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* Nglib now supports surface and volume meshing of OCC geometry

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* OCC code cleanup
* Added to Nglib source code documentation
This commit is contained in:
Philippose Rajan 2009-09-01 21:36:09 +00:00
parent 91ae6c4c70
commit 4a3a49f5fd
5 changed files with 747 additions and 641 deletions
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1094
libsrc/occ/occgenmesh.cpp
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File diff suppressed because it is too large Load Diff

2
libsrc/occ/occgeom.cpp
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@ -1603,8 +1603,6 @@ namespace netgen
return false;
}
extern int OCCGenerateMesh (OCCGeometry & occgeometry, Mesh*& mesh,
int perfstepsstart, int perfstepsend, char* optstring);
int OCCGeometry :: GenerateMesh (Mesh*& mesh,
int perfstepsstart, int perfstepsend, char* optstring)

26
libsrc/occ/occgeom.hpp
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@ -80,6 +80,7 @@
#include "ShapeAnalysis.hxx"
#include "ShapeBuild_ReShape.hxx"
// Philippose - 29/01/2009
// OpenCascade XDE Support
// Include support for OpenCascade XDE Features
@ -164,6 +165,17 @@ namespace netgen
class Line
{
public:
Point<3> p0, p1;
double Dist (Line l);
double Length ();
};
inline double Det3 (double a00, double a01, double a02,
double a10, double a11, double a12,
@ -386,6 +398,20 @@ namespace netgen
OCCGeometry * LoadOCC_BREP (const char * filename);
extern OCCParameters occparam;
// Philippose - 31.09.2009
// External access to the mesh generation functions within the OCC
// subsystem (Not sure if this is the best way to implement this....!!)
extern int OCCGenerateMesh (OCCGeometry & occgeometry, Mesh*& mesh,
int perfstepsstart, int perfstepsend,
char* optstring);
extern void OCCSetLocalMeshSize(OCCGeometry & geom, Mesh & mesh);
extern void OCCMeshSurface (OCCGeometry & geom, Mesh & mesh, int perfstepsend);
extern void OCCFindEdges (OCCGeometry & geom, Mesh & mesh);
}
#endif

216
nglib/nglib.cpp
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@ -27,8 +27,8 @@
namespace netgen {
extern void MeshFromSpline2D (SplineGeometry2d & geometry,
Mesh *& mesh,
MeshingParameters & mp);
Mesh *& mesh,
MeshingParameters & mp);
}
@ -131,7 +131,7 @@ namespace nglib
// Manually add a surface element of a given type to an existing mesh object
DLL_HEADER void Ng_AddSurfaceElement (Ng_Mesh * mesh, Ng_Surface_Element_Type et,
int * pi)
int * pi)
{
Mesh * m = (Mesh*)mesh;
Element2d el (3);
@ -146,7 +146,7 @@ namespace nglib
// Manually add a volume element of a given type to an existing mesh object
DLL_HEADER void Ng_AddVolumeElement (Ng_Mesh * mesh, Ng_Volume_Element_Type et,
int * pi)
int * pi)
{
Mesh * m = (Mesh*)mesh;
Element el (4);
@ -270,8 +270,10 @@ namespace nglib
{
Mesh * m = (Mesh*)mesh;
MeshingParameters mparam;
// Philippose - 30/08/2009
// Do not locally re-define "mparam" here... "mparam" is a global
// object
//MeshingParameters mparam;
mparam.maxh = mp->maxh;
mparam.meshsizefilename = mp->meshsize_filename;
@ -369,9 +371,12 @@ namespace nglib
return (Ng_Geometry_2D *)geom;
}
DLL_HEADER Ng_Result Ng_GenerateMesh_2D (Ng_Geometry_2D * geom,
Ng_Mesh ** mesh,
Ng_Meshing_Parameters * mp)
Ng_Mesh ** mesh,
Ng_Meshing_Parameters * mp)
{
// use global variable mparam
// MeshingParameters mparam;
@ -388,6 +393,9 @@ namespace nglib
return NG_OK;
}
DLL_HEADER void Ng_HP_Refinement (Ng_Geometry_2D * geom,
Ng_Mesh * mesh,
int levels)
@ -396,6 +404,9 @@ namespace nglib
HPRefinement (*(Mesh*)mesh, &ref, levels);
}
DLL_HEADER void Ng_HP_Refinement (Ng_Geometry_2D * geom,
Ng_Mesh * mesh,
int levels, double parameter)
@ -461,12 +472,16 @@ namespace nglib
return geo2;
}
// generate new STL Geometry
DLL_HEADER Ng_STL_Geometry * Ng_STL_NewGeometry ()
{
return (Ng_STL_Geometry*)(void*)new STLGeometry;
}
// after adding triangles (and edges) initialize
DLL_HEADER Ng_Result Ng_STL_InitSTLGeometry (Ng_STL_Geometry * geom)
{
@ -489,10 +504,12 @@ namespace nglib
return NG_SURFACE_INPUT_ERROR;
}
// automatically generates edges:
DLL_HEADER Ng_Result Ng_STL_MakeEdges (Ng_STL_Geometry * geom,
Ng_Mesh* mesh,
Ng_Meshing_Parameters * mp)
Ng_Mesh* mesh,
Ng_Meshing_Parameters * mp)
{
STLGeometry* stlgeometry = (STLGeometry*)geom;
Mesh* me = (Mesh*)mesh;
@ -507,8 +524,8 @@ namespace nglib
me -> SetGlobalH (mparam.maxh);
me -> SetLocalH (stlgeometry->GetBoundingBox().PMin() - Vec3d(10, 10, 10),
stlgeometry->GetBoundingBox().PMax() + Vec3d(10, 10, 10),
0.3);
stlgeometry->GetBoundingBox().PMax() + Vec3d(10, 10, 10),
0.3);
me -> LoadLocalMeshSize (mp->meshsize_filename);
/*
@ -533,8 +550,8 @@ namespace nglib
// generates mesh, empty mesh be already created.
DLL_HEADER Ng_Result Ng_STL_GenerateSurfaceMesh (Ng_STL_Geometry * geom,
Ng_Mesh* mesh,
Ng_Meshing_Parameters * mp)
Ng_Mesh* mesh,
Ng_Meshing_Parameters * mp)
{
STLGeometry* stlgeometry = (STLGeometry*)geom;
Mesh* me = (Mesh*)mesh;
@ -593,7 +610,8 @@ namespace nglib
// positive orientation
// normal vector may be null-pointer
DLL_HEADER void Ng_STL_AddTriangle (Ng_STL_Geometry * geom,
double * p1, double * p2, double * p3, double * nv)
double * p1, double * p2, double * p3,
double * nv)
{
Point<3> apts[3];
apts[0] = Point<3>(p1[0],p1[1],p1[2]);
@ -621,7 +639,6 @@ namespace nglib
#ifdef OCCGEOMETRY
// --------------------- OCC Geometry / Meshing Utility Functions -------------------
@ -632,46 +649,166 @@ namespace nglib
}
// Loads geometry from STEP File
DLL_HEADER Ng_OCC_Geometry * Ng_OCC_Load_STEP (const char * filename)
{
Ng_OCC_Geometry * geo = Ng_OCC_NewGeometry();
geo = (Ng_OCC_Geometry *)LoadOCC_STEP(filename);
OCCGeometry * occgeo = LoadOCC_STEP(filename);
// Create the initial triangulation for the OCC
BRepMesh_IncrementalMesh::BRepMesh_IncrementalMesh(occgeo->shape,0.1);
geo = (Ng_OCC_Geometry *)occgeo;
return (geo);
}
// Loads geometry from IGES File
DLL_HEADER Ng_OCC_Geometry * Ng_OCC_Load_IGES (const char * filename)
{
Ng_OCC_Geometry * geo = Ng_OCC_NewGeometry();
geo = (Ng_OCC_Geometry *)LoadOCC_IGES(filename);
OCCGeometry * occgeo = LoadOCC_IGES(filename);
// Create the initial triangulation for the OCC
BRepMesh_IncrementalMesh::BRepMesh_IncrementalMesh(occgeo->shape,0.1);
geo = (Ng_OCC_Geometry *)occgeo;
return (geo);
}
// Loads geometry from BREP File
DLL_HEADER Ng_OCC_Geometry * Ng_OCC_Load_BREP (const char * filename)
{
Ng_OCC_Geometry * geo = Ng_OCC_NewGeometry();
geo = (Ng_OCC_Geometry *)LoadOCC_BREP(filename);
OCCGeometry * occgeo = LoadOCC_BREP(filename);
// Create the initial triangulation for the OCC
BRepMesh_IncrementalMesh::BRepMesh_IncrementalMesh(occgeo->shape,0.1);
geo = (Ng_OCC_Geometry *)occgeo;
return (geo);
}
// Extract a
//
DLL_HEADER Ng_Result Ng_OCC_SetLocalMeshSize (Ng_OCC_Geometry * geom,
Ng_Mesh * mesh,
Ng_Meshing_Parameters * mp)
{
OCCGeometry * occgeom = (OCCGeometry*)geom;
Mesh * me = (Mesh*)mesh;
mparam.uselocalh = mp->uselocalh;
mparam.maxh = mp->maxh;
mparam.minh = mp->minh;
mparam.segmentsperedge = mp->elementsperedge;
mparam.curvaturesafety = mp->elementspercurve;
mparam.grading = mp->grading;
mparam.meshsizefilename = mp->meshsize_filename;
occparam.resthcloseedgeenable = mp->closeedgeenable;
occparam.resthcloseedgefac = mp->closeedgefact;
delete me;
me = new Mesh;
OCCSetLocalMeshSize(*occgeom, *me);
return(NG_OK);
}
// Mesh the edges and add Face descriptors to prepare for surface meshing
DLL_HEADER Ng_Result Ng_OCC_GenerateEdgeMesh (Ng_OCC_Geometry * geom,
Ng_Mesh * mesh,
Ng_Meshing_Parameters * mp)
{
OCCGeometry * occgeom = (OCCGeometry*)geom;
Mesh * me = (Mesh*)mesh;
mparam.uselocalh = mp->uselocalh;
OCCFindEdges(*occgeom, *me);
if((me->GetNP()) && (me->GetNFD()))
{
return NG_OK;
}
else
{
return NG_ERROR;
}
}
// Mesh the edges and add Face descriptors to prepare for surface meshing
DLL_HEADER Ng_Result Ng_OCC_GenerateSurfaceMesh (Ng_OCC_Geometry * geom,
Ng_Mesh * mesh,
Ng_Meshing_Parameters * mp)
{
int numpoints = 0;
OCCGeometry * occgeom = (OCCGeometry*)geom;
Mesh * me = (Mesh*)mesh;
mparam.uselocalh = mp->uselocalh;
// Only go into surface meshing if the face descriptors have already been added
if(!me->GetNFD())
return NG_ERROR;
numpoints = me->GetNP();
// Initially set up only for surface meshing without any optimisation
int perfstepsend = MESHCONST_MESHSURFACE;
// Check and if required, enable surface mesh optimisation step
if(mp->optsurfmeshenable)
{
perfstepsend = MESHCONST_OPTSURFACE;
}
OCCMeshSurface(*occgeom, *me, perfstepsend);
me->CalcSurfacesOfNode();
if(me->GetNP() <= numpoints)
return NG_ERROR;
if(me->GetNSE() <= 0)
return NG_ERROR;
return NG_OK;
}
// Extract the face map from the OCC geometry
// The face map basically gives an index to each face in the geometry,
// which can be used to access a specific face
DLL_HEADER Ng_Result Ng_OCC_GetFMap(Ng_OCC_Geometry * geom,
Ng_OCC_TopTools_IndexedMapOfShape * FMap)
Ng_OCC_TopTools_IndexedMapOfShape * FMap)
{
OCCGeometry* occgeom = (OCCGeometry*)geom;
TopTools_IndexedMapOfShape *occfmap = (TopTools_IndexedMapOfShape *)FMap;
// Copy the face map from the geometry to the given variable
occfmap->Assign(occgeom->fmap);
if(occfmap->Extent())
@ -694,13 +831,28 @@ namespace nglib
DLL_HEADER Ng_Meshing_Parameters :: Ng_Meshing_Parameters()
{
uselocalh = 1;
maxh = 1000;
minh = 0.0;
fineness = 0.5;
grading = 0.3;
elementsperedge = 2.0;
elementspercurve = 2.0;
closeedgeenable = 0;
closeedgefact = 2.0;
secondorder = 0;
meshsize_filename = 0;
quad_dominated = 0;
meshsize_filename = 0;
optsurfmeshenable = 1;
optvolmeshenable = 1;
optsteps_2d = 3;
optsteps_3d = 3;
}
@ -709,13 +861,28 @@ namespace nglib
DLL_HEADER void Ng_Meshing_Parameters :: Reset_Parameters()
{
uselocalh = 1;
maxh = 1000;
minh = 0;
fineness = 0.5;
grading = 0.3;
elementsperedge = 2.0;
elementspercurve = 2.0;
closeedgeenable = 0;
closeedgefact = 2.0;
secondorder = 0;
meshsize_filename = 0;
quad_dominated = 0;
meshsize_filename = 0;
optsurfmeshenable = 1;
optvolmeshenable = 1;
optsteps_2d = 3;
optsteps_3d = 3;
}
@ -723,6 +890,8 @@ namespace nglib
} // End of namespace nglib
// compatibility functions:
namespace netgen
@ -762,3 +931,4 @@ namespace netgen
}
} // End of namespace netgen

50
nglib/nglib.h
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@ -92,12 +92,28 @@ enum Ng_Result
class Ng_Meshing_Parameters
{
public:
double maxh; //!< Maximum global mesh size limit
int uselocalh; //!< Switch to enable / disable usage of local mesh size modifiers
double maxh; //!< Maximum global mesh size allowed
double minh; //!< Minimum global mesh size allowed
double fineness; //!< Mesh density: 0...1 (0 => coarse; 1 => fine)
double grading; //!< Mesh grading: 0...1 (0 => uniform mesh; 1 => aggressive local grading)
double elementsperedge; //!< Number of elements to generate per edge of the geometry
double elementspercurve; //!< Elements to generate per curvature radius
int closeedgeenable; //!< Enable / Disable mesh refinement at close edges
double closeedgefact; //!< Factor to use for refinement at close edges (STL: larger => finer ; OCC: larger => coarser)
int secondorder; //!< Generate second-order surface and volume elements
char * meshsize_filename; //!< Optional external mesh size file
int quad_dominated; //!< Creates a Quad-dominated mesh
char * meshsize_filename; //!< Optional external mesh size file
int optsurfmeshenable; //!< Enable / Disable automatic surface mesh optimization
int optvolmeshenable; //!< Enable / Disable automatic volume mesh optimization
int optsteps_3d; //!< Number of optimize steps to use for 3-D mesh optimization
int optsteps_2d; //!< Number of optimize steps to use for 2-D mesh optimization
@ -107,12 +123,19 @@ public:
Note: This constructor initialises the variables in the
class with the following default values
- #uselocalh: 1
- #maxh: 1000.0
- #fineness: 0.5
- #grading: 0.3
- #elementsperedge: 2.0
- #elementspercurve: 2.0
- #closeedgeenable: 0
- #closeedgefact: 2.0
- #secondorder: 0.0
- #meshsize_filename: null
- #quad_dominated: 0
- #optsurfmeshenable: 1
- #optvolmeshenable: 1
- #optsteps_2d: 3
- #optsteps_3d: 3
*/
@ -543,8 +566,8 @@ DLL_HEADER Ng_Result Ng_STL_MakeEdges (Ng_STL_Geometry * geom,
// generates mesh, empty mesh must be already created.
DLL_HEADER Ng_Result Ng_STL_GenerateSurfaceMesh (Ng_STL_Geometry * geom,
Ng_Mesh * mesh,
Ng_Meshing_Parameters * mp);
Ng_Mesh * mesh,
Ng_Meshing_Parameters * mp);
#ifdef ACIS
@ -587,10 +610,25 @@ DLL_HEADER Ng_OCC_Geometry * Ng_OCC_Load_IGES (const char * filename);
// Loads geometry from BREP file
DLL_HEADER Ng_OCC_Geometry * Ng_OCC_Load_BREP (const char * filename);
// Set the local mesh size based on geometry / topology
DLL_HEADER Ng_Result Ng_OCC_SetLocalMeshSize (Ng_OCC_Geometry * geom,
Ng_Mesh * mesh,
Ng_Meshing_Parameters * mp);
// Mesh the edges and add Face descriptors to prepare for surface meshing
DLL_HEADER Ng_Result Ng_OCC_GenerateEdgeMesh (Ng_OCC_Geometry * geom,
Ng_Mesh * mesh,
Ng_Meshing_Parameters * mp);
// Mesh the surfaces of an OCC geometry
DLL_HEADER Ng_Result Ng_OCC_GenerateSurfaceMesh (Ng_OCC_Geometry * geom,
Ng_Mesh * mesh,
Ng_Meshing_Parameters * mp);
// Get the face map of an already loaded OCC geometry
DLL_HEADER Ng_Result Ng_OCC_GetFMap(Ng_OCC_Geometry * geom,
Ng_OCC_TopTools_IndexedMapOfShape * FMap);
#endif
#endif // OCCGEOMETRY
#endif
#endif // NGLIB