Heh, I forgot who was talking about it, but the topic was displaying hex grids in HTML (and via a table, I think.) Anyway, that problem solving bug in my brain would not let it go. So, if that was you or you're just curious about such things, here are some samples of ways to do vertical hex grids. The first one isn't very pretty, but playing with the numbers and ratios will make it look better if need be.http://www.tangent-zero.com/hex_test/hex_test.htm
I must not have had a stack overflow account at the time, or I probably would have asked it there. If anyone knows this or wants to take a crack at it, I'd still be curious of the answer. (It must be a solved problem, because hundreds of games have hex grids that you can interact with.) I only needed it solved for the top layer, because calculating for any further layers is easy (just add offsets like the renderer does).
01/06/14: A dwarven dragon-scale shield that was secreted away by a strange messenger long ago. It is the only thing feared by the Fell Dragon of Bloody Death.