Locally refining mesh

[cpraveen]

I have seen some mesh refinement example here

https://www.firedrakeproject.org/demos/netgen_mesh.py.html

but I dont see the refine_marked_elements function is available for the mesh object.

Are there any example code to marks elements and so some local refinement.

[cpraveen]

I can generate a mesh

from netgen.geom2d import SplineGeometry
geo = SplineGeometry()
geo.AddRectangle(p1=(-1, -1),
                 p2=(1, 1),
                 bc="rectangle",
                 leftdomain=1,
                 rightdomain=0)
ngmsh = geo.GenerateMesh(maxh=0.1)

but following, which is shown in above webpage does not work

msh = Mesh(ngmsh)

[cpraveen]

I did not have netgen support in firedrake before, now it works.