X-Git-Url: http://git.salome-platform.org/gitweb/?a=blobdiff_plain;f=doc%2Fsalome%2Fgui%2FSMESH%2Finput%2Fabout_meshes.doc;h=be900bc1decb309399b3aa196b3631197ef327fc;hb=d92118a7a570fd784e024a7a893a67a4fc8f112c;hp=ebab52e8bb13e844d583e11665f2e18eeb9c362c;hpb=bb40f7c1d3542da1ff59b6c3bface0574789dded;p=modules%2Fsmesh.git

diff --git a/doc/salome/gui/SMESH/input/about_meshes.doc b/doc/salome/gui/SMESH/input/about_meshes.doc
index ebab52e8b..be900bc1d 100644
--- a/doc/salome/gui/SMESH/input/about_meshes.doc
+++ b/doc/salome/gui/SMESH/input/about_meshes.doc
@@ -5,12 +5,16 @@
 \n \b MESH represents a discrete approximation of a subset of the
 three-dimensional space by \ref mesh_entities "elementary geometrical elements".
 
+A SALOME study can contain multiple meshes, but they do not
+implicitly compose one super-mesh, and finally each of them
+can be used (e.g. exported) only individually.
+
 Mesh module provides several ways to create the mesh:
 <ul>
   <li>The main way is to \subpage constructing_meshes_page "construct the mesh" 
     on the basis of the geometrical shape produced in the Geometry
     module. This way implies selection of 
-    - a geometrical object (<em> main shape</em>) and
+    - a geometrical object (<em>main shape</em>) and
     - <em>meshing parameters</em> (\ref
       basic_meshing_algos_page "meshing algorithms" and
     characteristics (e.g. element size) of a
@@ -18,32 +22,32 @@ Mesh module provides several ways to create the mesh:
     objects).
 
     Construction of \subpage constructing_submeshes_page "sub-meshes"
-    allows to mesh some sub-shapes of the main shape, for example a face,
-    using different meshing parameters than other sub-shapes.<br>
+    allows to discretize some sub-shapes of the main shape, for example a face,
+    using the meshing parameters that differ from those used for other sub-shapes.<br>
     Meshing parameters of meshes and sub-meshes can be 
     \subpage editing_meshes_page "edited". (Upon edition only mesh entities
     generated using changed meshing parameters are removed and will be
     re-computed).<br>
-    \note Algorithms and hypotheses used at mesh level are referred as
-    \a global ones and those used at sub-mesh level are referred as \a
+    \note Algorithms and hypotheses used at mesh level are referred to as
+    \a global ones and those used at sub-mesh level are referred to as \a
     local ones.
   </li>
   <li>Bottom-up way, using \ref modifying_meshes_page "mesh modification"
     operations, especially \ref extrusion_page "extrusion" and \ref
     revolution_page "revolution". To create an empty mesh not based on
     geometry, use the same dialog as to \ref constructing_meshes_page
-    "construct the mesh on geometry" but do not specify any geometry
-    nor meshing algorithm.
+    "construct the mesh on geometry" but specify neither the geometry
+    nor meshing algorithms.
   </li>
-  <li>The mesh can be \ref importing_exporting_meshes_page "imported" from
+  <li>The mesh can be \subpage importing_exporting_meshes_page "imported" from
     (and exported to) the file in MED, UNV, STL, CGNS, DAT, GMF and
     SAUVE formats.
   </li>
-  <li>The 3D mesh can be generated from the 2D mesh, \ref
-    importing_exporting_meshes_page "imported" or manually created. To
-    setup the meshing parameters of a mesh not based on geometry, just
-    invoke \ref editing_meshes_page "Edit mesh / sub-mesh" command on
-    your 3D mesh.
+  <li>The 3D mesh can be generated from the 2D mesh not based on geometry,
+    which was either \ref importing_exporting_meshes_page "imported" or created in
+    other way. To setup the meshing parameters of a mesh not based on geometry,
+    just invoke \ref editing_meshes_page "Edit mesh / sub-mesh" command on
+    your 2D mesh.
   </li>
   <li>Several meshes can be \subpage building_compounds_page "combined"
     into a new mesh.
@@ -51,51 +55,64 @@ Mesh module provides several ways to create the mesh:
   <li>The whole mesh or its part (sub-mesh or group) can be 
     \subpage copy_mesh_page "copied" into a new mesh.
   </li>
+  <li>A new mesh can be created from a transformed, e.g. \ref
+    translation_page "translated", part of the mesh.</li>
 </ul>
 
 Meshes can be edited using the MESH functions destined for 
 \ref modifying_meshes_page "modification" of meshes.
 
+Attractive meshing capabilities include:
+- 3D and 2D \ref viscous_layers_anchor "Viscous Layers" (boundary
+  layers of highly stretched elements beneficial for high quality
+  viscous computations);
+- automatic conformal transition between tetrahedral and hexahedral
+  sub-meshes.
 
 The \b structure of a SALOME mesh is described by nodes and elements based on
-these nodes. Geometry of the element is defined by the sequence of
-nodes constituting it and
-the <a href="http://www.code-aster.org/outils/med/html/connectivites.html">
-  connectivity convention </a> (adopted from MED library). Definition of
-the element basing on elements of lower dimension is NOT supported.
+these nodes. The geometry of an element is defined by the sequence of
+nodes constituting it and the \ref connectivity_page "connectivity convention"
+(adopted from MED library). Definition of the element basing on the elements
+of a lower dimension is NOT supported.
 
 \anchor mesh_entities
-The mesh can include the following entities (also referred as \a elements):
+The mesh can include the following entities:
 <ul>
-<li>\b Node &mdash; an entity of a mesh defining a position in 3D
+<li>\b Node &mdash; a mesh entity defining a position in 3D
   space with coordinates (x, y, z).</li>
-<li>\b Edge (or segment) &mdash; 1D element of a mesh linking two nodes.</li>
-<li>\b Face &mdash; 2D element of a mesh representing a part of
+<li>\b Edge (or segment) &mdash; 1D mesh element linking two nodes.</li>
+<li>\b Face &mdash; 2D mesh element representing a part of
   surface bound by links between face nodes. A face can be a
   triangle, quadrangle or polygon.</li>
-<li>\b Volume &mdash; 3D element of a mesh representing a part of 3D
+<li>\b Volume &mdash; 3D mesh element representing a part of 3D
   space bound by volume facets. Nodes of a volume describing each
   facet are defined by
-  the <a href="http://www.code-aster.org/outils/med/html/connectivites.html">
-  MED connectivity convention.</a> A volume can be a tetrahedron, hexahedron,
+  the \subpage connectivity_page "connectivity convention".
+  A volume can be a tetrahedron, hexahedron,
   pentahedron, pyramid, hexagonal prism or polyhedron.</li>
-<li>\b 0D element &mdash; element of a mesh defined by one node.</li>
-<li>\b Ball element &mdash; discrete element of a mesh defined by a
+<li>\b 0D element &mdash; mesh element defined by one node.</li>
+<li>\b Ball element &mdash; discrete mesh element defined by a
   node and a diameter.</li>
 </ul>
 
 Every mesh entity has an attribute associating it to a sub-shape it is
 generated on (if any). The node generated on the geometrical edge or
 surface in addition stores its position in parametric space of the
-associated geometrical entity.
+associated geometrical entity. This attribute is set up by meshing
+algorithms generating elements and nodes.
+
+Mesh entities are identified by integer IDs starting from 1.
+Nodes and elements are counted separately, i.e. there can be a node
+and element with the same ID.
 
-SALOME supports elements of second order, without central node
-(quadratic triangle, quadrangle, tetrahedron, hexahedron, pentahedron
-and pyramid) and with central nodes (bi-quadratic triangle and
-quadrangle and tri-quadratic hexahedron).<br>
-Quadratic mesh can be obtained in two ways:
+SALOME supports elements of second order, without a central node
+(quadratic triangle, quadrangle, polygon, tetrahedron, hexahedron,
+pentahedron and pyramid) and with central nodes (bi-quadratic triangle
+and quadrangle and tri-quadratic hexahedron).<br>
+Quadratic mesh can be obtained in three ways:
 - Using a global \ref quadratic_mesh_anchor "Quadratic Mesh"
 hypothesis. (Elements with the central node are not generated in this way).
 - Using \ref convert_to_from_quadratic_mesh_page operation.
-
+- Using an appropriate option of some meshing algorithms, which
+generate elements of several dimensions starting from mesh segments.
 */