#!/usr/bin/env python3
-import sys
import salome
import medcoupling as mc
-from math import pi
-
-#salome.salome_init()
import GEOM
from salome.geom import geomBuilder
smesh = smeshBuilder.New()
-def create_dual_mesh(mesh_ior, output_file, adapt_to_shape=True, mesh_name="MESH"):
+from salome.kernel.logger import Logger
+logger = Logger("salome.smesh.smesh_tools")
+logger.setLevel("WARNING")
+
+# prefix for groups with internal usage
+# i.e. used to transfer the faces and edges sub-shapes ids to the mesh
+__prefix = "____"
+
+def __getIdsGrpDualFromOrig(mc_mesh_file, grp_name, mesh2d, grp_level):
+ """ Identify the polygonal cells ids matching the original group on the
+ original mesh (before dual mesh)
+
+ Args:
+ mc_mesh_file (MEDFileMesh): mesh on which to read the group
+ grp_name (string): name of the group to read
+ mesh2d (MEDCouplingUMesh): mesh at lower level (-1 or -2) containing
+ faces or segments cells
+ grp_level (int): level on which to load the group (-1 or -2)
+
+ Returns:
+ id_grp_poly (DataArrayInt64): ids of cells mathcing the group. None if
+ the group has not been found.
+ nodes_added (DataArrayInt64): new nodes added on the dual mesh
+ """
+ try:
+ grp_tria = mc_mesh_file.getGroup(grp_level, grp_name)
+ except:
+ logger.debug("""No group found for %s at level %i.
+ It is normal behaviour for degenerated geom edge."""\
+ %(grp_name, grp_level))
+ return None, None
+ # Retrieve the nodes in group
+ orig_grp_nodes = grp_tria.computeFetchedNodeIds()
+ # Find all the cells lying on one of the nodes
+ id_grp_poly = mesh2d.getCellIdsLyingOnNodes(orig_grp_nodes, False)
+
+ grp_poly = mesh2d[id_grp_poly]
+ if grp_poly.getNumberOfCells() == 0:
+ logger.debug("""No poly cell found for %s at level %i."""\
+ %(grp_name, grp_level))
+ return None, None
+
+ # find the extra face cells, on the border of the group (lying on nodes,
+ # but outside the group)
+ id_poly_border = grp_poly.findCellIdsOnBoundary()
+
+ # ids of the cells in grp_poly
+ id_poly = mc.DataArrayInt64.New(grp_poly.getNumberOfCells(), 1)
+ id_poly.iota()
+
+ # 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())
+
+ # get nodes added on this group
+ grp_poly = mesh2d[id_grp_poly]
+ grp_nodes_poly = grp_poly.computeFetchedNodeIds()
+ nodes_added = grp_nodes_poly.buildSubstraction(orig_grp_nodes)
+
+ return id_grp_poly, nodes_added
+
+def __projectNodeOnSubshape(nodes, subshape, coords):
+ """ Project nodes on a sub-shape (face or edge) and update the mesh
+ coordinates
+
+ Args:
+ nodes (DataArrayInt): nodes ids to project
+ subshape (GEOM object): face or edge on which to project the nodes
+ coords (DataArrayDouble): coordinates of the mesh to update. These
+ coordinates are modified inside this function.
+ """
+ for i in nodes:
+ x, y, z = coords[i].getValues()
+ vertex = geompy.MakeVertex(x, y, z)
+ try:
+ prj = geompy.MakeProjection(vertex, subshape)
+ except:
+ logger.warning("Projection failed for %.5f %.5f %.5f but we continue with next node"%(x, y, z))
+ continue
+ new_coor = geompy.PointCoordinates(prj)
+ # update its coordinates in the mesh
+ coords[i] = new_coor
+ pass
+
+def __deleteObj(theObj):
+ """ Delete object from a Study
+
+ Args:
+ theObj (GEOM or SMESH object): object to remove from the study
+ """
+ aStudy = salome.myStudy
+ aStudyBuilder = aStudy.NewBuilder()
+ SO = aStudy.FindObjectIOR(aStudy.ConvertObjectToIOR(theObj))
+ if SO is not None:
+ aStudyBuilder.RemoveObjectWithChildren(SO)
+ pass
+
+def smesh_create_dual_mesh(mesh_ior, output_file, adapt_to_shape=True,
+ mesh_name="MESH"):
""" Create a dual of the mesh in input_file into output_file
Args:
mesh_ior (string): corba Id of the Tetrahedron mesh
output_file (string): dual mesh file
+ adapt_to_shape (bool): If True will project boundary points on shape
+ mesh_name (string): Name of the dual Mesh
"""
# Import mesh from file
- # mesh = salome.orb.string_to_object(salome.salome_study.myStudy.FindObjectID(mesh_id).GetIOR())
mesh = salome.orb.string_to_object(mesh_ior)
if not mesh:
raise Exception("Could not find mesh using id: ", mesh_ior)
shape = mesh.GetShapeToMesh()
+ if adapt_to_shape:
+ faces = geompy.SubShapeAll(shape, geompy.ShapeType["FACE"])
+ faces_ids = geompy.GetSubShapesIDs(shape, faces)
+
+ # Create group with each face
+ # so that we don't need GetFaceNearPoint to get the face to project the
+ # point to
+ id2face = {}
+ id2face_edges_ids = {}
+ mesh_groups = []
+ for face, face_id in zip(faces, faces_ids):
+ gr_mesh = mesh.CreateGroupFromGEOM(SMESH.FACE,
+ '%sface_%i'%(__prefix, face_id),
+ face)
+ id2face[face_id] = face
+ mesh_groups.append(gr_mesh)
+ # get the edges bounding this face
+ # so that we can project the nodes on edges before nodes on faces
+ face_edges = geompy.SubShapeAll(face, geompy.ShapeType["EDGE"])
+ face_edges_ids = geompy.GetSubShapesIDs(shape, face_edges)
+ id2face_edges_ids[face_id] = face_edges_ids
+
+ edges = geompy.SubShapeAll(shape, geompy.ShapeType["EDGE"])
+ edges_ids = geompy.GetSubShapesIDs(shape, edges)
+
+ id2edge = {}
+ for edge, edge_id in zip(edges, edges_ids):
+ gr_mesh = mesh.CreateGroupFromGEOM(SMESH.EDGE,
+ '%sedge_%i'%(__prefix, edge_id),
+ edge)
+ id2edge[edge_id] = edge
+ mesh_groups.append(gr_mesh)
+
# We got a meshProxy so we need to convert pointer to MEDCoupling
int_ptr = mesh.ExportMEDCoupling(True, True)
dab = mc.FromPyIntPtrToDataArrayByte(int_ptr)
- tetras = mc.MEDFileMesh.New(dab)[0]
+ mc_mesh_file = mc.MEDFileMesh.New(dab)
+ tetras = mc_mesh_file[0]
# End of SMESH -> MEDCoupling part for dualmesh
tetras = mc.MEDCoupling1SGTUMesh(tetras)
+
+ # Create the polyhedra from the tetrahedra (main goal of this function)
polyh = tetras.computeDualMesh()
- skin = tetras.buildUnstructured().computeSkin()
- skin_polyh = polyh.buildUnstructured().computeSkin()
- allNodesOnSkinPolyh = skin_polyh.computeFetchedNodeIds()
- allNodesOnSkin = skin.computeFetchedNodeIds()
- ptsAdded = allNodesOnSkinPolyh.buildSubstraction(allNodesOnSkin)
- ptsAddedMesh = mc.MEDCouplingUMesh.Build0DMeshFromCoords( skin_polyh.getCoords()[ptsAdded] )
- if adapt_to_shape:
- ptsAddedCoo = ptsAddedMesh.getCoords()
- ptsAddedCooModified = ptsAddedCoo[:]
-
- # We need the geometry for that
- # TODO : Loop on faces identify points associated to which face
- faces = geompy.ExtractShapes(shape, geompy.ShapeType["FACE"], True)
- #assert( len(faces) == 1 )
- ## projection des points ajoutés par le dual sur la surface
- #for i,tup in enumerate(ptsAddedCooModified):
- # vertex = geompy.MakeVertex(*tuple(tup))
- # prj = geompy.MakeProjection(vertex, faces)
- # newCoor = geompy.PointCoordinates( prj )
- # ptsAddedCooModified[i] = newCoor
- ## assign coordinates with projected ones
- #polyh.getCoords()[ptsAdded] = ptsAddedCooModified
-
- print("Writing dual mesh in ", output_file)
+ ## Adding skin + transfering groups on faces from tetras mesh
+ mesh2d = polyh.buildUnstructured().computeSkin()
+ mesh2d.setName(mesh_name)
+
+ polyh_coords = polyh.getCoords()
+
+ treated_edges = []
+
+ mc_groups = []
+ for grp_name in mc_mesh_file.getGroupsOnSpecifiedLev(-1):
+ # This group is created by the export
+ if grp_name == "Group_Of_All_Faces":
+ logger.debug("Skipping group: "+ grp_name)
+ continue
+ logger.debug("Transferring group: "+ grp_name)
+
+ # get the polygons ids on the dual mesh from the triangles group
+ id_grp_poly, nodes_added_on_tri = \
+ __getIdsGrpDualFromOrig(mc_mesh_file, grp_name, mesh2d, -1)
+
+ if id_grp_poly is not None and grp_name[:4] == __prefix and adapt_to_shape:
+ # This group is on a specific geom face
+ face_id = grp_name.split("_")[-1]
+ face_id = int(face_id)
+ face = id2face[face_id]
+
+ # for each face, get the edges bounding it
+ grp_poly = mesh2d[id_grp_poly]
+ mesh1d = grp_poly.computeSkin()
+
+ face_edges_id = id2face_edges_ids[face_id]
+ for edge_id in face_edges_id:
+ grp_seg_name = "%sedge_%i"%(__prefix, edge_id)
+
+ # get the segs on the dual mesh from the segs group
+ id_grp_seg, nodes_added_on_segs = __getIdsGrpDualFromOrig(\
+ mc_mesh_file, grp_seg_name, mesh1d, -2)
+
+ # project new nodes on its geom edge
+ # (if the group exists on this edge and it has not already been
+ # treated)
+ if id_grp_seg is not None:
+ if edge_id not in treated_edges:
+ edge = id2edge[edge_id]
+ __projectNodeOnSubshape(nodes_added_on_segs,
+ edge, polyh_coords)
+ else:
+ treated_edges.append(edge_id)
+
+ # remove these nodes from the nodes to project on face
+ nodes_added_on_tri = \
+ nodes_added_on_tri.buildSubstraction(nodes_added_on_segs)
+
+ # project new nodes on its geom face
+ __projectNodeOnSubshape(nodes_added_on_tri, face, polyh_coords)
+ else:
+ # add the group to write it
+ mc_groups.append(id_grp_poly)
+
+ # Creating output file
+ logger.debug("Creating file with mesh: "+mesh_name)
+ myfile = mc.MEDFileUMesh()
+ myfile.setName(mesh_name)
polyh.setName(mesh_name)
- polyh.write(output_file)
-
-
+ myfile.setMeshAtLevel(0, polyh)
+ myfile.setMeshAtLevel(-1, mesh2d)
+ for group in mc_groups:
+ myfile.addGroup(-1, group)
+ logger.debug("Writing dual mesh in: "+output_file)
+ myfile.write(output_file, 2)
+ if adapt_to_shape:
+ # delete temporary groups
+ for grp in mesh_groups:
+ __deleteObj(grp)
