doc/salome/gui/SMESH/files/constructing_meshes.htm

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 100 <h1>Constructing meshes</h1>
 101
 102 <p class="whs1">Construction of a mesh consists of:</p>
 103
 104 <p class="whs1">&nbsp;</p>
 105
 106 <ul type="disc" class="whs2">
 107
 108         <li class=kadov-p><p class="whs1">Selecting a geometrical
 109  object for meshing</p></li>
 110
 111         <li class=kadov-p><p class="whs1">Applying <a href="about_meshing_algorithms.htm">meshing
 112  algorithms</a> and <a href="about_hypotheses.htm">hypotheses</a> which
 113  will be used at computation of this mesh.</p></li>
 114 </ul>
 115
 116 <p class="whs1">&nbsp;</p>
 117
 118 <p class=TODO>To construct a mesh:</p>
 119
 120 <p class="whs3">1. In the <span style="font-weight: bold;"><B>Mesh
 121  </B></span>menu select<span style="font-weight: bold;"><B> Create Mesh </B></span>or
 122  click <img src="../image32.gif" width="22px" height="24px" border="0" class="img_whs4"> button in the toolbar. The following dialog box will
 123  appear:</p>
 124
 125 <p class="whs3">&nbsp;</p>
 126
 127 <p class="whs5"><img src="../pics/createmesh-inv.png" x-maintain-ratio="TRUE" width="355px" height="296px" border="0" class="img_whs6"></p>
 128
 129 <p class="whs5">&nbsp;</p>
 130
 131 <p class="whs3">2. For example, you need to mesh a 3d object.
 132  </p>
 133
 134 <p class="whs3">First, type the name for your mesh in the
 135  &quot;Name&quot; box, by default, it is &quot;Mesh_1&quot;. Then select
 136  the object you wish to mesh in the Object Browser <img src="../image119.gif" width="173px" height="88px" border="0" class="img_whs7">and click
 137  the <img src="../image120.gif" width="34px" height="29px" border="0" class="img_whs8"> &quot;Add&quot; button. </p>
 138
 139 <p class="whs3">Now you can define 1d Algorithm and 1d Hypotheses,
 140  which will be applied to the edges of your object. (Note that any object
 141  has edges, even if their existence is not apparent, for example, a sphere
 142  has 4 edges). Click the &nbsp;<img src="../image121.gif" width="29px" height="28px" border="0" class="img_whs9"> button to add a hypothesis. Click the <img src="../image122.gif" width="30px" height="29px" border="0" class="img_whs10"> button
 143  to define values for the current hypothesis. The use of additional hypotheses
 144  is optional (i.e. you may leave &quot;None&quot; in this box). &nbsp;&nbsp;</p>
 145
 146 <p class="whs3">&nbsp;</p>
 147
 148 <p class="whs3">Proceed in the same way with 2d and 3d Algorithms
 149  and Hypotheses, note that the choice of hypotheses depends on the algorithm.
 150  There must be one Algorithm and one or several Hypotheses for each dimension
 151  of your object, otherwise you will not get any mesh at all. Of course,
 152  if you wish to mesh a face, which is a 2d object, you don't need to define
 153  3d Algorithm and Hypotheses. </p>
 154
 155 <p class="whs3">In the <span style="font-weight: bold;"><B>Object
 156  Browser</B></span> the structure of the new mesh will be displayed as follows:</p>
 157
 158 <p class="whs3"><img src="../image88.jpg" width="232px" height="142px" align="right" border="0" class="img_whs11">It contains:</p>
 159
 160 <ul type="disc" class="whs2">
 161
 162         <li class=kadov-p><p class="whs3">a reference to the
 163  geometrical object on the basis of which the mesh has been constructed;</p></li>
 164
 165         <li class=kadov-p><p class="whs3"><span style="font-weight: bold;"><B>Applied
 166  hypotheses </B></span>folder containing the references to the hypotheses applied
 167  to the construction of the mesh;</p></li>
 168
 169         <li class=kadov-p><p class="whs3"><span style="font-weight: bold;"><B>Applied
 170  algorithms </B></span>folder containing the references to the algorithms applied
 171  to the construction of the mesh.</p></li>
 172 </ul>
 173
 174 <p class="whs3">&nbsp;</p>
 175
 176 <p class="whs3">There is an alternative way to create a mesh
 177  on an object simply by clicking <span style="font-weight: bold;"><B>Assign
 178  a set of hypotheses </B></span>button and selecting between Automatic Tetrahedralization
 179  or Hexahedralization. &nbsp;The
 180  program will automatically generate a 3D mesh with the most appropriate
 181  settings. In the same way you can apply this functionality for meshing
 182  2D objects, in which case 3D algorithms are not applied. </p>
 183
 184 <p class="whs3">&nbsp;</p>
 185
 186 <p class="whs3">3. Now, when everything is ready, select
 187  your mesh in the <span style="font-weight: bold;"><B>Object Browser</B></span>.
 188  &nbsp;From the
 189  <span style="font-weight: bold;"><B>Mesh </B></span>menu select<span style="font-weight: bold;"><B>
 190  Compute </B></span>or click <img src="../image28.gif" width="25px" height="24px" border="0" class="img_whs12"> button of the toolbar. </p>
 191
 192 <p class="whs3">&nbsp;</p>
 193
 194 <p class="whs3">Consider trying a sample script for construction
 195  of a mesh from our <a href="../constructing_meshes.htm">TUI Scripts</a>
 196  section.</p>
 197
 198 <p class="whs3">&nbsp;</p>
 199
 200 <p>&nbsp;</p>
 201
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