[Dune] Spherical Coordinates

[S. Swayamjyoti]

Hello Dune,

In my Finite Element Mesh, I needed the information on position coordinates
of the vertices of each element. I can obtain them by
*it->geometry().corner(i)[0]
*where *it is the reference to the element. But, now I need information on
the position coordinates in spherical coordinates. For example, I have
finite element meshing done inside a sphere. I need coordinates of the nodes
which are on the boundary of the sphere. How can I obtain them in DUNE?

Regards,
Swayam
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