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207 lines
8.1 KiB
HTML
Executable File
207 lines
8.1 KiB
HTML
Executable File
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<title>Constructing meshes</title>
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<h1>Constructing meshes</h1>
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<p class="whs1">Construction of a mesh consists of:</p>
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<p class="whs1"> </p>
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<ul type="disc" class="whs2">
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<li class=kadov-p><p class="whs1">Selecting a geometrical
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object for meshing</p></li>
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<li class=kadov-p><p class="whs1">Applying <a href="about_meshing_algorithms.htm">meshing
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algorithms</a> and <a href="about_hypotheses.htm">hypotheses</a> which
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will be used at computation of this mesh.</p></li>
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</ul>
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<p class="whs1"> </p>
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<p class=TODO>To construct a mesh:</p>
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<p class="whs3">1. In the <span style="font-weight: bold;"><B>Mesh
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</B></span>menu select<span style="font-weight: bold;"><B> Create Mesh </B></span>or
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click <img src="../image32.gif" width="22px" height="24px" border="0" class="img_whs4"> button in the toolbar. The following dialog box will
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appear:</p>
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<p class="whs3"> </p>
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<p class="whs5"><img src="../pics/c-createmesh.png" x-maintain-ratio="TRUE" width="309px" height="296px" border="0" class="img_whs6"></p>
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<p class="whs5"> </p>
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<p class="whs3">2. For example, you need to mesh a 3d object.
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</p>
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<p class="whs3">First, type the name for your mesh in the
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"Name" box, by default, it is "Mesh_1". Then select
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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
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the <img src="../image120.gif" width="34px" height="29px" border="0" class="img_whs8"> "Add" button. </p>
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<p class="whs3">Now you can define 1d Algorithm and 1d Hypotheses,
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which will be applied to the edges of your object. (Note that any object
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has edges, even if their existence is not apparent, for example, a sphere
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has 4 edges). Click the <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
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to define values for the current hypothesis. The use of additional hypotheses
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is optional (i.e. you may leave "None" in this box). </p>
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<p class="whs3"> </p>
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<p class="whs3">Proceed in the same way with 2d and 3d Algorithms
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and Hypotheses, note that the choice of hypotheses depends on the algorithm.
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There must be one Algorithm and one or several Hypotheses for each dimension
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of your object, otherwise you will not get any mesh at all. Of course,
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if you wish to mesh a face, which is a 2d object, you don't need to define
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3d Algorithm and Hypotheses. </p>
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<p class="whs3">In the <span style="font-weight: bold;"><B>Object
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Browser</B></span> the structure of the new mesh will be displayed as follows:</p>
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<p class="whs3"><img src="../image88.jpg" width="232px" height="142px" align="right" border="0" class="img_whs11">It contains:</p>
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<ul type="disc" class="whs2">
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<li class=kadov-p><p class="whs3">a reference to the
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geometrical object on the basis of which the mesh has been constructed;</p></li>
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<li class=kadov-p><p class="whs3"><span style="font-weight: bold;"><B>Applied
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hypotheses </B></span>folder containing the references to the hypotheses applied
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to the construction of the mesh;</p></li>
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<li class=kadov-p><p class="whs3"><span style="font-weight: bold;"><B>Applied
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algorithms </B></span>folder containing the references to the algorithms applied
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to the construction of the mesh.</p></li>
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</ul>
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<p class="whs3"> </p>
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<p class="whs3">There is an alternative way to create a mesh
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on an object simply by clicking <span style="font-weight: bold;"><B>Assign
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a set of hypotheses </B></span>button and selecting between Automatic Tetrahedralization
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or Hexahedralization. The
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program will automatically generate a 3D mesh with the most appropriate
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settings. In the same way you can apply this functionality for meshing
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2D objects, in which case 3D algorithms are not applied. </p>
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<p class="whs3"> </p>
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<p class="whs3">3. Now, when everything is ready, select
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your mesh in the <span style="font-weight: bold;"><B>Object Browser</B></span>.<span>
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</span><span> From
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the </span><span style="font-weight: bold;"><B>Mesh </B></span><span>menu select</span><span
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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>
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<p class="whs3">If you've done everything right, you'll obtain
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something like this. <img src="../image129.gif" width="293px" height="350px" border="0" class="img_whs13"></p>
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<p class="whs3">Consider trying a sample script for construction
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of a mesh from our <a href="../constructing_meshes.htm">TUI Scripts</a>
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section.</p>
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<p class="whs3"> </p>
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<p> </p>
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