Hello,
I'm trying to build a preprocessor for a FE calculation, and I'm running
into a bit of trouble with the mesh generation. Using the smesh module
in Salome, I could do something like this:
tetra = smesh.Mesh(part, "Sqmesh")
algo1D = tetra.Segment()
algo1D.LocalLength(2.0)
algo2D = tetra.Triangle()
algo2D.MaxElementArea(5.0)
algo3d = tetra.Tetrahedron()
algo3D.MaxElementVolume(25.0)
ret = tetra.Compute()
>From the writeup at
http://www.pythonocc.org/resources/meshing/pythonocc-and-smesh/, it
looks like I ought to be able to do essentially the same thing in
pythonocc, but there seems to be a disconnect between the way the code
in the writeup access the mesh generator and its algorithms (i.e.,
meshgen = MT.MeshGen(), etc.) and the module hierarchy present in my
version (0.6-alpha) of pythonocc. In particular, I can't find a module
called MT, and the SMESH module doesn't have all the same parts.
By looking at the code in the examples directory, I've made a function
to generate a surface mesh for a compound object:
def mesh_compound(comp):
meshgen = SMESH_Gen()
themesh = meshgen.CreateMesh(0,True)
an1DHypothesis = StdMeshers_Arithmetic1D(0,0,meshgen)
an1DHypothesis.SetLength(0.01, False)
an1DHypothesis.SetLength(1., True)
an1dAlgo = StdMeshers_Regular_1D(1,0,meshgen)
a2dHypothesis = StdMeshers_QuadranglePreference(2,0,meshgen)
a2dAlgo = StdMeshers_Quadrangle_2D(3,0,meshgen)
themesh.ShapeToMesh(comp)
# assign hypotheses
themesh.AddHypothesis(comp,0)
themesh.AddHypothesis(comp,1)
themesh.AddHypothesis(comp,2)
themesh.AddHypothesis(comp,3)
#compute
meshgen.Compute(themesh, themesh.GetShapeToMesh())
return themesh
My questions are these:
1. Where is the Netgen mesher located? I can't find it in
OCC.StdMeshers or OCC.SMESH (or anywhere else I've looked, for that matter).
2. There doesn't seem to be a StdMeshers_Triangle_2D. Is that correct?
3. Am I missing something? I'd prefer to be able to use the
Salome-style syntax, as it is clearer to me, but I can't figure out how
to do so.
Again, I'm using OCE version 0.12, pythonocc version 0.6dev, python
2.7.2 on os X 10.8
Thanks,
Cavendish
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