mirror of
https://git.salome-platform.org/gitpub/modules/smesh.git
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221 lines
6.1 KiB
Python
221 lines
6.1 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright (C) 2007-2022 CEA/DEN, EDF R&D, OPEN CASCADE
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#
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# Copyright (C) 2003-2007 OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
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# CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#
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# See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
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#
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import salome
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salome.salome_init()
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import GEOM
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from salome.geom import geomBuilder
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geompy = geomBuilder.New()
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import SMESH, SALOMEDS
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from salome.smesh import smeshBuilder
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smesh = smeshBuilder.New()
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import math
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def GetNewNodes(mesh,Elems,OldNodes):
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"""
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Auxiliary function, which return list of nodes from
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given Elems avoided nodes from OldNodes
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"""
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newnodes = []
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for i in Elems:
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nbn = mesh.GetElemNbNodes(i)
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for j in range(0,nbn):
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nn = mesh.GetElemNode(i,j)
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isold = 0
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for k in range(0,len(newnodes)):
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if nn==newnodes[k]:
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isold = 1
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break
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pass
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if isold: continue
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for k in range(0,len(OldNodes)):
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if nn==OldNodes[k]:
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isold = 1
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break
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pass
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if isold: continue
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newnodes.append(nn)
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pass
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pass
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return newnodes
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# create empty mesh
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mesh = smesh.Mesh()
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tol = 0.001
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# create a cross from quadrangle faces
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# 1. create first edge and make extrusion along 0x
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n1 = mesh.AddNode(55,-5,0)
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n2 = mesh.AddNode(55,5,0)
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e1 = mesh.AddEdge([n1,n2])
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dir1 = SMESH.DirStruct(SMESH.PointStruct(-10,0,0))
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mesh.ExtrusionSweep([e1],dir1,11)
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# 2. create second edge and make extrusion along 0y
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n3 = mesh.AddNode(-5,-55,0)
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n4 = mesh.AddNode(5,-55,0)
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e2 = mesh.AddEdge([n3,n4])
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dir2 = SMESH.DirStruct(SMESH.PointStruct(0,10,0))
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mesh.ExtrusionSweep([e2],dir2,11)
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# since result has coincident nodes and faces
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# we have to make merge
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nodes = mesh.FindCoincidentNodes(0.001)
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mesh.MergeNodes(nodes)
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mesh.MergeEqualElements()
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# make extrusion faces along 0z
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faces = mesh.GetElementsByType(SMESH.FACE)
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nbf = len(faces)
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maxang = 2.0
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zstep = 5
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nbzsteps = 50
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dir3 = SMESH.DirStruct(SMESH.PointStruct(0,0,zstep))
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newfaces = [] # list for keeping created top faces
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# during extrusion
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for i in range(0,nbzsteps):
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mesh.ExtrusionSweep(faces,dir3,1)
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# find top faces after each extrusion and keep them
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res = mesh.GetLastCreatedElems()
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nbr = len(res)
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nfaces = []
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for j in res:
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nbn = mesh.GetElemNbNodes(j)
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if nbn!=4: continue
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nn1 = mesh.GetElemNode(j,0)
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xyz1 = mesh.GetNodeXYZ(nn1)
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nn2 = mesh.GetElemNode(j,1)
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xyz2 = mesh.GetNodeXYZ(nn2)
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nn3 = mesh.GetElemNode(j,2)
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xyz3 = mesh.GetNodeXYZ(nn3)
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if abs(xyz1[2]-xyz2[2])<tol and abs(xyz1[2]-xyz3[2])<tol :
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# this face is a top face
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nfaces.append(j)
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pass
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pass
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if len(nfaces)!=nbf:
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print("len(nfaces)!=nbf")
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break
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newfaces.append(nfaces)
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# update faces for before next step of extrusion
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faces = nfaces
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pass
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# rotate faces from newfaces
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axisr1 = SMESH.AxisStruct(0,0,0,0,0,1)
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for i in range(0,nbzsteps):
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ang = maxang*(1-math.cos((i+1)*math.pi/nbzsteps))
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mesh.Rotate(newfaces[i],axisr1,ang,0)
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# create circles
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# create two edges and rotate them for creation
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# full circle
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n5 = mesh.AddNode(65,0,0)
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n6 = mesh.AddNode(67.5,0,0)
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n7 = mesh.AddNode(70,0,0)
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e56 = mesh.AddEdge([n5,n6])
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e67 = mesh.AddEdge([n6,n7])
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axisr2 = SMESH.AxisStruct(65,0,0,0,1,0)
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mesh.RotationSweep([e56,e67],axisr2, math.pi/6, 12, tol)
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res = mesh.GetLastCreatedElems()
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faces1 = []
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for i in res:
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nbn = mesh.GetElemNbNodes(i)
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if nbn>2: faces1.append(i)
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pass
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nbf1 = len(faces1)
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# create other two edges and rotate them for creation
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# other full circle
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n8 = mesh.AddNode(-65,0,0)
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n9 = mesh.AddNode(-67.5,0,0)
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n10 = mesh.AddNode(-70,0,0)
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e8 = mesh.AddEdge([n8,n9])
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e9 = mesh.AddEdge([n9,n10])
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axisr3 = SMESH.AxisStruct(-65,0,0,0,-1,0)
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mesh.RotationSweep([e8,e9],axisr3, math.pi/6, 12, tol)
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res = mesh.GetLastCreatedElems()
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faces2 = []
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for i in res:
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nbn = mesh.GetElemNbNodes(i)
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if nbn>2: faces2.append(i)
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pass
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nbf2 = len(faces2)
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# there are coincident nodes after rotation
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# therefore we have to merge nodes
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nodes = mesh.FindCoincidentNodes(0.001)
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mesh.MergeNodes(nodes)
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nbcircs = 2
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nbrsteps = 24
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nbrs = nbcircs*nbrsteps
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dz = nbzsteps*zstep/nbrs
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# create first spiral
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oldnodes = []
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newnodes = GetNewNodes(mesh,faces1,oldnodes)
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oldnodes = newnodes
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nodes = []
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mesh.RotationSweep(faces1,axisr1, math.pi*2/nbrsteps, nbrs, tol)
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res = mesh.GetLastCreatedElems()
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for i in range(0,nbrs):
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volumes = []
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for j in range(0,nbf1): volumes.append(res[i+j*nbrs])
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newnodes = GetNewNodes(mesh,volumes,oldnodes)
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for j in newnodes:
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xyz = mesh.GetNodeXYZ(j)
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mesh.MoveNode(j,xyz[0],xyz[1],xyz[2]+dz*(i+1))
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pass
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oldnodes = newnodes
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pass
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# create second spiral
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oldnodes = []
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newnodes = GetNewNodes(mesh,faces2,oldnodes)
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oldnodes = newnodes
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nodes = []
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mesh.RotationSweep(faces2,axisr1, math.pi*2/nbrsteps, nbrs, tol)
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res = mesh.GetLastCreatedElems()
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for i in range(0,nbrs):
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volumes = []
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for j in range(0,nbf2): volumes.append(res[i+j*nbrs])
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newnodes = GetNewNodes(mesh,volumes,oldnodes)
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for j in newnodes:
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xyz = mesh.GetNodeXYZ(j)
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mesh.MoveNode(j,xyz[0],xyz[1],xyz[2]+dz*(i+1))
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pass
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oldnodes = newnodes
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pass
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salome.sg.updateObjBrowser()
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