Comment (by Erik Schnetter):

The proper way to handle this is to inquire with thorn CoordBase how many boundary points there are via its aliased functions. There is e.g. “GetBoundarySizesAndTypes”, or (for multi-block simulations) “MultiPatch_GetBoundarySpecification”.

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-erik

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2288/leans-boundary-condition-setting-for-bssn