smesh/doc/salome/examples/3dmesh.py
2016-06-14 12:42:49 +03:00

105 lines
2.4 KiB
Python

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