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

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<title>Introduction to MESH module python interface</title>
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<h1>Introduction to MESH module python interface</h1>
<p><a href="smeshpy_doc/namespacesmesh.html">Package smesh</a> provides a standard API for meshes creation and edition.
<p>Below you can see an example of package <b>smesh</b> usage for 3d mesh generation.
<p>&nbsp;
<h3><a name=bookmark>Example of 3d mesh generation with NETGEN</a></h3>
<br>from geompy import *
<br>
<br>import smesh
<br>
<br># Geometry
<br># ========
<br>
<br># an assembly of a box, a cylinder and a truncated cone meshed with tetrahedral.
<br>
<br># Define values
<br># -------------
<br>
<br>name = "ex21_lamp"
<br>
<br>cote = 60
<br>
<br>section = 20
<br>size = 200
<br>
<br>radius_1 = 80
<br>radius_2 = 40
<br>height = 100
<br>
<br># Build a box
<br># -----------
<br>
<br>box = MakeBox(-cote, -cote, -cote, +cote, +cote, +cote)
<br>
<br># Build a cylinder
<br># ----------------
<br>
<br>pt1 = MakeVertex(0, 0, cote/3)
<br>di1 = MakeVectorDXDYDZ(0, 0, 1)
<br>cyl = MakeCylinder(pt1, di1, section, size)
<br>
<br># Build a truncated cone
<br># ----------------------
<br>
<br>pt2 = MakeVertex(0, 0, size)
<br>cone = MakeCone(pt2, di1, radius_1, radius_2, height)
<br>
<br># Fuse
<br># ----
<br>
<br>box_cyl = MakeFuse(box, cyl)
<br>piece = MakeFuse(box_cyl, cone)
<br>
<br># Add in study
<br># ------------
<br>
<br>addToStudy(piece, name)
<br>
<br># Create a group of faces
<br># -----------------------
<br>
<br>group = CreateGroup(piece, ShapeType["FACE"])
<br>
<br>group_name = name + "_grp"
<br>addToStudy(group, group_name)
<br>group.SetName(group_name)
<br>
<br># Add faces in the group
<br># ----------------------
<br>
<br>faces = SubShapeAllIDs(piece, ShapeType["FACE"])
<br>
<br>UnionIDs(group, faces)
<br>
<br># Create a mesh
<br># =============
<br>
<br># Define a mesh on a geometry
<br># ---------------------------
<br>
<br>tetra = smesh.Mesh(piece, name)
<br>
<br># Define 1D hypothesis
<br># --------------------
<br>
<br>algo1d = tetra.Segment()
<br>algo1d.LocalLength(10)
<br>
<br># Define 2D hypothesis
<br># --------------------
<br>
<br>algo2d = tetra.Triangle()
<br>algo2d.LengthFromEdges()
<br>
<br># Define 3D hypothesis
<br># --------------------
<br>
<br>algo3d = tetra.Tetrahedron(smesh.NETGEN)
<br>algo3d.MaxElementVolume(100)
<br>
<br># Compute the mesh
<br># ----------------
<br>
<br>tetra.Compute()
<br>
<br># Create a groupe of faces
<br># ------------------------
<br>
<br>tetra.Group(group)
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