3 \page constructing_submeshes_page Constructing sub-meshes
5 Sub-mesh is a mesh on a geometrical sub-object (sub-shape) used to assign
6 different meshing algorithms and/or hypotheses than the algorithms and
7 hypotheses assigned to the parent mesh on the parent geometrical
8 object, that allows getting a local mesh refinement.
10 A sub-shape to create a sub-mesh on should be retrieved from the shape
11 of the parent mesh in one of the following ways: <ul>
12 <li> In Geometry module, via <em>New Entity > Explode</em> menu.</li>
13 <li> In Geometry module, by creation of a group (<em>New Entity >
14 Group > Create Group</em> menu).</li>
15 <li> In Mesh module, by
16 \ref subshape_by_mesh_elem "selecting a mesh element" generated on a
17 sub-shape of interest. This way is accessible if the mesh is
18 already computed.</li>
21 If a geometrical sub-object belongs to several geometrical objects
22 having different meshes or sub-meshes, it will be meshed with the
23 hypotheses of a sub-mesh of a lower dimension.<br>
24 For example, a face of a box is meshed with a sub-mesh using algorithms
25 and hypotheses other than the parent mesh on the whole box. The face
26 and the box share four edges, which will be meshed with algorithms and
27 hypotheses of the sub-mesh on the face, because the face is a 2D object
28 while the box is a 3D object. <br>
29 If the dimensions are the same, an arbitrary algorithm/hypothesis
30 will be used. This means that an edge shared by two faces each having
31 its own different sub-mesh, will be meshed using algorithms and
32 hypotheses of any of the two, chosen randomly. This indeterminacy can
33 be fixed by defining \ref submesh_order_anchor "Sub-mesh priority". The
34 default sub-meshes priority is such that multi-dimensional algorithms
38 \n Construction of a sub-mesh consists of:
40 <li>Selecting a mesh which will encapsulate your sub-mesh</li>
41 <li>Selecting a geometrical object for meshing</li>
42 <li>Applying one or several previously described
43 \ref about_hypo_page "hypotheses" and
44 \ref basic_meshing_algos_page "meshing algorithms" which will be used
45 at computation of this sub-mesh</li>
48 <br><em>To construct a sub-mesh:</em>
50 From the \b Mesh menu select <b>Create Sub-mesh</b> or click <em>"Create
51 Sum-mesh"</em> button in the toolbar.
54 \image html image33.gif
55 <em>"Create Sub-mesh" button</em>
59 The following dialog box will appear:
62 \image html createmesh-inv2.png
65 It allows to define the \b Name, the parent \b Mesh and the \b
66 Geometry (e.g. a face if the parent mesh has been built on box) of the
67 sub-mesh. You can select meshing algorithms and hypotheses in the same way as
68 in \ref constructing_meshes_page "Create mesh" menu.
71 \anchor subshape_by_mesh_elem
72 If the parent mesh is already computed, then you can define the
73 \b Geometry by picking mesh elements computed on a sub-shape of interest
74 in the 3D Viewer, i.e. you do not have to extract this sub-shape
75 in Geometry module beforehand. To start element selection, press \a
76 Selection button to the right of \b Geometry label. If this button is
77 already down, then click it to release and then click it again. The
78 following pop-up menu allowing to choose a way of geometry definition will
82 \image html choose_geom_selection_way.png
85 <b>Direct geometry selection</b> enables selecting the sub-shape in the Object
87 <b>Find geometry by mesh element selection</b> activates the following dialog.
90 \image html find_geom_by_mesh_elem.png
93 In this dialog, <b> Element Type </b> defines a kind of element to pick in the
95 Instead of picking an element in the Viewer, you can type its
96 ID in <b> Element ID</b> field.
97 <b> Geometry name </b> field allows defining a name of the sub-shape,
98 with which the sub-shape will appear in the Object Browser (if not yet
102 In the Object Browser the structure of the new sub-mesh will be
103 displayed as follows:
105 \image html image10.jpg
110 <li>a sub-mesh name (\a SubMeshFace1)
111 <li>a reference to the geometrical object on the basis of which the
112 sub-mesh has been constructed (<em>Cylindrical Face_1</em>);</li>
113 <li><b>Applied hypotheses</b> folder containing the references to the
114 hypotheses selected at the construction of the sub-mesh;</li>
115 <li><b>Applied algorithms</b> folder containing the references to the
116 algorithms selected at the construction of the sub-mesh.</li>
119 <br><b>See Also</b> a sample TUI Script of a
120 \ref tui_construction_submesh "Construct Sub-mesh" operation.