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

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<h1>Creating groups</h1>
<p class="whs1"><img src="../i_blue.jpg" x-maintain-ratio="TRUE" width="30px" height="30px" border="0" class="img_whs2"> &nbsp;&nbsp;<span
style="font-weight: normal;">In MESH you
can create groups of elements of different types. To create a group of
elements</span><span style="font-weight: normal; margin-left: 40px;">
in the </span><span style="margin-left: 40px;">Mesh</span><span style="font-weight: normal; margin-left: 40px;">
menu select </span><span style="margin-left: 40px;">Create Group</span><span
style="font-weight: normal; margin-left: 40px;">.</span><span style="margin-left: 40px;">
</span></p>
<p class="whs3">To create any group
you should define the following: &nbsp;&nbsp;</p>
<ul type="disc" class="whs4">
<li class=kadov-p><p class="whs5">Mesh:
<span style="font-weight: normal;">the name of the mesh whose elements
will form your group. You can select your mesh in the Objet Browser or
in the 3D viewer.</span></p></li>
<li class=kadov-p><p class="whs3"><span
style="font-weight: bold;"><B>Elements</B></span> <span style="font-weight: bold;"><B>Type</B></span>
set of radio buttons allows to select the type of elements which will
form your group:</p></li>
<ul type="disc" class="whs4">
<li class=kadov-p><p class="whs6">Nodes</p></li>
<li class=kadov-p><p class="whs6">Edges
</p></li>
<li class=kadov-p><p class="whs6">Faces</p></li>
<li class=kadov-p><p class="whs6">Volumes</p></li>
</ul>
<li class=kadov-p><p class="whs3"><span
style="font-weight: bold;"><B>Name </B></span>field allows to enter the name
of your new group.</p></li>
</ul>
<p class="whs3">SALOME Platform distinguishes
between the two Group types: <span style="font-weight: bold;"><B>Standalone
Group</B></span> and <span style="font-weight: bold;"><B>Group on Geometry</B></span>.
&nbsp;</p>
<h3>Standalone Group </h3>
<p class="whs7"><span style="font-weight: bold;"><B>Standalone
Group</B></span> consists of mesh elements, which you can define in two possible
ways.</p>
<ul type="disc" class="whs4">
<li class=kadov-p><p class="whs8">Choosing them manually
with the mouse in the 3D Viewer. You can click on an element in the 3D
viewer and it will be highlighted. After that click the <span style="font-weight: bold;"><B>Add
</B></span>button and the ID of this element will be added to the list. </p></li>
<li class=kadov-p><p class="whs7">Applying Filters. The
<span style="font-weight: bold;"><B>Set filter </B></span>button allows to apply
a definite filter to selection of the elements of your group. See more
about filters on the <a href="../selection_filter_library.htm">Selection
filter library</a> page. &nbsp;&nbsp;</p></li>
</ul>
<p class="whs7">To remove a selected element or elements
from the list click the <span style="font-weight: bold;"><B>Remove </B></span>button.
The <span style="font-weight: bold;"><B>Sort List </B></span>button allows to
sort the list of IDs of mesh elements. </p>
<p class="whs7"><span style="font-weight: bold;"><B>Select from
</B></span>set of fields allows to choose a submesh or an existing group whose
elements of the previously defined type will be added to the list of elements
which will form your group. </p>
<p class="whs7"><span style="font-weight: bold;"><B>Color Number</B></span>
(integer only, ranging from 0 to 9999) - allows to assign to the group
a certain index, for example, defining boundary conditions. This feature
introduces a useful element of preprocessing in Mesh module. Note that
<span style="font-weight: bold;"><B>Color number</B></span> attribute has nothing
to do with the colors used for the display of the elements of the group.</p>
<p class="whs7">&nbsp;</p>
<table x-use-null-cells cellspacing="0" width="100%" class="whs9">
<col class="whs10">
<col class="whs11">
<tr valign="top" class="whs12">
<td width="33.382%" class="whs13">
<p class="whs1"><img src="../pics/creategroup.png" x-maintain-ratio="TRUE" width="312px" height="621px" border="0" class="img_whs14"></td>
<td width="66.618%" class="whs15">
<p class="whs16"><img src="../image130.gif" width="145px" height="150px" align="left" border="0" class="img_whs17"> &nbsp;&nbsp;</p>
<p class="whs16">&nbsp;</p>
<p class="whs16">&nbsp;</p>
<p class="whs16">&nbsp;</p>
<p class="whs16">&nbsp;</p>
<p class="whs16">&nbsp;</p>
<p class="whs16">In this picture the brown cells belong to
a group defined manually.</p>
<p class="whs16">&nbsp;</p>
<p class="whs16">&nbsp;<img src="../image131.gif" width="149px" height="158px" border="0" class="img_whs18"> In this picture the brown cells belong to the group defined
by the criterion <br>
Taper &gt; 0. </p>
<p class="whs16">&nbsp;</p>
<p class="whs16">&nbsp;</td></tr>
</table>
<p class="whs7">&nbsp;</p>
<p class="whs5">&nbsp;&nbsp;&nbsp;See
Also a sample TUI Script of a <a href="../grouping_elements.htm#bookmark">Create
a Standalone Group</a> operation. &nbsp;</p>
<h3>Group on Geometry </h3>
<p class="whs3">To create a group on
geometry check <span style="font-weight: bold;"><B>Group on geometry</B></span>
in the <span style="font-weight: bold;"><B>Group type</B></span> field. <span
style="font-weight: bold;"><B>Group on geometry </B></span>contains the elements
of a certain type belonging to the selected<span style="font-weight: bold;">
<B></B></span>geometrical object. To define a group select in the Objet Browser
or in the 3D viewer a geometrical object from which the elements will
be taken. After confirmation of the operation a new group of mesh elements
will be created.</p>
<p class="whs3">&nbsp;</p>
<table x-use-null-cells cellspacing="0" width="100%" class="whs9">
<col class="whs19">
<col class="whs20">
<tr valign="top" class="whs21">
<td width="33.48%" class="whs22">
<p><img src="../pics/a-creategroup.png" x-maintain-ratio="TRUE" width="312px" height="312px" border="0" class="img_whs23"></td>
<td width="66.52%" class="whs24">
<p><img src="../image132.gif" width="135px" height="150px" border="0" class="img_whs25"> In this picture the cells which belong to a certain face
are selected in green. </td></tr>
</table>
<p class="whs3">&nbsp;</p>
<p class="whs6">&nbsp;&nbsp;&nbsp;See
Also a sample TUI Script of a <a href="../grouping_elements.htm#bookmark5">Create
a Group on Geometry</a><a href="../grouping_elements.htm#bookmark"> </a>operation.
&nbsp;</p>
<p>&nbsp;</p>
<p>&nbsp;</p>
<p class="whs16">&nbsp;</p>
<p class="whs26">&nbsp;</p>
<p>&nbsp;</p>
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