netgen/nglib/nglib.h

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2009-01-18 19:47:12 +05:00
#ifndef NGLIB
#define NGLIB
/**************************************************************************/
/* File: nglib.hh */
/* Author: Joachim Schoeberl */
/* Date: 7. May. 2000 */
/**************************************************************************/
/*
Interface to the netgen meshing kernel
*/
/// Data type for NETGEN mesh
typedef void * Ng_Mesh;
/// Data type for NETGEN CSG geomty
typedef void * Ng_CSG_Geometry;
/// Data type for NETGEN 2D geomty
typedef void * Ng_Geometry_2D;
/// Data type for NETGEN STL geomty
typedef void * Ng_STL_Geometry;
// max number of nodes per element
#define NG_VOLUME_ELEMENT_MAXPOINTS 10
// implemented element types:
enum Ng_Volume_Element_Type { NG_TET = 1, NG_PYRAMID = 2, NG_PRISM = 3,
NG_TET10 = 4 };
// max number of nodes per surface element
#define NG_SURFACE_ELEMENT_MAXPOINTS 6
// implemented element types:
enum Ng_Surface_Element_Type { NG_TRIG = 1, NG_QUAD = 2,
NG_TRIG6 = 3 };
class Ng_Meshing_Parameters
{
public:
double maxh;
double fineness; // 0 .. coarse, 1 .. fine
int secondorder;
char * meshsize_filename;
int quad_dominated;
Ng_Meshing_Parameters();
};
enum Ng_Result { NG_OK = 0,
NG_SURFACE_INPUT_ERROR = 1,
NG_VOLUME_FAILURE = 2,
NG_STL_INPUT_ERROR = 3,
NG_SURFACE_FAILURE = 4,
NG_FILE_NOT_FOUND = 5 };
// initialize, deconstruct Netgen library:
void Ng_Init ();
void Ng_Exit ();
// Generates new mesh structure
Ng_Mesh * Ng_NewMesh ();
void Ng_DeleteMesh (Ng_Mesh * mesh);
// feeds points, surface elements and volume elements to the mesh
void Ng_AddPoint (Ng_Mesh * mesh, double * x);
void Ng_AddSurfaceElement (Ng_Mesh * mesh, Ng_Surface_Element_Type et,
int * pi);
void Ng_AddVolumeElement (Ng_Mesh * mesh, Ng_Volume_Element_Type et,
int * pi);
// ask for number of points, surface and volume elements
int Ng_GetNP (Ng_Mesh * mesh);
int Ng_GetNSE (Ng_Mesh * mesh);
int Ng_GetNE (Ng_Mesh * mesh);
// return point coordinates
void Ng_GetPoint (Ng_Mesh * mesh, int num, double * x);
// return surface and volume element in pi
Ng_Surface_Element_Type
Ng_GetSurfaceElement (Ng_Mesh * mesh, int num, int * pi);
Ng_Volume_Element_Type
Ng_GetVolumeElement (Ng_Mesh * mesh, int num, int * pi);
// Defines MeshSize Functions
void Ng_RestrictMeshSizeGlobal (Ng_Mesh * mesh, double h);
void Ng_RestrictMeshSizePoint (Ng_Mesh * mesh, double * p, double h);
void Ng_RestrictMeshSizeBox (Ng_Mesh * mesh, double * pmin, double * pmax, double h);
// generates volume mesh from surface mesh
Ng_Result Ng_GenerateVolumeMesh (Ng_Mesh * mesh, Ng_Meshing_Parameters * mp);
void Ng_SaveMesh(Ng_Mesh * mesh, const char* filename);
Ng_Mesh * Ng_LoadMesh(const char* filename);
// **********************************************************
// ** 2D Meshing **
// **********************************************************
// feeds points and boundary to mesh
void Ng_AddPoint_2D (Ng_Mesh * mesh, double * x);
void Ng_AddBoundarySeg_2D (Ng_Mesh * mesh, int pi1, int pi2);
// ask for number of points, elements and boundary segments
int Ng_GetNP_2D (Ng_Mesh * mesh);
int Ng_GetNE_2D (Ng_Mesh * mesh);
int Ng_GetNSeg_2D (Ng_Mesh * mesh);
// return point coordinates
void Ng_GetPoint_2D (Ng_Mesh * mesh, int num, double * x);
// return 2d triangles
void Ng_GetElement_2D (Ng_Mesh * mesh, int num, int * pi, int * matnum = NULL);
// return 2d boundary segment
void Ng_GetSegment_2D (Ng_Mesh * mesh, int num, int * pi, int * matnum = NULL);
// load 2d netgen spline geometry
Ng_Geometry_2D * Ng_LoadGeometry_2D (const char * filename);
// generate 2d mesh, mesh is allocated by function
Ng_Result Ng_GenerateMesh_2D (Ng_Geometry_2D * geom,
Ng_Mesh ** mesh,
Ng_Meshing_Parameters * mp);
void Ng_HP_Refinement (Ng_Geometry_2D * geom,
Ng_Mesh * mesh,
int levels);
// **********************************************************
// ** STL Meshing **
// **********************************************************
// loads geometry from STL file
Ng_STL_Geometry * Ng_STL_LoadGeometry (const char * filename, int binary = 0);
// generate new STL Geometry
Ng_STL_Geometry * Ng_STL_NewGeometry ();
// fills STL Geometry
// positive orientation
// normal vector may be null-pointer
void Ng_STL_AddTriangle (Ng_STL_Geometry * geom,
double * p1, double * p2, double * p3,
double * nv = NULL);
// add (optional) edges :
void Ng_STL_AddEdge (Ng_STL_Geometry * geom,
double * p1, double * p2);
// after adding triangles (and edges) initialize
Ng_Result Ng_STL_InitSTLGeometry (Ng_STL_Geometry * geom);
// automatically generates edges:
Ng_Result Ng_STL_MakeEdges (Ng_STL_Geometry * geom,
Ng_Mesh* mesh,
Ng_Meshing_Parameters * mp);
// generates mesh, empty mesh must be already created.
Ng_Result Ng_STL_GenerateSurfaceMesh (Ng_STL_Geometry * geom,
Ng_Mesh * mesh,
Ng_Meshing_Parameters * mp);
#ifdef ACIS
// **********************************************************
// ** ACIS Meshing **
// **********************************************************
/// Data type for NETGEN STL geomty
typedef void * Ng_ACIS_Geometry;
// loads geometry from STL file
Ng_ACIS_Geometry * Ng_ACIS_LoadGeometry (const char * filename);
// generates mesh, empty mesh must be already created.
Ng_Result Ng_ACIS_GenerateSurfaceMesh (Ng_ACIS_Geometry * geom,
Ng_Mesh * mesh,
Ng_Meshing_Parameters * mp);
#endif
#endif