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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="whs3">import SMESH</p>
<p class="whs3">import SMESH_mechanic</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">mesh &nbsp;&nbsp;=
SMESH_mechanic.mesh</p>
<p class="whs3">salome = SMESH_mechanic.salome</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># translate a mesh</p>
<p class="whs3">anEditor = mesh.GetMeshEditor()</p>
<p class="whs3">point = SMESH.PointStruct(-150, -150,
0)</p>
<p class="whs3">vector = SMESH.DirStruct(point) </p>
<p class="whs3">anEditor.TranslateObject(mesh, vector,
1)</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"><span style="font-family: 'Lucida Console', monospace;">salome.sg.updateObjBrowser(1)</span>
</p>
<p class="whs4">&nbsp;</p>
<h4 class="whs2"><a name=bookmark1>Rotation</a></h4>
<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">import math</p>
<p class="whs3">mesh &nbsp;&nbsp;=
SMESH_mechanic.mesh</p>
<p class="whs3">salome = SMESH_mechanic.salome</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># rotate a mesh </p>
<p class="whs3">anEditor = mesh.GetMeshEditor()</p>
<p class="whs3">axisXYZ = SMESH.AxisStruct(0, 0, 0, 5,
5, 20)</p>
<p class="whs3">angle180 = &nbsp;1.5*math.pi</p>
<p class="whs3">anEditor.RotateObject(mesh, axisXYZ, angle180,
1)</p>
<p class="whs3">&nbsp;</p>
<p class="whs5">salome.sg.updateObjBrowser(1)</p>
<p class="whs4">&nbsp;</p>
<p class="whs4">&nbsp;</p>
<h4 class="whs2"><a name=bookmark2>Symmetry</a></h4>
<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">import math</p>
<p class="whs3">mesh &nbsp;&nbsp;=
SMESH_mechanic.mesh</p>
<p class="whs3">salome = SMESH_mechanic.salome</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># create a symmetrical
copy of the mesh mirrored through a point</p>
<p class="whs3">anEditor = mesh.GetMeshEditor()</p>
<p class="whs3">anEditor.MirrorObject(mesh, SMESH.AxisStruct(0,
0, 0, 0, 0, 0), SMESH.SMESH_MeshEditor.POINT, 1) </p>
<p class="whs3">&nbsp;</p>
<p class="whs4"><span style="font-family: 'Lucida Console', monospace;">salome.sg.updateObjBrowser(1)</span>
</p>
<p class="whs4">&nbsp;</p>
<p class="whs4">&nbsp;</p>
<h4 class="whs2"><a name=bookmark3>Merging
Nodes</a></h4>
<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="whs4">&nbsp;</p>
<p class="whs4"># merge nodes</p>
<p class="whs3">aMeshEditor = mesh.GetMeshEditor()</p>
<p class="whs3">Tolerance = 25.0</p>
<p class="whs3">&nbsp;</p>
<p class="whs3">GroupsOfNodes = aMeshEditor.FindCoincidentNodes(Tolerance)</p>
<p class="whs3">aMeshEditor.MergeNodes(GroupsOfNodes)</p>
<p class="whs3">&nbsp;&nbsp;&nbsp;&nbsp;</p>
<p class="whs4"><span style="font-family: 'Lucida Console', monospace;">salome.sg.updateObjBrowser(1)</span>
</p>
<p class="whs4">&nbsp;</p>
<h4><a name=bookmark8>Merging Elements</a></h4>
<p class="whs5">import geompy</p>
<p class="whs5">import smesh</p>
<p class="whs5">import salome</p>
<p class="whs5">import SMESH</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># 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="whs4">&nbsp;</p>
<p class="whs4"># 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">algo = trias.Segment()</p>
<p class="whs5">algo.NumberOfSegments(6)</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">algo = trias.Triangle()</p>
<p class="whs5">algo.LengthFromEdges()</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">trias.Compute()</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">tri_mesh = trias.GetMesh()</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># create a path mesh</p>
<p class="whs5">px1 = geompy.MakeVertex(100.,
100. &nbsp;,
0. &nbsp;)</p>
<p class="whs5">py1 = geompy.MakeVertex(-100.
&nbsp;, -100.,
0. &nbsp;)</p>
<p class="whs5">pz1 = geompy.MakeVertex(0.
&nbsp;, 0. &nbsp;,
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="whs5">circlemesh = smesh.Mesh(circle,
&quot;Path mesh&quot;)</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">algo = circlemesh.Segment()</p>
<p class="whs5">algo.NumberOfSegments(10)</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">circlemesh.Compute()</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># extrusion of the mesh</p>
<p class="whs5">aMeshEditor = tri_mesh.GetMeshEditor()</p>
<p class="whs5">aMeshEditor.ExtrusionAlongPathObject(tri_mesh,
circlemesh.GetMesh(), circle, 1, 0, [], 0, SMESH.PointStruct(0, 0, 0))</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># 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="whs4">&nbsp;</p>
<p class="whs4"># 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="whs4"><span style="font-family: 'Lucida Console', monospace;">salome.sg.updateObjBrowser(1)</span>
</p>
<h3>Sewing Meshes</h3>
<h4><a name=bookmark4>Sew Meshes Border to Border</a></h4>
<p class="whs5">import salome</p>
<p class="whs5">import geompy</p>
<p class="whs5">import smesh</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># create two faces of a
box</p>
<p class="whs5">box1 = geompy.MakeBox(0.,
0., -10., 30., 20., 25.)</p>
<p class="whs5">subShapeList1 =
geompy.SubShapeAll(box1, geompy.ShapeType[&quot;FACE&quot;])</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">box2 = geompy.MakeBox(0.,
5., 0., 20., 20., 15.)</p>
<p class="whs5">subShapeList2 =
geompy.SubShapeAll(box2, geompy.ShapeType[&quot;FACE&quot;])</p>
<p class="whs5">EdgesList = geompy.SubShapeAll(subShapeList2[
1 ], geompy.ShapeType[&quot;EDGE&quot;])</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">aComp = geompy.MakeCompound(
[subShapeList1[ 2 ], subShapeList2[ 1 ]] )</p>
<p class="whs5">idComp = geompy.addToStudy(
aComp, &quot;Two faces&quot; )</p>
<p class="whs5">aCompobj &nbsp;=
salome.IDToObject( idComp )</p>
<p class="whs5">&nbsp;</p>
<p class="whs4"># create a mesh on two
faces</p>
<p class="whs4">&nbsp;</p>
<p class="whs5">mesh = smesh.Mesh(aCompobj,
&quot;Two faces : quadrangle mesh&quot;)</p>
<p class="whs5">algo = mesh.Segment()</p>
<p class="whs5">&nbsp;</p>
<p class="whs4"># define &quot;NumberOfSegments&quot;
hypothesis to cut an edge in a fixed number of segments</p>
<p class="whs5">algo.NumberOfSegments(9)</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># create a quadrangle 2D
algorithm for faces</p>
<p class="whs5">mesh.Quadrangle()</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># create a local hypothesis</p>
<p class="whs5">algo = mesh.Segment(EdgesList[2])</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># define &quot;Arithmetic1D&quot;
hypothesis to cut an edge in several segments with increasing arithmetic
length </p>
<p class="whs5">algo.Arithmetic1D(1,
4)</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># define &quot;Propagation&quot;
hypothesis that propagates all other hypothesis on all edges on the opposite
side in case of quadrangular faces</p>
<p class="whs5">algo.Propagation()</p>
<p class="whs5">mesh.Compute()</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># sew free borders</p>
<p class="whs5">anEditor = mesh.GetMesh().GetMeshEditor()</p>
<p class="whs5">anEditor.SewBorderToSide(5,
45, 6, 113, 109, 0, 0)</p>
<p class="whs5">&nbsp;</p>
<p class="whs4"><span style="font-family: 'Lucida Console', monospace;">salome.sg.updateObjBrowser(1)</span>
</p>
<p class="whs4">&nbsp;</p>
<h4><a name=bookmark5>Sew Conform Free Borders</a></h4>
<p class="whs5">import salome</p>
<p class="whs5">import geompy</p>
<p class="whs5">import smesh</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># create two faces of the
box</p>
<p class="whs5">box1 = geompy.MakeBox(0.,
0., -10., 20., 20., 15.)</p>
<p class="whs5">subShapeList1 =
geompy.SubShapeAll(box1, geompy.ShapeType[&quot;FACE&quot;])</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">box2 = geompy.MakeBox(0.,
5., 0., 20., 20., 15.)</p>
<p class="whs5">subShapeList2 =
geompy.SubShapeAll(box2, geompy.ShapeType[&quot;FACE&quot;])</p>
<p class="whs5">EdgesList = geompy.SubShapeAll(subShapeList2[
1 ], geompy.ShapeType[&quot;EDGE&quot;])</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">aComp = geompy.MakeCompound(
[subShapeList1[ 2 ], subShapeList2[ 1 ]] )</p>
<p class="whs5">idComp = geompy.addToStudy(
aComp, &quot;Two faces&quot; )</p>
<p class="whs5">aCompobj &nbsp;=
salome.IDToObject( idComp )</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># create a mesh on two
faces</p>
<p class="whs5">mesh = smesh.Mesh(aCompobj,
&quot;Two faces : quadrangle mesh&quot;)</p>
<p class="whs5">algo = mesh.Segment()</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># define &quot;NumberOfSegments&quot;
hypothesis to cut an edge in a fixed number of segments</p>
<p class="whs5">algo.NumberOfSegments(9)</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># create a quadrangle 2D
algorithm for faces</p>
<p class="whs5">mesh.Quadrangle()</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># create a local hypothesis</p>
<p class="whs5">algo = mesh.Segment(EdgesList[2])</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># define &quot;Arithmetic1D&quot;
hypothesis to cut an edge in several segments with increasing arithmetic
length </p>
<p class="whs5">algo.Arithmetic1D(1,
4)</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># define &quot;Propagation&quot;
hypothesis that propagate all other hypothesis on all edges on<span style="margin-top: 0pt; margin-bottom: 0pt;">
the opposite side in case of quadrangular faces</span></p>
<p class="whs5">algo.Propagation()</p>
<p class="whs5">mesh.Compute()</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># sew free borders</p>
<p class="whs5">anEditor = mesh.GetMesh().GetMeshEditor()</p>
<p class="whs5">anEditor.SewConformFreeBorders(5,
45, 6, 3, 24)</p>
<p class="whs4"><span style="font-family: 'Lucida Console', monospace;">salome.sg.updateObjBrowser(1)</span>
</p>
<p class="whs4">&nbsp;</p>
<h4><a name=bookmark6>Sew Free Borders</a></h4>
<p class="whs5">import salome</p>
<p class="whs5">import geompy</p>
<p class="whs5">import smesh</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># create two faces of the
box</p>
<p class="whs5">box1 = geompy.MakeBox(0.,
0., 0., 20., 20., 15.)</p>
<p class="whs5">subShapeList1 =
geompy.SubShapeAll(box1, geompy.ShapeType[&quot;FACE&quot;])</p>
<p class="whs4">&nbsp;</p>
<p class="whs5">box2 = geompy.MakeBox(0.,
5., 0., 20., 20., 15.)</p>
<p class="whs5">subShapeList2 =
geompy.SubShapeAll(box2, geompy.ShapeType[&quot;FACE&quot;])</p>
<p class="whs5">EdgesList = geompy.SubShapeAll(subShapeList2[
1 ], geompy.ShapeType[&quot;EDGE&quot;])</p>
<p class="whs5">&nbsp;</p>
<p class="whs5">aComp = geompy.MakeCompound(
[subShapeList1[ 2 ], subShapeList2[ 1 ]] )</p>
<p class="whs5">idComp = geompy.addToStudy(
aComp, &quot;Two faces&quot; )</p>
<p class="whs5">aCompobj &nbsp;=
salome.IDToObject( idComp )</p>
<p class="whs5">&nbsp;</p>
<p class="whs4"># create a mesh on two
faces</p>
<p class="whs5">mesh = smesh.Mesh(aCompobj,
&quot;Two faces : quadrangle mesh&quot;)</p>
<p class="whs5">algo = mesh.Segment()</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># define &quot;NumberOfSegments&quot;
hypothesis to cut an edge in a fixed number of segments</p>
<p class="whs5">algo.NumberOfSegments(4)</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># creates a quadrangle
2D algorithm for faces</p>
<p class="whs5">mesh.Quadrangle()</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># create a local hypothesis</p>
<p class="whs5">algo = mesh.Segment(EdgesList[2])</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># define &quot;Arithmetic1D&quot;
hypothesis to cut an edge in several segments with &nbsp;increasing
arithmetic length</p>
<p class="whs5">algo.Arithmetic1D(1,
4)</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># define &quot;Propagation&quot;
hypothesis that propagate all other hypothesis on all edges on<span style="margin-top: 0pt; margin-bottom: 0pt;">
the opposite side in case of quadrangular faces</span></p>
<p class="whs5">algo.Propagation()</p>
<p class="whs5">mesh.Compute()</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># sew free borders</p>
<p class="whs5">anEditor = mesh.GetMesh().GetMeshEditor()</p>
<p class="whs5">anEditor.SewFreeBorders(6,
21, 5, 1, 12, 3, 0, 0)</p>
<p class="whs5">&nbsp;</p>
<p class="whs4"><span style="font-family: 'Lucida Console', monospace;">salome.sg.updateObjBrowser(1)</span>
</p>
<p class="whs4">&nbsp;</p>
<h4><a name=bookmark7>Sew Side Elements</a></h4>
<p class="whs5">import salome</p>
<p class="whs5">import geompy</p>
<p class="whs5">import smesh</p>
<p class="whs5">&nbsp;</p>
<p class="whs4"># create two faces of the
box</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">EdgesList = geompy.SubShapeAll(box2,
geompy.ShapeType[&quot;EDGE&quot;])</p>
<p class="whs4">&nbsp;</p>
<p class="whs5">aComp = geompy.MakeCompound(
[box1, box2] )</p>
<p class="whs5">idComp = geompy.addToStudy(
aComp, &quot;Two faces&quot; )</p>
<p class="whs5">aCompobj &nbsp;=
salome.IDToObject( idComp )</p>
<p class="whs5">&nbsp;</p>
<p class="whs4"># create a mesh on two
faces</p>
<p class="whs5">mesh = smesh.Mesh(aCompobj,
&quot;Two faces : quadrangle mesh&quot;)</p>
<p class="whs5">algo = mesh.Segment()</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># define &quot;NumberOfSegments&quot;
hypothesis to cut an edge in a fixed number of segments</p>
<p class="whs5">algo.NumberOfSegments(2)</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># create a quadrangle 2D
algorithm for faces</p>
<p class="whs5">mesh.Quadrangle()</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># create a local hypothesis</p>
<p class="whs5">algo = mesh.Segment(EdgesList[8])</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># define &quot;Arithmetic1D&quot;
hypothesis to cut an edge in several segments with increasing arithmetic
length </p>
<p class="whs5">algo.NumberOfSegments(4)</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># define &quot;Propagation&quot;
hypothesis that propagates all other hypothesis on all edges on <span
style="margin-top: 0pt; margin-bottom: 0pt;">the opposite side in case
of quadrangular faces</span></p>
<p class="whs5">algo.Propagation()</p>
<p class="whs5">mesh.Compute()</p>
<p class="whs4">&nbsp;</p>
<p class="whs4"># sew free borders</p>
<p class="whs5">anEditor = mesh.GetMesh().GetMeshEditor()</p>
<p class="whs5">anEditor.SewSideElements([69,
70, 71, 72], [91, 92, 89, 90], 8, 38, 23, 58)</p>
<p class="whs4"><span style="font-family: 'Lucida Console', monospace;">salome.sg.updateObjBrowser(1)</span>
</p>
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