Fix group of faces identification from dual mesh skin

src/SMESH_SWIG/smesh_tools.py

@@ -73,18 +73,18 @@ def smesh_create_dual_mesh(mesh_ior, output_file, adapt_to_shape=True, mesh_name
 
         grp_poly = mesh2d[id_grp_poly]
 
-        # We use the interpolation to remove the element that are not really in
-        # the group (the ones that are next to a nodes nut not in the group
-        # will have the sum of their column in the enterpolation matrix equal
-        # to zero)
-        rem = mc.MEDCouplingRemapper()
+        # find the extra face cells, on the border of the group (lying on nodes, but outside the group)
+        id_poly_border = grp_poly.findCellIdsOnBoundary()
 
-        rem.prepare(grp_poly, grp_tria, "P0P0")
-        m = rem.getCrudeCSRMatrix()
-        _, id_to_keep = np.where(m.sum(dtype=np.int64, axis=0) >= 1e-07)
+        # ids of the cells in grp_poly
+        id_poly=mc.DataArrayInt64.New(grp_poly.getNumberOfCells(), 1)
+        id_poly.iota()
 
-        id_grp_poly = id_grp_poly[id_to_keep.tolist()]
-        id_grp_poly.setName(grp_name)
+        # cells that are really in the group
+        id_to_keep = id_poly.buildSubstraction(id_poly_border)
+
+        id_grp_poly = id_grp_poly[id_to_keep]
+        id_grp_poly.setName(grp_name.strip())
 
         myfile.addGroup(-1, id_grp_poly)
 

test/SMESH_create_dual_mesh_tpipe.py

@@ -0,0 +1,134 @@
+#!/usr/bin/env python3
+
+import sys
+import salome
+import math
+
+salome.salome_init()
+
+import GEOM
+from salome.geom import geomBuilder
+
+geompy = geomBuilder.New()
+
+# first cylinder
+r1 = 0.5
+h1 = 5
+
+# second cylinder
+r2 = 0.3
+h2 = 3
+
+length_piquage = 1.5
+
+O = geompy.MakeVertex(0, 0, 0)
+OX = geompy.MakeVectorDXDYDZ(1, 0, 0)
+OY = geompy.MakeVectorDXDYDZ(0, 1, 0)
+OZ = geompy.MakeVectorDXDYDZ(0, 0, 1)
+geompy.addToStudy( O, 'O' )
+geompy.addToStudy( OX, 'OX' )
+geompy.addToStudy( OY, 'OY' )
+geompy.addToStudy( OZ, 'OZ' )
+
+Cylinder_1 = geompy.MakeCylinderRH(r1, h1)
+Cylinder_2 = geompy.MakeCylinderRH(r2, h2)
+Rotation_1 = geompy.MakeRotation(Cylinder_2, OY, -90*math.pi/180.0)
+Translation_1 = geompy.MakeTranslation(Rotation_1, 0, 0, length_piquage)
+
+tpipe = geompy.MakeFuseList([Cylinder_1, Translation_1], True, True)
+geompy.addToStudy( tpipe, 'tpipe' )
+
+Inlet_z = geompy.GetFaceNearPoint(tpipe, O)
+geompy.addToStudyInFather( tpipe, Inlet_z, 'Inlet_z' )
+
+p_inlet_x = geompy.MakeVertex(-h2, 0, length_piquage)
+Inlet_x = geompy.GetFaceNearPoint(tpipe, p_inlet_x)
+geompy.addToStudyInFather( tpipe, Inlet_x, 'Inlet_x' )
+
+p_outlet = geompy.MakeVertex(0, 0, h1)
+Outlet = geompy.GetFaceNearPoint(tpipe, p_outlet)
+geompy.addToStudyInFather( tpipe, Outlet, 'Outlet' )
+
+Wall = geompy.CreateGroup(tpipe, geompy.ShapeType["FACE"])
+faces = geompy.SubShapeAll(tpipe, geompy.ShapeType["FACE"])
+geompy.UnionList(Wall, faces)
+geompy.DifferenceList(Wall, [Inlet_x, Inlet_z, Outlet])
+geompy.addToStudyInFather( tpipe, Wall, 'Wall' )
+
+p_corner = geompy.MakeVertex(-r2, 0, length_piquage+r2)
+corner = geompy.GetVertexNearPoint(tpipe, p_corner)
+geompy.addToStudyInFather( tpipe, corner, 'corner' )
+
+geom_groups = [Inlet_x, Inlet_z, Outlet, Wall]
+
+volumeGEOM = geompy.BasicProperties(tpipe)[2]
+
+###
+### SMESH component
+###
+
+import  SMESH, SALOMEDS
+from salome.smesh import smeshBuilder
+
+from salome.StdMeshers import StdMeshersBuilder
+
+smesh = smeshBuilder.New()
+
+# Coarse mesh with default hypothesis
+Mesh_1 = smesh.Mesh(tpipe, "Mesh_coarse")
+
+Mesh_1.Triangle(algo=smeshBuilder.NETGEN_1D2D)
+
+Mesh_1.Tetrahedron(algo=smeshBuilder.NETGEN_3D)
+isDone = Mesh_1.Compute()
+
+# Create groups
+d_mesh_groups = {}
+for geom_group in geom_groups:
+  gr = Mesh_1.Group(geom_group)
+  gr_name = gr.GetName()
+  d_mesh_groups[gr_name] = gr
+
+# Check tetra mesh volume
+mesh_volume = smesh.GetVolume(Mesh_1)
+shape_volume = geompy.BasicProperties(tpipe)[2]
+assert abs(mesh_volume-shape_volume)/shape_volume < 0.05
+
+dual_Mesh_raw_1 = smesh.CreateDualMesh(Mesh_1, 'dual_Mesh_raw_1', False)
+
+# check polyhedrons
+assert dual_Mesh_raw_1.NbPolyhedrons() > 0
+assert dual_Mesh_raw_1.NbPolyhedrons() == dual_Mesh_raw_1.NbVolumes()
+
+# Check dual mesh volume
+dual_raw_volume = dual_Mesh_raw_1.GetVolume()
+assert abs(dual_raw_volume-shape_volume)/shape_volume < 0.11
+
+# Check groups
+dual_Mesh_raw_groups = dual_Mesh_raw_1.GetGroups()
+dual_Mesh_raw_group_names = dual_Mesh_raw_1.GetGroupNames()
+
+assert len(dual_Mesh_raw_groups) == 4
+
+for gr_dual, gr_name in zip(dual_Mesh_raw_groups, dual_Mesh_raw_group_names):
+  gr_name = gr_name.strip()
+  gr_tri = d_mesh_groups[gr_name]
+  area_gr_tri = smesh.GetArea(gr_tri)
+  area_gr_dual = smesh.GetArea(gr_dual)
+  print(gr_name)
+  print("Area tri: ", area_gr_tri)
+  print("Area dual:", area_gr_dual)
+  assert abs(area_gr_tri-area_gr_dual)/area_gr_tri < 1e-3
+
+#dual_Mesh_1 = smesh.CreateDualMesh(Mesh_1, 'dual_Mesh_1', True)
+
+
+#dual_volume = dual_Mesh_1.GetVolume()
+#dual_raw_volume = dual_Mesh_raw_1.GetVolume()
+#print("dual_volume: ", dual_volume)
+#print("dual_raw_volume: ", dual_raw_volume)
+
+#assert (dual_volume >= dual_raw_volume)
+
+if salome.sg.hasDesktop():
+  salome.sg.updateObjBrowser()

test/tests.set

@@ -63,6 +63,7 @@ SET(BAD_TESTS
   SMESH_test2.py
   SMESH_test4.py
   SMESH_create_dual_mesh_adapt.py
+  SMESH_create_dual_mesh_tpipe.py
   )
 IF(NOT WIN32)
   LIST(APPEND BAD_TESTS