![]() However, if you would like to develop applications that use OCCT, or would like to contribute C++ code to FreeCAD, then you need to install the development files of OCCT. OpenCASCADE is a core component of FreeCAD, so if you get FreeCAD from one of the links in the Download page, you will have it installed, and no further installation is necessary. OpenCASCADE is free software governed by the terms of the GNU Lesser General Public License (LGPL) version 2.1 with an additional exception. OpenCASCADE should not be confused with OpenSCAD, which is a different open source project to build 3D models, and which is accessible through the OpenSCAD Workbench. OpenCASCADE provides the basic geometrical classes and drawing functions to the Part module, which are then used by all workbenches in FreeCAD. It also provides internal functions to read and write different file formats like STEP and IGES, and to perform 2D projections, which can be used to create technical drawings in TechDraw. The geometrical classes of OCCT are mostly implemented and made available in FreeCAD through the Part module, on which most other workbenches depend. OpenCASCADE is the heart of the geometrical capabilities of FreeCAD. OpenCASCADE Technology, OCC or OCCT for short, is a collection of C++ libraries that together constitute a professional computer aided design (CAD) kernel for modelling 2D and 3D objects, and building specialized tools for manufacturing, simulation, or visualization.
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