Release notes 0.19

 Are features missing? Mention them in the Release notes for v0.19 forum thread.

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FreeCAD 0.19 was released on DD Month 2020, get it from the Download page. This is a summary of the most interesting changes. The complete list of changes can be found in the MantisBT bugtracker FC 0.19 changelog.

Older FreeCAD release notes can be found in Feature list.



Simpson and Shipton short stroke steam engine circa 1845, using horizontal rotating piston, by "un1corn", Users Showcase.

Highlights


Horizontal 4 cylinder rotary valve steam engine, by "un1corn", Users Showcase.



Preliminary design of MAORY, an adaptive optics (AO) module for the European Extremely Large Telescope (E-ELT); here it is mounted on the E-ELT Nasmyth platform.

''This assembly was made by "Zolko", author of the new Assembly4 Workbench, which uses the new powerful App::Link object to import thousands of different parts and subassemblies, arranging them in specified positions by means of mathematical expressions. See Users Showcase.''

For this model, the parts were not designed in FreeCAD, they were just imported in STEP format, and subsequently arranged with Assembly4.



Add a high quality image here that highlights a development in FreeCAD 0.19, with its author, and link to the image's origin.



Add a high quality image here that highlights a development in FreeCAD 0.19, with its author, and link to the image's origin.

General
With more than 3000 commits in the master branch since the 0.18 release, this is one of the most extensive releases ever, with several new components like the new "App::Link" object, as well as many new tools in the TechDraw Workbench that make FreeCAD even more powerful for 3D solid modelling and assembly. Beside that, the FreeCAD ecosystem has continued to grow with more specialized external workbenches.

Python 3 and Qt5
The effort to migrate from Python 2 and Qt4 to Python 3 and Qt5 is essentially complete and most developers have moved to the Python3/Qt5 toolchains.

Undoubtedly there are unforeseen bugs; these will be addressed as they are reported. Any existing dependence on Python 2 or Qt4 will not be supported beyond 1st January 2020 when Python 2 officially became unsupported by the Python Foundation. Please note that certain addons have not been ported yet to Python3/Qt5. This may be due to several reasons including lack of time by their developers, or broken dependencies that may not be easily fixed, or simply because the addon is considered obsolete. Individuals interested in the migration of a particular workbench or tool are encouraged to participate in the FreeCAD forum; see also, Python3 and Qt5 Compatible Addon Workbenches (in preparation for 0.18).

Some issues
Fixed issue with Std Part containers visibility when the viewport is displayed in full screen in Qt5:
 * Set for Qt 5.9 and above; forum discussion, commit 2a1dd8415, and commit 57b3ca6f77.
 * Disabled button support in  for Qt5 to avoid MDI view mode-related rendering artifacts; forum discussion, commit 960d612547.
 * Fixed bug in to avoid a crash when returning from full screen; forum discussion, commit c4e34ed9b.
 * Fixed issue #4088 about the visibility of the origin of a Part changing when undocking the 3D view; forum discussion, commit 1e19ef5be.
 * Fixed issue #3130 about Qt5 bugs when using a high resolution external monitor; forum discussion, commit 2f2d505359.

Development

 * Merged QtWebEngine support; pull request #1937.
 * New Libpack for Windows with Qt 5.12, OCC 7.3 and Python 3.6; forum discussion.
 * Added support for existing Python virtual environments; pull request #2021.
 * Fixed broken support for "INCH" units when exporting to STEP/IGES formats; forum discussion, commit 1b26173580.
 * Improved import/export compatibility with proprietary CAD systems, when using compressed STEP, or STPZ; forum discussion, pull request #2323, commit 7de89cf62e.
 * Pre-select name filter in the import/export dialog; forum discussion, commit e239994,
 * Fixed missing application ID and icon on GNOME/Wayland; pull request #2466.
 * Added support for Hertz as a physical unit, and added the Frequency property; forum discussion, commit 3500451a0, commit d7ca604c9.

Documentation

 * The Compile on Linux/Unix page was reviewed to better explain the requisites to compile on different Linux distributions. As many developers use Debian based systems, this section received the most attention. Users of other Linux distributions are encouraged to maintain the documentation for their particular distribution. Compile on Windows was also rewritten to explain how to use the LibPack for compilation.
 * The Source documentation page also received a clean-up to better explain how to produce the programming (API) documentation from C++ and Python sources.
 * The Doxygen page was reviewed and extended to give more details about the syntax that is used in C++ files to produce the programming documentation.
 * The Source code management page was also reworked with better descriptions and examples of using to manage branches and contribute code.
 * The External workbenches page was re-organized, so that all feature-rich, publicly available workbenches are listed. If you'd like to add a workbench to this page, showcase it in the forum, and provide supporting information like user manual, wiki pages, and a link to its repository. Then push for it to be included in the Addon Manager.
 * There have been improvements to the Tutorials and Video tutorials pages. In particular, it has been stressed to readers that they should consider only video tutorials that are made with versions 0.17 or above.

Known Limitations

 * Black screen due to video card drivers, while running FreeCAD inside a virtual machine; issue #3939.
 * Logitech Wingman USB joystick can cause erratic behavior when spinning and zooming in the view; forum discussion.
 * Gesture navigation is fully supported for Windows but yet to be maintained in Linux and MacOS. Problem: the developer, DeepSOIC, doesn't have a MacOS machine with its special trackpad, and hasn't tested it on Linux either; forum discussion.

App::Link and assembly


After 2.5 years in development, the "Link" object, or more formally, was introduced in FreeCAD. This is a special type of with certain properties that will hopefully allow for doing assemblies easier.

A "Link" allows objects to use another object's data, such as geometry or even their 3D visual representation, in the same or different files. It can be thought of as a thin, absolute clone, or as the same object living into two different "instances". Some functionality offered by a "Link" is already present in some workbenches like Arch and BIM (clones, external references), but the "Link" implementation is at the core level, and thus can be used by all workbenches in different ways.

The "Link" component was thought and developed almost single-handedly by user. The motivations and design implementations behind this project are described in his GitHub page, Link. In order to accomplish this feature, several core changes to FreeCAD were made; these are also extensively documented in Core-Changes.

The history of "Link" can be traced to some essential forum threads:
 * Why an object can only be inside one App::Part? (March 2017)
 * Introducing App::Link/XLink (March 2017)
 * Links (May 2017)
 * Realthunder Link implementation: Architecture discussion (June 2017)
 * PR #876: Link, stage one, context aware selection (July 2017)
 * Preview: Link, stage two, API groundwork (July 2017)
 * Assembly3 preview (December 2017)
 * Merging of my Link branch (June 2018)

Finally, the pull request and merge happened:
 * App::Link: the big merge, old thread (July 2019), pull request #2350 (the BIG merge), LinkMerge branch.
 * App::Link: the big merge, main thread (July 2019)
 * A simple path description of Link, 019, Link stage, Asm3, merge? (August 2019)
 * PR#2559: expose link and navigation actions, an introduction to the Link feature in 0.19 (September 2019).

The "Link" object prepares FreeCAD for the phase that was scheduled to happen after the redesign of PartDesign in FreeCAD 0.17, which is working with assemblies.

"Assembly3" is an assembly workbench written in Python by realthunder, that makes use of the "Link" functionality. The workbench served as a testbed for the "Link" component during its development. While Assembly3 is still not officially part of FreeCAD, with the inclusion of "Link", it is a matter of time for Assembly3 to be provided as an installable add-on, just like A2plus Workbench is provided currently.

Other additions in the App::Link merge
Beside the introduction of "App::Link", the "LinkMerge" branch also introduced some changes visible to the user with regards to object properties, expressions, visual selection, and the tree view. These are described in the Core-Changes page.

Further Draft Improvements

 * The Draft Wire tool now is called "Polyline" in the menu, instead of "DWire"; all options and functionality remain the same, so this doesn't break compatibility; commit 39e748229e.
 * Undergoing efforts to split tools into their own module files to ease maintenance of the codebase for the future; forum discussion, commit 16c26cb3b1.
 * Reorganization of some functions and classes to improve management of the code in separate modules; pull requests #2823 (GuiCommandBase), #2829 (utilities), #2830 (GUI utilities), #2831 (ToDo class), #2832 (translate function).
 * Undergoing efforts to document the Python source code (adding complete docstrings), in order to produce better programming documentation that can be used by both users and developers. See Source documentation for instructions on generating the documentation with Doxygen.
 * A "DraftEditPickRadius" preference was added to control the area of influence of the pointer when picking vertices in edit mode (Draft Edit). Forum discussion, pull request #2642, issue #4162.

Further FEM Improvements

 * Updated coding standards that strive for PEP8 compliance with Python; forum discussion, commit ad03ee9bdf, commit 27cb54009b.
 * The Elmer project has developed a library for handling batch type pre-processing for the ElmerSolver, using the FEM Workbench. This includes creating mesh objects for FreeCAD, manipulating the mesh sizes of solids, creating finite element meshes using Gmsh, running ElmerGrid and exporting the mesh for ElmerSolver, and selecting and naming bodies and boundaries for ElmerSolver; forum discussion, elmerfem repository (Elmer main repository), FreeCADBatchFEMTools repository (library to interact with FEM Workbench, LGPL 2.1).
 * The integration of the OOFem solver, which started in 2018, is progressing, so it is now another option that can be used for structural analysis in FreeCAD. This solver is interesting in that it has interface elements, as well as arc-length control, in addition to many non-linear material models. The integration of OOFEM into FEM has been carried in various commits that together serve as documentation on how to integrate similar solvers; forum discussion, femoofem branch, OOFEM main website, oofem repository (LGPL 2.1).

Part Workbench

 * New Face method: to cut holes into a face. The face usually needs to be validated after operation.
 * The "App::Link" merge introduced two new commands, Part TransformedCopy and Part ElementCopy. These commands create non-parametric copies of a body with a transformed placement, and of an element (vertex, edge, or face); commit 6da72b9859. These operations essentially make the Macro Repro Wire obsolete.

PartDesign Workbench

 * Attachment information
 * Multiple selections

Path Workbench

 * Added Path DressupBoundary for excluding parts of a path

Further Path Improvements

 * Fixed issue #3993, Python 3 memory leak; forum discussion, commit 3c205946e.
 * Ability to use an arbitrary number of an object as the base model for a Path.Job, each one being positionable individually; pull request #2056.

Render Workbench
Added support for Blender's standalone "Cycles" renderer; commit 759067912f; FreeCAD-render repository. The Cycles standalone renderer usually needs to be compiled from source, as the binary is normally not provided by itself in a complete Blender distribution.

Besides this, the Render Workbench already has support for Pov-Ray, Luxrender and Appleseed.

Spreadsheet Workbench
The introduction of "App::Link" also brought some improvements to the Expressions capabilities of FreeCAD, which are visible in the Property editor, and the Spreadsheet Workbench. These are described in Core-Changes.
 * A new expression syntax is introduced to unambiguously reference a property of the owner object, by omitting the object reference and starting with a leading dot, similar to Python relative import syntax. So instead of , now you can use.
 * You can refer to an object by its or by its . In the case of a, it must be enclosed in  and  symbols, such as . For example,.
 * Improved spreadsheet recomputation logic, and cell copy and paste functions.

Further TechDraw Improvements

 * There has been discussions about changing the standard behavior of TechDraw. Instead of keeping the drawing pages updated automatically, they would be updated only on demand; this would mitigate the effects of TechDraw slowing down the rest of FreeCAD when modelling. Moreover, now that "App::Link" is included in FreeCAD, TechDraw pages may be stored in a separate file, and loaded on demand; forum discussion (main discussion), forum discussion (alternatives).
 * Fixed font size issues when exporting to SVG; forum discussion, pull request #2219.
 * Fixed regression in caption handling and hide caption property where not applicable; pull request #2228.
 * Added options for page size, line width and background when saving to SVG; this improves Draft/Arch and TechDraw integration; pull request #2455.
 * New panning of the page using the middle mouse button; forum discussion, pull request #2458.
 * Finer control of drawing updates; forum discussion, pull request #2468, commit 5bed53f858, commit b2d8eeeb65.
 * Also new TechDraw Redraw tool to force a drawing page update while ignoring the state of the options "Update with 3d", "Allow page override", or "KeepUpdated". This tool disappeared in 0.18, but was re-implemented for 0.19; forum discussion.

Macros
See Macros recipes for many more macros.

Additional modules
See external workbenches for the full list of additional workbenches that can be installed in FreeCAD. If you want to see your workbench added, join the forum and present your code.