GetFEM  5.4.2
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32 /**@file getfem_import.h
33  @author Julien Pommier <>
34  @date Januar 17, 2003.
35  @brief Import mesh files from various formats.
36 */
38 #ifndef GETFEM_IMPORT_H__
39 #define GETFEM_IMPORT_H__
41 #include <string>
42 #include <iostream>
43 #include <map>
44 #include <set>
45 #include "bgeot_config.h" /* for bgeot::size_type */
47 namespace getfem {
48  using bgeot::size_type;
49  class mesh;
51  /** imports a mesh file.
52  format can be:
54  - "gid" for meshes generated by GiD
55  -- mesh nodes are always 3D
58  - "gmsh" for meshes generated by Gmsh
59  IMPORTANT NOTE: if you do not assign a physical surface/volume
60  to your 3D mesh, the file will also contain the mesh of the
61  boundary (2D elements) and the boundary of the boundary (line
62  elements!).
64  GetFEM makes use of the physical "region" number stored with
65  each element in the gmsh file to fill the corresponding region
66  of the mesh object.
68  For a mesh of dimension N, getfem builds a mesh with the
69  convexes listed in the gmsh file whose dimension are N, the
70  convexes of dim N-1 are used to tag "region" of faces,
71  according to their gmsh "physical region number" (physical
72  region number 'n' is mapped to the getfem region), and
73  the convexes of lower dimension are ignored.
75  All regions must have different number! This means that the
76  parametrization of the mesh in Gmsh .geo file must assign a
77  different number to each region, the problem exists because in
78  Gmsh can coexist, for example, "Physical Surface (200)" and
79  "Physical Line (200)", as they are different "types of regions"
80  in Gmsh, that which does not occur in GetFEM since there is
81  only one "type of region".
84  - "cdb" for meshes generated by ANSYS (in blocked format).
86  Currently, plane and solid elements of types 42,45,73,82,87,89,
87  90,92,95,162,182,183,185,186,187 and 191 are supported.
88  This however does not include any finite element techology linked
89  to these elements but only their geometry.
91  By default GetFEM will define mesh regions corresponding to
92  material ids found in the imported cdb file, if there are more
93  than one material ids available.
95  Using "cdb:N" as format specifier, only elements with material
96  id equal to an integer N will be imported.
98  The recommended ANSYS command for generating a mesh file is:
100  cdwrite,db,filename,cdb
103  - "am_fmt" for 2D meshes from emc2
104  []
106  */
107  void import_mesh(const std::string& filename, const std::string& format,
108  mesh& m);
109  void import_mesh(std::istream& f, const std::string& format,
110  mesh& m);
111  void import_mesh(const std::string& filename, mesh& m);
113  /** Import a mesh file in format generated by Gmsh.
115  The function works exactly like impot_mesh() functions
116  except that they return additional mapping of physical
117  region names to their numbers.
119  The example below shows how to print region names
120  and their numbers:
121  @code
122  getfem::mesh myMesh;
123  typedef std::map<std::string, size_type> RegMap;
124  typedef RegMap::iterator RegMapIter;
125  RegMap regmap;
126  getfem::import_mesh_gmsh("mesh.msh", myMesh, regmap);
127  std::cout << regmap.size() << "\n";
128  for (RegMapIter i=regmap.begin(); i != regmap.end(); i++) {
129  std::cout << i->first << " " << i->second << "\n";
130  }
131  @endcode
133  Additionally, the optional lower_dim_convex_rg defines a set
134  of face regions that need to be imported explicitly as convexes.
136  add_all_element_type flag, if set to true, will import all the lower
137  dimension elements defined as independent convexes, only if the elements
138  are not face of another convex. Thus, a 3D model can have a mixture of
139  3D solid, 2D plates and 1D rod elements. This feature is still yet to
140  be tested.
141  */
142  void import_mesh_gmsh(const std::string& filename, mesh& m,
143  std::map<std::string, size_type> &region_map,
144  bool remove_last_dimension = true,
145  std::map<size_type, std::set<size_type>> *nodal_map = NULL,
146  bool remove_duplicated_nodes = true);
148  void import_mesh_gmsh(std::istream& f, mesh& m,
149  std::map<std::string, size_type> &region_map,
150  bool remove_last_dimension = true,
151  std::map<size_type, std::set<size_type>> *nodal_map = NULL,
152  bool remove_duplicated_nodes = true);
154  void import_mesh_gmsh(const std::string& filename, mesh& m,
155  bool add_all_element_type = false,
156  std::set<size_type> *lower_dim_convex_rg = NULL,
157  std::map<std::string, size_type> *region_map = NULL,
158  bool remove_last_dimension = true,
159  std::map<size_type, std::set<size_type>> *nodal_map = NULL,
160  bool remove_duplicated_nodes = true);
162  void import_mesh_gmsh(std::istream& f, mesh& m,
163  bool add_all_element_type = false,
164  std::set<size_type> *lower_dim_convex_rg = NULL,
165  std::map<std::string, size_type> *region_map = NULL,
166  bool remove_last_dimension = true,
167  std::map<size_type, std::set<size_type>> *nodal_map = NULL,
168  bool remove_duplicated_nodes = true);
170  /** for gmsh and gid meshes, the mesh nodes are always 3D, so for a 2D mesh
171  the z-component of nodes should be removed */
172  void maybe_remove_last_dimension(mesh &msh);
174  /** for gmsh meshes, create table linking region name to region_id. */
175  std::map<std::string, size_type> read_region_names_from_gmsh_mesh_file(std::istream& f);
176 }
177 #endif /* GETFEM_IMPORT_H__ */
size_t size_type
used as the common size type in the library
Definition: bgeot_poly.h:49
GEneric Tool for Finite Element Methods.
Definition: getfem_accumulated_distro.h:46
void import_mesh_gmsh(const std::string &filename, mesh &m, std::map< std::string, size_type > &region_map, bool remove_last_dimension=true, std::map< size_type, std::set< size_type >> *nodal_map=NULL, bool remove_duplicated_nodes=true)
Import a mesh file in format generated by Gmsh.
std::map< std::string, size_type > read_region_names_from_gmsh_mesh_file(std::istream &f)
for gmsh meshes, create table linking region name to region_id.
void import_mesh(const std::string &filename, const std::string &format, mesh &m)
imports a mesh file.
defines and typedefs for namespace bgeot
void maybe_remove_last_dimension(mesh &msh)
for gmsh and gid meshes, the mesh nodes are always 3D, so for a 2D mesh the z-component of nodes shou...