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121 lines
4.5 KiB
Plaintext
121 lines
4.5 KiB
Plaintext
/*!
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\page constructing_meshes_page Constructing meshes
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\n Construction of a mesh consists of:
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<ul>
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<li>Selecting a geometrical object for meshing</li>
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<li>Applying \subpage basic_meshing_algos_page "meshing algorithms" and
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\subpage about_hypo_page "hypotheses" which will be used at computation of
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this mesh.</li>
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</ul>
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<em>To construct a mesh:</em>
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<ol>
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<li>In the \b Mesh menu select <b>Create Mesh</b> or click <em>"Create
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Mesh"</em> button in the toolbar.
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\image html image32.png
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<center><em>"Create Mesh" button</em></center>
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The following dialog box will appear:
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\image html createmesh-inv.png
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</li>
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<li>For example, you need to mesh a 3d object.
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\n First, type the name for your mesh in the "Name" box, by default,
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it is "Mesh_1". Then select the object you wish to mesh in the Object
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Browser and click the "Add" button.
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\image html image120.png
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<center><em>"Add" button</em></center>
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Now you can define 1d Algorithm and 1d Hypotheses, which will be
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applied to the edges of your object. (Note that any object has edges,
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even if their existence is not apparent, for example, a sphere has 4
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edges). Click the <em>"Add Hypothesis"</em> button to add a hypothesis.
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\image html image121.png
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<center><em>"Add Hypothesis" button</em></center>
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Click the <em>"Edit Hypothesis"</em> button to define values for the
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current hypothesis.
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\image html image122.png
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<center><em>"Edit Hypothesis" button</em></center>
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The use of additional hypotheses is optional (i.e. you may leave
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"None" in this box).
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Proceed in the same way with 2d and 3d Algorithms and Hypotheses, note
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that the choice of hypotheses depends on the algorithm. There must be
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one Algorithm and one or several Hypotheses for each dimension of your
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object, otherwise you will not get any mesh at all. Of course, if you
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wish to mesh a face, which is a 2d object, you don't need to define 3d
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Algorithm and Hypotheses.
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\n In the <b>Object Browser</b> the structure of the new mesh will be
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displayed as follows:
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\image html image88.jpg
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It contains:
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<ul>
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<li>a reference to the geometrical object on the basis of which the mesh has been constructed;</li>
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<li><b>Applied hypotheses</b> folder containing the references to the
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hypotheses applied to the construction of the mesh;</li>
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<li><b>Applied algorithms</b> folder containing the references to the
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algorithms applied to the construction of the mesh.</li>
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</ul>
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There is an alternative way to create a mesh on an object simply by
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clicking <b>Assign a set of hypotheses</b> button and selecting between
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Automatic Tetrahedralization or Hexahedralization. The program will
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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.</li>
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<li>Now, when everything is ready, select your mesh in the <b>Object
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Browser</b>. From the \b Mesh menu select \b Compute or click "Compute" button of the
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toolbar.
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\image html image28.png
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<center><em>"Compute" button</em></center>
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The Mesh Computation information box appears.
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\image html meshcomputationsucceed.png
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If the mesh computation failed, the information about the cause of the
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failure is provided.
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\image html meshcomputationfail.png
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After you select the error, <b>Show Subshape</b> button allows
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visualizing the geometrical entity that causes it.
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\image html failed_computation.png "Example of the invalid input mesh"
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\Note Mesh Computation Information box does not appear if you set
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"Mesh computation/Show a computation result notification" preference
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to the "Never" value. This option gives the possibility to control mesh
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computation reporting. There are the following possibilities: always
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show information box, only if an error occurs or never.
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By default, the information box is always shown after mesh computation operation.
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<b>Publish Subshape</b> button publishes the subshape, whose meshing
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failed, in GEOM component as a child of the mesh geometry, which
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allows analyzing the problem geometry and creating a submesh on it in
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order to locally tune hypotheses.
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<b>NOTE</b> It is possible to define a 1D or a 2D mesh in a
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python script and then use such submeshes in the construction of a 3D
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mesh. For this, there exist two algorithms: <b>Use existing edges</b> and <b>Use
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existing faces</b>. They are not entirely usable from the GUI, so a
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mesh created using these algorithms should be exported into a python
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script, edited and then imported into the GUi.
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Consider trying a sample script for construction of a mesh from our
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\ref tui_creating_meshes_page "TUI Scripts" section.
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</li>
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</ol>
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*/ |