rr_ring.lua

function Ring:disconnect_ring(other_ring)
    local mapEntry= self.other_rings[other_ring]
    local tangent= mapEntry.tangent
    klog.debug("DISCONNECTING %s(%s) -> %s(%s) ", self.id, tostring(self), other_ring.id, tostring(other_ring), tostring(mapEntry.tangent))

    if not mapEntry then
        log.warning("Trying to disconnect %d from %d but no previous connection existed", self.id, other_ring.id)
    end

    self.other_rings[other_ring]= nil         -- other_ring is not mapped anymore
    tangent.other_ring=NULL
--     tangent.next_ring_distance_cw=100000
--     tangent.next_ring_distance_ccw=100000

    -- we need to recalc the tangent distances now that we've
    -- disconnected the ring (some tangents are not there anymore)
    other_ring:calc_tangent_distances()

    -- BBB other info we want to delete?
end