smesh/doc/salome/gui/SMESH/grouping_elements.htm

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<title>Grouping Elements</title>
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<h1>Grouping Elements</h1>
<h3><a name=bookmark>Create a Standalone Group</a></h3>
<p class="whs1">import SMESH_mechanic</p>
<p class="whs1">&nbsp;</p>
<p class="whs1">smesh &nbsp;=
SMESH_mechanic.smesh</p>
<p class="whs1">mesh &nbsp;&nbsp;=
SMESH_mechanic.mesh</p>
<p class="whs1">salome = SMESH_mechanic.salome</p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># Get ids of all faces
with area &gt; 100 </p>
<p class="whs1">aFilter = smesh.GetFilter(smesh.FACE,
smesh.FT_Area, smesh.FT_MoreThan, 100.)</p>
<p class="whs1">&nbsp;</p>
<p class="whs1">anIds = mesh.GetIdsFromFilter(aFilter)
</p>
<p class="whs1">&nbsp;</p>
<p class="whs3"># create a group consisting
of faces with area &gt; 100</p>
<p class="whs1">&nbsp;</p>
<p class="whs1">aGroup = mesh.MakeGroupByIds(&quot;Area
&gt; 100&quot;, smesh.FACE, anIds)</p>
<p class="whs1">&nbsp;</p>
<p class="whs3"><span style="font-family: 'Lucida Console', monospace;">salome.sg.updateObjBrowser(1)</span>
</p>
<p class="whs3">&nbsp;</p>
<p class="whs3"><img src="pics/create_group.png" x-maintain-ratio="TRUE" width="430px" height="391px" border="0" class="img_whs4"></p>
<h3><a name=bookmark5>Create a Group on Geometry</a></h3>
<p class="whs1">import salome</p>
<p class="whs1">import geompy</p>
<p class="whs1">import smesh</p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># create a box</p>
<p class="whs1">box = geompy.MakeBox(0.,
0., 0., 100., 100., 100.)</p>
<p class="whs1">geompy.addToStudy(box,
&quot;box&quot;)</p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># add the first face
of the box to the study</p>
<p class="whs1"><span style="font-family: 'Lucida Console', monospace;">subShapeList
= geompy.SubShapeAll(box, geompy.ShapeType[&quot;FACE&quot;])</span></p>
<p class="whs1">face = subShapeList[0]</p>
<p class="whs1">geompy.addToStudyInFather(box,
face, &quot;face 1&quot;) </p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># create group of edges
on the face</p>
<p class="whs1"><span style="font-family: 'Lucida Console', monospace;">aGeomGroupE
= geompy.CreateGroup(face, geompy.ShapeType[&quot;EDGE&quot;])</span></p>
<p class="whs1">geompy.AddObject(aGeomGroupE,
3)</p>
<p class="whs1">geompy.AddObject(aGeomGroupE,
6)</p>
<p class="whs1">geompy.AddObject(aGeomGroupE,
8)</p>
<p class="whs1">geompy.AddObject(aGeomGroupE,
10)</p>
<p class="whs1">geompy.addToStudyInFather(face,
aGeomGroupE, &quot;Group of Edges&quot;)</p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># create quadrangle
2D mesh on the box</p>
<p class="whs1"><span style="font-family: 'Lucida Console', monospace;">quadra
= smesh.Mesh(box, &quot;Box : quadrangle 2D mesh&quot;)</span></p>
<p class="whs1">algo1D = quadra.Segment()</p>
<p class="whs1">quadra.Quadrangle()</p>
<p class="whs1">algo1D.NumberOfSegments(7)
</p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># compute the mesh</p>
<p class="whs1">quadra.Compute()</p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># create SMESH group
on the face with name &quot;SMESHGroup1&quot;</p>
<p class="whs1"><span style="font-family: 'Lucida Console', monospace;">aSmeshGroup1
= quadra.GroupOnGeom(face, &quot;SMESHGroup1&quot;)</span></p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># create SMESH group
on &lt;aGeomGroupE&gt; with default name</p>
<p class="whs1">aSmeshGroup2 = quadra.GroupOnGeom(aGeomGroupE)
</p>
<p class="whs3">&nbsp;</p>
<p class="whs3"><span style="font-family: 'Lucida Console', monospace;">salome.sg.updateObjBrowser(1)</span>
</p>
<h3><a name=bookmark1>Edit a Group</a></h3>
<p class="whs1">import SMESH_mechanic</p>
<p class="whs1">&nbsp;</p>
<p class="whs1">smesh &nbsp;=
SMESH_mechanic.smesh</p>
<p class="whs1">mesh &nbsp;&nbsp;=
SMESH_mechanic.mesh</p>
<p class="whs1">salome = SMESH_mechanic.salome</p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># Get ids of all faces
with area &gt; 35</p>
<p class="whs1">aFilter = smesh.GetFilter(smesh.FACE,
smesh.FT_Area, smesh.FT_MoreThan, 35.)</p>
<p class="whs1">&nbsp;</p>
<p class="whs1">anIds = mesh.GetIdsFromFilter(aFilter)
</p>
<p class="whs1">&nbsp;</p>
<p class="whs1">print &quot;Criterion:
Area &gt; 35, Nb = &quot;, len(anIds)</p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># create a group by
adding elements with area &gt; 35</p>
<p class="whs1"><span style="font-family: 'Lucida Console', monospace;">aGroup
= mesh.CreateEmptyGroup(smesh.FACE, &quot;Area &gt; 35&quot;)</span></p>
<p class="whs1">aGroup.Add(anIds)
</p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># Get ids of all faces
with area &gt; 40</p>
<p class="whs1">aFilter = smesh.GetFilter(smesh.FACE,
smesh.FT_Area, smesh.FT_MoreThan, 40.)</p>
<p class="whs1">&nbsp;</p>
<p class="whs1">anIds = mesh.GetIdsFromFilter(aFilter)</p>
<p class="whs1">&nbsp;</p>
<p class="whs1">print &quot;Criterion:
Area &gt; 40, Nb = &quot;, len(anIds) </p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># create a group of
elements with area [35; 40] by removing elements with area &gt; 40 from
group aGroup</p>
<p class="whs1">aGroup.Remove(anIds)
</p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># print the result</p>
<p class="whs1">aGroupElemIDs =
aGroup.GetListOfID()</p>
<p class="whs1">&nbsp;</p>
<p class="whs1">print &quot;Criterion:
35 &lt; Area &lt; 40, Nb = &quot;, len(aGroupElemIDs)</p>
<p class="whs1">j = 1</p>
<p class="whs1">for i in range(len(aGroupElemIDs)):</p>
<p class="whs1">&nbsp;&nbsp;if
j &gt; 20: j = 1; print &quot;&quot;</p>
<p class="whs1">&nbsp;&nbsp;print
aGroupElemIDs[i],</p>
<p class="whs1">&nbsp;&nbsp;j
= j + 1</p>
<p class="whs1">&nbsp;&nbsp;pass</p>
<p class="whs1">print &quot;&quot;</p>
<p class="whs1">&nbsp;</p>
<p class="whs1">salome.sg.updateObjBrowser(1)
</p>
<p class="whs3">&nbsp;</p>
<p class="whs3"><img src="pics/editing_groups1.png" x-maintain-ratio="TRUE" width="463px" height="417px" border="0" class="img_whs5"> &nbsp;<img src="pics/editing_groups2.png" x-maintain-ratio="TRUE" width="541px" height="417px" border="0" class="img_whs6"></p>
<h3><a name=bookmark2>Union of two groups</a></h3>
<p class="whs1">import SMESH_mechanic</p>
<p class="whs1">&nbsp;</p>
<p class="whs1">smesh &nbsp;=
SMESH_mechanic.smesh</p>
<p class="whs1">mesh &nbsp;&nbsp;=
SMESH_mechanic.mesh</p>
<p class="whs1">salome = SMESH_mechanic.salome</p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># Criterion : AREA
&gt; 20</p>
<p class="whs1">aFilter = smesh.GetFilter(smesh.FACE,
smesh.FT_Area, smesh.FT_MoreThan, 20.)</p>
<p class="whs1">&nbsp;</p>
<p class="whs1">anIds = mesh.GetIdsFromFilter(aFilter)</p>
<p class="whs1">&nbsp;</p>
<p class="whs1">print &quot;Criterion:
Area &gt; 20, Nb = &quot;, len( anIds ) </p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># create a group by
adding elements with area &gt; 20</p>
<p class="whs1">aGroup1 = mesh.CreateGroup(SMESH.FACE,
&quot;Area &gt; 20&quot;)</p>
<p class="whs1">aGroup1.Add(anIds)</p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># Criterion : AREA
= 20</p>
<p class="whs1"><span style="font-family: 'Lucida Console', monospace;">aFilter
= smesh.GetFilter(smesh.FACE, smesh.FT_Area, smesh.FT_EqualTo, 20.)</span></p>
<p class="whs1">&nbsp;</p>
<p class="whs1">anIds = mesh.GetIdsFromFilter(aFilter)</p>
<p class="whs1">&nbsp;</p>
<p class="whs1">print &quot;Criterion:
Area = 20, Nb = &quot;, len( anIds ) </p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># create a group by
adding elements with area = 20</p>
<p class="whs1">aGroup2 = mesh.CreateEmptyGroup(
smesh.FACE, &quot;Area = 20&quot; )</p>
<p class="whs1">&nbsp;</p>
<p class="whs1">aGroup2.Add(anIds)</p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># create union group
: area &gt;= 20</p>
<p class="whs1"><span style="font-family: 'Lucida Console', monospace;">aGroup3
= mesh.UnionGroups(aGroup1, aGroup2, &quot;Area &gt;= 20&quot;)</span></p>
<p class="whs1">print &quot;Criterion:
Area &gt;= 20, Nb = &quot;, len(aGroup3.GetListOfID())</p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># Criterion : AREA
&lt; 20</p>
<p class="whs1"><span style="font-family: 'Lucida Console', monospace;">aFilter
= smesh.GetFilter(smesh.FACE, smesh.FT_Area, smesh.FT_LessThan, 20.)</span></p>
<p class="whs1">&nbsp;</p>
<p class="whs1">anIds = mesh.GetIdsFromFilter(aFilter)</p>
<p class="whs1">&nbsp;</p>
<p class="whs1">print &quot;Criterion:
Area &lt; 20, Nb = &quot;, len(anIds)</p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># create a group by
adding elements with area &lt; 20</p>
<p class="whs1"><span style="font-family: 'Lucida Console', monospace;">aGroup4
= mesh.CreateEmptyGroup(smesh.FACE, &quot;Area &lt; 20&quot;)</span></p>
<p class="whs1">aGroup4.Add(anIds)</p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># create union group
: area &gt;= 20 and area &lt; 20</p>
<p class="whs1"><span style="font-family: 'Lucida Console', monospace;">aGroup5
= mesh.UnionGroups(aGroup3, aGroup4, &quot;Any Area&quot;)</span></p>
<p class="whs1">print &quot;Criterion:
Any Area, Nb = &quot;, len(aGroup5.GetListOfID())</p>
<p class="whs1">&nbsp;</p>
<p class="whs1">salome.sg.updateObjBrowser(1)
</p>
<p class="whs1">&nbsp;</p>
<p class="whs1"><img src="pics/union_groups1.png" x-maintain-ratio="TRUE" width="394px" height="425px" border="0" class="img_whs7"></p>
<p class="whs1">&nbsp;</p>
<p class="whs1"><img src="pics/union_groups2.png" x-maintain-ratio="TRUE" width="368px" height="379px" border="0" class="img_whs8"> <img src="pics/union_groups3.png" x-maintain-ratio="TRUE" width="344px" height="381px" border="0" class="img_whs9"></p>
<p class="whs1">&nbsp;</p>
<h3><a name=bookmark3>Intersection of two groups</a></h3>
<p class="whs1">import SMESH_mechanic</p>
<p class="whs1">&nbsp;</p>
<p class="whs1">smesh &nbsp;=
SMESH_mechanic.smesh</p>
<p class="whs1">mesh &nbsp;&nbsp;=
SMESH_mechanic.mesh</p>
<p class="whs1">salome = SMESH_mechanic.salome</p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># Criterion : AREA
&gt; 20</p>
<p class="whs1">aFilter = smesh.GetFilter(smesh.FACE,
smesh.FT_Area, smesh.FT_MoreThan, 20.)</p>
<p class="whs1">&nbsp;</p>
<p class="whs1">anIds = mesh.GetIdsFromFilter(aFilter)</p>
<p class="whs1">&nbsp;</p>
<p class="whs1">print &quot;Criterion:
Area &gt; 20, Nb = &quot;, len(anIds) </p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># create a group by
adding elements with area &gt; 20</p>
<p class="whs1">aGroup1 = mesh.CreateGroup(SMESH.FACE,
&quot;Area &gt; 20&quot;)</p>
<p class="whs1">aGroup1.Add(anIds)</p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># Criterion : AREA
&lt; 60</p>
<p class="whs1">aFilter = smesh.GetFilter(smesh.FACE,
smesh.FT_Area, smesh.FT_LessThan, 60.)</p>
<p class="whs1">&nbsp;</p>
<p class="whs1">anIds = mesh.GetIdsFromFilter(aFilter)</p>
<p class="whs1">&nbsp;</p>
<p class="whs1">print &quot;Criterion:
Area &lt; 60, Nb = &quot;, len(anIds) </p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># create a group by
adding elements with area &lt; 60</p>
<p class="whs1">aGroup2 = mesh.CreateGroup(SMESH.FACE,
&quot;Area &lt; 60&quot;)</p>
<p class="whs1">aGroup2.Add(anIds)</p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># create an intersection
of groups : 20 &lt; area &lt; 60</p>
<p class="whs1"><span style="font-family: 'Lucida Console', monospace;">aGroup3
= mesh.IntersectGroups(aGroup1, aGroup2, &quot;20 &lt; Area &lt; 60&quot;)</span></p>
<p class="whs1">print &quot;Criterion:
20 &lt; Area &lt; 60, Nb = &quot;, len(aGroup3.GetListOfID())</p>
<p class="whs1">&nbsp;</p>
<p class="whs1">salome.sg.updateObjBrowser(1)
</p>
<p class="whs3">&nbsp;</p>
<p class="whs3"><img src="pics/intersect_groups1.png" x-maintain-ratio="TRUE" width="314px" height="351px" border="0" class="img_whs10"> &nbsp;<img src="pics/intersect_groups2.png" x-maintain-ratio="TRUE" width="319px" height="351px" border="0" class="img_whs11"> &nbsp;<img src="pics/intersect_groups3.png" x-maintain-ratio="TRUE" width="304px" height="352px" border="0" class="img_whs12"></p>
<h3><a name=bookmark4>Cut of two groups</a></h3>
<p class="whs1">import SMESH_mechanic</p>
<p class="whs1">&nbsp;</p>
<p class="whs1">smesh &nbsp;=
SMESH_mechanic.smesh</p>
<p class="whs1">mesh &nbsp;&nbsp;=
SMESH_mechanic.mesh</p>
<p class="whs1">salome = SMESH_mechanic.salome</p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># Criterion : AREA
&gt; 20</p>
<p class="whs1">aFilter = smesh.GetFilter(smesh.FACE,
smesh.FT_Area, smesh.FT_MoreThan, 20.)</p>
<p class="whs1">&nbsp;</p>
<p class="whs1">anIds = mesh.GetIdsFromFilter(aFilter)</p>
<p class="whs1">&nbsp;</p>
<p class="whs1">print &quot;Criterion:
Area &gt; 20, Nb = &quot;, len(anIds) </p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># create a group by
adding elements with area &gt; 20</p>
<p class="whs1"><span style="font-family: 'Lucida Console', monospace;">aGroupMain
= mesh.MakeGroupByIds(&quot;Area &gt; 20&quot;, smesh.FACE, anIds)</span></p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># Criterion : AREA
&lt; 60</p>
<p class="whs1">aFilter = smesh.GetFilter(smesh.FACE,
smesh.FT_Area, smesh.FT_LessThan, 60.)</p>
<p class="whs1">&nbsp;</p>
<p class="whs1">anIds = mesh.GetIdsFromFilter(aFilter)</p>
<p class="whs1">&nbsp;</p>
<p class="whs1">print &quot;Criterion:
Area &lt; 60, Nb = &quot;, len(anIds) </p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># create a group by
adding elements with area &lt; 60</p>
<p class="whs1"><span style="font-family: 'Lucida Console', monospace;">aGroupTool
= mesh.MakeGroupByIds(&quot;Area &lt; 60&quot;, smesh.FACE, anIds)</span></p>
<p class="whs1">&nbsp;</p>
<p class="whs2"># create a cut of groups
: area &gt;= 60</p>
<p class="whs1"><span style="font-family: 'Lucida Console', monospace;">aGroupRes
= mesh.CutGroups(aGroupMain, aGroupTool, &quot;Area &gt;= 60&quot;)</span></p>
<p class="whs1">print &quot;Criterion:
Area &gt;= 60, Nb = &quot;, len(aGroupRes.GetListOfID())</p>
<p class="whs1">&nbsp;</p>
<p class="whs1">salome.sg.updateObjBrowser(1)
</p>
<p class="whs1">&nbsp;</p>
<p class="whs3"><img src="pics/cut_groups1.png" x-maintain-ratio="TRUE" width="318px" height="355px" border="0" class="img_whs13"> &nbsp;<img src="pics/cut_groups2.png" x-maintain-ratio="TRUE" width="318px" height="355px" border="0" class="img_whs14"> &nbsp;<img src="pics/cut_groups3.png" x-maintain-ratio="TRUE" width="320px" height="354px" border="0" class="img_whs15"></p>
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