1 # Copyright (C) 2007-2008 CEA/DEN, EDF R&D, OPEN CASCADE
3 # Copyright (C) 2003-2007 OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
4 # CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS
6 # This library is free software; you can redistribute it and/or
7 # modify it under the terms of the GNU Lesser General Public
8 # License as published by the Free Software Foundation; either
9 # version 2.1 of the License.
11 # This library is distributed in the hope that it will be useful,
12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 # Lesser General Public License for more details.
16 # You should have received a copy of the GNU Lesser General Public
17 # License along with this library; if not, write to the Free Software
18 # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 # See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
22 # =======================================
23 # Procedure that take a triangulation and split all triangles in 4 others triangles
33 # Path for ".med" files
34 path = "/tmp/ex29_%s_" % os.getenv('USER','unknown')
36 # Name of the shape and the mesh
39 # Add a node and needed edges
40 # ---------------------------
42 def node(m, f, n1, n2, lnv):
43 x1, y1, z1 = m.GetNodeXYZ(n1)
44 x2, y2, z2 = m.GetNodeXYZ(n2)
50 i = m.AddNode(x, y, z)
52 in1 = m.GetShapeID(n1)
53 in2 = m.GetShapeID(n2)
55 if (in1==f) or (in2==f):
56 m.SetNodeOnFace(i, f, 0, 0)
59 e1 = m.AddEdge([ n1, i ])
60 e2 = m.AddEdge([ i , n2 ])
67 m.SetMeshElementOnShape(e1, e)
68 m.SetMeshElementOnShape(e2, e)
69 m.SetNodeOnEdge(i, e, 0)
73 # Add a triangle and associate to the CAD face
74 # --------------------------------------------
76 def triangle(m, f, n1, n2, n3):
77 i = m.AddFace([ n1, n2, n3 ])
78 m.SetMeshElementOnShape(i, f)
80 # Split all triangles in 4 triangles
81 # ----------------------------------
83 def SplitTrianglesIn4(m):
85 triangles = m.GetElementsByType(smesh.FACE)
88 m.RemoveElements(m.GetElementsByType(smesh.EDGE))
90 # Get the list of nodes (ids) associated with the CAD vertices
93 for v in geompy.SubShapeAll(shape, geompy.ShapeType["VERTEX"]):
94 lnv = lnv + m.GetSubMeshNodesId(v, True)
96 # Split every triangle
98 noeud_1, noeud_2, noeud_3 = m.GetElemNodes(t)
100 face = m.GetShapeIDForElem(t)
102 noeud_12 = node(m, face, noeud_1, noeud_2, lnv)
103 noeud_23 = node(m, face, noeud_2, noeud_3, lnv)
104 noeud_13 = node(m, face, noeud_1, noeud_3, lnv)
106 triangle(m, face, noeud_1 , noeud_12, noeud_13)
107 triangle(m, face, noeud_2 , noeud_23, noeud_12)
108 triangle(m, face, noeud_3 , noeud_13, noeud_23)
109 triangle(m, face, noeud_12, noeud_23, noeud_13)
111 # Remove all initial triangles
112 m.RemoveElements(triangles)
114 # Merge all identical nodes
115 m.MergeNodes(m.FindCoincidentNodes(0.0001))
120 x0 = 0.0 ; y0 = 0.0 ; z0 = 0.0
121 x1 = 1.0 ; y1 = 0.0 ; z1 = 0.0
122 x2 = 1.0 ; y2 = 1.0 ; z2 = 0.0
123 x3 = 0.0 ; y3 = 1.0 ; z3 = 0.0
125 P0 = geompy.MakeVertex(x0, y0, z0)
126 P1 = geompy.MakeVertex(x1, y1, z1)
127 P2 = geompy.MakeVertex(x2, y2, z2)
128 P3 = geompy.MakeVertex(x3, y3, z3)
130 square = geompy.MakeQuad4Vertices(P0, P1, P2, P3)
131 geompy.addToStudy(square, name)
133 # Refine edges and create group of mesh
134 # -------------------------------------
136 def refine(m, p1, p2, n, k, name):
139 g = geompy.CreateGroup(s, geompy.ShapeType["EDGE"])
140 e = geompy.GetEdge(s, p1, p2)
141 i = geompy.GetSubShapeID(s, e)
142 geompy.AddObject(g, i)
146 a.NumberOfSegments(n, k)
151 MyMesh = smesh.Mesh(square)
153 refine(MyMesh, P1, P2, 8, 7, "Droite")
154 refine(MyMesh, P3, P0, 9, 10, "Gauche")
155 refine(MyMesh, P0, P1, 7, 9, "Bas" )
156 refine(MyMesh, P2, P3, 12, 14, "Haut" )
158 algo2D = MyMesh.Triangle()
159 algo2D.MaxElementArea(0.07)
163 MyMesh.ExportMED(path+"110_triangles.med", 0)
168 MyMesh.MoveNode( 37, 0.05 , 0.368967 , 0 )
169 MyMesh.MoveNode( 38, 0.34 , 0.0762294, 0 )
170 MyMesh.MoveNode( 40, 0.8 , 0.42 , 0 )
171 MyMesh.MoveNode( 42, 0.702662, 0.74 , 0 )
172 MyMesh.MoveNode( 46, 0.4 , 0.374656 , 0 )
173 MyMesh.MoveNode( 47, 0.13 , 0.63 , 0 )
174 MyMesh.MoveNode( 49, 0.222187, 0.3 , 0 )
175 MyMesh.MoveNode( 54, 0.557791, 0.05 , 0 )
176 MyMesh.MoveNode( 55, 0.7 , 0.2 , 0 )
177 MyMesh.MoveNode( 56, 0.73 , 0.52 , 0 )
178 MyMesh.MoveNode( 58, 0.313071, 0.31 , 0 )
179 MyMesh.MoveNode( 59, 0.8 , 0.56 , 0 )
180 MyMesh.MoveNode( 62, 0.592703, 0.95 , 0 )
181 MyMesh.MoveNode( 63, 0.28 , 0.5 , 0 )
182 MyMesh.MoveNode( 65, 0.49 , 0.93 , 0 )
183 MyMesh.MoveNode( 68, 0.501038, 0.65 , 0 )
184 MyMesh.MoveNode( 69, 0.37 , 0.63 , 0 )
185 MyMesh.MoveNode( 70, 0.597025, 0.52 , 0 )
186 MyMesh.MoveNode( 72, 0.899 , 0.878589 , 0 )
187 MyMesh.MoveNode( 73, 0.92 , 0.85 , 0 )
188 MyMesh.MoveNode( 74, 0.820851, 0.75 , 0 )
191 MyMesh.ExportMED(path+"110_triangles_2.med", 0)
193 # First mesh refining
194 # -------------------
196 SplitTrianglesIn4(MyMesh)
198 NbCells2 = NbCells1*4
199 print("Mesh with "+str(NbCells2)+" cells computed.")
201 MyMesh.ExportMED(path+str(NbCells2)+"_triangles.med", 0)
203 # Second mesh refining
204 # --------------------
206 SplitTrianglesIn4(MyMesh)
208 NbCells3 = NbCells2*4
209 print("Mesh with "+str(NbCells3)+" cells computed.")
211 MyMesh.ExportMED(path+str(NbCells3)+"_triangles.med",0)
213 # Third mesh refining
214 # -------------------
216 SplitTrianglesIn4(MyMesh)
218 NbCells4 = NbCells3*4
219 print("Mesh with "+str(NbCells4)+" cells computed.")
221 MyMesh.ExportMED(path+str(NbCells4)+"_triangles.med", 0)
223 # Update the object browser
224 # -------------------------
226 geompy.salome.sg.updateObjBrowser(1)