X-Git-Url: http://git.salome-platform.org/gitweb/?p=modules%2Fsmesh.git;a=blobdiff_plain;f=doc%2Fsalome%2Fgui%2FSMESH%2Finput%2Fconstructing_submeshes.doc;h=cf276a57ba70310ec455769135e1539043e236fb;hp=060adae0319fa2d878dd446c71b4d81b5899c63a;hb=fd1943809d016d0223da20a2a492b157cb17146a;hpb=1067ffa6e7e5c394e3a1b17219d8b355a57607cd
diff --git a/doc/salome/gui/SMESH/input/constructing_submeshes.doc b/doc/salome/gui/SMESH/input/constructing_submeshes.doc
index 060adae03..cf276a57b 100644
--- a/doc/salome/gui/SMESH/input/constructing_submeshes.doc
+++ b/doc/salome/gui/SMESH/input/constructing_submeshes.doc
@@ -2,35 +2,76 @@
\page constructing_submeshes_page Constructing sub-meshes
-Sub-mesh is a mesh on a geometrical sub-object created with algorithms
-and/or hypotheses other than the algorithms and hypotheses assigned to
-the parent mesh on the parent object.
-
-If a geometrical sub-object belongs to several geometrical objects
-having different meshes or sub-meshes, it will be meshed with the
-hypotheses of a sub-mesh of a lower dimension.
-For example, a face of a box is meshed with a sub-mesh using algorithms
-and hypotheses other than the parent mesh on the whole box. The face
-and the box share four edges, which will be meshed with algorithms and
-hypotheses of the sub-mesh on the face, because the face is a 2D object
-while the box is a 3D object.
- If the dimensions are the same, an arbitrary algorithm/hypothesis
- will be used. This means that an edge shared by two faces each having
- its own different sub-mesh, will be meshed using algorithms and
- hypotheses of any of the two, chosen randomly. This indeterminacy can
- be fixed by defining \ref submesh_order_anchor "Sub-mesh priority". The
- default sub-meshes priority is such that multi-dimensional algorithms
- are processed first.
-
+By purpose, the sub-mesh is an object used to assign to a sub-shape
+different meshing parameters than those assigned to the main shape.
+
+Structurally, the sub-mesh is a mesh on a certain sub-shape, or a group of
+sub-shapes, possibly generated using different meshing algorithms
+and/or hypotheses than those used to generate the mesh on other
+sub-shapes.
+
+Creation of a sub-mesh allows to control individually meshing of a
+certain sub-shape, thus allowing to get mesh locally coarser or finer, to get
+elements of different types in the same mesh etc.
+
+A sub-shape to create a sub-mesh on should be retrieved from the main shape
+in one of the following ways:
+- In Geometry module, via New Entity > Explode menu.
+- In Geometry module, by creation of a group (New Entity >
+ Group > Create Group menu).
+- In Mesh module, by
+ \ref subshape_by_mesh_elem "selecting a mesh element" generated on a
+ sub-shape of interest. This way is accessible if the mesh is
+ already computed.
+- In Mesh module, by clicking Publish Sub-shape button in a
+ dialog showing \ref meshing_failed_anchor "meshing errors".
+
+
+Internally, definition of meshing parameters to apply for
+discretization of a certain sub-shape, for example an edge of a
+compound of solids, starts from searching an algorithm, 1D as for the
+edge. The following sub-shapes are sequentially checked for presence
+of a sub-mesh where 1D algorithm is assigned:
+
+- the \b edge it-self
+- groups of edges containing the edge, if any
+- \b wires sharing the edge
+- \b faces sharing the edge
+- groups of faces sharing the edge, if any
+- \b shells sharing the edge
+- \b solids sharing the edge
+- groups of solids sharing the edge, if any
+- the main shape
+
+(This sequence of sub-shapes defines priority of sub-meshes. Thus more
+local, i.e. assigned to sub-shape of lower dimension, algorithms and
+hypotheses have higher priority during the search of hypotheses to
+apply.)
+
+As soon as an 1D algorithm is found the search stops and the same
+sequence of sub-shapes is checked to find a main and additional 1D
+hypotheses the found 1D algorithm can take into account.
+
+The multi-dimensional algorithms have higher priority than
+uni-dimensional algorithms if they are assigned to sub-meshes of the
+same priority.
+
+If meshing parameters are defined on sub-meshes of the same priority,
+for example different 1D hypotheses are assigned to two faces sharing
+an edge, an arbitrary algorithm/hypothesis will be used for
+meshing. This indeterminacy can be fixed by
+\ref submesh_order_anchor "Changing" mutual priority of such
+concurrent sub-meshes.
+
\n Construction of a sub-mesh consists of:
- Selecting a mesh which will encapsulate your sub-mesh
-- Selecting a geometrical object for meshing
-- Applying one or several previously described
+
- Selecting a sub-shape for meshing
+- Applying one or several
\ref about_hypo_page "hypotheses" and
\ref basic_meshing_algos_page "meshing algorithms" which will be used
-at computation of this sub-mesh
+for discretization of this sub-shape.
To construct a sub-mesh:
@@ -52,10 +93,11 @@ The following dialog box will appear:
\par
It allows to define the \b Name, the parent \b Mesh and the \b
Geometry (e.g. a face if the parent mesh has been built on box) of the
-sub-mesh. You can define algorithms and hypotheses in the same way as
-in \ref constructing_meshes_page "Create mesh" menu.
+sub-mesh. You can define meshing algorithms and hypotheses in the same way as
+in \ref constructing_meshes_page "Create mesh" dialog.
\par
+\anchor subshape_by_mesh_elem
If the parent mesh is already computed, then you can define the
\b Geometry by picking mesh elements computed on a sub-shape of interest
in the 3D Viewer, i.e. you do not have to extract this sub-shape
@@ -77,12 +119,13 @@ Browser.
\image html find_geom_by_mesh_elem.png
\par
-In this dialog, Element Type defines kind of element to pick in the
-Viewer.
+In this dialog, Element Type defines a kind of element to pick in the
+Viewer.
Instead of picking an element in the Viewer, you can type its
ID in Element ID field.
- Geometry name field allows defining a name of the sub-shape.
-
+ Geometry name field allows defining a name of the sub-shape,
+with which the sub-shape will appear in the Object Browser (if not yet
+there).
\par
In the Object Browser the structure of the new sub-mesh will be
@@ -93,11 +136,13 @@ displayed as follows:
\par
It contains:
-- a reference to the geometrical object on the basis of which the sub-mesh has been constructed;
+- a sub-mesh name (\a SubMeshFace1)
+
- a reference to the geometrical object on the basis of which the
+ sub-mesh has been constructed (Cylindrical Face_1);
- Applied hypotheses folder containing the references to the
-hypotheses applied to the construction of the sub-mesh;
+hypotheses selected at the construction of the sub-mesh;
- Applied algorithms folder containing the references to the
-algorithms applied to the construction of the sub-mesh.
+algorithms selected at the construction of the sub-mesh.
See Also a sample TUI Script of a