03c3539dbf
================================================== The solver uses some heuristics to determine the "redundant to remove" and notify it to the user. Basically it would pick the solver redundant constraint that affects most groups of redundants (popularity contest). In the simple cases, all the redundants are equally popular and the popularity contest is untied by using the tagid (let say for simplicity it is the number at sketcher level Constraint3, the tagid=3). This means that in simple cases, the solver systematically decides that the redundant constraint to handle from those showing a linear dependency is the one appearing the last. This commits changes the way to untie the popularity contest, by giving more priority to those sketcher constraints that need a lower number of solver constraints (in other words, those constraints that remove a lower amount of DoF). In case of tie, the tagid is then used to break the tie. At least: fixes #3434 fixes #1557
FreeCAD
FreeCAD is a general purpose feature-based, parametric 3D modeler for CAD, MCAD, CAx, CAE and PLM, aimed directly at mechanical engineering and product design but also fits a wider range of uses in engineering, such as architecture or other engineering specialties. It is 100% Open Source (LGPL2+ license) and extremely modular, allowing for very advanced extension and customization.
FreeCAD is based on OpenCASCADE, a powerful geometry kernel, features an Open Inventor-compliant 3D scene representation model provided by the Coin 3D library, and a broad Python API. The interface is built with Qt. FreeCAD runs exactly the same way on Windows, Mac OSX, BSD and Linux platforms.
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 | 0.16 | 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.