taken into account by the chosen meshing algorithms.
Then you can launch mesh generation by invoking \ref compute_anchor "Compute" command.
+The generated mesh will be automatically shown in the Viewer. You can
+switch off automatic visualization or limit mesh size until which it is
+automatically shown in \ref mesh_preferences_page (<em>Automatic update</em> entry).
\note Sometimes \a hypotheses term is used to refer to both algorithms
and hypotheses.
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 node of segments are then
+segments using nodes on vertices; the nodes 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.
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
shape. The main Mesh object:
<ul>
<li><i>1D</i> <b>Wire discretisation</b> with <b>Number of Segments</b>=20</li>
- <li><i>2D</i> <b>Triangle (Mefisto)</b> with Hypothesis<b>Max Element Area</b>
+ <li><i>2D</i> <b>Triangle: Mefisto</b> with Hypothesis<b>Max Element Area</b>
</li>
</ul>
The first sub-mesh <b>Submesh_1</b> created on <b>Face_1</b> is:
<ul>
<li><i>1D</i> <b>Wire discretisation</b> with <b>Number of Segments</b>=4</li>
- <li><i>2D</i> <b>Triangle (Mefisto)</b> with Hypothesis <b>MaxElementArea</b>=1200</li>
+ <li><i>2D</i> <b>Triangle: Mefisto</b> with Hypothesis <b>MaxElementArea</b>=1200</li>
</ul>
The second sub-mesh <b>Submesh_2</b> created on <b>Face_2</b> is:
<ul>
<li><i>1D</i> <b>Wire discretisation</b> with <b>Number of Segments</b>=8</li>
- <li><i>2D</i> <b>Triangle (Mefisto)</b> with Hypothesis <b>MaxElementArea</b>=1200</li>
+ <li><i>2D</i> <b>Triangle: Mefisto</b> with Hypothesis <b>MaxElementArea</b>=1200</li>
</ul>
And the last sub-mesh <b>Submesh_3</b> created on <b>Face_3</b> is:
<ul>
<li><i>1D</i> <b>Wire discretisation</b> with <b>Number of Segments</b>=12</li>
- <li><i>2D</i> <b>Triangle (Mefisto)</b> with Hypothesis <b>MaxElementArea</b>=1200</li>
+ <li><i>2D</i> <b>Triangle: Mefisto</b> with Hypothesis <b>MaxElementArea</b>=1200</li>
</ul>
The sub-meshes become concurrent if they share sub-shapes that can be
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
with the same contents. (To fully re-compute the mesh, invoke
\ref clear_mesh_anchor "Clear Mesh Data" command before).
+\anchor meshing_result_anchor
If the mesh computation has been a success, the box shows information
on the number of entities of different types in the mesh.
\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
</center>
\note Mesh Computation Information box does not appear if you set
-"Mesh computation/Show a computation result notification" preference
+\ref show_comp_result_pref "Mesh computation/Show a computation result notification" preference
to the "Never" value. This option gives the possibility to control mesh
computation reporting. There are the following possibilities: always
show the information box, show only if an error occurs or never.
