I just checked in code for GridService that checks for variable sized region (varregion) overlap when regions are registered. This checks if an existing varregion overlaps a region being registered and if the region being registered overlaps any existing regions.
One problem (besides possible bugs) is that, since OpenSim doesn't de-register regions, it is possible that there are old region entries that overlap. In this case, the simulator will not start up because the initial region setup/registration fails. For this case, while one goes back and cleans up the region database, the parameter: [GridService] SuppressVarregionOverlapCheckOnRegistration=true can be set. There will still be warnings output in the simulator log file (OpenSim.log) that you can use to find the offending region entries, but the simulator will boot up as before. If you find problems with this code, report it on http://opensimulator.org/mantis/view.php?id=7273 . -- mb
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