9a9242817d
This patch fixes crashes that we've noticed during migration from Qt5 to Qt6 in recent months. If you select items in a tree in a specific direction or range (all, or from bottom to top) and delete them, there is a high change user will experience a crash in `testStatus` function. This problem arises because we're getting into use-after-free situation. Looking at the callstack there are a lot of calls to `itemSelectionChanged` during deletion, which takes over item creation after deletion in `TreeWidget::_slotDeleteObject`. This in turn causes `DocumentObjectItem::testStatus` to be called prematurely when we have dangling pointers in object map still. `itemSelectionChanged` signal is being transmitted because the selection range is changing as we're constantly deleting and readding certain items. Previously there was `blockSelection` call during deletion, but it turns out the signals can still be emitted even AFTER we delete the item. This had to somehow change between Qt5 and Qt6. So, to be safe, move the signal block for selection before the obj deletion loop to be sure we won't retransmit this signal during an uncertain state.
Your own 3D parametric modeler
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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 to change its parameters.
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Create 3D from 2D and back FreeCAD lets 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, programmer, experienced CAD user, student or teacher.
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Cross platform FreeCAD runs on Windows, macOS and Linux operating systems.
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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 packages for stable releases are available for Windows, macOS and Linux on the Releases page.
On most Linux distributions, FreeCAD is also directly installable from the software center application.
For development releases visit the weekly-builds page.
Other options are described on the wiki Download page.
Compiling
FreeCAD requires several dependencies to correctly compile for development and production builds. The following pages contain updated build instructions for their respective platforms:
Reporting Issues
To report an issue please:
- Consider posting to the Forum, Discord channel, or Reddit to verify the issue;
- Search the existing issues for potential duplicates;
- Use the most updated stable or development versions of FreeCAD;
- Post version info from
Help > About FreeCAD > Copy to clipboard; - Restart FreeCAD in safe mode
Help > Restart in safe modeand try to reproduce the issue again. If the issue is resolved it can be fixed by deleting the FreeCAD config files. - Start recording a macro
Macro > Macro recording...and repeat all steps. Stop recording after the issue occurs and upload the saved macro or copy the macro code in the issue; - Post a Step-By-Step explanation on how to recreate the issue;
- Upload an example file (FCStd as ZIP file) to demonstrate the problem;
For more details see:
Note
The FPA offers developers the opportunity to apply for a grant to work on projects of their choosing. Check jobs and funding to know more.
Usage & Getting Help
The FreeCAD wiki contains documentation on general FreeCAD usage, Python scripting, and development. View these pages for more information:
The FreeCAD forum is a great place to find help and solve specific problems when learning to use FreeCAD.
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