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

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<h1>Grouping Elements</h1>
<h3><a name=bookmark>Create a Standalone Group</a></h3>
<p class="whs1"># Attention! This script has been written
using the old approach basing on direct usage of SMESH idl interface.</p>
<p class="whs1"># For the moment smesh package doesn't provide
methods to create a standalone group. </p>
<p class="whs1"># In the next SALOME version the scripts will
be updated to use only the commands from smesh package.</p>
<p class="whs2">&nbsp;</p>
<p class="whs3">import SMESH</p>
<p class="whs3">import SMESH_mechanic</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">smesh &nbsp;=
SMESH_mechanic.smesh</p>
<p class="whs3">mesh &nbsp;&nbsp;=
SMESH_mechanic.mesh</p>
<p class="whs3">salome = SMESH_mechanic.salome</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># Get ids of all faces
with area &gt; 100 </p>
<p class="whs3">aFilterMgr = smesh.CreateFilterManager()</p>
<p class="whs3">aFunctor = aFilterMgr.CreateArea()</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">aPredicate = aFilterMgr.CreateMoreThan()</p>
<p class="whs3">aPredicate.SetNumFunctor(
aFunctor )</p>
<p class="whs3">aPredicate.SetMargin(
100 )</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">aFilter = aFilterMgr.CreateFilter()</p>
<p class="whs3">aFilter.SetPredicate(
aPredicate )</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">anIds = aFilter.GetElementsId(
mesh )</p>
<p class="whs2">&nbsp;</p>
<p class="whs3">&nbsp;</p>
<p class="whs2"># create a group consisting
of faces with area &gt; 100</p>
<p class="whs3">aGroup = mesh.CreateGroup(
SMESH.FACE, &quot;Area &gt; 100&quot; )</p>
<p class="whs3">aGroup.Add( anIds
)</p>
<p class="whs3">&nbsp;</p>
<p class="whs2"><span style="font-family: 'Lucida Console', monospace;">salome.sg.updateObjBrowser(1)</span>
</p>
<p class="whs2">&nbsp;</p>
<p class="whs2"><img src="pics/create_group.png" x-maintain-ratio="TRUE" width="430px" height="391px" border="0" class="img_whs5"></p>
<h3><a name=bookmark5>Create a Group on Geometry</a></h3>
<p class="whs3">import salome</p>
<p class="whs3">import geompy</p>
<p class="whs3">import smesh</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># create a box</p>
<p class="whs3">box = geompy.MakeBox(0.,
0., 0., 100., 100., 100.)</p>
<p class="whs3">geompy.addToStudy(box,
&quot;box&quot;)</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># add the first face
of the box to the study</p>
<p class="whs3">subShapeList = geompy.SubShapeAll(box,
geompy.ShapeType[&quot;FACE&quot;])</p>
<p class="whs3">face = subShapeList[0]</p>
<p class="whs3">geompy.addToStudyInFather(box,
face, &quot;face 1&quot;)</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># create group of edges
on the face</p>
<p class="whs3">aGeomGroupE = geompy.CreateGroup(face,
geompy.ShapeType[&quot;EDGE&quot;])</p>
<p class="whs3">geompy.AddObject(aGeomGroupE,
3)</p>
<p class="whs3">geompy.AddObject(aGeomGroupE,
6)</p>
<p class="whs3">geompy.AddObject(aGeomGroupE,
8)</p>
<p class="whs3">geompy.AddObject(aGeomGroupE,
10)</p>
<p class="whs3">geompy.addToStudyInFather(face,
aGeomGroupE, &quot;Group of Edges&quot;)</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># create quadrangle
2D mesh on the box</p>
<p class="whs3">quadra = smesh.Mesh(box,
&quot;Box : quadrangle 2D mesh&quot;)</p>
<p class="whs3">algo1D = quadra.Segment()</p>
<p class="whs3">quadra.Quadrangle()</p>
<p class="whs3">algo1D.NumberOfSegments(7)</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># compute the mesh</p>
<p class="whs3">quadra.Compute()</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># create SMESH group
on the face with name &quot;SMESHGroup1&quot;</p>
<p class="whs3">aSmeshGroup1 = quadra.Group(face,
&quot;SMESHGroup1&quot;)</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># create SMESH group
on &lt;aGeomGroupE&gt; with default name</p>
<p class="whs3">aSmeshGroup2 = quadra.Group(aGeomGroupE)</p>
<p class="whs2">&nbsp;</p>
<p class="whs2"><span style="font-family: 'Lucida Console', monospace;">salome.sg.updateObjBrowser(1)</span>
</p>
<h3><a name=bookmark1>Edit a Group</a></h3>
<p class="whs6"># Attention! This script has been written
using the old approach basing on direct usage of SMESH idl interface.</p>
<p class="whs6"># For the moment smesh package doesn't
provide methods to edit a group. </p>
<p class="whs6"># In the next SALOME version the scripts
will be updated to use only the commands from smesh package.</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">import SMESH</p>
<p class="whs3">import SMESH_mechanic</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">smesh &nbsp;=
SMESH_mechanic.smesh</p>
<p class="whs3">mesh &nbsp;&nbsp;=
SMESH_mechanic.mesh</p>
<p class="whs3">salome = SMESH_mechanic.salome</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># Get ids of all faces
with area &gt; 35</p>
<p class="whs3">aFilterMgr = smesh.CreateFilterManager()</p>
<p class="whs3">aFunctor = aFilterMgr.CreateArea()</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">aPredicate = aFilterMgr.CreateMoreThan()</p>
<p class="whs3">aPredicate.SetNumFunctor(aFunctor)</p>
<p class="whs3">aPredicate.SetMargin(35.)</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">aFilter = aFilterMgr.CreateFilter()</p>
<p class="whs3">aFilter.SetPredicate(aPredicate)</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">anIds = aFilter.GetElementsId(mesh)</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">print &quot;Criterion:
Area &gt; 35, Nb = &quot;, len(anIds)</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># create a group by
adding elements with area &gt; 35</p>
<p class="whs3">aGroup = mesh.CreateGroup(SMESH.FACE,
&quot;Area &gt; 35&quot;)</p>
<p class="whs3">aGroup.Add(anIds)</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># Get ids of all faces
with area &gt; 40</p>
<p class="whs3">aFunctor = aFilterMgr.CreateArea()</p>
<p class="whs3">aPredicate = aFilterMgr.CreateMoreThan()</p>
<p class="whs3">aPredicate.SetNumFunctor(aFunctor)</p>
<p class="whs3">aPredicate.SetMargin(40.)</p>
<p class="whs3">aFilter = aFilterMgr.CreateFilter()</p>
<p class="whs3">aFilter.SetPredicate(aPredicate)</p>
<p class="whs3">anIds = aFilter.GetElementsId(mesh)</p>
<p class="whs3">print &quot;Criterion:
Area &gt; 40, Nb = &quot;, len(anIds)</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># create a group of
elements with area [35; 40] by removing elements with area &gt; 40 from
group aGroup</p>
<p class="whs3">aGroup.Remove(anIds)</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># print the result</p>
<p class="whs3">aGroupElemIDs =
aGroup.GetListOfID()</p>
<p class="whs3">print &quot;Criterion:
35 &lt; Area &lt; 40, Nb = &quot;, len(aGroupElemIDs)</p>
<p class="whs3">j = 1</p>
<p class="whs3">for i in range(len(aGroupElemIDs)):</p>
<p class="whs3">&nbsp;&nbsp;if
j &gt; 20: j = 1; print &quot;&quot;</p>
<p class="whs3">&nbsp;&nbsp;print
aGroupElemIDs[i],</p>
<p class="whs3">&nbsp;&nbsp;j
= j + 1</p>
<p class="whs3">&nbsp;&nbsp;pass</p>
<p class="whs3">print &quot;&quot;</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">salome.sg.updateObjBrowser(1)
</p>
<p class="whs2">&nbsp;</p>
<p class="whs2"><img src="pics/editing_groups1.png" x-maintain-ratio="TRUE" width="463px" height="417px" border="0" class="img_whs7"> &nbsp;<img src="pics/editing_groups2.png" x-maintain-ratio="TRUE" width="541px" height="417px" border="0" class="img_whs8"></p>
<h3><a name=bookmark2>Union of two groups</a></h3>
<p class="whs1"># Attention! This script has been written
using the old approach basing on direct usage of SMESH idl interface.</p>
<p class="whs1"># For the moment smesh package doesn't provide
methods to create a union of two groups. </p>
<p class="whs1"># In the next SALOME version the scripts will
be updated to use only the commands from smesh package.</p>
<p class="whs3">&nbsp;</p>
<p class="whs3"><span style="font-family: 'Lucida Console', monospace;">import
SMESH</span></p>
<p class="whs3">import SMESH_mechanic</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">smesh &nbsp;=
SMESH_mechanic.smesh</p>
<p class="whs3">mesh &nbsp;&nbsp;=
SMESH_mechanic.mesh</p>
<p class="whs3">salome = SMESH_mechanic.salome</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">aFilterMgr = smesh.CreateFilterManager()</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># Criterion : AREA
&gt; 20</p>
<p class="whs3">aFunctor = aFilterMgr.CreateArea()</p>
<p class="whs3">aPredicate = aFilterMgr.CreateMoreThan()</p>
<p class="whs3">aPredicate.SetNumFunctor(aFunctor)</p>
<p class="whs3">aPredicate.SetMargin(20.)</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">aFilter = aFilterMgr.CreateFilter()</p>
<p class="whs3">aFilter.SetPredicate(aPredicate)</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">anIds = aFilter.GetElementsId(mesh)</p>
<p class="whs3">print &quot;Criterion:
Area &gt; 20, Nb = &quot;, len( anIds )</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># create a group by
adding elements with area &gt; 20</p>
<p class="whs3">aGroup1 = mesh.CreateGroup(SMESH.FACE,
&quot;Area &gt; 20&quot;)</p>
<p class="whs3">aGroup1.Add(anIds)</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># Criterion : AREA
= 20</p>
<p class="whs3">aFunctor = aFilterMgr.CreateArea()</p>
<p class="whs3">aPredicate = aFilterMgr.CreateEqualTo()</p>
<p class="whs3">aPredicate.SetNumFunctor(aFunctor)</p>
<p class="whs3">aPredicate.SetMargin(20.)</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">aFilter = aFilterMgr.CreateFilter()</p>
<p class="whs3">aFilter.SetPredicate(aPredicate)</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">anIds = aFilter.GetElementsId(mesh)</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">print &quot;Criterion:
Area = 20, Nb = &quot;, len( anIds )</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># create a group by
adding elements with area = 20</p>
<p class="whs3">aGroup2 = mesh.CreateGroup(
SMESH.FACE, &quot;Area = 20&quot; )</p>
<p class="whs3">aGroup2.Add(anIds)</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># create union group
: area &gt;= 20</p>
<p class="whs3">aGroup3 = mesh.UnionGroups(aGroup1,
aGroup2, &quot;Area &gt;= 20&quot;)</p>
<p class="whs3">print &quot;Criterion:
Area &gt;= 20, Nb = &quot;, len(aGroup3.GetListOfID())</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># Criterion : AREA
&lt; 20</p>
<p class="whs3">aFunctor = aFilterMgr.CreateArea()</p>
<p class="whs3">aPredicate = aFilterMgr.CreateLessThan()</p>
<p class="whs3">aPredicate.SetNumFunctor(aFunctor)</p>
<p class="whs3">aPredicate.SetMargin(20.)</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">aFilter = aFilterMgr.CreateFilter()</p>
<p class="whs3">aFilter.SetPredicate(aPredicate)</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">anIds = aFilter.GetElementsId(mesh)</p>
<p class="whs3">print &quot;Criterion:
Area &lt; 20, Nb = &quot;, len(anIds)</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># create a group by
adding elements with area &lt; 20</p>
<p class="whs3">aGroup4 = mesh.CreateGroup(SMESH.FACE,
&quot;Area &lt; 20&quot;)</p>
<p class="whs3">aGroup4.Add(anIds)</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># create union group
: area &gt;= 20 and area &lt; 20</p>
<p class="whs3">aGroup5 = mesh.UnionGroups(aGroup3,
aGroup4, &quot;Any Area&quot;)</p>
<p class="whs3">print &quot;Criterion:
Any Area, Nb = &quot;, len(aGroup5.GetListOfID())</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">salome.sg.updateObjBrowser(1)
</p>
<p class="whs3">&nbsp;</p>
<p class="whs3"><img src="pics/union_groups1.png" x-maintain-ratio="TRUE" width="394px" height="425px" border="0" class="img_whs9"></p>
<p class="whs3">&nbsp;</p>
<p class="whs3"><img src="pics/union_groups2.png" x-maintain-ratio="TRUE" width="368px" height="379px" border="0" class="img_whs10"> <img src="pics/union_groups3.png" x-maintain-ratio="TRUE" width="344px" height="381px" border="0" class="img_whs11"></p>
<p class="whs3">&nbsp;</p>
<h3><a name=bookmark3>Intersection of two groups</a></h3>
<p class="whs6"># Attention! This script has been written
using the old approach basing on direct usage of SMESH idl interface.</p>
<p class="whs6"># For the moment smesh package doesn't
provide methods to create an intersection of two groups. </p>
<p class="whs6"># In the next SALOME version the scripts
will be updated to use only the commands from smesh package.</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">import SMESH</p>
<p class="whs3">import SMESH_mechanic</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">smesh &nbsp;=
SMESH_mechanic.smesh</p>
<p class="whs3">mesh &nbsp;&nbsp;=
SMESH_mechanic.mesh</p>
<p class="whs3">salome = SMESH_mechanic.salome</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">aFilterMgr = smesh.CreateFilterManager()</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># Criterion : AREA
&gt; 20</p>
<p class="whs3">aFunctor = aFilterMgr.CreateArea()</p>
<p class="whs3">aPredicate = aFilterMgr.CreateMoreThan()</p>
<p class="whs3">aPredicate.SetNumFunctor(aFunctor)</p>
<p class="whs3">aPredicate.SetMargin(20.)</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">aFilter = aFilterMgr.CreateFilter()</p>
<p class="whs3">aFilter.SetPredicate(aPredicate)</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">anIds = aFilter.GetElementsId(mesh)</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">print &quot;Criterion:
Area &gt; 20, Nb = &quot;, len(anIds)</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># create a group by
adding elements with area &gt; 20</p>
<p class="whs3">aGroup1 = mesh.CreateGroup(SMESH.FACE,
&quot;Area &gt; 20&quot;)</p>
<p class="whs3">aGroup1.Add(anIds)</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># Criterion : AREA
&lt; 60</p>
<p class="whs3">aFunctor = aFilterMgr.CreateArea()</p>
<p class="whs3">aPredicate = aFilterMgr.CreateLessThan()</p>
<p class="whs3">aPredicate.SetNumFunctor(aFunctor)</p>
<p class="whs3">aPredicate.SetMargin(60)</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">aFilter = aFilterMgr.CreateFilter()</p>
<p class="whs3">aFilter.SetPredicate(aPredicate)</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">anIds = aFilter.GetElementsId(mesh)</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">print &quot;Criterion:
Area &lt; 60, Nb = &quot;, len(anIds)</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># create a group by
adding elements with area &lt; 60</p>
<p class="whs3">aGroup2 = mesh.CreateGroup(SMESH.FACE,
&quot;Area &lt; 60&quot;)</p>
<p class="whs3">aGroup2.Add(anIds)</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># create an intersection
of groups : 20 &lt; area &lt; 60</p>
<p class="whs3">aGroup3 = mesh.IntersectGroups(aGroup1,
aGroup2, &quot;20 &lt; Area &lt; 60&quot;)</p>
<p class="whs3">print &quot;Criterion:
20 &lt; Area &lt; 60, Nb = &quot;, len(aGroup3.GetListOfID())</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">salome.sg.updateObjBrowser(1)
</p>
<p class="whs2">&nbsp;</p>
<p class="whs2"><img src="pics/intersect_groups1.png" x-maintain-ratio="TRUE" width="314px" height="351px" border="0" class="img_whs12"> &nbsp;<img src="pics/intersect_groups2.png" x-maintain-ratio="TRUE" width="319px" height="351px" border="0" class="img_whs13"> &nbsp;<img src="pics/intersect_groups3.png" x-maintain-ratio="TRUE" width="304px" height="352px" border="0" class="img_whs14"></p>
<h3><a name=bookmark4>Cut of two groups</a></h3>
<p class="whs1"># Attention! This script has been written
using the old approach basing on direct usage of SMESH idl interface.</p>
<p class="whs1"># For the moment smesh package doesn't provide
methods to create a cut of two groups. </p>
<p class="whs1"># In the next SALOME version the scripts will
be updated to use only the commands from smesh package.</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">import SMESH</p>
<p class="whs3">import SMESH_mechanic</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">smesh &nbsp;=
SMESH_mechanic.smesh</p>
<p class="whs3">mesh &nbsp;&nbsp;=
SMESH_mechanic.mesh</p>
<p class="whs3">salome = SMESH_mechanic.salome</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">aFilterMgr = smesh.CreateFilterManager()</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># Criterion : AREA
&gt; 20</p>
<p class="whs3">aFunctor = aFilterMgr.CreateArea()</p>
<p class="whs3">aPredicate = aFilterMgr.CreateMoreThan()</p>
<p class="whs3">aPredicate.SetNumFunctor(aFunctor)</p>
<p class="whs3">aPredicate.SetMargin(20.)</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">aFilter = aFilterMgr.CreateFilter()</p>
<p class="whs3">aFilter.SetPredicate(aPredicate)</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">anIds = aFilter.GetElementsId(mesh)</p>
<p class="whs3">print &quot;Criterion:
Area &gt; 20, Nb = &quot;, len(anIds)</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># create a group by
adding elements with area &gt; 20</p>
<p class="whs3">aGroupMain = mesh.CreateGroup(SMESH.FACE,
&quot;Area &gt; 20&quot;)</p>
<p class="whs3">aGroupMain.Add(anIds)</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># Criterion : AREA
&lt; 60</p>
<p class="whs3">aFunctor = aFilterMgr.CreateArea()</p>
<p class="whs3">aPredicate = aFilterMgr.CreateLessThan()</p>
<p class="whs3">aPredicate.SetNumFunctor(aFunctor)</p>
<p class="whs3">aPredicate.SetMargin(60.)</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">aFilter = aFilterMgr.CreateFilter()</p>
<p class="whs3">aFilter.SetPredicate(aPredicate)</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">anIds = aFilter.GetElementsId(mesh)</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">print &quot;Criterion:
Area &lt; 60, Nb = &quot;, len(anIds)</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># create a group by
adding elements with area &lt; 60</p>
<p class="whs3">aGroupTool = mesh.CreateGroup(SMESH.FACE,
&quot;Area &lt; 60&quot;)</p>
<p class="whs3">aGroupTool.Add(anIds)</p>
<p class="whs3">&nbsp;</p>
<p class="whs4"># create a cut of groups
: area &gt;= 60</p>
<p class="whs3">aGroupRes = mesh.CutGroups(aGroupMain,
aGroupTool, &quot;Area &gt;= 60&quot;)</p>
<p class="whs3">print &quot;Criterion:
Area &gt;= 60, Nb = &quot;, len(aGroupRes.GetListOfID())</p>
<p class="whs3">salome.sg.updateObjBrowser(1)
</p>
<p class="whs3">&nbsp;</p>
<p class="whs2"><img src="pics/cut_groups1.png" x-maintain-ratio="TRUE" width="318px" height="355px" border="0" class="img_whs15"> &nbsp;<img src="pics/cut_groups2.png" x-maintain-ratio="TRUE" width="318px" height="355px" border="0" class="img_whs16"> &nbsp;<img src="pics/cut_groups3.png" x-maintain-ratio="TRUE" width="320px" height="354px" border="0" class="img_whs17"></p>
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