FreeCAD 0.19 开发者模块指南

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12 CHAPTER 2. ORGANIZATION OF FREECAD SOURCE CODE

• XDGData FreeCAD.desktop ﬁle for linux package compliant Linux freedesktop standard

• WindowsInstaller conﬁg ﬁles to generate windows installer

2.2 List of modules in FreeCAD Mod folder

Mechanical Engineering, CAD and CAM

• Part make primitive 3D objects like cube, cylinder, boolean operation

The Part module is based on the professional CAD kernel , OpenCasCade, objects and functions.

• OpenSCAD Extra OpenCasCade functions

use the high level API in Part module instead

• PartDesign modelling complex solid part from 2D sketch

The Part Design Workbench provides tools for modelling complex solid parts and is based on a Feature editing

methodology to produce a single contiguous solid. It is intricately linked with the Sketcher Workbench.

• Draft draw and modify 2D objects, traditional 2D engineering drawing,

The Draft workbench allows to quickly draw simple 2D objects in the current document, and oﬀers several tools to

modify them afterwards. Some of these tools also work on all other FreeCAD objects, not only those created with

the Draft workbench. It also provides a complete snapping system, and several utilities to manage objects and

settings.

• Drawing put 3D model to paper, can save to DXF and SVG format

• Sketcher build up 3D part from 2D sketch used in PartDesign

• Assembly Assembly of part

Constraint of

• Cam Computer aided machining (CAM), CNC machining

• Path Tool path for CAM

Civil Engineering

• Idf used by Arch module

• Arch CAD for civil engineering, like design of a house

The Arch workbench provides modern BIM workﬂow to FreeCAD, with support for features like IFC support, fully

parametric architectural entities such as walls, structural elements or windows, and rich 2D document production.

The Arch workbench also feature all the tools from the Draft Workbench

• Ship Build 3D model (hull)for ship

Computer aided engineering (CAE)

• Points points cloud from 3D scanning

• ReverseEngineering build 3D part from points cloud

• Raytracing to render lighting 3D model more vivid as in physical world

generate photorealistic images of your models by rendering them with an external renderer. The Raytracing

workbench works with templates, the same way as the Drawing workbench, by allowing you to create a Raytracing

project in which you add views of your objects. The project can then be exported to a ready-to-render ﬁle, or be

rendered directly.

• MeshPart

• Mesh convert part into triangle mesh for rendering (tessellation)

• Fem Fenite element analysis for part design

• Robot Robot simulator

Utilities

• Plot 2D plot,like XYplot, based on matplotlib

allows to edit and save output plots created from other modules and tools

2.3. BUILD SYSTEM FOR FREECAD 13

• Image import various image format, draw them in 3D plane

• Spreadsheet Excel like data view widget

Testing facility

• Inspection Testing

• Test Workbench for self testing

• Sandbox Testing

Meta workbench

• Web web view of FreeCAD

• Start start page of FreeCAD

• Complete show all toolbar from loadable modules

Module not visible to workbench users

• Import

• JtReader

• Material deﬁne standard material property, like density, elastic modulus

not visible to workbench users, used by Fem module

• TemplatePyMod a collection of python example DocumentObject, ViewProvider

2.3 Build System for FreeCAD

2.3.1 Introduction to CMake

CMake is the cross-platform build tool for FreeCAD. Along with generating the make ﬁles that are used to build FC, it also

generates the installer for Windows, the DEB/RPM packages for Linux, and an image bundle MacOS X.

See Appendix 2 cmake cheatsheet for a quick start on CMake.

2.3.2 CMake in FreeCAD

The project top level

CMakeLists.txt

at the repository root is very long, detecting third party library detection and

dealing compiler and OS diﬀerences. In contrast, src/CMakeLists.txt in the source tree is the much shorter, with

add_directory(subfolder_name).

CMake folder in the repo root is ﬁlled with *.cmake ﬁles to detect libraries. If a new workbench with c++ code is added, then

CMake’s third parties detection cmake ﬁle is probably needed.]

set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cMake")

The following hypothetical code demonstrates how we can specify with CMake to not build OpenFOAM from source but

instead we can just install as a binary. The same can be done for other dependencies like other FEM meshing tools like

netgen, and gmsh.

if(NOT MSVC)

OPTION(BUILD_FEM_FOAM "Build the FreeCAD FEM module with the OpenFOAM CFD solver" ON)

else

OPTION(BUILD_FEM_FOAM "Build the FreeCAD FEM module with the OpenFOAM CFD solver" OFF)

endif(NOT MSVC)

Examining further, we can see the following in the the toplevel CMake ﬁle src/CMakeLists.txt

# -------------------- OpenFOAM --------------------

if (BUILD_FEM_FOAM)

find_package(FOAM)

endif(BUILD_FEM_FOAM)

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