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192 lines
4.2 KiB
Plaintext
192 lines
4.2 KiB
Plaintext
/*!
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\page tui_creating_meshes_page Creating Meshes
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\n First of all see \ref introduction_to_mesh_python_page "Example of 3d mesh generation",
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which is an example of good python script style for Mesh module.
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<br>
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<h2>Construction of a Mesh</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.MakeBox(0., 0., 0., 100., 200., 300.)
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idbox = geompy.addToStudy(box, "box")
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# create a mesh
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tetra = smesh.Mesh(box, "MeshBox")
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algo1D = tetra.Segment()
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algo1D.NumberOfSegments(7)
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algo2D = tetra.Triangle()
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algo2D.MaxElementArea(800.)
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algo3D = tetra.Tetrahedron(smesh.NETGEN)
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algo3D.MaxElementVolume(900.)
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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 "problem when computing the mesh"
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else:
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print "mesh computed"
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pass
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\endcode
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<br>
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\anchor tui_construction_submesh
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<h2>Construction of a Submesh</h2>
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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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# select one edge of the box for definition of a local hypothesis
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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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quadra = smesh.Mesh(box, "Box : quadrangle 2D mesh")
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# create a regular 1D algorithm for the faces
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algo1D = quadra.Segment()
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# define "NumberOfSegments" hypothesis to cut
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# all the edges in a fixed number of segments
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algo1D.NumberOfSegments(4)
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# create a quadrangle 2D algorithm for the faces
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quadra.Quadrangle()
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# construct a submesh on the edge with a local hypothesis
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algo_local = quadra.Segment(EdgeX)
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# define "Arithmetic1D" hypothesis to cut the edge in several segments with increasing arithmetic length
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algo_local.Arithmetic1D(1, 4)
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# define "Propagation" hypothesis that propagates all other hypotheses
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# on all edges of 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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quadra.Compute()
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\endcode
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<br>
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\anchor tui_editing_mesh
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<h2>Editing of a mesh</h2>
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\code
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import geompy
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import smesh
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def PrintMeshInfo(theMesh):
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aMesh = theMesh.GetMesh()
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print "Information about mesh:"
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print "Number of nodes : ", aMesh.NbNodes()
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print "Number of edges : ", aMesh.NbEdges()
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print "Number of faces : ", aMesh.NbFaces()
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print "Number of volumes : ", aMesh.NbVolumes()
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pass
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# create a box
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box = geompy.MakeBox(0., 0., 0., 20., 20., 20.)
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geompy.addToStudy(box, "box")
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# select one edge of the box for definition of a local hypothesis
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subShapeList = geompy.SubShapeAll(box, geompy.ShapeType["EDGE"])
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edge = subShapeList[0]
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name = geompy.SubShapeName(edge, box)
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geompy.addToStudyInFather(box, edge, name)
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# create a mesh
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tria = smesh.Mesh(box, "Mesh 2D")
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algo1D = tria.Segment()
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hyp1 = algo1D.NumberOfSegments(3)
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algo2D = tria.Triangle()
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hyp2 = algo2D.MaxElementArea(10.)
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# create a sub-mesh
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algo_local = tria.Segment(edge)
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hyp3 = algo_local.Arithmetic1D(1, 6)
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hyp4 = algo_local.Propagation()
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# compute the mesh
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tria.Compute()
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PrintMeshInfo(tria)
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# remove a local hypothesis
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mesh = tria.GetMesh()
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mesh.RemoveHypothesis(edge, hyp4)
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# compute the mesh
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tria.Compute()
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PrintMeshInfo(tria)
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# change the value of the 2D hypothesis
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hyp2.SetMaxElementArea(2.)
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# compute the mesh
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tria.Compute()
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PrintMeshInfo(tria)
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\endcode
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<br>
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\anchor tui_export_mesh
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<h2>Export of a Mesh</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.MakeBox(0., 0., 0., 100., 200., 300.)
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idbox = geompy.addToStudy(box, "box")
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# create a mesh
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tetra = smesh.Mesh(box, "MeshBox")
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algo1D = tetra.Segment()
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algo1D.NumberOfSegments(7)
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algo2D = tetra.Triangle()
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algo2D.MaxElementArea(800.)
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algo3D = tetra.Tetrahedron(smesh.NETGEN)
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algo3D.MaxElementVolume(900.)
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# compute the mesh
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tetra.Compute()
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# export the mesh in a MED file
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tetra.ExportMED("/tmp/meshMED.med", 0)
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\endcode
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<br>
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<h2>How to mesh a cylinder with hexahedrons?</h2>
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Here you can see an example of python script, creating a hexahedral
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mesh on a cylinder. And a picture below the source code of the script,
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demonstrating the resulting mesh.
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\include ex24_cylinder.py
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\image html mesh_cylinder_hexa.png
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<br>
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\anchor tui_building_compound
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<h2>Building a compound of meshes</h2>
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\dontinclude SMESH_BuildCompound.py
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\skipline import geompy
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\until #end
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*/
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