smesh/doc/salome/gui/SMESH/input/tui_defining_hypotheses.doc

/*!

\page tui_defining_hypotheses_page Defining Hypotheses and Algorithms

This page provides example codes of \ref tui_defining_meshing_algos
"defining algorithms" and hypotheses. 
<ul>
<li>Wire discretisation 1D algorithm
  <ul>
    <li>\ref tui_1d_arithmetic "Arithmetic 1D" hypothesis</li>
    <li>\ref tui_deflection_1d "Deflection 1D and Number of Segments" hypotheses</li>
    <li>\ref tui_start_and_end_length "Start and End Length" hypotheses</li>
    <li>\ref tui_average_length "Local Length"</li>
    <li>\ref tui_propagation "Propagation" additional hypothesis </li>
    <li>\ref tui_fixed_points "Fixed Points 1D" hypothesis</li>
  </ul>
</li>
<li>Triangle (Mefisto) 2D algorithm
  <ul>
    <li>\ref tui_max_element_area "Max Element Area" hypothesis </li>
    <li>\ref tui_length_from_edges "Length from Edges"
    hypothesis </li>
  </ul>
</li>
<li>Tetrahedron (Netgen) 3D algorithm
  <ul>
    <li> \ref tui_max_element_volume "Max. Element Volume"hypothesis </li>
    <li> \ref tui_viscous_layers "Viscous layers"</li>
  </ul>
</li>
<li>\ref tui_projection "Projection Algorithms"</li>
<li>\ref tui_radial_quadrangle "Radial Quadrangle 1D2D" algorithm</li>
<li>Quadrangle (Mapping) 2D algorithm
  <ul>
    <li> \ref tui_quadrangle_parameters "Quadrangle Parameters" hypothesis </li>
  </ul>
</li>
<li>\ref tui_import "Use Existing Elements" algorithm</li>
</ul>
<br>

<h2>Defining 1D Hypotheses</h2>

<br>
\anchor tui_1d_arithmetic
<h3>Arithmetic 1D</h3>

\code
import geompy
import smesh

# create a box
box = geompy.MakeBoxDXDYDZ(10., 10., 10.)
geompy.addToStudy(box, "Box")

# create a hexahedral mesh on the box
hexa = smesh.Mesh(box, "Box : hexahedrical mesh")

# create a Regular 1D algorithm for edges
algo1D = hexa.Segment()

# optionally reverse node distribution on certain edges
allEdges = geompy.SubShapeAllSortedIDs( box, geompy.ShapeType["EDGE"])
reversedEdges = [ allEdges[0], allEdges[4] ]

# define "Arithmetic1D" hypothesis to cut all edges in several segments with increasing arithmetic length 
algo1D.Arithmetic1D(1, 4, reversedEdges)

# create a quadrangle 2D algorithm for faces
hexa.Quadrangle()

# create a hexahedron 3D algorithm for solids
hexa.Hexahedron()

# compute the mesh
hexa.Compute()
\endcode

<br>
\anchor tui_deflection_1d
<h3>Deflection 1D and Number of Segments</h3>

\code
import geompy
import smesh

# create a face from arc and straight segment
px = geompy.MakeVertex(100., 0.  , 0.  )
py = geompy.MakeVertex(0.  , 100., 0.  )
pz = geompy.MakeVertex(0.  , 0.  , 100.)

exy = geompy.MakeEdge(px, py)
arc = geompy.MakeArc(py, pz, px)

wire = geompy.MakeWire([exy, arc])

isPlanarFace = 1
face1 = geompy.MakeFace(wire, isPlanarFace)
geompy.addToStudy(face1,"Face1")

# get edges from the face
e_straight,e_arc = geompy.SubShapeAll(face1, geompy.ShapeType["EDGE"])
geompy.addToStudyInFather(face1, e_arc, "Arc Edge")

# create hexahedral mesh
hexa = smesh.Mesh(face1, "Face : triangle mesh")

# define "NumberOfSegments" hypothesis to cut a straight edge in a fixed number of segments
algo1D = hexa.Segment()
algo1D.NumberOfSegments(6)

# define "MaxElementArea" hypothesis
algo2D = hexa.Triangle()
algo2D.MaxElementArea(70.0)

# define a local "Deflection1D" hypothesis on the arc
algo_local = hexa.Segment(e_arc)
algo_local.Deflection1D(1.0)

# compute the mesh
hexa.Compute()
\endcode

<br>
\anchor tui_start_and_end_length
<h3>Start and End Length</h3>

\code
from geompy import *
import smesh

# create a box
box = MakeBoxDXDYDZ(10., 10., 10.)
addToStudy(box, "Box")

# get one edge of the box to put local hypothesis on
p5 = MakeVertex(5., 0., 0.)
EdgeX = GetEdgeNearPoint(box, p5)
addToStudyInFather(box, EdgeX, "Edge [0,0,0 - 10,0,0]")

# create a hexahedral mesh on the box
hexa = smesh.Mesh(box, "Box : hexahedrical mesh")

# set algorithms
algo1D = hexa.Segment()
hexa.Quadrangle()
hexa.Hexahedron()

# define "NumberOfSegments" hypothesis to cut an edge in a fixed number of segments
algo1D.NumberOfSegments(4)

# create a local hypothesis
algo_local = hexa.Segment(EdgeX)

# define "StartEndLength" hypothesis to cut an edge in several segments with increasing geometric length
algo_local.StartEndLength(1, 6)

# define "Propagation" hypothesis that propagates all other hypothesis
# on all edges on the opposite side in case of quadrangular faces
algo_local.Propagation()

# compute the mesh
hexa.Compute()
\endcode

<br>
\anchor tui_average_length
<h3>Local Length</h3>

\code
from geompy import *
import smesh

# create a box
box = MakeBoxDXDYDZ(10., 10., 10.)
addToStudy(box, "Box")

# get one edge of the box to put local hypothesis on
p5 = MakeVertex(5., 0., 0.)
EdgeX = GetEdgeNearPoint(box, p5)
addToStudyInFather(box, EdgeX, "Edge [0,0,0 - 10,0,0]")

# create a hexahedral mesh on the box
hexa = smesh.Mesh(box, "Box : hexahedrical mesh")

# set algorithms
algo1D = hexa.Segment()
hexa.Quadrangle()
hexa.Hexahedron()

# define "NumberOfSegments" hypothesis to cut all edges in a fixed number of segments
algo1D.NumberOfSegments(4)

# create a sub-mesh
algo_local = hexa.Segment(EdgeX)

# define "LocalLength" hypothesis to cut an edge in several segments with the same length
algo_local.LocalLength(2.)

# define "Propagation" hypothesis that propagates all other hypothesis
# on all edges on the opposite side in case of quadrangular faces
algo_local.Propagation()

# compute the mesh
hexa.Compute()
\endcode

<br><h2>Defining 2D and 3D hypotheses</h2>

<br>
\anchor tui_max_element_area
<h3>Maximum Element Area</h3>

\code
import geompy
import smesh
import salome 

# create a face
px   = geompy.MakeVertex(100., 0.  , 0.  )
py   = geompy.MakeVertex(0.  , 100., 0.  )
pz   = geompy.MakeVertex(0.  , 0.  , 100.)

vxy = geompy.MakeVector(px, py)
arc = geompy.MakeArc(py, pz, px)
wire = geompy.MakeWire([vxy, arc])

isPlanarFace = 1
face = geompy.MakeFace(wire, isPlanarFace)

# add the face in the study
id_face = geompy.addToStudy(face, "Face to be meshed")

# create a mesh
tria_mesh = smesh.Mesh(face, "Face : triangulation")

# define 1D meshing:
algo = tria_mesh.Segment()
algo.NumberOfSegments(20)

# define 2D meshing:

# assign triangulation algorithm
algo = tria_mesh.Triangle()

# apply "Max Element Area" hypothesis to each triangle
algo.MaxElementArea(100)

# compute the mesh
tria_mesh.Compute()
\endcode

<br>
\anchor tui_max_element_volume
<h3>Maximum Element Volume</h3>

\code
import geompy
import smesh

# create a cylinder
cyl = geompy.MakeCylinderRH(30., 50.)
geompy.addToStudy(cyl, "cyl")

# create a mesh on the cylinder
tetra = smesh.Mesh(cyl, "Cylinder : tetrahedrical mesh")

# assign algorithms
algo1D = tetra.Segment()
algo2D = tetra.Triangle()
algo3D = tetra.Tetrahedron()

# assign 1D and 2D hypotheses
algo1D.NumberOfSegments(7)
algo2D.MaxElementArea(150.)

# assign Max Element Volume hypothesis
algo3D.MaxElementVolume(200.)

# compute the mesh
ret = tetra.Compute()
if ret == 0:
    print "probleme when computing the mesh"
else:
    print "Computation succeded"
\endcode

<br>
\anchor tui_length_from_edges
<h3>Length from Edges</h3>

\code
import geompy
import smesh

# create sketchers
sketcher1 = geompy.MakeSketcher("Sketcher:F 0 0:TT 70 0:TT 70 70:TT 0 70:WW")
sketcher2 = geompy.MakeSketcher("Sketcher:F 20 20:TT 50 20:TT 50 50:TT 20 50:WW")

# create a face from two wires
isPlanarFace = 1
face1 = geompy.MakeFaces([sketcher1, sketcher2], isPlanarFace)
geompy.addToStudy(face1, "Face1")

# create a mesh
tria = smesh.Mesh(face1, "Face : triangle 2D mesh")

# Define 1D meshing
algo1D = tria.Segment()
algo1D.NumberOfSegments(2)

# create and assign the algorithm for 2D meshing with triangles
algo2D = tria.Triangle()

# create and assign "LengthFromEdges" hypothesis to build triangles based on the length of the edges taken from the wire
algo2D.LengthFromEdges()

# compute the mesh
tria.Compute()
\endcode

<br><h2>Defining Additional Hypotheses</h2>

<br>
\anchor tui_propagation
<h3>Propagation</h3>

\code
from geompy import *
import smesh

# create a box
box = MakeBoxDXDYDZ(10., 10., 10.)
addToStudy(box, "Box")

# get one edge of the box to put local hypothesis on
p5 = MakeVertex(5., 0., 0.)
EdgeX = GetEdgeNearPoint(box, p5)
addToStudyInFather(box, EdgeX, "Edge [0,0,0 - 10,0,0]")

# create a hexahedral mesh on the box
hexa = smesh.Mesh(box, "Box : hexahedrical mesh")

# set global algorithms and hypotheses
algo1D = hexa.Segment()
hexa.Quadrangle()
hexa.Hexahedron()
algo1D.NumberOfSegments(4)

# create a sub-mesh with local 1D hypothesis and propagation
algo_local = hexa.Segment(EdgeX)

# define "Arithmetic1D" hypothesis to cut an edge in several segments with increasing length
algo_local.Arithmetic1D(1, 4)

# define "Propagation" hypothesis that propagates all other 1D hypotheses
# from all edges on the opposite side of a face in case of quadrangular faces
algo_local.Propagation()

# compute the mesh
hexa.Compute()
\endcode

<br>
\anchor tui_defining_meshing_algos
<h2>Defining Meshing Algorithms</h2>

\code
import geompy
import smesh

# create a box
box = geompy.MakeBoxDXDYDZ(10., 10., 10.)
geompy.addToStudy(box, "Box")

# 1. Create a hexahedral mesh on the box
hexa = smesh.Mesh(box, "Box : hexahedrical mesh")

# create a Regular 1D algorithm for edges
algo1D = hexa.Segment()

# create a quadrangle 2D algorithm for faces
algo2D = hexa.Quadrangle()

# create a hexahedron 3D algorithm for solids
algo3D = hexa.Hexahedron()

# define hypotheses
algo1D.Arithmetic1D(1, 4)

# compute the mesh
hexa.Compute()

# 2. Create a tetrahedral mesh on the box
tetra = smesh.Mesh(box, "Box : tetrahedrical mesh")

# create a Regular 1D algorithm for edges
algo1D = tetra.Segment()

# create a Mefisto 2D algorithm for faces
algo2D = tetra.Triangle()

# create a 3D algorithm for solids
algo3D = tetra.Tetrahedron()

# define hypotheses
algo1D.Arithmetic1D(1, 4)
algo2D.LengthFromEdges()

# compute the mesh
tetra.Compute()

\endcode

<br>
\anchor tui_projection
<h3>Projection Algorithms</h3>

\code
# Project prisms from one meshed box to another mesh on the same box

from smesh import *

# Prepare geometry

# Create a parallelepiped
box = geompy.MakeBoxDXDYDZ(200, 100, 70)
geompy.addToStudy( box, "box" )

# Get geom faces to mesh with triangles in the 1ts and 2nd meshes
faces = geompy.SubShapeAll(box, geompy.ShapeType["FACE"])
# 2 adjacent faces of the box
f1 = faces[2]
f2 = faces[0]
# face opposite to f2
f2opp = faces[1]

# Get vertices used to specify how to associate sides of faces at projection
[v1F1, v2F1] = geompy.SubShapeAll(f1, geompy.ShapeType["VERTEX"])[:2]
[v1F2, v2F2] = geompy.SubShapeAll(f2, geompy.ShapeType["VERTEX"])[:2]
geompy.addToStudyInFather( box, v1F1, "v1F1" )
geompy.addToStudyInFather( box, v2F1, "v2F1" )
geompy.addToStudyInFather( box, v1F2, "v1F2" )
geompy.addToStudyInFather( box, v2F2, "v2F2" )

# Make group of 3 edges of f1 and f2
edgesF1 = geompy.CreateGroup(f1, geompy.ShapeType["EDGE"])
geompy.UnionList( edgesF1, geompy.SubShapeAll(f1, geompy.ShapeType["EDGE"])[:3])
edgesF2 = geompy.CreateGroup(f2, geompy.ShapeType["EDGE"])
geompy.UnionList( edgesF2, geompy.SubShapeAll(f2, geompy.ShapeType["EDGE"])[:3])
geompy.addToStudyInFather( box, edgesF1, "edgesF1" )
geompy.addToStudyInFather( box, edgesF2, "edgesF2" )


# Make the source mesh with prisms
src_mesh = Mesh(box, "Source mesh")
src_mesh.Segment().NumberOfSegments(9,10)
src_mesh.Quadrangle()
src_mesh.Hexahedron()
src_mesh.Triangle(f1) # triangular sumbesh 
src_mesh.Compute()


# Mesh the box using projection algoritms

# Define the same global 1D and 2D hypotheses
tgt_mesh = Mesh(box, "Target mesh")
tgt_mesh.Segment().NumberOfSegments(9,10,UseExisting=True)
tgt_mesh.Quadrangle()

# Define Projection 1D algorithm to project 1d mesh elements from group edgesF2 to edgesF1
# It is actually not needed, just a demonstration
proj1D = tgt_mesh.Projection1D( edgesF1 )
# each vertex must be at the end of a connected group of edges (or a sole edge)
proj1D.SourceEdge( edgesF2, src_mesh, v2F1, v2F2 )

# Define 2D hypotheses to project triangles from f1 face of the source mesh to
# f2 face in the target mesh. Vertices specify how to associate sides of faces
proj2D = tgt_mesh.Projection2D( f2 )
proj2D.SourceFace( f1, src_mesh, v1F1, v1F2, v2F1, v2F2 )

# 2D hypotheses to project triangles from f2 of target mesh to the face opposite to f2.
# Association of face sides is default
proj2D = tgt_mesh.Projection2D( f2opp )
proj2D.SourceFace( f2 )

# 3D hypotheses to project prisms from the source to the target mesh
proj3D = tgt_mesh.Projection3D()
proj3D.SourceShape3D( box, src_mesh, v1F1, v1F2, v2F1, v2F2 )
tgt_mesh.Compute()

# Move the source mesh to visualy compare the two meshes
src_mesh.TranslateObject( src_mesh, MakeDirStruct( 210, 0, 0 ), Copy=False)

\endcode

<h3>Projection 1D2D</h3>

\code
# Project triangles from one meshed face to another mesh on the same box

from smesh import *

# Prepare geometry

# Create a box
box = geompy.MakeBoxDXDYDZ(100, 100, 100)

# Get geom faces to mesh with triangles in the 1ts and 2nd meshes
faces = geompy.SubShapeAll(box, geompy.ShapeType["FACE"])
# 2 adjacent faces of the box
Face_1 = faces[2]
Face_2 = faces[0]

geompy.addToStudy( box, 'box' )
geompy.addToStudyInFather( box, Face_1, 'Face_1' )
geompy.addToStudyInFather( box, Face_2, 'Face_2' )

# Make the source mesh with Netgem2D
src_mesh = Mesh(Face_1, "Source mesh")
src_mesh.Segment().NumberOfSegments(15)
src_mesh.Triangle()
src_mesh.Compute()

# Mesh the target mesh using the algoritm Projection1D2D
tgt_mesh = smesh.Mesh(Face_2, "Target mesh")
tgt_mesh.Projection1D2D().SourceFace(Face_1,src_mesh)
tgt_mesh.Compute()
\endcode

<br>

\anchor tui_fixed_points

<h2>1D Mesh with Fixed Points example</h2>

\code
import salome
import geompy
import smesh
import StdMeshers

# Create face and explode it on edges
face = geompy.MakeFaceHW(100, 100, 1)
edges = geompy.SubShapeAllSorted(face, geompy.ShapeType["EDGE"])
geompy.addToStudy( face, "Face" )

# get the first edge from exploded result
edge1 = geompy.GetSubShapeID(face, edges[0])

# Define Mesh on previously created face
Mesh_1 = smesh.Mesh(face)

# Create Fixed Point 1D hypothesis and define parameters.
# Note: values greater than 1.0 and less than 0.0 are not taken into account;
# duplicated values are removed. Also, if not specified explicitly, values 0.0 and 1.0
# add added automatically.
# The number of segments should correspond to the number of points (NbSeg = NbPnt-1);
# extra values of segments splitting parameter are not taken into account,
# while missing values are considered to be equal to 1.
Fixed_points_1D_1 = smesh.CreateHypothesis('FixedPoints1D')
Fixed_points_1D_1.SetPoints( [ 1.1, 0.9, 0.5, 0.0, 0.5, -0.3 ] )
Fixed_points_1D_1.SetNbSegments( [ 3, 1, 2 ] )
Fixed_points_1D_1.SetReversedEdges( [edge1] )

# Add hypothesis to mesh and define 2D parameters
Mesh_1.AddHypothesis(Fixed_points_1D_1)
Regular_1D = Mesh_1.Segment()
Quadrangle_2D = Mesh_1.Quadrangle()
# Compute mesh
Mesh_1.Compute()
\endcode

\anchor tui_radial_quadrangle
<h2> Radial Quadrangle 1D2D example </h2>
\code
from smesh import *

SetCurrentStudy(salome.myStudy)

# Create face from the wire and add to study
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])
geompy.addToStudy(Face,"Face")
edges = geompy.SubShapeAllSorted(Face, geompy.ShapeType["EDGE"])
circle, radius1, radius2 = edges
geompy.addToStudyInFather(Face, radius1,"radius1")
geompy.addToStudyInFather(Face, radius2,"radius2")
geompy.addToStudyInFather(Face, circle,"circle")


# Define geometry for mesh, and Radial Quadrange algorithm
mesh = smesh.Mesh(Face)
radial_Quad_algo = mesh.Quadrangle(algo=RADIAL_QUAD)

# The Radial Quadrange algorithm can work without any hypothesis
# In this case it uses "Default Nb of Segments" preferences parameter to discretize edges
mesh.Compute()

# The Radial Quadrange uses global or local 1d hypotheses if it does
# not have its own hypotheses.
# Define global hypotheses to discretize radial edges and a local one for circular edge
global_Nb_Segments = mesh.Segment().NumberOfSegments(5)
local_Nb_Segments  = mesh.Segment(circle).NumberOfSegments(10)
mesh.Compute()

# Define own parameters of Radial Quadrange algorithm
radial_Quad_algo.NumberOfLayers( 4 )
mesh.Compute()
\endcode

\anchor tui_quadrangle_parameters
<h2>Quadrangle Parameters example 1 (meshing a face with 3 edges) </h2>
\code
from smesh import *
SetCurrentStudy(salome.myStudy)

# Get 1/4 part from the disk face.
Box_1 = geompy.MakeBoxDXDYDZ(100, 100, 100)
Disk_1 = geompy.MakeDiskR(100, 1)
Common_1 = geompy.MakeCommon(Disk_1, Box_1)
geompy.addToStudy( Disk_1, "Disk_1" )
geompy.addToStudy( Box_1, "Box_1" )
geompy.addToStudy( Common_1, "Common_1" )

# Set the Geometry for meshing
Mesh_1 = smesh.Mesh(Common_1)


# Define 1D hypothesis and compute the mesh
Regular_1D = Mesh_1.Segment()
Nb_Segments_1 = Regular_1D.NumberOfSegments(10)
Nb_Segments_1.SetDistrType( 0 )

# Create Quadrangle parameters and define the Base Vertex.
Quadrangle_2D = Mesh_1.Quadrangle().TriangleVertex( 8 )

Mesh_1.Compute()
\endcode

<h2>Quadrangle Parameters example 2 (using different types) </h2>
\code
import geompy
import smesh
import StdMeshers

# Make quadrangle face and explode it on edges.
Vertex_1 = geompy.MakeVertex(0, 0, 0)
Vertex_2 = geompy.MakeVertex(40, 0, 0)
Vertex_3 = geompy.MakeVertex(40, 30, 0)
Vertex_4 = geompy.MakeVertex(0, 30, 0)
Quadrangle_Face_1 = geompy.MakeQuad4Vertices(Vertex_1, Vertex_4, Vertex_3, Vertex_2)
[Edge_1,Edge_2,Edge_3,Edge_4] = geompy.SubShapeAllSorted(Quadrangle_Face_1, geompy.ShapeType["EDGE"])
geompy.addToStudy( Vertex_1, "Vertex_1" )
geompy.addToStudy( Vertex_2, "Vertex_2" )
geompy.addToStudy( Vertex_3, "Vertex_3" )
geompy.addToStudy( Vertex_4, "Vertex_4" )
geompy.addToStudy( Quadrangle_Face_1, "Quadrangle Face_1" )
geompy.addToStudyInFather( Quadrangle_Face_1, Edge_2, "Edge_2" )

# Set the Geometry for meshing
Mesh_1 = smesh.Mesh(Quadrangle_Face_1)

# Create Quadrangle parameters and
# define the Type as Quadrangle Preference
Quadrangle_Parameters_1 = smesh.CreateHypothesis('QuadrangleParams')
Quadrangle_Parameters_1.SetQuadType( StdMeshers.QUAD_QUADRANGLE_PREF )

# Define other hypotheses and algorithms
Regular_1D = Mesh_1.Segment()
Nb_Segments_1 = Regular_1D.NumberOfSegments(4)
Nb_Segments_1.SetDistrType( 0 )
status = Mesh_1.AddHypothesis(Quadrangle_Parameters_1)
Quadrangle_2D = Mesh_1.Quadrangle()

# Define submesh on one edge to provide different number of segments
Regular_1D_1 = Mesh_1.Segment(geom=Edge_2)
Nb_Segments_2 = Regular_1D_1.NumberOfSegments(10)
Nb_Segments_2.SetDistrType( 0 )
SubMesh_1 = Regular_1D_1.GetSubMesh()

# Compute mesh (with Quadrangle Preference type)
isDone = Mesh_1.Compute()

# Change type to Reduced and compute again
Quadrangle_Parameters_1.SetQuadType( StdMeshers.QUAD_REDUCED )
isDone = Mesh_1.Compute()
\endcode

\anchor tui_import
<h2>"Use Existing Elements" example </h2>
\code

from smesh import *
SetCurrentStudy(salome.myStudy)

# Make a patritioned box

box = geompy.MakeBoxDXDYDZ(100,100,100)

N = geompy.MakeVectorDXDYDZ( 1,0,0 )
O = geompy.MakeVertex( 50,0,0 )
plane = geompy.MakePlane( O, N, 200 ) # plane YOZ

shape2boxes = geompy.MakeHalfPartition( box, plane )
boxes = geompy.SubShapeAllSorted(shape2boxes, geompy.ShapeType["SOLID"])

geompy.addToStudy( boxes[0], "boxes[0]")
geompy.addToStudy( boxes[1], "boxes[1]")
midFace0 = geompy.SubShapeAllSorted(boxes[0], geompy.ShapeType["FACE"])[5]
geompy.addToStudyInFather( boxes[0], midFace0, "middle Face")
midFace1 = geompy.SubShapeAllSorted(boxes[1], geompy.ShapeType["FACE"])[0]
geompy.addToStudyInFather( boxes[1], midFace1, "middle Face")

# Mesh one of boxes with quadrangles. It is a source mesh

srcMesh = Mesh(boxes[0], "source mesh") # box coloser to CS origin
nSeg1 = srcMesh.Segment().NumberOfSegments(4)
srcMesh.Quadrangle()
srcMesh.Compute()
srcFaceGroup = srcMesh.GroupOnGeom( midFace0, "src faces", FACE )

# Import faces from midFace0 to the target mesh

tgtMesh = Mesh(boxes[1], "target mesh")
importAlgo = tgtMesh.UseExisting2DElements(midFace1)
import2hyp = importAlgo.SourceFaces( [srcFaceGroup] )
tgtMesh.Segment().NumberOfSegments(3)
tgtMesh.Quadrangle()
tgtMesh.Compute()

# Import the whole source mesh with groups
import2hyp.SetCopySourceMesh(True,True)
tgtMesh.Compute()
\endcode

\anchor tui_viscous_layers
<h2>Viscous layers construction</h2>

\code
from smesh import *
SetCurrentStudy(salome.myStudy)

X = geompy.MakeVectorDXDYDZ( 1,0,0 )
O = geompy.MakeVertex( 100,50,50 )
plane = geompy.MakePlane( O, X, 200 ) # plane YZ

box = geompy.MakeBoxDXDYDZ(200,100,100)

shape = geompy.MakeHalfPartition( box, plane )

faces = geompy.SubShapeAllSorted(shape, geompy.ShapeType["FACE"])
face1 = faces[1]
ignoreFaces = [ faces[0], faces[-1]]

geompy.addToStudy( shape, "shape" )
geompy.addToStudyInFather( shape, face1, "face1")


mesh = Mesh(shape, "CFD")

mesh.Segment().NumberOfSegments( 4 )

mesh.Triangle()
mesh.Quadrangle(face1)
mesh.Compute()
algo3D = mesh.Tetrahedron()

thickness = 20
numberOfLayers = 10
stretchFactor = 1.5
layersHyp = algo3D.ViscousLayers(thickness,numberOfLayers,stretchFactor,ignoreFaces)

mesh.Compute()

mesh.MakeGroup("Tetras",VOLUME,FT_ElemGeomType,"=",Geom_TETRA)
mesh.MakeGroup("Pyras",VOLUME,FT_ElemGeomType,"=",Geom_PYRAMID)
mesh.MakeGroup("Prims",VOLUME,FT_ElemGeomType,"=",Geom_PENTA)

\endcode

*/