smesh/doc/salome/examples/cartesian_algo.py

# Usage of Body Fitting algorithm


import salome
salome.salome_init()
import GEOM
from salome.geom import geomBuilder
geompy = geomBuilder.New(salome.myStudy)

import SMESH, SALOMEDS
from salome.smesh import smeshBuilder
smesh =  smeshBuilder.New(salome.myStudy)
import salome_notebook


# create a sphere
sphere = geompy.MakeSphereR( 50 )
geompy.addToStudy( sphere, "sphere" )

# create a mesh and assign a "Body Fitting" algo
mesh = smesh.Mesh( sphere )
cartAlgo = mesh.BodyFitted()

# define a cartesian grid using Coordinates
coords = list(range(-100,100,10))
cartHyp = cartAlgo.SetGrid( coords,coords,coords, 1000000)

# compute the mesh
mesh.Compute()
print("nb hexahedra",mesh.NbHexas())
print("nb tetrahedra",mesh.NbTetras())
print("nb polyhedra",mesh.NbPolyhedrons())
print()

# define the grid by setting constant spacing
cartHyp = cartAlgo.SetGrid( "10","10","10", 1000000)

mesh.Compute()
print("nb hexahedra",mesh.NbHexas())
print("nb tetrahedra",mesh.NbTetras())
print("nb polyhedra",mesh.NbPolyhedrons())


# define the grid by setting different spacing in 2 sub-ranges of geometry
spaceFuns = ["5","10+10*t"]
cartAlgo.SetGrid( [spaceFuns, [0.5]], [spaceFuns, [0.5]], [spaceFuns, [0.25]], 10 )

mesh.Compute()
print("nb hexahedra",mesh.NbHexas())
print("nb tetrahedra",mesh.NbTetras())
print("nb polyhedra",mesh.NbPolyhedrons())
print()

# Example of customization of dirtections of the grid axes

# make a box with non-orthogonal edges
xDir = geompy.MakeVectorDXDYDZ( 1.0, 0.1, 0.0, "xDir" )
yDir = geompy.MakeVectorDXDYDZ(-0.1, 1.0, 0.0, "yDir"  )
zDir = geompy.MakeVectorDXDYDZ( 0.2, 0.3, 1.0, "zDir"  )
face = geompy.MakePrismVecH( xDir, yDir, 1.0 )
box  = geompy.MakePrismVecH( face, zDir, 1.0, theName="box" )

spc = "0.1" # spacing

# default axes
mesh = smesh.Mesh( box, "custom axes")
algo = mesh.BodyFitted()
algo.SetGrid( spc, spc, spc, 10000 )
mesh.Compute()
print("Default axes")
print("   nb hex:",mesh.NbHexas())

# set axes using edges of the box
algo.SetAxesDirs( xDir, [-0.1,1,0], zDir )
mesh.Compute()
print("Manual axes")
print("   nb hex:",mesh.NbHexas())

# set optimal orthogonal axes
algo.SetOptimalAxesDirs( isOrthogonal=True )
mesh.Compute()
print("Optimal orthogonal axes")
print("   nb hex:",mesh.NbHexas())

# set optimal non-orthogonal axes
algo.SetOptimalAxesDirs( isOrthogonal=False )
mesh.Compute()
print("Optimal non-orthogonal axes")
print("   nb hex:",mesh.NbHexas())