mirror of
https://git.salome-platform.org/gitpub/modules/smesh.git
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589 lines
15 KiB
Plaintext
589 lines
15 KiB
Plaintext
/*!
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\page tui_defining_hypotheses_page Defining Hypotheses and Algorithms
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<h2>Defining 1D Hypotheses</h2>
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<br>
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\anchor tui_1d_arithmetic
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<h3>1D Arithmetic</h3>
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\code
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import geompy
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import smesh
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# create a box
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box = geompy.MakeBoxDXDYDZ(10., 10., 10.)
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geompy.addToStudy(box, "Box")
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# create a hexahedral mesh on the box
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hexa = smesh.Mesh(box, "Box : hexahedrical mesh")
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# create a Regular 1D algorithm for edges
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algo1D = hexa.Segment()
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# optionally reverse node distribution on certain edges
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allEdges = geompy.SubShapeAllSortedIDs( box, geompy.ShapeType["EDGE"])
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reversedEdges = [ allEdges[0], allEdges[4] ]
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# define "Arithmetic1D" hypothesis to cut all edges in several segments with increasing arithmetic length
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algo1D.Arithmetic1D(1, 4, reversedEdges)
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# create a quadrangle 2D algorithm for faces
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hexa.Quadrangle()
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# create a hexahedron 3D algorithm for solids
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hexa.Hexahedron()
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# compute the mesh
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hexa.Compute()
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\endcode
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<br>
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\anchor tui_deflection_1d
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<h3>Deflection 1D and Number of Segments</h3>
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\code
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import geompy
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import smesh
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# create a face from arc and straight segment
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px = geompy.MakeVertex(100., 0. , 0. )
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py = geompy.MakeVertex(0. , 100., 0. )
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pz = geompy.MakeVertex(0. , 0. , 100.)
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exy = geompy.MakeEdge(px, py)
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arc = geompy.MakeArc(py, pz, px)
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wire = geompy.MakeWire([exy, arc])
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isPlanarFace = 1
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face1 = geompy.MakeFace(wire, isPlanarFace)
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geompy.addToStudy(face1,"Face1")
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# get edges from the face
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e_straight,e_arc = geompy.SubShapeAll(face1, geompy.ShapeType["EDGE"])
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geompy.addToStudyInFather(face1, e_arc, "Arc Edge")
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# create hexahedral mesh
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hexa = smesh.Mesh(face1, "Face : triangle mesh")
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# define "NumberOfSegments" hypothesis to cut a straight edge in a fixed number of segments
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algo1D = hexa.Segment()
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algo1D.NumberOfSegments(6)
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# define "MaxElementArea" hypothesis
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algo2D = hexa.Triangle()
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algo2D.MaxElementArea(70.0)
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# define a local "Deflection1D" hypothesis on the arc
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algo_local = hexa.Segment(e_arc)
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algo_local.Deflection1D(1.0)
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# compute the mesh
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hexa.Compute()
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\endcode
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<br>
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\anchor tui_start_and_end_length
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<h3>Start and End Length</h3>
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\code
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from geompy import *
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import smesh
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# create a box
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box = MakeBoxDXDYDZ(10., 10., 10.)
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addToStudy(box, "Box")
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# get one edge of the box to put local hypothesis on
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p5 = MakeVertex(5., 0., 0.)
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EdgeX = GetEdgeNearPoint(box, p5)
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addToStudyInFather(box, EdgeX, "Edge [0,0,0 - 10,0,0]")
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# create a hexahedral mesh on the box
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hexa = smesh.Mesh(box, "Box : hexahedrical mesh")
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# set algorithms
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algo1D = hexa.Segment()
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hexa.Quadrangle()
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hexa.Hexahedron()
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# define "NumberOfSegments" hypothesis to cut an edge in a fixed number of segments
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algo1D.NumberOfSegments(4)
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# create a local hypothesis
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algo_local = hexa.Segment(EdgeX)
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# define "StartEndLength" hypothesis to cut an edge in several segments with increasing geometric length
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algo_local.StartEndLength(1, 6)
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# define "Propagation" hypothesis that propagates all other hypothesis
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# on all edges on the opposite side in case of quadrangular faces
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algo_local.Propagation()
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# compute the mesh
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hexa.Compute()
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\endcode
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<br>
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\anchor tui_average_length
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<h3>Average Length</h3>
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\code
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from geompy import *
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import smesh
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# create a box
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box = MakeBoxDXDYDZ(10., 10., 10.)
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addToStudy(box, "Box")
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# get one edge of the box to put local hypothesis on
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p5 = MakeVertex(5., 0., 0.)
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EdgeX = GetEdgeNearPoint(box, p5)
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addToStudyInFather(box, EdgeX, "Edge [0,0,0 - 10,0,0]")
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# create a hexahedral mesh on the box
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hexa = smesh.Mesh(box, "Box : hexahedrical mesh")
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# set algorithms
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algo1D = hexa.Segment()
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hexa.Quadrangle()
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hexa.Hexahedron()
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# define "NumberOfSegments" hypothesis to cut all edges in a fixed number of segments
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algo1D.NumberOfSegments(4)
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# create a sub-mesh
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algo_local = hexa.Segment(EdgeX)
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# define "LocalLength" hypothesis to cut an edge in several segments with the same length
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algo_local.LocalLength(2.)
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# define "Propagation" hypothesis that propagates all other hypothesis
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# on all edges on the opposite side in case of quadrangular faces
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algo_local.Propagation()
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# compute the mesh
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hexa.Compute()
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\endcode
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<br><h2>Defining 2D and 3D hypotheses</h2>
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<br>
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\anchor tui_max_element_area
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<h3>Maximum Element Area</h3>
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\code
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import geompy
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import smesh
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import salome
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# create a face
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px = geompy.MakeVertex(100., 0. , 0. )
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py = geompy.MakeVertex(0. , 100., 0. )
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pz = geompy.MakeVertex(0. , 0. , 100.)
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vxy = geompy.MakeVector(px, py)
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arc = geompy.MakeArc(py, pz, px)
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wire = geompy.MakeWire([vxy, arc])
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isPlanarFace = 1
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face = geompy.MakeFace(wire, isPlanarFace)
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# add the face in the study
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id_face = geompy.addToStudy(face, "Face to be meshed")
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# create a mesh
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tria_mesh = smesh.Mesh(face, "Face : triangulation")
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# define 1D meshing:
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algo = tria_mesh.Segment()
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algo.NumberOfSegments(20)
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# define 2D meshing:
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# assign triangulation algorithm
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algo = tria_mesh.Triangle()
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# apply "Max Element Area" hypothesis to each triangle
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algo.MaxElementArea(100)
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# compute the mesh
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tria_mesh.Compute()
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\endcode
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<br>
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\anchor tui_max_element_volume
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<h3>Maximum Element Volume</h3>
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\code
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import geompy
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import smesh
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# create a cylinder
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cyl = geompy.MakeCylinderRH(30., 50.)
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geompy.addToStudy(cyl, "cyl")
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# create a mesh on the cylinder
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tetra = smesh.Mesh(cyl, "Cylinder : tetrahedrical mesh")
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# assign algorithms
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algo1D = tetra.Segment()
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algo2D = tetra.Triangle()
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algo3D = tetra.Tetrahedron(smesh.NETGEN)
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# assign 1D and 2D hypotheses
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algo1D.NumberOfSegments(7)
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algo2D.MaxElementArea(150.)
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# assign Max Element Volume hypothesis
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algo3D.MaxElementVolume(200.)
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# compute the mesh
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ret = tetra.Compute()
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if ret == 0:
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print "probleme when computing the mesh"
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else:
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print "Computation succeded"
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\endcode
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<br>
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\anchor tui_length_from_edges
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<h3>Length from Edges</h3>
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\code
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import geompy
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import smesh
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# create sketchers
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sketcher1 = geompy.MakeSketcher("Sketcher:F 0 0:TT 70 0:TT 70 70:TT 0 70:WW")
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sketcher2 = geompy.MakeSketcher("Sketcher:F 20 20:TT 50 20:TT 50 50:TT 20 50:WW")
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# create a face from two wires
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isPlanarFace = 1
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face1 = geompy.MakeFaces([sketcher1, sketcher2], isPlanarFace)
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geompy.addToStudy(face1, "Face1")
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# create a mesh
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tria = smesh.Mesh(face1, "Face : triangle 2D mesh")
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# Define 1D meshing
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algo1D = tria.Segment()
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algo1D.NumberOfSegments(2)
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# create and assign the algorithm for 2D meshing with triangles
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algo2D = tria.Triangle()
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# create and assign "LengthFromEdges" hypothesis to build triangles based on the length of the edges taken from the wire
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algo2D.LengthFromEdges()
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# compute the mesh
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tria.Compute()
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\endcode
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<br><h2>Defining Additional Hypotheses</h2>
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<br>
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\anchor tui_propagation
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<h3>Propagation</h3>
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\code
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from geompy import *
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import smesh
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# create a box
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box = MakeBoxDXDYDZ(10., 10., 10.)
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addToStudy(box, "Box")
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# get one edge of the box to put local hypothesis on
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p5 = MakeVertex(5., 0., 0.)
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EdgeX = GetEdgeNearPoint(box, p5)
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addToStudyInFather(box, EdgeX, "Edge [0,0,0 - 10,0,0]")
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# create a hexahedral mesh on the box
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hexa = smesh.Mesh(box, "Box : hexahedrical mesh")
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# set global algorithms and hypotheses
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algo1D = hexa.Segment()
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hexa.Quadrangle()
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hexa.Hexahedron()
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algo1D.NumberOfSegments(4)
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# create a sub-mesh with local 1D hypothesis and propagation
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algo_local = hexa.Segment(EdgeX)
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# define "Arithmetic1D" hypothesis to cut an edge in several segments with increasing length
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algo_local.Arithmetic1D(1, 4)
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# define "Propagation" hypothesis that propagates all other 1D hypotheses
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# from all edges on the opposite side of a face in case of quadrangular faces
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algo_local.Propagation()
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# compute the mesh
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hexa.Compute()
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\endcode
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<br>
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\anchor tui_defining_meshing_algos
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<h2>Defining Meshing Algorithms</h2>
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\code
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import geompy
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import smesh
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# create a box
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box = geompy.MakeBoxDXDYDZ(10., 10., 10.)
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geompy.addToStudy(box, "Box")
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# 1. Create a hexahedral mesh on the box
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hexa = smesh.Mesh(box, "Box : hexahedrical mesh")
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# create a Regular 1D algorithm for edges
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algo1D = hexa.Segment()
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# create a quadrangle 2D algorithm for faces
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algo2D = hexa.Quadrangle()
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# create a hexahedron 3D algorithm for solids
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algo3D = hexa.Hexahedron()
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# define hypotheses
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algo1D.Arithmetic1D(1, 4)
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# compute the mesh
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hexa.Compute()
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# 2. Create a tetrahedral mesh on the box
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tetra = smesh.Mesh(box, "Box : tetrahedrical mesh")
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# create a Regular 1D algorithm for edges
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algo1D = tetra.Segment()
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# create a Mefisto 2D algorithm for faces
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algo2D = tetra.Triangle()
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# create a Netgen 3D algorithm for solids
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algo3D = tetra.Tetrahedron(smesh.NETGEN)
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# define hypotheses
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algo1D.Arithmetic1D(1, 4)
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algo2D.LengthFromEdges()
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# compute the mesh
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tetra.Compute()
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# 3. Create a tetrahedral mesh on the box with NETGEN_2D3D algorithm
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tetraN = smesh.Mesh(box, "Box : tetrahedrical mesh by NETGEN_2D3D")
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# create a Netgen_2D3D algorithm for solids
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algo3D = tetraN.Tetrahedron(smesh.FULL_NETGEN)
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# define hypotheses
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n23_params = algo3D.Parameters()
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# compute the mesh
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tetraN.Compute()
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\endcode
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<br>
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\anchor tui_projection
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<h3>Projection Algorithms</h3>
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\code
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# Project prisms from one meshed box to another mesh on the same box
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from smesh import *
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# Prepare geometry
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# Create a parallelepiped
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box = geompy.MakeBoxDXDYDZ(200, 100, 70)
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geompy.addToStudy( box, "box" )
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# Get geom faces to mesh with triangles in the 1ts and 2nd meshes
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faces = geompy.SubShapeAll(box, geompy.ShapeType["FACE"])
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# 2 adjacent faces of the box
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f1 = faces[2]
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f2 = faces[0]
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# face opposite to f2
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f2opp = faces[1]
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# Get vertices used to specify how to associate sides of faces at projection
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[v1F1, v2F1] = geompy.SubShapeAll(f1, geompy.ShapeType["VERTEX"])[:2]
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[v1F2, v2F2] = geompy.SubShapeAll(f2, geompy.ShapeType["VERTEX"])[:2]
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geompy.addToStudyInFather( box, v1F1, "v1F1" )
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geompy.addToStudyInFather( box, v2F1, "v2F1" )
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geompy.addToStudyInFather( box, v1F2, "v1F2" )
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geompy.addToStudyInFather( box, v2F2, "v2F2" )
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# Make group of 3 edges of f1 and f2
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edgesF1 = geompy.CreateGroup(f1, geompy.ShapeType["EDGE"])
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geompy.UnionList( edgesF1, geompy.SubShapeAll(f1, geompy.ShapeType["EDGE"])[:3])
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edgesF2 = geompy.CreateGroup(f2, geompy.ShapeType["EDGE"])
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geompy.UnionList( edgesF2, geompy.SubShapeAll(f2, geompy.ShapeType["EDGE"])[:3])
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geompy.addToStudyInFather( box, edgesF1, "edgesF1" )
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geompy.addToStudyInFather( box, edgesF2, "edgesF2" )
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# Make the source mesh with prisms
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src_mesh = Mesh(box, "Source mesh")
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src_mesh.Segment().NumberOfSegments(9,10)
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src_mesh.Quadrangle()
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src_mesh.Hexahedron()
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src_mesh.Triangle(f1) # triangular sumbesh
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src_mesh.Compute()
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# Mesh the box using projection algoritms
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# Define the same global 1D and 2D hypotheses
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tgt_mesh = Mesh(box, "Target mesh")
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tgt_mesh.Segment().NumberOfSegments(9,10,UseExisting=True)
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tgt_mesh.Quadrangle()
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# Define Projection 1D algorithm to project 1d mesh elements from group edgesF2 to edgesF1
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# It is actually not needed, just a demonstration
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proj1D = tgt_mesh.Projection1D( edgesF1 )
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# each vertex must be at the end of a connected group of edges (or a sole edge)
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proj1D.SourceEdge( edgesF2, src_mesh, v2F1, v2F2 )
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# Define 2D hypotheses to project triangles from f1 face of the source mesh to
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# f2 face in the target mesh. Vertices specify how to associate sides of faces
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proj2D = tgt_mesh.Projection2D( f2 )
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proj2D.SourceFace( f1, src_mesh, v1F1, v1F2, v2F1, v2F2 )
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# 2D hypotheses to project triangles from f2 of target mesh to the face opposite to f2.
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# Association of face sides is default
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proj2D = tgt_mesh.Projection2D( f2opp )
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proj2D.SourceFace( f2 )
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# 3D hypotheses to project prisms from the source to the target mesh
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proj3D = tgt_mesh.Projection3D()
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proj3D.SourceShape3D( box, src_mesh, v1F1, v1F2, v2F1, v2F2 )
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tgt_mesh.Compute()
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# Move the source mesh to visualy compare the two meshes
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src_mesh.TranslateObject( src_mesh, MakeDirStruct( 210, 0, 0 ), Copy=False)
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\endcode
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<br>
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\anchor tui_fixed_points
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<h2>1D Mesh with Fixed Points example</h2>
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\code
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import salome
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import geompy
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import smesh
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import StdMeshers
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# Create face and explode it on edges
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face = geompy.MakeFaceHW(100, 100, 1)
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edges = geompy.SubShapeAllSorted(face, geompy.ShapeType["EDGE"])
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geompy.addToStudy( face, "Face" )
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# get the first edge from exploded result
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edge1 = geompy.GetSubShapeID(face, edges[0])
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# Define Mesh on previously created face
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Mesh_1 = smesh.Mesh(face)
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# Create Fixed Point 1D hypothesis and define parameters.
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# Note: values greater than 1.0 and less than 0.0 are not taken into account;
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# duplicated values are removed. Also, if not specified explicitly, values 0.0 and 1.0
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# add added automatically.
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# The number of segments should correspond to the number of points (NbSeg = NbPnt-1);
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# extra values of segments splitting parameter are not taken into account,
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# while missing values are considered to be equal to 1.
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Fixed_points_1D_1 = smesh.CreateHypothesis('FixedPoints1D')
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Fixed_points_1D_1.SetPoints( [ 1.1, 0.9, 0.5, 0.0, 0.5, -0.3 ] )
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Fixed_points_1D_1.SetNbSegments( [ 3, 1, 2 ] )
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Fixed_points_1D_1.SetReversedEdges( [edge1] )
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# Add hypothesis to mesh and define 2D parameters
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Mesh_1.AddHypothesis(Fixed_points_1D_1)
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Regular_1D = Mesh_1.Segment()
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Quadrangle_2D = Mesh_1.Quadrangle()
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# Compute mesh
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Mesh_1.Compute()
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\endcode
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\anchor tui_radial_quadrangle
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<h2> Radial Quadrangle 1D2D example </h2>
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\code
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from smesh import *
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SetCurrentStudy(salome.myStudy)
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# Create face from the wire and add to study
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Face = geompy.MakeSketcher("Sketcher:F 0 0:TT 20 0:R 90:C 20 90:WF", [0, 0, 0, 1, 0, 0, 0, 0, 1])
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geompy.addToStudy(Face,"Face")
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edges = geompy.SubShapeAllSorted(Face, geompy.ShapeType["EDGE"])
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circle, radius1, radius2 = edges
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geompy.addToStudyInFather(Face, radius1,"radius1")
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geompy.addToStudyInFather(Face, radius2,"radius2")
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geompy.addToStudyInFather(Face, circle,"circle")
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# Define geometry for mesh, and Radial Quadrange algorithm
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mesh = smesh.Mesh(Face)
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radial_Quad_algo = mesh.Quadrangle(algo=RADIAL_QUAD)
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# The Radial Quadrange algorithm can work without any hypothesis
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# In this case it uses "Default Nb of Segments" preferences parameter to discretize edges
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mesh.Compute()
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# The Radial Quadrange uses global or local 1d hypotheses if it does
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# not have its own hypotheses.
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# Define global hypotheses to discretize radial edges and a local one for circular edge
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global_Nb_Segments = mesh.Segment().NumberOfSegments(5)
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local_Nb_Segments = mesh.Segment(circle).NumberOfSegments(10)
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mesh.Compute()
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# Define own parameters of Radial Quadrange algorithm
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radial_Quad_algo.NumberOfLayers( 4 )
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mesh.Compute()
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\endcode
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\anchor tui_quadrangle_parameters
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<h2>Quadrangle Parameters example </h2>
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\code
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import geompy
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import smesh
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import StdMeshers
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# Get 1/4 part from the disk face.
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Box_1 = geompy.MakeBoxDXDYDZ(100, 100, 100)
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Disk_1 = geompy.MakeDiskR(100, 1)
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Common_1 = geompy.MakeCommon(Disk_1, Box_1)
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geompy.addToStudy( Disk_1, "Disk_1" )
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geompy.addToStudy( Box_1, "Box_1" )
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geompy.addToStudy( Common_1, "Common_1" )
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# Set the Geometry for meshing
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Mesh_1 = smesh.Mesh(Common_1)
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# Create Quadrangle parameters and define the Base Vertex.
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Quadrangle_Parameters_1 = smesh.CreateHypothesis('QuadrangleParams')
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Quadrangle_Parameters_1.SetTriaVertex( 8 )
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# Define 1D hypothesis and cmpute the mesh
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Regular_1D = Mesh_1.Segment()
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Nb_Segments_1 = Regular_1D.NumberOfSegments(10)
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Nb_Segments_1.SetDistrType( 0 )
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status = Mesh_1.AddHypothesis(Quadrangle_Parameters_1)
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Quadrangle_2D = Mesh_1.Quadrangle()
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Mesh_1.Compute()
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\endcode
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\n Other meshing algorithms:
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<ul>
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<li>\subpage tui_defining_blsurf_hypotheses_page</li>
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<li>\subpage tui_defining_ghs3d_hypotheses_page</li>
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</ul>
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*/
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