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

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<h1>Constructing meshes</h1>

<p class="whs1">Construction of a mesh consists of:</p>

<p class="whs1">&nbsp;</p>

<ul type="disc" class="whs2">

	<li class=kadov-p><p class="whs1">Selecting a geometrical
 object for meshing</p></li>

	<li class=kadov-p><p class="whs1">Applying <a href="about_meshing_algorithms.htm">meshing
 algorithms</a> and <a href="about_hypotheses.htm">hypotheses</a> which
 will be used at computation of this mesh.</p></li>
</ul>

<p class="whs1">&nbsp;</p>

<p class=TODO>To construct a mesh:</p>

<p class="whs3">1. In the <span style="font-weight: bold;"><B>Mesh
 </B></span>menu select<span style="font-weight: bold;"><B> Create Mesh </B></span>or
 click <img src="../image32.gif" width="22px" height="24px" border="0" class="img_whs4"> button in the toolbar. The following dialog box will
 appear:</p>

<p class="whs3">&nbsp;</p>

<p class="whs5"><img src="../pics/c-createmesh.png" x-maintain-ratio="TRUE" width="309px" height="296px" border="0" class="img_whs6"></p>

<p class="whs5">&nbsp;</p>

<p class="whs3">2. For example, you need to mesh a 3d object.
 </p>

<p class="whs3">First, type the name for your mesh in the
 &quot;Name&quot; box, by default, it is &quot;Mesh_1&quot;. Then select
 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
 the <img src="../image120.gif" width="34px" height="29px" border="0" class="img_whs8"> &quot;Add&quot; button. </p>

<p class="whs3">Now you can define 1d Algorithm and 1d Hypotheses,
 which will be applied to the edges of your object. (Note that any object
 has edges, even if their existence is not apparent, for example, a sphere
 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
 to define values for the current hypothesis. The use of additional hypotheses
 is optional (i.e. you may leave &quot;None&quot; in this box). &nbsp;&nbsp;</p>

<p class="whs3">&nbsp;</p>

<p class="whs3">Proceed in the same way with 2d and 3d Algorithms
 and Hypotheses, note that the choice of hypotheses depends on the algorithm.
 There must be one Algorithm and one or several Hypotheses for each dimension
 of your object, otherwise you will not get any mesh at all. Of course,
 if you wish to mesh a face, which is a 2d object, you don't need to define
 3d Algorithm and Hypotheses. </p>

<p class="whs3">In the <span style="font-weight: bold;"><B>Object
 Browser</B></span> the structure of the new mesh will be displayed as follows:</p>

<p class="whs3"><img src="../image88.jpg" width="232px" height="142px" align="right" border="0" class="img_whs11">It contains:</p>

<ul type="disc" class="whs2">

	<li class=kadov-p><p class="whs3">a reference to the
 geometrical object on the basis of which the mesh has been constructed;</p></li>

	<li class=kadov-p><p class="whs3"><span style="font-weight: bold;"><B>Applied
 hypotheses </B></span>folder containing the references to the hypotheses applied
 to the construction of the mesh;</p></li>

	<li class=kadov-p><p class="whs3"><span style="font-weight: bold;"><B>Applied
 algorithms </B></span>folder containing the references to the algorithms applied
 to the construction of the mesh.</p></li>
</ul>

<p class="whs3">&nbsp;</p>

<p class="whs3">There is an alternative way to create a mesh
 on an object simply by clicking <span style="font-weight: bold;"><B>Assign
 a set of hypotheses </B></span>button and selecting between Automatic Tetrahedralization
 or Hexahedralization. &nbsp;The
 program will automatically generate a 3D mesh with the most appropriate
 settings. In the same way you can apply this functionality for meshing
 2D objects, in which case 3D algorithms are not applied. </p>

<p class="whs3">&nbsp;</p>

<p class="whs3">3. Now, when everything is ready, select
 your mesh in the <span style="font-weight: bold;"><B>Object Browser</B></span>.<span>
 </span><span>&nbsp;From
 the </span><span style="font-weight: bold;"><B>Mesh </B></span><span>menu select</span><span
 style="font-weight: bold;"><B> Compute </B></span><span>or click <img src="../image28.gif" width="25px" height="24px" border="0" class="img_whs12"> button of the toolbar. </span></p>

<p class="whs3">If you've done everything right, you'll obtain
 something like this. <img src="../image129.gif" width="293px" height="350px" border="0" class="img_whs13"></p>

<p class="whs3">Consider trying a sample script for construction
 of a mesh from our <a href="../constructing_meshes.htm">TUI Scripts</a>
 section.</p>

<p class="whs3">&nbsp;</p>

<p>&nbsp;</p>

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