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

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<title>Transforming Meshes</title>
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<h1>Transforming Meshes</h1>
<h3 class="whs1">Transforming Meshes</h3>
<h4 class="whs2">&nbsp;</h4>
<h4 class="whs2"><a name=bookmark>Translation</a></h4>
<p class="whs3">&nbsp;</p>
<p class="whs4"><span style="font-weight: bold; color: #ff0000;"><font color=red ><B>#
Attention! This script has been written using the old approach basing
on direct usage of SMESH idl interface.</B></font></span></p>
<p class="whs4"># For the moment smesh package doesn't provide
methods to translate meshes. </p>
<p class="whs4"># In the next SALOME version the scripts will
be updated to use only the commands from smesh package.</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">import SMESH</p>
<p class="whs5">import SMESH_mechanic</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">mesh = SMESH_mechanic.mesh</p>
<p class="whs5">anEditor = mesh.GetMeshEditor()</p>
<p class="whs5">&nbsp;</p>
<p class="whs6"># define translation
vector</p>
<p class="whs5">point = SMESH.PointStruct(-150.,
-150., 0.)</p>
<p class="whs5">vector = SMESH.DirStruct(point)</p>
<p class="whs5">&nbsp;</p>
<p class="whs6"># translate a mesh</p>
<p class="whs5">doCopy = 1</p>
<p class="whs5">anEditor.TranslateObject(mesh,
vector, doCopy) </p>
<p class="whs7">&nbsp;</p>
<h4 class="whs2"><a name=bookmark1>Rotation</a></h4>
<p class="whs3">&nbsp;</p>
<p class="whs4"><span style="font-weight: bold; color: #ff0000;"><font color=red ><B>#
Attention! This script has been written using the old approach basing
on direct usage of SMESH idl interface.</B></font></span></p>
<p class="whs4"># For the moment smesh package doesn't provide
methods to rotate meshes. </p>
<p class="whs4"># 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 math</p>
<p class="whs3">import SMESH</p>
<p class="whs3">import SMESH_mechanic</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">mesh = SMESH_mechanic.mesh</p>
<p class="whs3">anEditor = mesh.GetMeshEditor()</p>
<p class="whs3">&nbsp;</p>
<p class="whs6"># define rotation axis
and angle</p>
<p class="whs3">axisXYZ = SMESH.AxisStruct(0., 0., 0.,
5., 5., 20.)</p>
<p class="whs3">angle270 = 1.5 * math.pi</p>
<p class="whs3">&nbsp;</p>
<p class="whs6"># rotate a mesh</p>
<p class="whs3">anEditor.RotateObject(mesh, axisXYZ, angle270,
1) </p>
<p class="whs7">&nbsp;</p>
<h4 class="whs2"><a name=bookmark2>Symmetry</a></h4>
<p class="whs3">&nbsp;</p>
<p class="whs4"><span style="font-weight: bold; color: #ff0000;"><font color=red ><B>#
Attention! This script has been written using the old approach basing
on direct usage of SMESH idl interface.</B></font></span></p>
<p class="whs4"># For the moment smesh package doesn't provide
methods to create symmetrical copies of meshes. </p>
<p class="whs4"># 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 math</p>
<p class="whs3">import SMESH</p>
<p class="whs3">import SMESH_mechanic</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">mesh = SMESH_mechanic.mesh</p>
<p class="whs3">anEditor = mesh.GetMeshEditor()</p>
<p class="whs3">&nbsp;</p>
<p class="whs6"># create a symmetrical
copy of the mesh mirrored through a point</p>
<p class="whs3">axis = SMESH.AxisStruct(0, 0, 0, 0, 0,
0)</p>
<p class="whs3">anEditor.MirrorObject(mesh, axis, SMESH.SMESH_MeshEditor.POINT,
1) </p>
<p class="whs7">&nbsp;</p>
<h4 class="whs2"><a name=bookmark3>Merging
Nodes</a></h4>
<p class="whs3">&nbsp;</p>
<p class="whs4"><span style="font-weight: bold; color: #ff0000;"><font color=red ><B>#
Attention! This script has been written using the old approach basing
on direct usage of SMESH idl interface.</B></font></span></p>
<p class="whs4"># For the moment smesh package doesn't provide
methods to merge nodes. </p>
<p class="whs4"># In the next SALOME version the scripts will
be updated to use only the commands from smesh package.</p>
<p class="whs6">&nbsp;</p>
<p class="whs5">import SMESH_mechanic</p>
<p class="whs5">mesh = SMESH_mechanic.mesh</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">aMeshEditor = mesh.GetMeshEditor()</p>
<p class="whs5">&nbsp;</p>
<p class="whs6"># merge nodes</p>
<p class="whs5">Tolerance = 25.0</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">GroupsOfNodes =
aMeshEditor.FindCoincidentNodes(Tolerance)</p>
<p class="whs7"><span style="font-family: 'Lucida Console', monospace;">aMeshEditor.MergeNodes(GroupsOfNodes)</span>
</p>
<p class="whs7">&nbsp;</p>
<h4><a name=bookmark8>Merging Elements</a></h4>
<p class="whs4"><span style="font-weight: bold; color: #ff0000;"><font color=red ><B>#
Attention! This script has been written using the old approach basing
on direct usage of SMESH idl interface.</B></font></span></p>
<p class="whs4"># For the moment smesh package doesn't provide
methods to merge elements. </p>
<p class="whs4"># In the next SALOME version the scripts will
be updated to use only the commands from smesh package.</p>
<p class="whs6">&nbsp;</p>
<p class="whs5">import salome</p>
<p class="whs5">import geompy</p>
<p class="whs5">import smesh</p>
<p class="whs5">import SMESH</p>
<p class="whs5">&nbsp;</p>
<p class="whs6"># create a face to
be meshed</p>
<p class="whs5">px = geompy.MakeVertex(100.,
0. &nbsp;, 0.
&nbsp;)</p>
<p class="whs5">py = geompy.MakeVertex(0.
&nbsp;, 100.,
0. &nbsp;)</p>
<p class="whs5">pz = geompy.MakeVertex(0.
&nbsp;, 0. &nbsp;,
100.)</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">vxy = geompy.MakeVector(px,
py)</p>
<p class="whs5">arc = geompy.MakeArc(py,
pz, px)</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">wire = geompy.MakeWire([vxy,
arc])</p>
<p class="whs5">isPlanarFace = 1</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">face1 = geompy.MakeFace(wire,
isPlanarFace)</p>
<p class="whs5">id_face1 = geompy.addToStudy(face1,
&quot;Face1&quot;)</p>
<p class="whs5">&nbsp;</p>
<p class="whs6"># create a circle to
be an extrusion path</p>
<p class="whs5">px1 = geompy.MakeVertex(
100., &nbsp;100.,
&nbsp;0.)</p>
<p class="whs5">py1 = geompy.MakeVertex(-100.,
-100., &nbsp;0.)</p>
<p class="whs5">pz1 = geompy.MakeVertex(
&nbsp;&nbsp;0.,
&nbsp;&nbsp;&nbsp;0.,
50.)</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">circle = geompy.MakeCircleThreePnt(py1,
pz1, px1)</p>
<p class="whs5">id_circle = geompy.addToStudy(circle,
&quot;Path&quot;)</p>
<p class="whs5">&nbsp;</p>
<p class="whs6"># create a 2D mesh
on the face</p>
<p class="whs5">trias = smesh.Mesh(face1,
&quot;Face : 2D mesh&quot;)</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">algo1D = trias.Segment()</p>
<p class="whs5">algo1D.NumberOfSegments(6)</p>
<p class="whs5">algo2D = trias.Triangle()</p>
<p class="whs5">algo2D.LengthFromEdges()</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">trias.Compute()</p>
<p class="whs5">tri_mesh = trias.GetMesh()</p>
<p class="whs6">&nbsp;</p>
<p class="whs6"># create a path mesh</p>
<p class="whs5">circlemesh = smesh.Mesh(circle,
&quot;Path mesh&quot;)</p>
<p class="whs5">algo = circlemesh.Segment()</p>
<p class="whs5">algo.NumberOfSegments(10)</p>
<p class="whs5">circlemesh.Compute()</p>
<p class="whs6">&nbsp;</p>
<p class="whs6"># extrusion of the
mesh</p>
<p class="whs5">aMeshEditor = tri_mesh.GetMeshEditor()</p>
<p class="whs5">aMeshEditor.ExtrusionAlongPathObject(tri_mesh,
circlemesh.GetMesh(), circle,</p>
<p class="whs5">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1,
0, [], 0, SMESH.PointStruct(0, 0, 0))</p>
<p class="whs6"># merge nodes</p>
<p class="whs5">print &quot;Number
of nodes before MergeNodes:&quot;, tri_mesh.NbNodes()</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">tolerance = 0.001</p>
<p class="whs5">array_of_nodes_groups
= aMeshEditor.FindCoincidentNodes(tolerance)</p>
<p class="whs5">aMeshEditor.MergeNodes(array_of_nodes_groups)</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">print &quot;Number
of nodes after MergeNodes:&quot;, tri_mesh.NbNodes()</p>
<p class="whs5">print &quot;&quot;</p>
<p class="whs5">print &quot;Number
of elements before MergeEqualElements:&quot;</p>
<p class="whs5">print &quot;Edges
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;:
&quot;, tri_mesh.NbEdges()</p>
<p class="whs5">print &quot;Triangles
&nbsp;: &quot;,
tri_mesh.NbTriangles()</p>
<p class="whs5">print &quot;Quadrangles:
&quot;, tri_mesh.NbQuadrangles()</p>
<p class="whs5">print &quot;Volumes
&nbsp;&nbsp;&nbsp;:
&quot;, tri_mesh.NbVolumes()</p>
<p class="whs6">&nbsp;</p>
<p class="whs6"># merge elements</p>
<p class="whs5">aMeshEditor.MergeEqualElements()</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">print &quot;Number
of elements after MergeEqualElements:&quot;</p>
<p class="whs5">print &quot;Edges
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;:
&quot;, tri_mesh.NbEdges()</p>
<p class="whs5">print &quot;Triangles
&nbsp;: &quot;,
tri_mesh.NbTriangles()</p>
<p class="whs5">print &quot;Quadrangles:
&quot;, tri_mesh.NbQuadrangles()</p>
<p class="whs5">print &quot;Volumes
&nbsp;&nbsp;&nbsp;:
&quot;, tri_mesh.NbVolumes()</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">salome.sg.updateObjBrowser(1)
</p>
<p class="whs5">&nbsp;</p>
<h3>Sewing Meshes</h3>
<h4><a name=bookmark4>Sew Meshes Border to Border</a></h4>
<p class="whs4"><span style="font-weight: bold; color: #ff0000;"><font color=red ><B>#
Attention! This script has been written using the old approach basing
on direct usage of SMESH idl interface.</B></font></span></p>
<p class="whs4"># For the moment smesh package doesn't provide
methods to sew meshes border to border. </p>
<p class="whs4"># In the next SALOME version the scripts will
be updated to use only the commands from smesh package.</p>
<p class="whs7">&nbsp;</p>
<p class="whs5">import geompy</p>
<p class="whs5">import smesh</p>
<p class="whs5">&nbsp;</p>
<p class="whs6"># create two faces
of a box</p>
<p class="whs5">box1 = geompy.MakeBox(0.,
0., -10., 30., 20., 25.)</p>
<p class="whs5">facesList1 = geompy.SubShapeAll(box1,
geompy.ShapeType[&quot;FACE&quot;])</p>
<p class="whs5">face1 = facesList1[2]</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">box2 = geompy.MakeBox(0.,
5., 0., 20., 20., 15.)</p>
<p class="whs5">facesList2 = geompy.SubShapeAll(box2,
geompy.ShapeType[&quot;FACE&quot;])</p>
<p class="whs5">face2 = facesList2[1]</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">edgesList = geompy.SubShapeAll(face2,
geompy.ShapeType[&quot;EDGE&quot;])</p>
<p class="whs5">edge1 = edgesList[2]</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">aComp = geompy.MakeCompound([face1,
face2])</p>
<p class="whs5">geompy.addToStudy(aComp,
&quot;Two faces&quot;)</p>
<p class="whs5">&nbsp;</p>
<p class="whs6"># create a mesh on
two faces</p>
<p class="whs5">mesh = smesh.Mesh(aComp,
&quot;Two faces : quadrangle mesh&quot;)</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">algo1D = mesh.Segment()</p>
<p class="whs5">algo1D.NumberOfSegments(9)</p>
<p class="whs5">algo2D = mesh.Quadrangle()</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">algo_local = mesh.Segment(edge1)</p>
<p class="whs5">algo_local.Arithmetic1D(1,
4)</p>
<p class="whs5">algo_local.Propagation()</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">mesh.Compute()</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">anEditor = mesh.GetMesh().GetMeshEditor()</p>
<p class="whs5">&nbsp;</p>
<p class="whs6"># sew border to side</p>
<p class="whs6"># FirstNodeIDOnFreeBorder,
SecondNodeIDOnFreeBorder, LastNodeIDOnFreeBorder,</p>
<p class="whs6"># FirstNodeIDOnSide,
LastNodeIDOnSide,</p>
<p class="whs6"># CreatePolygons, CreatePolyedrs</p>
<p class="whs5">anEditor.SewBorderToSide(5,
45, 6, 113, 109, 0, 0) </p>
<h4><a name=bookmark5>Sew Conform Free Borders</a></h4>
<p class="whs4"><span style="font-weight: bold; color: #ff0000;"><font color=red ><B>#
Attention! This script has been written using the old approach basing
on direct usage of SMESH idl interface.</B></font></span></p>
<p class="whs4"># For the moment smesh package doesn't provide
methods to sew conform free borders. </p>
<p class="whs4"># In the next SALOME version the scripts will
be updated to use only the commands from smesh package.</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">import geompy</p>
<p class="whs5">import smesh</p>
<p class="whs5">&nbsp;</p>
<p class="whs6"># create two faces
of the box</p>
<p class="whs5">box1 = geompy.MakeBox(0.,
0., -10., 20., 20., 15.)</p>
<p class="whs5">facesList1 = geompy.SubShapeAll(box1,
geompy.ShapeType[&quot;FACE&quot;])</p>
<p class="whs5">face1 = facesList1[2]</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">box2 = geompy.MakeBox(0.,
5., 0., 20., 20., 15.)</p>
<p class="whs5">facesList2 = geompy.SubShapeAll(box2,
geompy.ShapeType[&quot;FACE&quot;])</p>
<p class="whs5">face2 = facesList2[1]</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">edgesList = geompy.SubShapeAll(face2,
geompy.ShapeType[&quot;EDGE&quot;])</p>
<p class="whs5">edge1 = edgesList[2]</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">aComp = geompy.MakeCompound([face1,
face2])</p>
<p class="whs5">geompy.addToStudy(aComp,
&quot;Two faces&quot;)</p>
<p class="whs5">&nbsp;</p>
<p class="whs6"># create a mesh on
two faces</p>
<p class="whs5">mesh = smesh.Mesh(aComp,
&quot;Two faces : quadrangle mesh&quot;)</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">algo1D = mesh.Segment()</p>
<p class="whs5">algo1D.NumberOfSegments(9)</p>
<p class="whs5">algo2D = mesh.Quadrangle()</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">algo_local = mesh.Segment(edge1)</p>
<p class="whs5">algo_local.Arithmetic1D(1,
4)</p>
<p class="whs5">algo_local.Propagation()</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">mesh.Compute()</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">anEditor = mesh.GetMesh().GetMeshEditor()</p>
<p class="whs5">&nbsp;</p>
<p class="whs6"># sew conform free
borders</p>
<p class="whs6"># FirstNodeID1, SecondNodeID1,
LastNodeID1, FirstNodeID2, SecondNodeID2</p>
<p class="whs5">anEditor.SewConformFreeBorders(5,
45, 6, 3, 24) </p>
<h4><a name=bookmark6>Sew Free Borders</a></h4>
<p class="whs4"><span style="font-weight: bold; color: #ff0000;"><font color=red ><B>#
Attention! This script has been written using the old approach basing
on direct usage of SMESH idl interface.</B></font></span></p>
<p class="whs4"># For the moment smesh package doesn't provide
methods to sew free borders. </p>
<p class="whs4"># In the next SALOME version the scripts will
be updated to use only the commands from smesh package.</p>
<p class="whs7">&nbsp;</p>
<p class="whs5">import geompy</p>
<p class="whs5">import smesh</p>
<p class="whs5">&nbsp;</p>
<p class="whs6"># create two faces
of the box</p>
<p class="whs5">box1 = geompy.MakeBox(0.,
0., 0., 20., 20., 15.)</p>
<p class="whs5">facesList1 = geompy.SubShapeAll(box1,
geompy.ShapeType[&quot;FACE&quot;])</p>
<p class="whs5">face1 = facesList1[2]</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">box2 = geompy.MakeBox(0.,
5., 0., 20., 20., 15.)</p>
<p class="whs5">facesList2 = geompy.SubShapeAll(box2,
geompy.ShapeType[&quot;FACE&quot;])</p>
<p class="whs5">face2 = facesList2[1]</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">edgesList = geompy.SubShapeAll(face2,
geompy.ShapeType[&quot;EDGE&quot;])</p>
<p class="whs5">edge1 = edgesList[2]</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">aComp = geompy.MakeCompound([face1,
face2])</p>
<p class="whs5">geompy.addToStudy(aComp,
&quot;Two faces&quot;)</p>
<p class="whs5">&nbsp;</p>
<p class="whs6"># create a mesh on
two faces</p>
<p class="whs5">mesh = smesh.Mesh(aComp,
&quot;Two faces : quadrangle mesh&quot;)</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">algo1D = mesh.Segment()</p>
<p class="whs5">algo1D.NumberOfSegments(4)</p>
<p class="whs5">algo2D = mesh.Quadrangle()</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">algo_local = mesh.Segment(edge1)</p>
<p class="whs5">algo_local.Arithmetic1D(1,
4)</p>
<p class="whs5">algo_local.Propagation()</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">mesh.Compute()</p>
<p class="whs5">&nbsp;</p>
<p class="whs6"># sew free borders</p>
<p class="whs6"># FirstNodeID1, SecondNodeID1,
LastNodeID1,</p>
<p class="whs6"># FirstNodeID2, SecondNodeID2,
LastNodeID2, CreatePolygons, CreatePolyedrs</p>
<p class="whs5">anEditor = mesh.GetMesh().GetMeshEditor()</p>
<p class="whs7"><span style="font-family: 'Lucida Console', monospace;">anEditor.SewFreeBorders(6,
21, 5, 1, 12, 3, 0, 0)</span> </p>
<h4><a name=bookmark7>Sew Side Elements</a></h4>
<p class="whs4"><span style="font-weight: bold; color: #ff0000;"><font color=red ><B>#
Attention! This script has been written using the old approach basing
on direct usage of SMESH idl interface.</B></font></span></p>
<p class="whs4"># For the moment smesh package doesn't provide
methods to sew side elements. </p>
<p class="whs4"># In the next SALOME version the scripts will
be updated to use only the commands from smesh package.</p>
<p class="whs5">import geompy</p>
<p class="whs5">import smesh</p>
<p class="whs5">&nbsp;</p>
<p class="whs6"># create two boxes</p>
<p class="whs5">box1 = geompy.MakeBox(0.,
&nbsp;0., 0.,
10., 10., 10.)</p>
<p class="whs5">box2 = geompy.MakeBox(0.,
15., 0., 20., 25., 10.)</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">EdgesList = geompy.SubShapeAll(box2,
geompy.ShapeType[&quot;EDGE&quot;])</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">aComp = geompy.MakeCompound([box1,
box2])</p>
<p class="whs5">geompy.addToStudy(aComp,
&quot;Two boxes&quot;)</p>
<p class="whs5">&nbsp;</p>
<p class="whs6"># create a mesh on
two boxes</p>
<p class="whs5">mesh = smesh.Mesh(aComp,
&quot;Two faces : quadrangle mesh&quot;)</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">algo1D = mesh.Segment()</p>
<p class="whs5">algo1D.NumberOfSegments(2)</p>
<p class="whs5">algo2D = mesh.Quadrangle()</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">algo_local = mesh.Segment(EdgesList[8])</p>
<p class="whs5">algo_local.NumberOfSegments(4)</p>
<p class="whs5">algo_local.Propagation()</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">mesh.Compute()</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">anEditor = mesh.GetMesh().GetMeshEditor()</p>
<p class="whs5">&nbsp;</p>
<p class="whs6"># sew side elements</p>
<p class="whs6"># IDsOfSide1Elements,
IDsOfSide2Elements,</p>
<p class="whs6"># NodeID1OfSide1ToMerge,
NodeID1OfSide2ToMerge, NodeID2OfSide1ToMerge, NodeID2OfSide2ToMerge</p>
<p class="whs5">anEditor.SewSideElements([69,
70, 71, 72], [91, 92, 89, 90], 8, 38, 23, 58)</p>
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