C++ library that implements much of this math is available under the MIT license on GitHub](https://github.com/EricLengyel/Terathon-Math-Library)
diff --git a/cg/shader.md b/cg/shader.md
@@ -138,5 +138,9 @@ mat3(
 - [WebGPU Shading Language](https://gpuweb.github.io/gpuweb/wgsl/)
 - [WebGPU深入探索](http://www.bimant.com/blog/webgpu-deep-dive/)
 
+## 参考
+
+- [the books of shader详细解说shader的开源书籍](https://thebookofshaders.com/)
+- [GPU Pro 360 Guide to Geometry Manipulation书籍]()
 
 
diff --git a/cg/threejs/index.md b/cg/threejs/index.md
@@ -3,4 +3,9 @@
 - [乱记](./threejs.md)
 - [Bump map](./bumpmap.md)
 - [RayCaster](./raycaster.md)
-- [Loader细节](./loader.md)
+- [Loader细节](./loader.md)
+
+## 参考
+
+- 
+- [一个模拟PC桌面的个人网站,可以参考](https://henryheffernan.com/)
diff --git a/cg/tools/CAD.md b/cg/tools/CAD.md
@@ -16,6 +16,10 @@
 图框
 ### 组
 
+## [exocad](https://exocad.com/)
+
+Exocad是一款跨平台的应用程序，免费使用。
+
 ## 参考
 
 - [FreeCAD is an open-source parametric 3D modeler made primarily to design real-life objects of any size](https://github.com/FreeCAD/FreeCAD)