Suggestion for better meshing

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I was thinking what if bot get stuck and can't get out? Is there a way to temporarily mesh small area around bot like 10x10x10 yards including game objects and all those pesky little annoying stuff that makes your bot cry? Make bot use this mesh and then garbage it until it unstuck procedure won't unstuck him.
Or if meshing cant solve how to get out in 10x10x10 increase it to 20x20x20 yards or so.
I don't know how meshing calculations work or how much processing power they need to create it.