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3D Navigation data consistency with a simple infinite ground technique

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The technique for generating infinite ground is simple. I just calculate the view distance from the camera to whatever location it is, then I scale up or down the ground geometry according to that.
Working quite well. But I wonder if I had calculated the navigation data beforehand, will it get affected in anyways? currently I assume there is no problem, because after you calculated the navigation data, it is decoupled from the geometry, when I say put a new "tile" on an area I'm looking towards where there initially was no navigation data when I raise the camera up? because the ground is "scaled" every frame, and probably the navigation mesh sub-system is grabbing the geometry data while you turn your camera again, quite dangerous!!!
secondly, the textures are all screwed up/stretched..
that's the only problems...

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