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105 lines
2.4 KiB
Python
105 lines
2.4 KiB
Python
# 3d mesh generation and mesh exploration
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import salome
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salome.salome_init()
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from salome.geom import geomBuilder
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geompy = geomBuilder.New(salome.myStudy)
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import SMESH
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from salome.smesh import smeshBuilder
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smesh = smeshBuilder.New(salome.myStudy)
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###
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# Geometry: an assembly of a box, a cylinder and a truncated cone
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# to be meshed with tetrahedra
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###
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# Define values
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name = "ex21_lamp"
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cote = 60
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section = 20
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size = 200
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radius_1 = 80
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radius_2 = 40
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height = 100
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# Build a box
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box = geompy.MakeBox(-cote, -cote, -cote, +cote, +cote, +cote)
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# Build a cylinder
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pt1 = geompy.MakeVertex(0, 0, cote/3)
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di1 = geompy.MakeVectorDXDYDZ(0, 0, 1)
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cyl = geompy.MakeCylinder(pt1, di1, section, size)
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# Build a truncated cone
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pt2 = geompy.MakeVertex(0, 0, size)
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cone = geompy.MakeCone(pt2, di1, radius_1, radius_2, height)
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# Fuse
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box_cyl = geompy.MakeFuse(box, cyl)
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piece = geompy.MakeFuse(box_cyl, cone)
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# Add to the study
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geompy.addToStudy(piece, name)
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# Create a group of faces
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faces_group = geompy.CreateGroup(piece, geompy.ShapeType["FACE"])
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group_name = name + "_grp"
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geompy.addToStudy(faces_group, group_name)
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faces_group.SetName(group_name)
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# Add faces to the group
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faces = geompy.SubShapeAllIDs(piece, geompy.ShapeType["FACE"])
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geompy.UnionIDs(faces_group, faces)
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###
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# Create a mesh
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###
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# Define a mesh on a geometry
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tetra = smesh.Mesh(piece, name)
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# Define 1D algorithm and hypothesis
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algo1d = tetra.Segment()
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algo1d.LocalLength(10)
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# Define 2D algorithm and hypothesis
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algo2d = tetra.Triangle()
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algo2d.LengthFromEdges()
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# Define 3D algorithm and hypothesis
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algo3d = tetra.Tetrahedron()
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algo3d.MaxElementVolume(100)
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# Compute the mesh
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tetra.Compute()
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# Create a mesh group of all triangles generated on geom faces present in faces_group
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group = tetra.Group(faces_group)
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###
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# Explore the mesh
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###
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# Retrieve coordinates of nodes
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coordStr = ""
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for node in tetra.GetNodesId():
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x,y,z = tetra.GetNodeXYZ( node )
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coordStr += "%s (%s, %s, %s) " % ( node, x,y,z )
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pass
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# Retrieve nodal connectivity of triangles
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triaStr = ""
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for tria in tetra.GetElementsByType( SMESH.FACE ):
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nodes = tetra.GetElemNodes( tria )
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triaStr += "%s (%s, %s, %s) " % ( tria, nodes[0], nodes[1], nodes[2] )
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# Retrieve group contents
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groupStr = ""
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for group in tetra.GetGroups():
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ids = group.GetIDs()
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name = group.GetName()
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eType = group.GetType()
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groupStr += "'%s' %s: %s \n" % ( name, eType, ids )
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