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<h1>Introduction to MESH module python interface</h1>
<p class="whs1">Package smesh provides
a standard API for creation and edition of meshes . </p>
<p class="whs1">Below you can see an example
of usage of the package smesh for 3d mesh generation. </p>
<p class="whs1"> </p>
<p class="whs1">Example of 3d mesh generation
with NETGEN</p>
<p class="whs1">from geompy import * </p>
<p class="whs1"><span style="font-family: 'Lucida Console', monospace;">import
smesh</span> </p>
<p class="whs1"># Geometry </p>
<p class="whs1"># an assembly of a box,
a cylinder and a truncated cone meshed with tetrahedral. </p>
<p class="whs1"> </p>
<p class="whs1"># Define values </p>
<p class="whs2">name = "ex21_lamp"
</p>
<p class="whs2">cote = 60 </p>
<p class="whs2">section = 20 </p>
<p class="whs2">size = 200 </p>
<p class="whs2">radius_1 = 80 </p>
<p class="whs2">radius_2 = 40 </p>
<p class="whs1"><span style="font-family: 'Lucida Console', monospace;">height
= 100</span> </p>
<p class="whs1"> </p>
<p class="whs1"># Build a box </p>
<p class="whs2">box = MakeBox(-cote,
-cote, -cote, +cote, +cote, +cote) </p>
<p class="whs1"> </p>
<p class="whs1"># Build a cylinder </p>
<p class="whs2">pt1 = MakeVertex(0,
0, cote/3) </p>
<p class="whs2">di1 = MakeVectorDXDYDZ(0,
0, 1) </p>
<p class="whs1"><span style="font-family: 'Lucida Console', monospace;">cyl
= MakeCylinder(pt1, di1, section, size)</span> </p>
<p class="whs1"> </p>
<p class="whs1"># Build a truncated cone
</p>
<p class="whs2">pt2 = MakeVertex(0,
0, size) </p>
<p class="whs1"><span style="font-family: 'Lucida Console', monospace;">cone
= MakeCone(pt2, di1, radius_1, radius_2, height)</span> </p>
<p class="whs1"> </p>
<p class="whs1"># Fuse </p>
<p class="whs2">box_cyl = MakeFuse(box,
cyl) </p>
<p class="whs1"><span style="font-family: 'Lucida Console', monospace;">piece
= MakeFuse(box_cyl, cone)</span> </p>
<p class="whs1"> </p>
<p class="whs1"># Add in study </p>
<p class="whs2">addToStudy(piece,
name) </p>
<p class="whs1"> </p>
<p class="whs1"># Create a group of faces
</p>
<p class="whs2">group = CreateGroup(piece,
ShapeType["FACE"]) </p>
<p class="whs2">group_name = name
+ "_grp" </p>
<p class="whs2">addToStudy(group,
group_name) </p>
<p class="whs1"><span style="font-family: 'Lucida Console', monospace;">group.SetName(group_name)</span>
</p>
<p class="whs1"> </p>
<p class="whs1"># Add faces in the group
</p>
<p class="whs2">faces = SubShapeAllIDs(piece,
ShapeType["FACE"]) </p>
<p class="whs1"><span style="font-family: 'Lucida Console', monospace;">UnionIDs(group,
faces)</span> </p>
<p class="whs1"> </p>
<p class="whs1"># Create a mesh </p>
<p class="whs1"> </p>
<p class="whs1"># Define a mesh on a geometry
</p>
<p class="whs2">tetra = smesh.Mesh(piece,
name) </p>
<p class="whs1"> </p>
<p class="whs1"># Define 1D hypothesis
</p>
<p class="whs2">algo1d = tetra.Segment()
</p>
<p class="whs1"><span style="font-family: 'Lucida Console', monospace;">algo1d.LocalLength(10)</span>
</p>
<p class="whs1"> </p>
<p class="whs1"># Define 2D hypothesis
</p>
<p class="whs2">algo2d = tetra.Triangle()
</p>
<p class="whs1"><span style="font-family: 'Lucida Console', monospace;">algo2d.LengthFromEdges()</span>
</p>
<p class="whs1"> </p>
<p class="whs1"># Define 3D hypothesis
</p>
<p class="whs2">algo3d = tetra.Tetrahedron(smesh.NETGEN)
</p>
<p class="whs1"><span style="font-family: 'Lucida Console', monospace;">algo3d.MaxElementVolume(100)</span>
</p>
<p class="whs1"> </p>
<p class="whs1"># Compute the mesh </p>
<p class="whs2">tetra.Compute()
</p>
<p class="whs1"> </p>
<p class="whs1"># Create a groupe of faces
</p>
<p class="whs2">tetra.Group(group)
</p>
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