Manual:The FreeCAD document/zh-cn

• Introduction
• Discovering FreeCAD
  • What is FreeCAD?
  • Installing
    • Installing on Windows
    • Installing on Linux
    • Installing on Mac OS
    • Uninstalling
    • Setting basic preferences
    • Installing additional content
  • The FreeCAD interface
    • Workbenches
    • The interface
    • Customizing the interface
  • Navigating in the 3D view
    • A word about the 3D space
    • The FreeCAD 3D view
    • Selecting objects
  • The FreeCAD document
  • Parametric objects
  • Import and export to other filetypes
• Working with FreeCAD
  • All workbenches at a glance
  • Traditional modeling, the CSG way
  • Traditional 2D drafting
  • Modeling for product design
  • Preparing models for 3D printing
    • Exporting to slicers
    • Converting objects to meshes
    • Using Slic3r
    • Using the Cura addon
    • Generating G-code
  • Generating 2D drawings
  • BIM modeling
  • Using spreadsheets
    • Reading properties
    • Writing properties
  • Creating FEM analyses
  • Creating renderings
• Python scripting
  • A gentle introduction
    • Writing Python code
    • Manipulating FreeCAD objects
    • Vectors and Placements
  • Creating and manipulating geometry
  • Creating parametric objects
  • Creating interface tools
• The community

一份 FreeCAD 文件包含了场景中的所有对象。它可以包含任何工作台所创建的对象或它们的组合。因而你可以在工作台之间自由切换，但是仍在同一份 FreeCAD 文档上工作。当你保存你的工作成果时，这份 FreeCAD 文档便会被保存到磁盘中。可以在 FreeCAD 中同时打开多份文档，也可以为同一份文档开启多个视图。

在文档内部，对象可以移动到群组中，并具有唯一的名称。管理群组，对象和对象名称主要在树视图里完成。在那里，你可以创建群组，将对象移动到群组，删除对象或群组。通过右键单击树视图或对象，可以重命名对象，更改颜色，隐藏或显示它们，或者可能还有其他操作，具体取决于当前的工作台。

FreeCAD文档中的对象可以是不同类型的。每个工作台都可以添加自己的对象类型，例如 Mesh Workbench 添加网格对象，Part Workbench 添加 Part 对象，等等。

If there is at least one document open in FreeCAD, there is always one and only one active document. That's the document that appears in the current 3D view, the document you are currently working on. If you switch tabs to another document, that one becomes the active document. Most operations always work on the active document.

FreeCAD documents are saved with the .FcStd extension, which is a zip-based compound format, similar to LibreOffice. If something goes very wrong, it is often possible to unzip it and fix the problem or rescue the data.

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• The FreeCAD document
• File Format FCStd