0030151: Modeling Algorithms - Removal of the API level of old Boolean operations algorithm (BRepAlgo_BooleanOperation) The following classes have been removed as obsolete: - BRepAlgo_BooleanOperation - BRepAlgo_Fuse - BRepAlgo_Cut - BRepAlgo_Common - BRepAlgo_Section The corresponding classes from BRepAlgoAPI package have to be used instead. Draw commands: - fuse - cut - common - section/psection have also been removed as obsolete. The corresponding commands for modern Boolean operations algorithm (bfuse/bcut/bcommon/bsection) have to be used instead. Adjustment of the test cases to use the commands for modern algorithm.

0027814: Parallelize BRepCheck_Analyzer Change BRepCheck_Analyzer::Perform algorithm from recursion to 'for' loop Add parallelization to BRepCheck_Analyzer::Perform Add '-parallel' option to checkshape command to use parallelization. Default mode is single-thread. mutex as Handle

0032340: OCCT Documentation - highlight C++ code snippets Added {.cpp} highlighting markers to the C++ code blocks in documentation; Excessive tildes "~~~~~~~" in code block borders are reduced to required minimum of "~~~~" (4); Removed obsolete space bars after code block borders; TCL code blocks are now highlighted with {.php} markers; Removed excessive {.cpp} highlighting markers appended to non-code blocks such as lists, reports and file content or structure examples; Minor fixes for tests.md and draw_test_harness.md (whitespace removal and structural fix for "Where:" in code examples); Minimum HDD space for OCCT updated in introduction.md.

0027191: Documentation - redesign of information architecture -- revision (user guides) Revision of User Guides - Changes in User Guides Section to correspond with OCCT Overview structure: Mesh became a direct subsection of User Guides (it was a part of Modeling Algorithms). TObj is included into OCAF. - Changes in User Guides – Modeling Algorithms section: Fillets and Chamfers, Offsets, Drafts, Pipes and Evolved shapes, Sewing, Features, 3D Model Defeaturing, 3D Model Periodicity, Object Modification are moved into The Topology API section. - Changes in User Guides – Modeling Data section: Naming shapes, sub-shapes, their orientation and state section is renamed to Shape content. Shape Location is moved into Shape content section. Storage of Shapes is moved into BRep Format section of Specification. Lists and Maps of Shapes subsection is moved into Topology - Exploration of Topological Data Structures. - Some pictures in User Guides (Foundation Classes, Modeling Data, Modeling Algorithms) and Tutorial are updated to improve quality and correct mistakes.

0029679: Draw Harness - Command 2dapprox works wrong when giving points in command line Correct the behavior of the command 2dapprox for the case of points input in the command line. Restore the work of the command 2dinterpole (implemented in the same method as 2dapprox). Add test cases. Correct generation of snapshots for the tests lowalgos/2dinter/*.

0030621: Implementation of building U-periodical surfaces. draw_test_harness.md - description of new options in Draw commands AppDef_BSplineCompute.hxx, BRepApprox_TheComputeLineOfApprox.hxx, GeomInt_TheComputeLineOfWLApprox.hxx, Approx_BSplComputeLine.gxx - implementation of method SetPeriodic(...) and implementation periodic boundary conditions for multiline in order to get periodic multicurve. GeomAPI_PointsToBSplineSurface.hxx, GeomAPI_PointsToBSplineSurface.cxx - adding new parameter for methods Init(...) and Interpolate(...), implementation of building periodic tangents for first and last AppDef_MultiPointConstraint of multiline for U direction of surface. GeometryTest_APICommands.cxx - implementation of new functionality in Draw command surfapp and surfint GeomFill_NSections.cxx Fixing problem with bugs modalg_3 bug606_2

0029692: Add functionality to make the group of touching same-dimensional shapes connected Implementation of the new class *BOPAlgo_MakeConnected* for making the group of touching same-dimensional shapes connected. Provide the material association for the first sub-elements of the input shapes. Provide possibility to make the connected shape periodic. Draw commands for new algorithm: * makeconnected - make the input shapes connected or glued, performs material associations; * cmaterialson - returns the materials located on the requested side of a shape; * cmakeperiodic - makes the connected shape periodic in requested directions; * crepeatshape - repeats the periodic connected shape in requested directions requested number of times; * cperiodictwins - returns all periodic twins for the shape; * cclearrepetitions - clears all previous repetitions of the periodic shape, keeping the shape periodic. Documentation & test cases for the new algorithm.

0029683: Add functionality to make the TopoDS_Shape periodic in 3D space Implementation of the new class *BOPAlgo_MakePeriodic* for making the shape periodic in 3D space. Periodicity of the shape means that the shape can be repeated in any periodic direction any number of times without creation of the new geometry or splits. The idea of this algorithm is to make the shape look similarly on the opposite sides or on the period bounds of periodic directions. It does not mean that the opposite sides of the shape will be mirrored. It just means the the opposite sides of the shape should be split by each other and obtain the same geometry on opposite sides. Such approach will allow repeating the shape, i.e. translating the copy of a shape on the period, without creation of new geometry because there will be no coinciding parts of different dimension. Draw commands for the new algorithm: * makeperiodic - makes the shape periodic in required directions; * repeatshape - repeats the periodic shape in requested periodic direction; * periodictwins - returns the periodic twins for the shape; * clearrepetitions - clears all previous repetitions of the periodic shape. Documentation & test cases for the algorithm.

0030145: Modeling Algorithms - Boolean Operations on open solids Provide possibility to perform Boolean operations on open solids. Implementation of the new method *BOPAlgo_Builder::BuildBOP* performing the construction of the result shape for the given type of Boolean operation. This approach does not rely on the splits of solid to be correct and looks for the faces with necessary state relatively opposite solids to build the result solid. The call to this method is performed from BOP algorithm in case there were open solids in the arguments. Implementation of the draw command *buildbop* performing a call to the method above.

0029734: Modeling Algorithms - Compute global properties of tessellated shape New algorithms calculating global properties on mesh data have been added: - BRepGProp_MeshCinert computes the global properties of polylines represented by a set of points; - BRepGProp_MeshProps computes the global properties of a surface mesh. Existing tool BRepGProp now automatically uses new algorithm for triangulation-only faces. By default, algorithm will use exact geometry objects (surfaces), when it is available (as before the patch); this behavior can be switched by a new flag UseTriangulation, forcing usage of triangulation instead of exact geometry when both defined.

0028747: Incorrect result of the section operation after edge refinement Implementation of the method for simplification of the result of Boolean Operation on the API level. The method BRepAlgoAPI_BuilderAlgo::SimplifyResult has been added, so the derived classes such as BooleanOpeation and Splitter can also use this method. The result shape simplification should be called after the operation is done. The simplification is performed by the means of ShapeUpgrade_UnifySameDomain algorithm. Draw command "bsimplify" has been added to control the simplification options. Documentation for new functionality and draw commands controlling the options of Boolean operations. Test cases for the new functionality. Side-effect change: The algorithms in Boolean component have been changed to use the BRepTools_History as a History tool. Now it became possible to disable the collection of shapes modifications during Boolean Operations, which may be useful for performance sake (in draw the option is controlled by *setfillhistory* command). Draw command "unifysamedom" has been changed to accept the angular tolerance in degrees instead of radians.