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https://git.salome-platform.org/gitpub/modules/smesh.git
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247 lines
6.4 KiB
Python
247 lines
6.4 KiB
Python
# -*- coding: iso-8859-1 -*-
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# Copyright (C) 2007-2022 CEA/DEN, EDF R&D, OPEN CASCADE
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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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# =======================================
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# Procedure that take a triangulation and split all triangles in 4 others triangles
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#
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import os
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import shutil
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import tempfile
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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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# Values
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# ------
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tmpDir = tempfile.mkdtemp()
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print("Output directory:", tmpDir)
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# Path for ".med" files
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path = os.path.join(tmpDir, "ex29_")
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# Name of the shape and the mesh
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name = "Carre"
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# Add a node and needed edges
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# ---------------------------
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def node(m, f, n1, n2, lnv):
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x1, y1, z1 = m.GetNodeXYZ(n1)
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x2, y2, z2 = m.GetNodeXYZ(n2)
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x = (x1 + x2) / 2.0
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y = (y1 + y2) / 2.0
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z = (z1 + z2) / 2.0
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i = m.AddNode(x, y, z)
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in1 = m.GetShapeID(n1)
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in2 = m.GetShapeID(n2)
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if (in1==f) or (in2==f):
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m.SetNodeOnFace(i, f, 0, 0)
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else:
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e1 = m.AddEdge([ n1, i ])
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e2 = m.AddEdge([ i , n2 ])
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if n1 in lnv:
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e = in2
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else:
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e = in1
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m.SetMeshElementOnShape(e1, e)
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m.SetMeshElementOnShape(e2, e)
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m.SetNodeOnEdge(i, e, 0)
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return i
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# Add a triangle and associate to the CAD face
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# --------------------------------------------
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def triangle(m, f, n1, n2, n3):
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i = m.AddFace([ n1, n2, n3 ])
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m.SetMeshElementOnShape(i, f)
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# Split all triangles in 4 triangles
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# ----------------------------------
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def SplitTrianglesIn4(m):
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# Get all triangles
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triangles = m.GetElementsByType(SMESH.FACE)
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# Remove all edges
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m.RemoveElements(m.GetElementsByType(SMESH.EDGE))
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# Get the list of nodes (ids) associated with the CAD vertices
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shape = m.GetShape()
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lnv = []
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for v in geompy.SubShapeAll(shape, geompy.ShapeType["VERTEX"]):
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lnv = lnv + m.GetSubMeshNodesId(v, True)
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# Split every triangle
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for t in triangles:
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noeud_1, noeud_2, noeud_3 = m.GetElemNodes(t)
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face = m.GetShapeIDForElem(t)
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noeud_12 = node(m, face, noeud_1, noeud_2, lnv)
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noeud_23 = node(m, face, noeud_2, noeud_3, lnv)
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noeud_13 = node(m, face, noeud_1, noeud_3, lnv)
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triangle(m, face, noeud_1 , noeud_12, noeud_13)
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triangle(m, face, noeud_2 , noeud_23, noeud_12)
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triangle(m, face, noeud_3 , noeud_13, noeud_23)
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triangle(m, face, noeud_12, noeud_23, noeud_13)
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# Remove all initial triangles
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m.RemoveElements(triangles)
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# Merge all identical nodes
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m.MergeNodes(m.FindCoincidentNodes(0.0001))
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# Build a CAD square
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# ------------------
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x0 = 0.0 ; y0 = 0.0 ; z0 = 0.0
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x1 = 1.0 ; y1 = 0.0 ; z1 = 0.0
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x2 = 1.0 ; y2 = 1.0 ; z2 = 0.0
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x3 = 0.0 ; y3 = 1.0 ; z3 = 0.0
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P0 = geompy.MakeVertex(x0, y0, z0)
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P1 = geompy.MakeVertex(x1, y1, z1)
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P2 = geompy.MakeVertex(x2, y2, z2)
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P3 = geompy.MakeVertex(x3, y3, z3)
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square = geompy.MakeQuad4Vertices(P0, P1, P2, P3)
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geompy.addToStudy(square, name)
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# Refine edges and create group of mesh
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# -------------------------------------
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def refine(m, p1, p2, n, k, name):
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s = m.GetShape()
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g = geompy.CreateGroup(s, geompy.ShapeType["EDGE"])
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e = geompy.GetEdge(s, p1, p2)
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i = geompy.GetSubShapeID(s, e)
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geompy.AddObject(g, i)
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m.Group(g, name)
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a = m.Segment(e)
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a.NumberOfSegments(n, k)
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# Mesh the square
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# ---------------
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MyMesh = smesh.Mesh(square)
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refine(MyMesh, P1, P2, 8, 7, "Droite")
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refine(MyMesh, P3, P0, 9, 10, "Gauche")
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refine(MyMesh, P0, P1, 7, 9, "Bas" )
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refine(MyMesh, P2, P3, 12, 14, "Haut" )
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algo2D = MyMesh.Triangle()
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algo2D.MaxElementArea(0.07)
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isDone = MyMesh.Compute()
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if not isDone:
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raise Exception("Error when computing Mesh")
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MyMesh.ExportMED(path+"110_triangles.med", 0)
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# Disturb the mesh
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# ----------------
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MyMesh.MoveNode( 37, 0.05 , 0.368967 , 0 )
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MyMesh.MoveNode( 38, 0.34 , 0.0762294, 0 )
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MyMesh.MoveNode( 40, 0.8 , 0.42 , 0 )
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MyMesh.MoveNode( 42, 0.702662, 0.74 , 0 )
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MyMesh.MoveNode( 46, 0.4 , 0.374656 , 0 )
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MyMesh.MoveNode( 47, 0.13 , 0.63 , 0 )
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MyMesh.MoveNode( 49, 0.222187, 0.3 , 0 )
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MyMesh.MoveNode( 54, 0.557791, 0.05 , 0 )
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MyMesh.MoveNode( 55, 0.7 , 0.2 , 0 )
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MyMesh.MoveNode( 56, 0.73 , 0.52 , 0 )
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MyMesh.MoveNode( 58, 0.313071, 0.31 , 0 )
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MyMesh.MoveNode( 59, 0.8 , 0.56 , 0 )
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MyMesh.MoveNode( 62, 0.592703, 0.95 , 0 )
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MyMesh.MoveNode( 63, 0.28 , 0.5 , 0 )
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MyMesh.MoveNode( 65, 0.49 , 0.93 , 0 )
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MyMesh.MoveNode( 68, 0.501038, 0.65 , 0 )
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MyMesh.MoveNode( 69, 0.37 , 0.63 , 0 )
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MyMesh.MoveNode( 70, 0.597025, 0.52 , 0 )
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MyMesh.MoveNode( 72, 0.899 , 0.878589 , 0 )
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MyMesh.MoveNode( 73, 0.92 , 0.85 , 0 )
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MyMesh.MoveNode( 74, 0.820851, 0.75 , 0 )
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NbCells1 = 110
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MyMesh.ExportMED(path+"110_triangles_2.med", 0)
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# First mesh refining
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# -------------------
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SplitTrianglesIn4(MyMesh)
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NbCells2 = NbCells1*4
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print(("Mesh with "+str(NbCells2)+" cells computed."))
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MyMesh.ExportMED(path+str(NbCells2)+"_triangles.med", 0)
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# Second mesh refining
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# --------------------
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SplitTrianglesIn4(MyMesh)
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NbCells3 = NbCells2*4
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print(("Mesh with "+str(NbCells3)+" cells computed."))
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MyMesh.ExportMED(path+str(NbCells3)+"_triangles.med",0)
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# Third mesh refining
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# -------------------
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SplitTrianglesIn4(MyMesh)
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NbCells4 = NbCells3*4
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print(("Mesh with "+str(NbCells4)+" cells computed."))
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MyMesh.ExportMED(path+str(NbCells4)+"_triangles.med", 0)
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# Remove temporary directory
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# --------------------------
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if os.getenv('SMESH_KEEP_TMP_DIR') != '1':
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shutil.rmtree(tmpDir)
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# Update the object browser
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# -------------------------
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salome.sg.updateObjBrowser()
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