Another interesting reading about derivative maps:
http://www.rorydriscoll.com/2012/01/11/derivative-maps/
Author solved the original problem with closeups by doubling bump map storage requirements. Looks pretty cool to me.
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Yep, and "doubling the bump map storage requirements" is still better than the 3 channels of an object-space normal map and equal than a 2-channel compressed TS normal map, so they're good!
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