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  • That depends on the cost of user-path filtering vs the cost of path finding. Commented Dec 13, 2013 at 16:55
  • There are all sort of constraints defined for the user of the navigation system that should be matched with indoor space constraints, and time of using the system (this is the second choice). The first one is more like a pre-processing sort of path-finding. Commented Dec 13, 2013 at 17:02