X-Git-Url: http://git.salome-platform.org/gitweb/?a=blobdiff_plain;f=src%2FSMESHUtils%2FSMESH_MeshAlgos.hxx;h=51cc8dd3d98053f244c711b5899dcf56e2f5bee9;hb=2a5ef76d25b4416b4abcd7e968586423b06b3eb4;hp=3b1097a66002f67e43fb836fa4caf53d63f04e42;hpb=b7a7d49664daa32e1befb558280e13ed0bde37c9;p=modules%2Fsmesh.git diff --git a/src/SMESHUtils/SMESH_MeshAlgos.hxx b/src/SMESHUtils/SMESH_MeshAlgos.hxx index 3b1097a66..51cc8dd3d 100644 --- a/src/SMESHUtils/SMESH_MeshAlgos.hxx +++ b/src/SMESHUtils/SMESH_MeshAlgos.hxx @@ -1,4 +1,4 @@ -// Copyright (C) 2007-2016 CEA/DEN, EDF R&D, OPEN CASCADE +// Copyright (C) 2007-2020 CEA/DEN, EDF R&D, OPEN CASCADE // // Copyright (C) 2003-2007 OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN, // CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS @@ -23,7 +23,7 @@ // Created : Tue Apr 30 18:00:36 2013 // Author : Edward AGAPOV (eap) -// This file holds some low level algorithms extracted from SMESH_MeshEditor +// Initially this file held some low level algorithms extracted from SMESH_MeshEditor // to make them accessible from Controls package, and more @@ -37,14 +37,17 @@ #include "SMESH_TypeDefs.hxx" #include +#include +#include + #include -class gp_Pnt; -class gp_Ax1; class Bnd_B3d; -class SMDS_MeshNode; -class SMDS_MeshElement; +class gp_Ax1; class SMDS_Mesh; +class SMDS_MeshElement; +class SMDS_MeshGroup; +class SMDS_MeshNode; //======================================================================= /*! @@ -184,6 +187,12 @@ namespace SMESH_MeshAlgos SMESHUtils_EXPORT bool FaceNormal(const SMDS_MeshElement* F, gp_XYZ& normal, bool normalized=true); + /*! + * \brief Return number of nodes common to two elements + */ + SMESHUtils_EXPORT + int NbCommonNodes(const SMDS_MeshElement* e1, + const SMDS_MeshElement* e2); /*! * \brief Return nodes common to two elements */ @@ -199,6 +208,21 @@ namespace SMESH_MeshAlgos const SMDS_MeshNode* node0, const SMDS_MeshNode* node1 ); + typedef std::vector< std::vector< const SMDS_MeshElement* > > TElemGroupVector; + typedef std::vector< std::vector< const SMDS_MeshNode* > > TNodeGroupVector; + /*! + * \brief Partition given 1D elements into groups of contiguous edges. + * A node where number of meeting edges != 2 is a group end. + * An optional startNode is used to orient groups it belongs to. + * \return a list of edge groups and a list of corresponding node groups. + * If a group is closed, the first and last nodes of the group are same. + */ + SMESHUtils_EXPORT + void Get1DBranches( SMDS_ElemIteratorPtr edgeIt, + TElemGroupVector& edgeGroups, + TNodeGroupVector& nodeGroups, + const SMDS_MeshNode* startNode = 0 ); + /*! * \brief Mark elements given by SMDS_Iterator */ @@ -247,6 +271,29 @@ namespace SMESH_MeshAlgos MarkElems( (*it)->nodesIterator(), isMarked ); } + // 2 nodes + optional medium node + struct Edge + { + const SMDS_MeshNode* _node1; + const SMDS_MeshNode* _node2; + const SMDS_MeshNode* _medium; + }; + + /*! + * Return sharp edges of faces and non-manifold ones. + * Optionally adds existing edges to the result. Angle is in degrees. + */ + SMESHUtils_EXPORT + std::vector< Edge > FindSharpEdges( SMDS_Mesh* mesh, + double angle, + bool addExisting ); + + /*! + * Distribute all faces of the mesh between groups using given edges. + */ + SMESHUtils_EXPORT + std::vector< std::vector< const SMDS_MeshElement* > > + SeparateFacesByEdges( SMDS_Mesh* mesh, const std::vector< Edge >& edges ); typedef std::vector TFreeBorder; @@ -298,7 +345,6 @@ namespace SMESH_MeshAlgos std::vector& newFaces); // Implemented in ./SMESH_FillHole.cxx - /*! * \brief Find nodes whose merge makes the element invalid */ @@ -309,8 +355,8 @@ namespace SMESH_MeshAlgos // Implemented in SMESH_DeMerge.cxx - typedef std::vector< std::pair< const SMDS_MeshElement*, const SMDS_MeshElement* > > TEPairVec; - typedef std::vector< std::pair< const SMDS_MeshNode*, const SMDS_MeshNode* > > TNPairVec; + typedef std::vector< std::pair< const SMDS_MeshElement*, int > > TElemIntPairVec; + typedef std::vector< std::pair< const SMDS_MeshNode*, int > > TNodeIntPairVec; /*! * \brief Create an offset mesh of given faces * \param [in] faceIt - the input faces @@ -324,20 +370,77 @@ namespace SMESH_MeshAlgos SMDS_Mesh& mesh, const double offset, const bool theFixIntersections, - TEPairVec& new2OldFaces, - TNPairVec& new2OldNodes ); + TElemIntPairVec& new2OldFaces, + TNodeIntPairVec& new2OldNodes ); // Implemented in ./SMESH_Offset.cxx + //======================================================================= + /*! + * \brief Cut faces of a triangular mesh. + * Usage work-flow: 1) call Cut() methods as many times as needed + * 2) call MakeNewFaces() to really modify the mesh faces + */ + //======================================================================= + // implemented in SMESH_Offset.cxx + + class SMESHUtils_EXPORT Intersector + { + public: + Intersector( SMDS_Mesh* mesh, double tol, const std::vector< gp_XYZ >& normals ); + ~Intersector(); + + //! Compute cut of two faces of the mesh + void Cut( const SMDS_MeshElement* face1, + const SMDS_MeshElement* face2, + const int nbCommonNodes = -1 ); + + //! Store a face cut by a line given by its ends lying either on face edges or inside the face. + // Line ends are accompanied by indices of intersected face edges. + // Edge index is <0 if a line end is inside the face. + void Cut( const SMDS_MeshElement* face, + SMESH_NodeXYZ& lineEnd1, + int edgeIndex1, + SMESH_NodeXYZ& lineEnd2, + int edgeIndex2 ); + + //! Split all faces intersected by Cut() methods. + // theSign = (-1|1) is used to choose which part of a face cut by another one to remove. + // 1 means to remove a part opposite to face normal. + // Optionally optimize quality of split faces by edge swapping. + void MakeNewFaces( SMESH_MeshAlgos::TElemIntPairVec& theNew2OldFaces, + SMESH_MeshAlgos::TNodeIntPairVec& theNew2OldNodes, + const double theSign = 1., + const bool theOptimize = false ); + + typedef std::vector< SMESH_NodeXYZ > TFace; + + //! Cut a face by planes, whose normals point to parts to keep. + // Return true if the whole face is cut off + static bool CutByPlanes(const SMDS_MeshElement* face, + const std::vector< gp_Ax1 > & planes, + const double tol, + std::vector< TFace > & newFaceConnectivity ); + + private: + struct Algo; + Algo* myAlgo; + }; + + //======================================================================= /*! * \brief Divide a mesh face into triangles */ + //======================================================================= // Implemented in ./SMESH_Triangulate.cxx class SMESHUtils_EXPORT Triangulate { public: + Triangulate(bool optimize=false); + ~Triangulate(); + static int GetNbTriangles( const SMDS_MeshElement* face ); int GetTriangles( const SMDS_MeshElement* face, @@ -346,25 +449,72 @@ namespace SMESH_MeshAlgos bool triangulate( std::vector< const SMDS_MeshNode*>& nodes, const size_t nbNodes ); - /*! - * \brief Vertex of a polygon. Together with 2 neighbor Vertices represents a triangle - */ - struct PolyVertex - { - SMESH_NodeXYZ _nxyz; - gp_XY _xy; - PolyVertex* _prev; - PolyVertex* _next; - - void SetNodeAndNext( const SMDS_MeshNode* n, PolyVertex& v ); - void GetTriaNodes( const SMDS_MeshNode** nodes) const; - double TriaArea() const; - bool IsInsideTria( const PolyVertex* v ); - PolyVertex* Delete(); - }; - std::vector< PolyVertex > _pv; + struct PolyVertex; + struct Optimizer; + struct Data; + + Data* _data; + Optimizer* _optimizer; + }; + + // structure used in MakePolyLine() to define a cutting plane + struct PolySegment + { + // 2 points, each defined as follows: + // ( myNode1 && myNode2 ) ==> point is in the middle of an edge defined by two nodes + // ( myNode1 && !myNode2 ) ==> point is at myNode1 of a some face + // else ==> point is at myXYZ + const SMDS_MeshNode* myNode1[2]; + const SMDS_MeshNode* myNode2[2]; + gp_XYZ myXYZ [2]; + + // face on which myXYZ projects (found by MakePolyLine()) + const SMDS_MeshElement* myFace [2]; + + // vector on the plane; to use a default plane set vector = (0,0,0) + gp_Vec myVector; + + // point returning coordinates of a middle of the two points, projected to mesh + gp_Pnt myMidProjPoint; }; + typedef std::vector TListOfPolySegments; + /*! + * \brief Create a polyline consisting of 1D mesh elements each lying on a 2D element of + * the initial mesh. Positions of new nodes are found by cutting the mesh by the + * plane passing through pairs of points specified by each PolySegment structure. + * If there are several paths connecting a pair of points, the shortest path is + * selected by the module. Position of the cutting plane is defined by the two + * points and an optional vector lying on the plane specified by a PolySegment. + * By default the vector is defined by Mesh module as following. A middle point + * of the two given points is computed. The middle point is projected to the mesh. + * The vector goes from the middle point to the projection point. In case of planar + * mesh, the vector is normal to the mesh. + * \param [inout] segments - PolySegment's defining positions of cutting planes. + * Return the used vector and position of the middle point. + * \param [in] group - an optional group where created mesh segments will + * be added. + */ + // Implemented in ./SMESH_PolyLine.cxx + SMESHUtils_EXPORT + void MakePolyLine( SMDS_Mesh* mesh, + TListOfPolySegments& segments, + std::vector& newEdges, + std::vector& newNodes, + SMDS_MeshGroup* group=0, + SMESH_ElementSearcher* searcher=0); + + /*! + * Create a slot of given width around given 1D elements lying on a triangle mesh. + * The slot is constructed by cutting faces by cylindrical surfaces made around each segment. + * \return Edges located at the slot boundary + */ + // Implemented in ./SMESH_Slot.cxx + SMESHUtils_EXPORT + std::vector< Edge > MakeSlot( SMDS_ElemIteratorPtr segmentIt, + double width, + SMDS_Mesh* mesh, + std::vector< SMDS_MeshGroup* > & groupsToUpdate); } // namespace SMESH_MeshAlgos