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Of course the process may take some time, but the results can be worthwhile.
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you can not add detail on a road in a selected area only: when you add points to the profile of the road, all the road long you will have that number of points in the profile. These are the most important problems, I think, but man can find more e.g. You can not control the UV mapping on the terrain.
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There is a lighting mismatch in the zones where track and terrain join, and at the boundaries between terrain zones (this is caused by a bad programming when computing the vertex normal at the boundaries: they are calculated ignoring the adjacent elements).Road crossings/detours are a nightmare.From my point of view BTB has a few drawbacks when creating tracks for RBR.