/*! \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, the hypothesis assigned to a sub-shape with a lower ID will be used for meshing. You can \ref submesh_order_anchor "change" mutual priority of such concurrent sub-meshes. \n Construction of a sub-mesh consists of:
To construct a sub-mesh: \par From the \b Mesh menu select Create Sub-mesh or click "Create Sum-mesh" button in the toolbar.
\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 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 sub-mesh will be displayed as follows: \image html image10.jpg \par It contains:
See Also a sample TUI Script of a \ref tui_construction_submesh "Construct Sub-mesh" operation. */