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DocumentObject: * getSubObject(): the most important API for Link to work with hierarchies. The function is a inspired from and replaces the getPySubObjects(). It returns a child object following a dot separated subname reference, and can optionally return accumulated transformation, and/or a python object of the refered sub-object/element. The default implementation here is to look for link type property, and search for the referenced object. This patch also include other specialized implementation of this API, such as (GeoFeature)GroupExtension (through extensionGetSubObject()), PartDesign::Body, and so on. A link type object is expected to call the linked object's getSubObject() for resolving. * getSubObjectList(): helper function to return a list of object referenced in the given subname. * getSubObjects(): return a list of subname references of all children objects. The purpose of this function is similar to ViewProvider::claimChildren(). Container type object is expected to implement this function. The reason it returns subname references instead of just object is to allow the container to skip hierarchies. For example, the Assembly3 container uses this to skip the constraint and element group. * getLinkedObject(), obtain the linked object, and optionally with the accumulated transformation. It is expected to return a linked object or the object itself if it is not a link. In case there are multiple levels of linking involved, this function allows the caller to retrieve the linked object recursively. * hasChildElement(), set/isElementVisible(), controls the children visibility for a group type object. Because the child object may be claimed by other objects, it is essential to have independent control of children visibilities. These APIs are designed to abstract how group manages the child visibility. For performance reason, these function are meant to control only the immediate child object. * resolve(), helper function to parse subname reference and resolve the final object, and optionally the immediate parent of the final object, the final object reference name (for calling `set/isElementVisible()`), and the subname reference if there is one. * touch(), add optional argument 'noRecompute' for better backward compatibility with the NoRecompute flag. By default, touch() causes recompute unless noRecompute is true * signalChanged/signalBeforeChange, two new signal for tracking changes of a specific object. * getViewProviderNameOverride(), return a string of the view provider type of this object. This allows Python class to override the view provider of an object. This feature will be used by ViewProviderLink which is designed to work with any object that has LinkBaseExtension. * canLinkProperties(), will be used by Gui::PropertyView to display linked object properties together with the object's own properties. * redirectSubname(), will be used by Gui::Tree to allow an object to redirect selection to some other object when (pre)selected in the tree view. * Visibility, new property serve as the same purpose as view provider property of the same name. It is added here so that App namespace code can check for visibility without Gui module. This is useful, for example, when constructing a compound shape of a container that respects the children visibility. * (has)hasHiddenMarker(), return or check for a special sub-element name used as marker for overriding sub-object visibility. Will be used by Gui::ViewProvider, it is put here for the same reason as adding Visibility property. * getID(), return object internal identifier. Each object is now assigned an integer identifier that is unique within its containing document. Document: * ShowHidden, new property to tell tree view whether to show hidden object items. * signalTouchedObject, new signal triggered when manually touch an object when calling its touch() function * getObjectByID(), get object by its identifier * addObject() is modified to allow overriding view provider * has/getLinksTo(), helper function to obtain links to a given object. Application: * checkLinkDepth(), helper function to check recursive depth for link traversal. The depth is checked against the total object count of all opened documents. The count (_objCount) is internally updated whenever object is added or removed. * has/getLinksTo(), same as Document::has/getLinksTo() but return links from all opened documents. GroupExtension/OriginGroupExtension/DatumFeature/DatumCS/Part::Feature: implement sepcialized getSubObject/getSubObjects().
Your own 3D parametric modeler
Website • Documentation • Forum • Bug tracker • Git repository
Overview
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Freedom to build what you want FreeCAD is an open-source parametric 3D modeler made primarily to design real-life objects of any size. Parametric modeling allows you to easily modify your design by going back into your model history and changing its parameters.
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Create 3D from 2D & back FreeCAD allows you to sketch geometry constrained 2D shapes and use them as a base to build other objects. It contains many components to adjust dimensions or extract design details from 3D models to create high quality production ready drawings.
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Designed for your needs FreeCAD is designed to fit a wide range of uses including product design, mechanical engineering and architecture. Whether you are a hobbyist, a programmer, an experienced CAD user, a student or a teacher, you will feel right at home with FreeCAD.
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Cross platform FreeCAD runs on Windows, Mac and Linux
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Underlying technology
- OpenCASCADE A powerful geometry kernel, the most important component of FreeCAD
- Coin3D library Open Inventor-compliant 3D scene representation model
- Python FreeCAD offers a broad Python API
- Qt Graphical User Interface built with Qt
Installing
Precompiled (installable) packages are available for Windows and Mac on the Releases page.
On most Linux distributions, FreeCAD is directly installable from the software center application.
Other options are described at the wiki Download page.
Build Status 
| Master | 0.18 | Translation |
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Compiling
Compiling FreeCAD requires installation of several libraries and their development files such as OpenCASCADe, Coin and Qt, listed in the pages below. Once this is done, FreeCAD can be simply compiled with cMake. On Windows, these libraries are bundled and offered by the FreeCAD team in a convenient package. On Linux, they are usually found in your distribution's repositories, and on Mac OSX and other platforms you will usually need to compile them yourself.
The pages below contain up-to-date build instructions:
Usage & Getting help
The FreeCAD wiki contains documentation on general FreeCAD usage, Python scripting, and development. These pages might help you get started:
The FreeCAD forum is also a great place to find help and solve specific problems you might encounter when learning to use FreeCAD.