Although I am happy to see finally we can use navmesh for AI path finding in UT, there are a few things about the system really bug me.
1) The first one is, turn off the automatic update of navmesh doesn't actually work, when I rebuild the geometry, it always triggers the navmesh building.
Two workarounds for this one, you can resize the navmesh bounds volume to much smaller so it takes almost no time to update the navmesh, or you can click on a blocking volume in geometry editing mode when the geometry rebuilding is done.
2) "Build All" doesn't build navmesh nodes and links at all, if the automatic update is disabled.
You'll suppose a Build-All means build all, as the hint suggests, the lightings, the visibility, the navigation network, the brushes, ALL!
You just have to manually rebuild navigation after a Build-All.
3) The generated path nodes and links are fragile.
When open a map and save it, they are broken (They are there but the bots no more recognize them).
When modify a blocking volume, or move an inventory item, they are ALL gone. Man, I miss the old days when we could rebuild the changed pathnodes. Or at least moving one node didn't get rid of the whole node network.
4) Lack of ways to control the precision of navmesh generation. Yes we can tune the cell size and the max simplification error value to gain some control but basically what these parameter do, is something global. What I've found could be useful, is the ability to control the generation locally for tricky geometry like a narrow curvy catwalk, but for now there is no such tool AFAIK. It could be a specific volume or something.
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