8 earlier thoughts
To find the sub-hex (i.e. the hex one level finer) in any direction is trivial. The sub-hex in the 3 direction from [4, 2] is [4, 2, 3].
3
[4, 2]
[4, 2, 3]
A more involved question is what's the same-level hex's address in a given direction?
23 later thoughts
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