964a2c75df
Introduce always-populated weight arrays in BSpline/Bezier curve and surface classes using non-owning views over a static unit-weights buffer. Migrate ~100 callers across the codebase from deprecated copy-out APIs to direct const-reference array access. Fix a long-standing typo bug in Hermit.cxx. Infrastructure (BSplCLib, BSplSLib): - Add BSplCLib::UnitWeights(n) returning a non-owning NCollection_Array1 view over a compile-time-initialized static array of 2049 ones; falls back to heap allocation for larger sizes. - Add BSplCLib::MaxUnitWeightsSize() (constexpr 2049) and BSplCLib::UnitWeightsData() exposing the raw pointer for BSplSLib. - Add BSplSLib::UnitWeights(nU, nV) returning a non-owning NCollection_Array2 view when nU*nV <= 2049, heap-allocated otherwise. Always-populated myWeights (Geom/Geom2d curve and surface classes): - myWeights is now always sized to match poles count. Non-rational: non-owning view via UnitWeights (zero allocation). Rational: owning array with actual weight values. - Add WeightsArray() returning const NCollection_Array1<double>& (curves) or const NCollection_Array2<double>& (surfaces) that is always valid. - Update all constructors, copy constructors, and restructuring operations (IncreaseDegree, InsertKnots, RemoveKnot, Segment, SetPeriodic, SetOrigin, SetNotPeriodic, ExchangeUV, etc.) to maintain the invariant. - SetWeight: copies non-owning view to owned array before mutation when transitioning to rational; assigns UnitWeights when becoming non-rational. - Remove myRational derivation from myWeights.Size() in updateKnots(); rationality is now tracked explicitly via the myRational flag only. - Fix Geom2d_BSplineCurve::InsertPoleAfter missing myRational update after inserting a weighted pole. - Fix Geom_BSplineCurve::DumpJson stale myWeights.Size() > 0 guard (changed to myRational, matching all other classes). Caller migration to direct array access (~100 files): - Replace deprecated copy-out pattern (allocate temp + call Foo(temp)) with const-reference access for Poles(), Knots(), Multiplicities(), UKnots(), VKnots(), UMultiplicities(), VMultiplicities(), KnotSequence(), UKnotSequence(), VKnotSequence(). - Replace Weights() null-pointer patterns with WeightsArray() const-ref or *Weights() dereference where null check is still appropriate. - Affected modules: GeomConvert, Geom2dConvert, GeomLib, GeomFill, ProjLib, ShapeUpgrade, ShapeCustom, ShapeConstruct, ShapeAnalysis, ShapeAlgo, BRepLib, BRepGProp, HLRBRep, ChFi3d, ChFiKPart, BlendFunc, FairCurve, IntTools, TopOpeBRepTool, TopOpeBRepBuild, LocOpe, BRepOffset, Adaptor3d, GeomAdaptor, Geom2dAdaptor, BndLib, Extrema, DrawTrSurf, GeometryTest, GeomliteTest, SWDRAW, QABugs, GeomToIGES, IGESToBRep, GeomToStep, StdPrs. Bug fix in Hermit.cxx (PolyTest, both 3D and 2D overloads): - Fix typo: "Pole0 < 3" changed to "Pole0 < Pole3" — was comparing a double variable against the integer literal 3 instead of the variable Pole3 holding the endpoint weight value. - Fix logic: "if (boucle == 1)" changed to "else if (boucle == 1)" to make the boucle==1 and boucle==2 branches mutually exclusive. - Add explanatory comments on BSplCLib::D1 calls that intentionally pass weight values as scalar "poles" to evaluate the weight function. NCollection_PackedMapAlgo migration (TDataStd, QABugs): - Replace deprecated member functions (IsSubset, Subtraction, Subtract, Unite, Intersect, IsEqual) with NCollection_PackedMapAlgo free functions. GTests: - New BSplCLib_Test.cxx: 5 tests for UnitWeights API. - New BSplSLib_Test.cxx: 5 tests for surface UnitWeights API. - New Hermit_Test.cxx: 11 tests for Hermit::Solution (3D/2D) and Hermit::Solutionbis covering uniform, distinct, high-ratio, reversed, symmetric weights and positive-poles invariant. - Add WeightsArray tests to Geom_BSplineCurve_Test, Geom_BezierCurve_Test, Geom_BSplineSurface_Test, Geom_BezierSurface_Test (2 tests each) verifying const-ref return, non-owning for non-rational, owning for rational.
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: