Mesh generation on the geometry is performed in the bottom-up
flow: nodes on vertices are created first, then edges are divided into
-segments using nodes on vertices; the segments of edges are then
-used to mesh faces; then the mesh of faces is used to mesh
+segments using nodes on vertices; the node of segments are then
+used to mesh faces; then the nodes of faces are used to mesh
solids. This automatically assures the conformity of the mesh.
It is required to choose a meshing algorithm for every dimension of
only the sub-shapes, for which an algorithm and a hypothesis (if any)
have been defined will be discretized.
-\n Construction of a mesh on a geometry includes at least two (mesh
-creation and computing) of the following steps:
+\n Construction of a mesh on a geometry includes at least two
+(\ref create_mesh_anchor "mesh creation" and
+\ref compute_anchor "computing") of the following steps:
<ul>
<li> \ref create_mesh_anchor "Creation of a mesh object", where you
can specify meshing parameters to apply to all sub-shapes of the
which is a 2D object, you do not need to define a 3D Algorithm and
Hypotheses.
- In the <b>Object Browser</b> the structure of the new mesh will be
+ In the <b>Object Browser</b> the structure of the new mesh is
displayed as follows:
-
- <center>
\image html image88.jpg
- </center>
-
It contains:
<ul>
<li>a mesh name (<em>Mesh_mechanic</em>);
to the hypotheses chosen at the construction of the mesh;</li>
<li><b>Applied algorithms</b> folder containing the references
to the algorithms chosen at the construction of the mesh.</li>
+ <li><b>SubMeshes on Face</b> folder containing the sub-meshes
+ defined on geometrical faces. There also can be folders for
+ sub-meshes on vertices, edges, wires, shells, solids and
+ compounds.</li>
+ <li><b>Groups of Faces</b> folder containing the groups of mesh
+ faces. There also can be folders for groups of nodes, edges,
+ volumes 0D elements and balls.</li>
</ul>
There is an alternative way to assign Algorithms and Hypotheses by
CustomMeshers.xml file located in the home directory. CustomMeshers.xml
file must describe sets of hypotheses in the
same way as ${SMESH_ROOT_DIR}/share/salome/resources/smesh/StdMeshers.xml
- file does (sets of hypotheses are enclosed between <hypotheses-set-group>
- tags).
-
- <center>
+ file does (sets of hypotheses are enclosed between \<hypotheses-set-group\>
+ tags). For example:
+~~~~~~{.xml}
+ <?xml version='1.0' encoding='us-ascii'?>
+ <!DOCTYPE meshers PUBLIC "" "desktop.dtd">
+ <meshers>
+ <hypotheses-set-group>
+ <hypotheses-set name="My favorite hypotheses"
+ hypos="AutomaticLength"
+ algos="CompositeSegment_1D, Quadrangle_2D, GHS3D_3D"/>
+ </hypotheses-set-group>
+ </meshers>
+~~~~~~
+ If the file contents are incorrect, there can be an error at
+ activation of Mesh module: <em>"fatal parsing error: error
+ triggered by consumer in line ..."</em>
+<br>
+<center>
\image html hypo_sets.png
List of sets of hypotheses. Tag <em>[custom]</em> is
automatically added to the sets defined by the user.
- </center>
-
+</center>
\note
- \a "Automatic" in the names of predefined sets of hypotheses
does not actually mean that they are suitable for meshing any
<h2>Previewing the mesh</h2>
Before \ref compute_anchor "the mesh computation", it is also possible
-to see the mesh preview.
+to see the mesh preview. This operation allows to incrementally
+compute the mesh, dimension by dimension, and to discard an
+unsatisfactory mesh.
For this, select the mesh in the Object Browser. From the \b Mesh menu
select \b Preview or click "Preview" button in the toolbar or activate
It is equally possible to skip \ref evaluate_anchor "the Evaluation"
and \ref preview_anchor "the Preview" and to \b Compute the mesh after
the hypotheses are assigned. For this, select your mesh in
-the <b>Object Browser</b>. From the \b Mesh menu select \b Compute or
-click "Compute" button of the toolbar.
+the <b>Object Browser</b>. From the \b Mesh menu or the context menu
+select \b Compute or click \a "Compute" button of the toolbar.
<center>
\image html image28.png
\image html meshcomputationfail.png
-After you select an error, <b>Show Sub-shape</b> button allows
-visualizing in magenta the geometrical entity that causes the error.
+After you select an error in \b Errors table, <b>Show Sub-shape</b> button allows
+visualizing in magenta the geometrical entity meshing of which failed
+(Name of this entity or its ID and type is shown in \a Sub-shape column).
<center>
\image html failed_computation.png
