smesh/test/SMESH_mechanic_netgen.py

#  -*- coding: iso-8859-1 -*-
# Copyright (C) 2007-2024  CEA, EDF, OPEN CASCADE
#
# Copyright (C) 2003-2007  OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
# CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
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# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
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# See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
#

# Quadrangulation of the geometry generated by the Python script
# SMESH_mechanic.py
# The new Netgen algorithm is used that discretizes baoundaries itself
#
import salome
salome.salome_init()
import GEOM
from salome.geom import geomBuilder
geompy = geomBuilder.New()

import SMESH, SALOMEDS
from salome.smesh import smeshBuilder
smesh =  smeshBuilder.New()

# ---------------------------- GEOM --------------------------------------

# ---- define contiguous arcs and segment to define a closed wire
p1   = geompy.MakeVertex( 100.0,   0.0,  0.0 )
p2   = geompy.MakeVertex(  50.0,  50.0,  0.0 )
p3   = geompy.MakeVertex( 100.0, 100.0,  0.0 )
arc1 = geompy.MakeArc( p1, p2, p3 )

p4   = geompy.MakeVertex( 170.0, 100.0, 0.0 )
seg1 = geompy.MakeVector( p3, p4 )

p5   = geompy.MakeVertex( 200.0, 70.0, 0.0 )
p6   = geompy.MakeVertex( 170.0, 40.0, 0.0 )
arc2 = geompy.MakeArc( p4, p5, p6 )

p7   = geompy.MakeVertex( 120.0, 30.0, 0.0 )
arc3 = geompy.MakeArc( p6, p7, p1 )

# ---- define a closed wire with arcs and segment
List1 = []
List1.append( arc1 )
List1.append( seg1 )
List1.append( arc2 )
List1.append( arc3 )

wire1 = geompy.MakeWire( List1 )
Id_wire1 = geompy.addToStudy( wire1, "wire1" )

# ---- define a planar face with wire
WantPlanarFace = 1 #True
face1 = geompy.MakeFace( wire1, WantPlanarFace )
Id_face1 = geompy.addToStudy( face1, "face1" )

# ---- create a shape by extrusion
pO = geompy.MakeVertex( 0.0, 0.0,   0.0 )
pz = geompy.MakeVertex( 0.0, 0.0, 100.0 )
vz = geompy.MakeVector( pO, pz )

prism1 = geompy.MakePrismVecH( face1, vz, 100.0 )
Id_prism1 = geompy.addToStudy( prism1, "prism1")

# ---- create two cylinders

pc1 = geompy.MakeVertex(  90.0, 50.0, -40.0 )
pc2 = geompy.MakeVertex( 170.0, 70.0, -40.0 )
radius = 20.0
height = 180.0
cyl1  = geompy.MakeCylinder( pc1, vz, radius, height )
cyl2  = geompy.MakeCylinder( pc2, vz, radius, height )

Id_Cyl1 = geompy.addToStudy( cyl1, "cyl1" )
Id_Cyl2 = geompy.addToStudy( cyl2, "cyl2" )

# ---- cut with cyl1
shape  = geompy.MakeBoolean( prism1, cyl1, 2 )

# ---- fuse with cyl2 to obtain the final mechanic piece :)
mechanic =  geompy.MakeBoolean( shape, cyl2, 3 )
Id_mechanic = geompy.addToStudy( mechanic, "mechanic" )

# ---- Analysis of the geometry

print("Analysis of the geometry mechanic :")

subShellList = geompy.SubShapeAll(mechanic,geompy.ShapeType["SHELL"])
subFaceList  = geompy.SubShapeAll(mechanic,geompy.ShapeType["FACE"])
subEdgeList  = geompy.SubShapeAll(mechanic,geompy.ShapeType["EDGE"])

print("number of Shells in mechanic : ",len(subShellList))
print("number of Faces in mechanic : ",len(subFaceList))
print("number of Edges in mechanic : ",len(subEdgeList))

### ---------------------------- SMESH --------------------------------------

print("-------------------------- create Mesh, algorithm, hypothesis")

mesh = smesh.Mesh(mechanic, "Mesh_mechanic");
netgen = mesh.Triangle(smeshBuilder.NETGEN)
netgen.SetMaxSize( 50 )
#netgen.SetSecondOrder( 0 )
netgen.SetFineness( smeshBuilder.Fine )
netgen.SetQuadAllowed( 1 )
#netgen.SetOptimize( 1 )

print("-------------------------- compute mesh")
ret = mesh.Compute()
print(ret)
if not ret:
    raise Exception("Error when computing Mesh")

print("Information about the MeshcompShel:")
print("Number of nodes        : ", mesh.NbNodes())
print("Number of edges        : ", mesh.NbEdges())
print("Number of faces        : ", mesh.NbFaces())
print("Number of triangles    : ", mesh.NbTriangles())
print("Number of quadrangles  : ", mesh.NbQuadrangles())
print("Number of volumes      : ", mesh.NbVolumes())
print("Number of tetrahedrons : ", mesh.NbTetras())

salome.sg.updateObjBrowser()