/*!
\page meshes Meshes
Overview
Several types of meshes are available in MEDCoupling:
- \subpage MEDCouplingPointSetPage "Point set mesh" (abstract, can not be instanciated)
- \subpage MEDCouplingUMeshPage "Unstructured meshes"
- \subpage MEDCouplingCMeshPage "Cartesian meshes"
- \subpage MEDCouplingExtrudedPage "3D Extruded meshes"
\anchor MEDCouplingMeshes
Common concept shared by all type of Meshes in MEDCoupling
A mesh has the following properties :
- a name (a string)
- **a dimension (called mesh dimension) and only one** (it implies that \b all cells constituting
mesh have the same dimension, e.g. no mix between a volumic cube and a flat triangle in the same mesh). This
point matters as it differs from what the MED file format authorizes.
- a space dimension (the space where the coordinates of the points are defined)
- a set of nodes
- a set of cells (whose vertices are in the node set above)
In MEDCoupling library there is no explicit notion of faces nor edges. All cells, be it in 3D, 2D or 1D is
described by a set of point, or by a set of coordinates.
As said above, a mesh has only one dimension, which is often called the "mesh dimension". This notion is different
from the "space dimension", corresponding to the dimension of the space where the nodes are defined.
For example a mesh with a mesh dimension equal to 1 can have \b cells of type
NORM_SEG2 (simple segments). This mesh can however have a space dimension of 3, meaning that we
describe a 3D polygonal line.
Another example: a mesh with a mesh dimension equal
to 2, can have \b cells of type NORM_TRI3 (triangles) and NORM_POLYGON (arbitrary 2D polygons) for example.
It can still have a space dimension of 3, meaning that we describe a planar surface embedded in a 3D space.
The (abstract) class that covers the concept described above is \ref ParaMEDMEM::MEDCouplingMesh.
Available (non abstract) mesh types in MEDCoupling
- \ref MEDCouplingUMeshPage
- \ref MEDCouplingCMeshPage
- \ref MEDCouplingExtrudedPage
*/