smesh/doc/salome/examples/defining_hypotheses_ex07.py

# Length from Edges

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)

# 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.LocalLength(3.)

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

# create and assign "LengthFromEdges" hypothesis to build triangles with
# linear size close to the length of the segments generated on the face wires (3.)
algo2D.LengthFromEdges()

# compute the mesh
tria.Compute()