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449 lines
11 KiB
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<h1>Creating Meshes</h1>
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<p class="whs1">First of all see <a href="smesh.py_introduction.htm">Example
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of 3d mesh generation</a>, which is an example of good python script style
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for Mesh module. </p>
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<p class="whs1">Other examples of python
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scripts will be also updated soon to use smesh package instead of direct
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usage of idl interface. </p>
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<h3><a name=bookmark>Construction of a Mesh</a></h3>
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<p class="whs2"><span style="font-family: 'Lucida Console', monospace;">import
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geompy</span></p>
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<p class="whs2">import smesh</p>
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<p class="whs2"> </p>
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<p class="whs3"># create a box</p>
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<p class="whs2">box = geompy.MakeBox(0.,
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0., 0., 100., 200., 300.)</p>
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<p class="whs2">idbox = geompy.addToStudy(box,
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"box")</p>
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<p class="whs2"> </p>
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<p class="whs3"># create a mesh</p>
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<p class="whs2">tetra = smesh.Mesh(box,
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"MeshBox")</p>
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<p class="whs2"> </p>
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<p class="whs2">algo1D = tetra.Segment()</p>
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<p class="whs2">algo1D.NumberOfSegments(7)</p>
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<p class="whs2"> </p>
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<p class="whs2">algo2D = tetra.Triangle()</p>
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<p class="whs2">algo2D.MaxElementArea(800.)</p>
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<p class="whs2"> </p>
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<p class="whs2">algo3D = tetra.Tetrahedron(smesh.NETGEN)</p>
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<p class="whs2">algo3D.MaxElementVolume(900.)</p>
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<p class="whs2"> </p>
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<p class="whs3"># compute the mesh</p>
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<p class="whs2">ret = tetra.Compute()</p>
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<p class="whs2">if ret == 0:</p>
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<p class="whs2"> print
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"problem when computing the mesh"</p>
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<p class="whs2">else:</p>
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<p class="whs2"> print
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"mesh computed"</p>
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<p class="whs2"> pass
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</p>
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<p class="whs2"> </p>
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<p class="whs2"> </p>
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<h3><a name=bookmark1>Construction of a Submesh</a></h3>
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<p class="whs4"><span style="font-family: 'Lucida Console', monospace;">from
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geompy import *</span></p>
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<p class="whs4">import smesh</p>
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<p class="whs4"> </p>
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<p class="whs5"># create a box</p>
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<p class="whs4">box = MakeBoxDXDYDZ(10., 10., 10.)</p>
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<p class="whs4">addToStudy(box, "Box")</p>
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<p class="whs4"> </p>
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<p class="whs5"># select one edge of
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the box for definition of a local hypothesis</p>
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<p class="whs4">p5 = MakeVertex(5., 0., 0.)</p>
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<p class="whs4">EdgeX = GetEdgeNearPoint(box, p5)</p>
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<p class="whs4">addToStudyInFather(box, EdgeX, "Edge
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[0,0,0 - 10,0,0]")</p>
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<p class="whs4"> </p>
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<p class="whs5"># create a hexahedral
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mesh on the box</p>
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<p class="whs4">quadra = smesh.Mesh(box, "Box : quadrangle
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2D mesh")</p>
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<p class="whs4"> </p>
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<p class="whs5"># create a regular
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1D algorithm for the faces</p>
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<p class="whs4">algo1D = quadra.Segment()</p>
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<p class="whs4"> </p>
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<p class="whs5"># define "NumberOfSegments"
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hypothesis to cut</p>
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<p class="whs5"># all the edges in
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a fixed number of segments</p>
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<p class="whs4">algo1D.NumberOfSegments(4)</p>
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<p class="whs4"> </p>
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<p class="whs5"># create a quadrangle
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2D algorithm for the faces</p>
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<p class="whs4">quadra.Quadrangle()</p>
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<p class="whs4"> </p>
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<p class="whs5"># construct a submesh
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on the edge with a local hypothesis</p>
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<p class="whs4">algo_local = quadra.Segment(EdgeX)</p>
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<p class="whs4"> </p>
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<p class="whs5"># define "Arithmetic1D"
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hypothesis to cut the edge<span style="margin-top: 0px;
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margin-bottom: 0px;
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font-family: 'Times New Roman', serif;">
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in several segments with increasing arithmetic length</span></p>
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<p class="whs4">algo_local.Arithmetic1D(1, 4)</p>
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<p class="whs4"> </p>
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<p class="whs5"># define "Propagation"
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hypothesis that propagates all other hypotheses</p>
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<p class="whs5"># on all edges of the
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opposite side in case of quadrangular faces</p>
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<p class="whs4">algo_local.Propagation()</p>
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<p class="whs4"> </p>
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<p class="whs5"># compute the mesh</p>
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<p class="whs4">quadra.Compute() </p>
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<p class="whs4"> </p>
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<h3><a name=bookmark2>Editing of a mesh</a></h3>
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<p class="whs4"><span style="font-family: 'Lucida Console', monospace;">import
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geompy</span></p>
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<p class="whs4">import smesh</p>
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<p class="whs4"> </p>
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<p class="whs4">def PrintMeshInfo(theMesh):</p>
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<p class="whs4"> aMesh
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= theMesh.GetMesh()</p>
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<p class="whs4"> print
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"Information about mesh:"</p>
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<p class="whs4"> print
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"Number of nodes :
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", aMesh.NbNodes()</p>
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<p class="whs4"> print
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"Number of edges :
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", aMesh.NbEdges()</p>
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<p class="whs4"> print
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"Number of faces :
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", aMesh.NbFaces()</p>
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<p class="whs4"> print
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"Number of volumes :
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", aMesh.NbVolumes()</p>
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<p class="whs4"> pass</p>
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<p class="whs4"> </p>
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<p class="whs5"># create a box</p>
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<p class="whs4">box = geompy.MakeBox(0., 0., 0., 20.,
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20., 20.)</p>
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<p class="whs4">geompy.addToStudy(box, "box")</p>
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<p class="whs4"> </p>
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<p class="whs5"># select one edge of
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the box for definition of a local hypothesis</p>
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<p class="whs4">subShapeList = geompy.SubShapeAll(box,
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geompy.ShapeType["EDGE"])</p>
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<p class="whs4">edge = subShapeList[0]</p>
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<p class="whs4">name = geompy.SubShapeName(edge, box)</p>
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<p class="whs4">geompy.addToStudyInFather(box, edge, name)</p>
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<p class="whs4"> </p>
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<p class="whs5"># create a mesh</p>
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<p class="whs4">tria = smesh.Mesh(box, "Mesh 2D")</p>
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<p class="whs4">algo1D = tria.Segment()</p>
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<p class="whs4">hyp1 = algo1D.NumberOfSegments(3)</p>
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<p class="whs4">algo2D = tria.Triangle()</p>
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<p class="whs4">hyp2 = algo2D.MaxElementArea(10.)</p>
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<p class="whs4"> </p>
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<p class="whs5"># create a sub-mesh</p>
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<p class="whs4">algo_local = tria.Segment(edge)</p>
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<p class="whs4">hyp3 = algo_local.Arithmetic1D(1, 6)</p>
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<p class="whs4">hyp4 = algo_local.Propagation()</p>
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<p class="whs4"> </p>
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<p class="whs5"># compute the mesh</p>
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<p class="whs4">tria.Compute()</p>
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<p class="whs4">PrintMeshInfo(tria)</p>
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<p class="whs4"> </p>
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<p class="whs5"># remove a local hypothesis</p>
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<p class="whs4">mesh = tria.GetMesh()</p>
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<p class="whs4">mesh.RemoveHypothesis(edge, hyp4)</p>
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<p class="whs4"> </p>
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<p class="whs5"># compute the mesh</p>
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<p class="whs4">tria.Compute()</p>
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<p class="whs4">PrintMeshInfo(tria)</p>
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<p class="whs4"> </p>
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<p class="whs5"># change the value
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of the 2D hypothesis</p>
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<p class="whs4">hyp2.SetMaxElementArea(2.)</p>
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<p class="whs4"> </p>
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<p class="whs5"># compute the mesh</p>
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<p class="whs4">tria.Compute()</p>
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<p class="whs4">PrintMeshInfo(tria) </p>
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<p class="whs6"> </p>
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<h3><a name=bookmark3>Export of a Mesh</a></h3>
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<p class="whs7">import geompy</p>
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<p class="whs7">import smesh</p>
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<p class="whs6"> </p>
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<p class="whs6"># create a box</p>
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<p class="whs7">box = geompy.MakeBox(0.,
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0., 0., 100., 200., 300.)</p>
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<p class="whs7">idbox = geompy.addToStudy(box,
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"box")</p>
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<p class="whs6"> </p>
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<p class="whs6"># create a mesh</p>
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<p class="whs7">tetra = smesh.Mesh(box,
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"MeshBox")</p>
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<p class="whs6"> </p>
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<p class="whs7">algo1D = tetra.Segment()</p>
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<p class="whs7">algo1D.NumberOfSegments(7)</p>
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<p class="whs7"> </p>
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<p class="whs7">algo2D = tetra.Triangle()</p>
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<p class="whs7">algo2D.MaxElementArea(800.)</p>
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<p class="whs7"> </p>
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<p class="whs7">algo3D = tetra.Tetrahedron(smesh.NETGEN)</p>
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<p class="whs7">algo3D.MaxElementVolume(900.)</p>
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<p class="whs6"> </p>
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<p class="whs6"># compute the mesh</p>
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<p class="whs7">tetra.Compute()</p>
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<p class="whs6"> </p>
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<p class="whs6"># export the mesh in a
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MED file</p>
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<p class="whs7">tetra.ExportMED("/tmp/meshMED.med",
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0) </p>
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