Multiple boundary tags in meshmode export

[wence-]

meshmode/meshmode/interop/firedrake/mesh.py

Lines 802 to 805 in 6b2bd65

	.. warning::
	Currently, no custom boundary tags are exported along with the mesh.
	:mod:`firedrake` seems to only allow one marker on each facet, whereas
	:mod:`meshmode` allows many.

FWIW, since firedrakeproject/firedrake#2007 entities can be marked with multiple tags and it all works. After building the plex, create a "Face Sets" label (or if you don't like that literal, a firedrake.cython.dmcommon.FACE_SETS_LABEL) (or CELL_SETS_LABEL for cells) and mark the points.

[inducer]

cc @benSepanski

@wence- Thanks for the heads-up!

[benSepanski]

The examples in utility meshes seem to only tag each face label with one tag (e.g. plex.setLabelValue(FACE_SETS_LABEL, face_id, label_id)). Are there any examples of tagging with multiple tags?

[wence-]

I don't think so. You can make a gmsh mesh that does multiple tags. Or just copy one of those functions and do multiple marking.