# -*- coding: utf-8 -*-
# Copyright (C) 2007-2022 CEA/DEN, EDF R&D, 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.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
#
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()
import math
def GetNewNodes(mesh,Elems,OldNodes):
"""
Auxiliary function, which return list of nodes from
given Elems avoided nodes from OldNodes
"""
newnodes = []
for i in Elems:
nbn = mesh.GetElemNbNodes(i)
for j in range(0,nbn):
nn = mesh.GetElemNode(i,j)
isold = 0
for k in range(0,len(newnodes)):
if nn==newnodes[k]:
isold = 1
break
pass
if isold: continue
for k in range(0,len(OldNodes)):
if nn==OldNodes[k]:
isold = 1
break
pass
if isold: continue
newnodes.append(nn)
pass
pass
return newnodes
# create empty mesh
mesh = smesh.Mesh()
tol = 0.001
# create a cross from quadrangle faces
# 1. create first edge and make extrusion along 0x
n1 = mesh.AddNode(55,-5,0)
n2 = mesh.AddNode(55,5,0)
e1 = mesh.AddEdge([n1,n2])
dir1 = SMESH.DirStruct(SMESH.PointStruct(-10,0,0))
mesh.ExtrusionSweep([e1],dir1,11)
# 2. create second edge and make extrusion along 0y
n3 = mesh.AddNode(-5,-55,0)
n4 = mesh.AddNode(5,-55,0)
e2 = mesh.AddEdge([n3,n4])
dir2 = SMESH.DirStruct(SMESH.PointStruct(0,10,0))
mesh.ExtrusionSweep([e2],dir2,11)
# since result has coincident nodes and faces
# we have to make merge
nodes = mesh.FindCoincidentNodes(0.001)
mesh.MergeNodes(nodes)
mesh.MergeEqualElements()
# make extrusion faces along 0z
faces = mesh.GetElementsByType(SMESH.FACE)
nbf = len(faces)
maxang = 2.0
zstep = 5
nbzsteps = 50
dir3 = SMESH.DirStruct(SMESH.PointStruct(0,0,zstep))
newfaces = [] # list for keeping created top faces
# during extrusion
for i in range(0,nbzsteps):
mesh.ExtrusionSweep(faces,dir3,1)
# find top faces after each extrusion and keep them
res = mesh.GetLastCreatedElems()
nbr = len(res)
nfaces = []
for j in res:
nbn = mesh.GetElemNbNodes(j)
if nbn!=4: continue
nn1 = mesh.GetElemNode(j,0)
xyz1 = mesh.GetNodeXYZ(nn1)
nn2 = mesh.GetElemNode(j,1)
xyz2 = mesh.GetNodeXYZ(nn2)
nn3 = mesh.GetElemNode(j,2)
xyz3 = mesh.GetNodeXYZ(nn3)
if abs(xyz1[2]-xyz2[2])<tol and abs(xyz1[2]-xyz3[2])<tol :
# this face is a top face
nfaces.append(j)
pass
pass
if len(nfaces)!=nbf:
print("len(nfaces)!=nbf")
break
newfaces.append(nfaces)
# update faces for before next step of extrusion
faces = nfaces
pass
# rotate faces from newfaces
axisr1 = SMESH.AxisStruct(0,0,0,0,0,1)
for i in range(0,nbzsteps):
ang = maxang*(1-math.cos((i+1)*math.pi/nbzsteps))
mesh.Rotate(newfaces[i],axisr1,ang,0)
# create circles
# create two edges and rotate them for creation
# full circle
n5 = mesh.AddNode(65,0,0)
n6 = mesh.AddNode(67.5,0,0)
n7 = mesh.AddNode(70,0,0)
e56 = mesh.AddEdge([n5,n6])
e67 = mesh.AddEdge([n6,n7])
axisr2 = SMESH.AxisStruct(65,0,0,0,1,0)
mesh.RotationSweep([e56,e67],axisr2, math.pi/6, 12, tol)
res = mesh.GetLastCreatedElems()
faces1 = []
for i in res:
nbn = mesh.GetElemNbNodes(i)
if nbn>2: faces1.append(i)
pass
nbf1 = len(faces1)
# create other two edges and rotate them for creation
# other full circle
n8 = mesh.AddNode(-65,0,0)
n9 = mesh.AddNode(-67.5,0,0)
n10 = mesh.AddNode(-70,0,0)
e8 = mesh.AddEdge([n8,n9])
e9 = mesh.AddEdge([n9,n10])
axisr3 = SMESH.AxisStruct(-65,0,0,0,-1,0)
mesh.RotationSweep([e8,e9],axisr3, math.pi/6, 12, tol)
res = mesh.GetLastCreatedElems()
faces2 = []
for i in res:
nbn = mesh.GetElemNbNodes(i)
if nbn>2: faces2.append(i)
pass
nbf2 = len(faces2)
# there are coincident nodes after rotation
# therefore we have to merge nodes
nodes = mesh.FindCoincidentNodes(0.001)
mesh.MergeNodes(nodes)
nbcircs = 2
nbrsteps = 24
nbrs = nbcircs*nbrsteps
dz = nbzsteps*zstep/nbrs
# create first spiral
oldnodes = []
newnodes = GetNewNodes(mesh,faces1,oldnodes)
oldnodes = newnodes
nodes = []
mesh.RotationSweep(faces1,axisr1, math.pi*2/nbrsteps, nbrs, tol)
res = mesh.GetLastCreatedElems()
for i in range(0,nbrs):
volumes = []
for j in range(0,nbf1): volumes.append(res[i+j*nbrs])
newnodes = GetNewNodes(mesh,volumes,oldnodes)
for j in newnodes:
xyz = mesh.GetNodeXYZ(j)
mesh.MoveNode(j,xyz[0],xyz[1],xyz[2]+dz*(i+1))
pass
oldnodes = newnodes
pass
# create second spiral
oldnodes = []
newnodes = GetNewNodes(mesh,faces2,oldnodes)
oldnodes = newnodes
nodes = []
mesh.RotationSweep(faces2,axisr1, math.pi*2/nbrsteps, nbrs, tol)
res = mesh.GetLastCreatedElems()
for i in range(0,nbrs):
volumes = []
for j in range(0,nbf2): volumes.append(res[i+j*nbrs])
newnodes = GetNewNodes(mesh,volumes,oldnodes)
for j in newnodes:
xyz = mesh.GetNodeXYZ(j)
mesh.MoveNode(j,xyz[0],xyz[1],xyz[2]+dz*(i+1))
pass
oldnodes = newnodes
pass
salome.sg.updateObjBrowser()