2dcf137910
Eliminate virtual dispatch for elementary geometry evaluation in GeomAdaptor_Curve, GeomAdaptor_Surface, and Geom2dAdaptor_Curve by storing gp_* primitives directly in std::variant and calling ElCLib/ElSLib static methods instead of going through virtual myCurve->D0()/mySurface->D0() calls. Extend CurveDataVariant/SurfaceDataVariant with elementary types: - GeomAdaptor_Curve: gp_Lin, gp_Circ, gp_Elips, gp_Hypr, gp_Parab - GeomAdaptor_Surface: gp_Pln, gp_Cylinder, gp_Cone, gp_Sphere, gp_Torus - Geom2dAdaptor_Curve: gp_Lin2d, gp_Circ2d, gp_Elips2d, gp_Hypr2d, gp_Parab2d The load() method now extracts and stores the gp_* primitive at construction time. D0-DN methods dispatch via switch on the curve/surface type enum, calling ElCLib/ElSLib directly for elementary types. Accessor methods (Line(), Circle(), Plane(), etc.) return from the variant when available, avoiding repeated downcasts. Mark every override method as final on all 29 concrete (leaf) classes in Geom_* and Geom2d_* hierarchies. These classes have no subclasses, so final enables compiler devirtualization and clearly documents the design intent. Affected methods include D0-DN, Reverse, Transform, Copy, DumpJson, and all other overridden virtuals. Fix ShallowCopy in GeomAdaptor_Curve and GeomAdaptor_Surface where elementary gp_* types stored in the variant were not copied to the new object, which would cause std::bad_variant_access on first evaluation of the copy.
Open CASCADE Technology
Open CASCADE Technology (OCCT) is a software development platform providing services for 3D surface and solid modeling, CAD data exchange, and visualization. Most of OCCT functionality is available in the form of C++ libraries. OCCT is ideal for developing software dealing with 3D modeling (CAD), manufacturing/measuring (CAM), or numerical simulation (CAE).
License
Open CASCADE Technology is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License version 2.1 as published by the Free Software Foundation, with a special exception defined in the file OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in the OCCT distribution for the complete text of the license.
Alternatively, Open CASCADE Technology may be used under the terms of the Open CASCADE commercial license or a contractual agreement.
Note: Open CASCADE Technology is provided on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND. The entire risk related to any use of the OCCT code and materials is on you. See the license text for a formal disclaimer.
Packaging
You can receive certified versions of OCCT code in different packages:
- Snapshot of Git repository: Contains C++ header and source files of OCCT, documentation sources, build scripts, and CMake project files.
- Complete source archive: Contains all sources of OCCT, generated HTML and PDF documentation, and ready-to-use projects for building on all officially supported platforms.
- Binary package (platform-specific): In addition to the complete source archive, it includes binaries of OCCT and third-party libraries built on one platform. This package allows using OCCT immediately after installation.
Certified versions of OCCT can be downloaded from:
You can also find OCCT pre-installed on your system or install it from packages provided by a third party. Note that packaging and functionality of such versions can be different from certified releases. Please consult the documentation accompanying your version for details.
Documentation
Documentation is available at the following links:
Documentation can be part of the package. To preview documentation as part of the package, open the file doc/html/index.html to browse HTML documentation.
If HTML documentation is not available in your package, you can:
- Generate it from sources: You need to have Tcl and Doxygen 1.8.4 (or above) installed on your system and accessible in your environment (check the environment variable PATH). Use the batch file
adm/gendoc.baton Windows or the Bash scriptadm/gendocon Linux or OS X to (re)generate documentation. - Generate together with sources: You need to have CMake and 1.8.4 (or above) installed on your system. Enable
BUILD_DOC_OverviewCMake parameter and set the path to Doxygen3RDPARTY_DOXYGEN_EXECUTABLE. Then build ALL or onlyOverview. - Read documentation in source plain text (Markdown) format found in the subfolder
doxor GitHub Wiki.
See dox/build/build_documentation/building_documentation.md or Building Documentation for details.
Building
In most cases, you need to rebuild OCCT on your platform (OS, compiler) before using it in your project to ensure binary compatibility.
Consult the file dox/build/build_occt/building_occt.md or Building OCCT or Building OCCT Wiki for instructions on building OCCT from sources on supported platforms.
Version
The current version of OCCT can be found in the file adm/cmake/version.cmake.
Development
Bug Tracker
For information regarding OCCT code development, please consult the official OCCT Collaborative Development Portal: