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=a17569f7cb9188541ad3df343491f3b68bc8e27e;hb=fd1943809d016d0223da20a2a492b157cb17146a;hpb=0635c9fc80f67d1e5dc0e94ec85f487286a92070 diff --git a/doc/salome/gui/SMESH/input/constructing_submeshes.doc b/doc/salome/gui/SMESH/input/constructing_submeshes.doc index a17569f7c..cf276a57b 100644 --- a/doc/salome/gui/SMESH/input/constructing_submeshes.doc +++ b/doc/salome/gui/SMESH/input/constructing_submeshes.doc @@ -1,55 +1,134 @@ /*! -\page constructing_submeshes_page Constructing submeshes - -Submesh is a mesh on a geometrical subobject created with algorithms -and/or hypotheses other than the algorithms and hypotheses assigned to -the parent mesh on the parent object. -

-If a geometrical subobject belongs to several geometrical objects -having different meshes or submeshes, it will be meshed with the -hypotheses of a submesh of a lower dimension.
-For example, a face of a box is meshed with a submesh 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 submesh 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 submesh, will be meshed using algorithms and - hypotheses of any of the two, chosen randomly.
- -\n Construction of a submesh consists of: +\page constructing_submeshes_page Constructing sub-meshes + +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: + +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: + +(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: -
To construct a submesh: +
To construct a sub-mesh: \par -From the \b Mesh menu select Create Submesh or click "Create +From the \b Mesh menu select Create Sub-mesh or click "Create Sum-mesh" button in the toolbar. -\image html image33.gif -
"Create Submesh" button
+
+ \image html image33.gif + "Create Sub-mesh" button +
\par The following dialog box will appear: +\par \image html createmesh-inv2.png \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 -submesh. 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 +in Geometry module beforehand. To start element selection, press \a +Selection button to the right of \b Geometry label. If this button is +already down, then click it to release and then click it again. The +following pop-up menu allowing to choose a way of geometry definition will +appear. + +\par +\image html choose_geom_selection_way.png + +\par +Direct geometry selection enables selecting the sub-shape in the Object +Browser. +Find geometry by mesh element selection activates the following dialog. + +\par +\image html find_geom_by_mesh_elem.png + +\par +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, +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 submesh will be +In the Object Browser the structure of the new sub-mesh will be displayed as follows: \image html image10.jpg @@ -57,14 +136,16 @@ displayed as follows: \par It contains:
See Also a sample TUI Script of a -\ref tui_construction_submesh "Construct Submesh" operation. +\ref tui_construction_submesh "Construct Sub-mesh" operation. */