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Attach region name mapping to plex #111

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Attach region name mapping to plex #111

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3a69de4
Fixes for SplineGeometry and CSG2d
pbrubeck Mar 30, 2026
27ad544
Allow geo to be a Netgen mesh to extract edgenr_mapping
pbrubeck Mar 30, 2026
ea8714c
Allow geo to be a Netgen mesh to extract edgenr_mapping
pbrubeck Mar 30, 2026
110fdc2
add labeled entities for each codim
pbrubeck Mar 31, 2026
2f2e990
Attach region name mapping to plex
pbrubeck Mar 31, 2026
e756968
merge conflict
pbrubeck Apr 9, 2026
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14 changes: 14 additions & 0 deletions ngsPETSc/plex.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@
This module contains all the functions related to wrapping NGSolve meshes to
PETSc DMPlex using the petsc4py interface.
'''
from collections import defaultdict
import warnings
import numpy as np
from petsc4py import PETSc
Expand Down Expand Up @@ -213,4 +214,17 @@ def createPETScDMPlex(ngMesh, comm, name):
V = np.empty((0, gdim), dtype=PETSc.RealType)
plex = PETSc.DMPlex().createFromCellList(tdim, T, V, comm=comm)
plex.setName(name)

codim_entity = {0: "cell", 1: "face", 2: "edge"}
for codim in range(tdim):
label_mapping = defaultdict(list)
if comm.rank == 0:
regions = ngMesh.GetRegionNames(codim=codim)
for label, rname in enumerate(regions, start=1):
label_mapping[rname].append(label)

label_mapping = comm.bcast(dict(label_mapping), root=0)
entity = codim_entity[codim]
plex.setAttr(f"{entity}_region_names", label_mapping)

return plex
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