geometrical model in the 3D Viewer, which can help to understand the
location of a set of edges within the model.
-<b>Propagation chains</b> group allows splitting opposite edges of quadrilateral faces
+<b>Propagation chains</b> group allows defining <b>Reversed Edges</b>
+for splitting opposite edges of quadrilateral faces
in a logically uniform direction. When this group is
activated, the list is filled with propagation chains found within the
model. When a chain is selected in the list its edges are
Hypotheses are created during creation and edition of
\ref constructing_meshes_page "meshes" and
\ref constructing_submeshes_page "sub-meshes".
-Once created a hypotheses can be reused during creation and
-edition of other meshes and sub-meshes. All created hypotheses and
-algorithms are present in the Object Browser in \a Hypotheses and
-\a Algorithms folders correspondingly. It is possible to open a dialog
-to modify the parameters of a hypothesis from its context menu.
-This menu also provides \b Unassign command that will unassign the hypothesis from all
-meshes and sub-meshes using it.
-Modification of any parameter of a hypothesis and its unassignment lead
-to automatic removal of elements generated using it.
+Once created a hypotheses can be reused during creation and edition of
+other meshes and sub-meshes. All created hypotheses and algorithms are
+present in the Object Browser in \a Hypotheses and \a Algorithms
+folders correspondingly. It is possible to open a dialog to modify the
+parameters of a hypothesis from its context menu. This menu also
+provides \b Unassign command that will unassign the hypothesis from
+all meshes and sub-meshes using it. Modification of any parameter of a
+hypothesis and its unassignment leads to automatic removal of elements
+generated using it.
In \b MESH there are the following Basic Hypotheses:
<ul>
Thus you define a sub-mesh on the edge where you define 1D meshing
parameters and the \b Propagation hypothesis. These local meshing
parameters will be propagated via opposite sides of quadrangles to the
-whole geometry, or to an edge with other local meshing parameters.
+whole geometry, and this propagation stops at an edge with other local
+meshing parameters.
This hypothesis can be taken into account by
\ref a1d_algos_anchor "Wire Discretization" and
This additional hypothesis can be used together with 2D triangulation algorithms.
It allows 2D triangulation algorithms to build quadrangular meshes.
-This hypothesis cannot be used with "Quadrangle (Mapping)" meshing algorithm,
- since \ref hypo_quad_params_anchor "Quadrangle parameters"
-hypothesis has a restriction: the total quantity of
-segments on all four sides of the face must be even (divisible by 2).
+Usage of this hypothesis with "Quadrangle (Mapping)" meshing algorithm
+is obsolete since introducing
+\ref hypo_quad_params_anchor "Quadrangle parameters" hypothesis.
+Usage of this hypothesis with "Quadrangle (Mapping)" meshing algorithm
+corresponds to specifying "Quadrangle Preference" transition type of
+\ref hypo_quad_params_anchor "Quadrangle parameters" hypothesis.
+\note "Quadrangle Preference" transition type can be used only if the
+total quantity of segments on all sides of the face is even (divisible
+by 2), else "Standard" transition type is used.
*/
</li>
<li><em>Composite Side Discretization</em> algorithm - allows to apply a 1D
hypothesis to a whole side of a geometrical face even if it is
- composed of several edges provided that they form C1 curve in all faces of the main shape.</li>
+ composed of several edges provided that they form C1 curve in all
+ faces of the main shape.</li>
</ul>
<li>For meshing of 2D entities (<b>faces</b>):</li>
<li><b>Processing identical groups</b> - allows selecting the method
of processing the namesake groups existing in the input meshes.
They can be either <ul>
- <li>\b United - all elements of \em Group1 \em of Mesh_1 and \em Group1 of \em Mesh_2
- become the elements of \em Group1 of the \em Compound_Mesh, or</li>
- <li>\b Renamed - \em Group1 of \em Mesh_1 becomes \em Group1_1 and \em Group1 of \em Mesh_2
- becomes \em Group1_2.</li>
+ <li>\b United - all elements of \em Group1 of \em Mesh_1 and \em
+ Group1 of \em Mesh_2 become the elements of \em Group1 of the
+ \em Compound_Mesh, or</li>
+ <li>\b Renamed - \em Group1 of \em Mesh_1 becomes \em Group1_1
+ and \em Group1 of \em Mesh_2 becomes \em Group1_2.</li>
</ul>
See \ref grouping_elements_page "Creating Groups" for more information
about groups.</li>
3D sub-shapes (solids) and generate 3D mesh elements
(tetrahedra, hexahedra etc.)
- As soon as you have selected an algorithm, you can create a hypothesis (or
- select an already created one). A set of accessible
- hypotheses includes only the hypotheses that can be used by the selected algorithm.
+ As soon as you have selected an algorithm, you can create a
+ hypothesis (or select an already created one). A set of accessible
+ hypotheses includes only the hypotheses that can be used by the
+ selected algorithm.
\note
- Some page(s) can be disabled if the geometrical
dialog pages related to the corresponding lower dimensions are
disabled.
- \b 0D page refers to 0D geometry (vertices) rather than
- to 0D elements. Mesh module does not provide algorithms that
+ to 0D elements. Mesh module does not provide algorithms that
produce 0D elements. Currently \b 0D page provides only one
algorithm "Segments around vertex" that allows specifying the required
size of mesh edges about the selected vertex (or vertices).
For example, you need to mesh a 3D object.
First, you can change a default name of your mesh in the \b Name
- box. Then check that the selected geometrical object
- indicated in \b Geometry field, is what you wish to mesh; if not, select
+ box. Then check that the selected geometrical object indicated in
+ \b Geometry field, is what you wish to mesh; if not, select
the correct object in the Object Browser. Click "Select" button
near \b Geometry field if the name of the object has not yet
appeared in \b Geometry field.
</center>
\note
- - \a "Automatic" in the names of predefined sets of
- hypotheses does not actually mean that they are suitable for
- meshing any geometry.
+ - \a "Automatic" in the names of predefined sets of hypotheses
+ does not actually mean that they are suitable for meshing any
+ geometry.
- The list of sets of hypotheses can be shorter than in the
above image depending on the geometry dimension.
</li>
After the mesh computation finishes, the Mesh Computation information
box appears. If you close this box and click "Compute" button again,
-without previously changing meshing parameters, the mesh will
-NOT be re-computed and the Mesh Computation information box will be shown with
-the same contents. (To fully re-compute the mesh, invoke \ref
-clear_mesh_anchor "Clear Mesh Data" command before).
+without previously changing meshing parameters, the mesh will NOT be
+re-computed and the Mesh Computation information box will be shown
+with the same contents. (To fully re-compute the mesh, invoke
+\ref clear_mesh_anchor "Clear Mesh Data" command before).
-If the mesh computation has been a success, the box shows information on the number of entities
-of different types in the mesh.
+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 meshcomputationsucceed.png
<li>If the <b>Extrusion to Distance</b> radio button is selected
- specify the translation vector by which the elements will be extruded.
</li>
-
+ <p><br></p>
+
\image html extrusionalongaline2.png
<li>If the <b>Extrusion Along Vector</b> radio button is selected
be negative).</li>
</ul>
</li>
-
+ <p><br></p>
+
\image html extrusionalongaline3.png
<li>If the <b>Extrusion By Normal</b> radio button is selected,
- \ref importing_exporting_meshes_page "Exported" into a file as a
whole mesh.
-In the Object Browser, if an item contains more
-than one group, it is possible to sort its groups by name in
-ascending order using <b>Sort children</b> context menu item.
+In the Object Browser, if an item contains more than one child group,
+it is possible to sort the groups by name in ascending order
+using <b>Sort children</b> context menu item.
\image html smesh_sort_groups.png "Sorting groups"
\n In MESH there is a functionality allowing import/export
of meshes from/to \b MED, \b UNV (I-DEAS 10), \b DAT (simple ascii format), \b STL,
-\b GMF (internal format of DISTENE products, namely BLSurf, GHS3D and
-Hexotic algorithms) and \b CGNS format files. You can also export a
+\b GMF (internal format of DISTENE products, namely MG-CADSurf, MG-Tetra and
+MG-Hexa algorithms) and \b CGNS format files. You can also export a
group as a whole mesh.
either \ref importing_exporting_meshes_page "imported" or manually
created);
</li>
-<li>\ref importing_exporting_meshes_page "importing and exporting meshes in various formats";</li>
+<li>\ref importing_exporting_meshes_page "importing and exporting meshes in various formats";</li>
<li>\subpage modifying_meshes_page "modifying meshes" with a vast
array of dedicated operations;</li>
-<li>\subpage grouping_elements_page "creating groups of mesh elements";</li>
+<li>\subpage grouping_elements_page "creating groups of mesh
+ elements";</li>
<li>filtering mesh entities (nodes or elements) using
\subpage filters_page "Filters" functionality for \ref
grouping_elements_page "creating groups" and applying \ref
<li>\subpage viewing_meshes_overview_page "viewing meshes" in
the VTK viewer;</li>
<li>applying to meshes \subpage quality_page "Quality Controls",
- allowing to highlight important elements;
-<li>taking various \subpage measurements_page "measurements" of the mesh objects.
+ allowing to highlight important elements;</li>
+<li>taking various \subpage measurements_page "measurements" of the
+ mesh objects.</li>
</ul>
It is possible to use the variables predefined in
-\subpage using_notebook_mesh_page "Salome notebook" to set parameters of operations.
+\subpage using_notebook_mesh_page "Salome notebook" to set parameters
+of operations.
-Mesh module preferences are described in the \subpage mesh_preferences_page section of SALOME Mesh Help.
+Mesh module preferences are described in the \subpage mesh_preferences_page
+section of SALOME Mesh Help.
Almost all mesh module functionalities are accessible via
\subpage smeshpy_interface_page "Mesh module Python interface".
in the selected object.</li>
<li><b>Coincident elements</b> is a list of groups of elements for
merging. After the operation all elements of each group will
- be united into one element.
+ be united into one element. The first element of a group is kept and
+ the others are removed.
<ul>
<li>\b Remove button deletes the selected group from the list.</li>
<li>\b Add button adds to the list a group of elements selected in the
<br>
\image html sort.png
<center>moves the selected element to the first position in the
- group.</center>
+ group in order to keep it in the mesh.</center>
<br>
</li>
<li>To confirm your choice click \b Apply or <b>Apply and Close</b> button.</li>
<ul>
<li>\b Detect button generates the list of coincident nodes for the given
\b Tolerance.</li>
-<li><b>Coincident nodes</b> is a list of groups of elements for
- merging. After the operation all elements of each group will
- be united into one element.
+<li><b>Coincident nodes</b> is a list of groups of nodes for
+ merging. After the operation all nodes of each group will
+ be united into one node. The first node of a group is kept and
+ the others are removed.
<ul>
<li>\b Remove button deletes the selected group from the list.</li>
<li>\b Add button adds to the list a group of nodes selected in the
<br>
\image html sort.png
<center>moves the selected node to the first position in the
- group.</center><br>
+ group in order to keep it in the mesh.</center><br>
</li>
</ul>
</li>
this operation will be carried out automatically.
- <b>Mesh computation</b>
- - <b>Show a computation result notification</b> combob-ox allows to
+ - <b>Show a computation result notification</b> combo-box allows to
select the notification mode about a mesh computation result.
There are 3 possible modes:
- <b>Never</b> - do not show the result dialog at all;
criterion. The \b Clear button deletes all criteria.
\n Each <b>Entity type</b> has its specific list of criteria, however all
filters have common syntax. The <b>Threshold Value</b> should be specified
-for each criterion. For numerical criteria it is necessary to indicate if
+for most criteria. For numerical criteria it is necessary to indicate if
the found elements should be \b More, \b Less or \b Equal to this
\b Value. You can also reverse the sense of a criterion using \b Unary
operator \a Not and you should specify logical relations between
types depends on the current entity type.
</li><li>
<b>Entity type</b> allows selection of elements by their type defined
-as a combination of geometry type amd the number of nodes.
+as a combination of geometry type and the number of nodes.
</li>
</ul>
locations of element corners (nodes).
\note Depending on the chosen method and mesh geometry
-the smoothing can actually decrease the quality of elements.
+the smoothing can actually decrease the quality of elements and even
+make some elements inverted.
<em>To apply smoothing to the elements of your mesh:</em>
<ol>
\page uniting_set_of_triangles_page Uniting a set of triangles
-\n It is possible to unite many neighboring triangles (cells) into
+\n It is possible to unite many neighboring triangles into
quadrangles by deletion of the common edge.
<em>To union several triangles:</em>
\page uniting_two_triangles_page Uniting two triangles
-\n In MESH you can union two neighboring triangles (cells) by deletion
+\n In MESH you can union two neighboring triangles by deletion
of the common edge.
<em>To unite two triangles:</em>
</li>
<li>Enter IDs of nodes forming the required edge in the \b Edge field
- (the node IDs must be separated by dashes) or select this edge in
+ (a couple of node IDs separated by a dash) or select this edge in
the 3D viewer.</li>
<li>Click the \b Apply or <b>Apply and Close</b> button.</li>
</ol>
