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如果你想深入理解FreeCAD，这里就是你该来的地方. 你能学到如何为你的需求定制FreeCAD.

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FreeCAD最秒的好处之一，就是它给你的灵活性. 你不需要作任何编译，不需要接触源代码，就可以写脚本，就可以作扩展，可触范围极广. 所有的脚本都用Python完成. 它是一门强大而简洁的编程语言. 有了简洁的Python脚本，你有权触及FreeCAD的任何部分. 比如说，你可以：
 * 创建和修改几何体：有没有这种情况？你需要的特殊对象，没有出现在FreeCAD的默认安装包里？你可以轻松创建一个新对象类型，既可以写脚本，也可以调配一个已有的类型.
 * 创建定制的工具和命令：目前，FreeCAD已经有了很广泛的功能，但是给终端用户的工具和命令还不是很多. 不过，你已经可以很容易地创建自己的工具包了.
 * 修改界面：FreeCAD的用户界面还处于十分基础的阶段. 但是如果你要有所扩展，工具都给你准备好了. 比如说，你可以创建一个工具条，把你的工具都放进去；你也可以创建一个特殊面板，用来与你的工具互动，诸如此类.
 * 修改场景表现：建立和计算几何体，在屏幕上显示那个几何体，这件事在FreeCAD里有不同的流程来处理. 场景元素显示在屏幕上的方式，你对此有完全控制权. 所以，你可以修改那个表现，与它交互，或者加入各种各样的定制行为和屏幕组件. 举几个例子，信息、拖拽、锚定或者暂时实体.

Customizing FreeCAD

 * Interface Customization: Starting with the beginning: Toolbars and shortcuts
 * Working with Macros: Easily record often repeated tasks or Python code
 * Macros recipes
 * Customize Toolbars
 * Installing more workbenches
 * Plugin Loader
 * Addons installer.FCMacro

General

 * Introduction to Python - See also other Python tutorials at the bottom of this page
 * FreeCAD scripting tutorial - A general look at python scripting in FreeCAD
 * FreeCAD Scripting Basics: Well, the basics...
 * Gui Command : Adding custom commands to the GUI
 * Using mixed Units in FreeCAD

Modules
As the functionality of FreeCAD is separated in Modules which deal with special data types and applications. FreeCAD has built-in modules and Extension Modules (plug-ins). Once plugin modules are installed, they become availible to you as easily as the built-in modules. The modules described below are the default modules, includeed in every FreeCAD installation.


 * The Builtin modules are the principal FreeCAD modules. They contain tools for manipulating general FreeCAD configurations, documents and their contents.
 * Workbench creation shows you how to create your own workbench

Working with Meshes

 * Mesh Scripting: How to interact with the Mesh Module

Working with Parts

 * The Part Module: How Open CASCADE Technology tools and structure is used in FreeCAD
 * Topological data scripting: How to interact with the Part Module
 * PythonOCC: How to unleash the whole Open CASCADE power
 * Mesh to Part: Converting between object types

Accessing the Coin scenegraph

 * The Coin/Inventor scenegraph: How the FreeCAD scene representation works
 * Pivy: How to access and modify the scenegraph

Controlling the Qt interface

 * PySide: How to access the interface, and modify its contents
 * Using the FreeCAD GUI in another Qt application with PyQt

Working with parametric objects

 * Scripted objects: How to make 100% Python-scripted objects in FreeCAD
 * Drawing Module: Automating the 3D-to-2D process

Examples

 * Code snippets : A collection of pieces of FreeCAD Python code, to serve as ingredients in your scripts...
 * Line drawing function: How to build a simple tool to draw lines
 * Dialog creation: How to construct dialogs with Qt designer, and use them in FreeCAD
 * Embedding FreeCAD: How to import FreeCAD as a Python module in other applications
 * The Draft Module adds basic 2d drawing functions to freecad. It is written entirely in Python, so it can be a good example if you want to write your own modules.
 * FreeCAD vector math library : A couple of handy functions to manipulate FreeCAD vectors. This library is also included in the Draft module.

API Functions
The complete API documentation of FreeCAD is located at http://www.freecadweb.org/api/. It contains both C++ and Python APIs, and is not totally well formatted yet, which can be confusing when looking for python-only code. An easier to browse version can be found here. Note that it can be incomplete, since it is updated manually. For more accurate information, browse the modules directly from FreeCAD's Python console.

Advanced modification

 * Start up and Configuration: Startup and command line options
 * Install on Windows: Using the windows installer
 * Compiling FreeCAD on Windows and Compiling FreeCAD on Unix
 * Branding: Simple modifications you can do to the source code to change some aspects of FreeCAD
 * Extra python modules : Extend the FreeCAD python interpreter with these powerful modules!

Python tutorials
These are good generic tutorials, not specific to FreeCAD, that might interest you if you are totally new to python.

Python
 * Official python tutorial - A very complete tutorial for discovering python
 * Non-programmer tutorial for python - an excellent wikibook
 * Python for newbies - one big tutorial covering all the basics

PySide - How to create and manage FreeCAD's Qt UI interface from python
 * PySide tutorial : A platform-agnostic tutorial showing the usage of PySide with examples
 * PySide/PyQt tutorial : A easy to read tutorial that covers PySide and PyQt with examples
 * PySide documentation : from the Qt Project (the people who wrote it all)
 * Using QtCreator in PySide : also from the Qt Project
 * PySide reference : endless detail on the minutiae of PySide and Qt, a reliable reference source
 * PySide code snippets : a searchable database of PySide code snippets

The following two references are PyQt specific (not PySide) but may offer some information of use:
 * Basic PyQt tutorial : A simple and short linux-based tutorial that will explain how to work with PyQt and Qt Designer
 * Programming Qt applications in python : A more in-depth tutorial covering all the process of working with qt and python.

Pivy - How to interact with FreeCAD's 3D scenes
 * Basic Pivy tutorial : A very simple tutorial from the official Pivy site
 * Introducing Pivy into studierstube : A document that is not really a tutorial, but that illustrates well how Pivy works

Community projects
On the Community portal, you can find other FreeCAD-based projects run by the FreeCAD users community. If you are starting a new FreeCAD project, be sure to list it there! We also have a page with things you can do if you would like to Help FreeCAD.