Sry =)
i think it is unnecessary to render the block surface you can not see.
So it would still save power if it would change?
you are right kumasasa but what if it even with normal texturepacks
not really Anon Ymus, i mean the block texture under a step ore a stairs must not be generated pointless if you can not see it, right?
damn, I'm not looking for stairs before i post it