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