hedwards: Notch (...)s estimation it woud take several petabytes worth of atom to do a relatively modest island.
Fujek: Then again, his calculation is seriously flawed. He assumed a solid block (at maximum resolution), which makes absolutely no sense at all.
If you have no empty space to move in, that'd make for a really fun game to play, wouldn't it? :p
Or, in other words, a very good amount (majority) of game world is usually not 'dense' and thus doesn't have a voxel/atom in this scenario.
Not to mention that you'd usually have objects requiring less than the highest resolution.
There's no problem with that. If you take a look at the assumptions, some of them are over estimating and others are underestimating the amount. What you're neglecting is that just because there's a block there doesn't mean that you can't travel through it. A jungle island would have all sorts of vines in places and probably water.
But, the bigger issue is that even if you do scale back a lot of those areas to be more open, you're still left with the problem that he's using only 1byte per block, and you're going to need a lot more than that to do anything interesting.
Typically the way these Fermi problems go, I'd be surprised if he wasn't within a couple orders of magnitude of the correct number. Which would still place it a hojillion megabytes too large for practical application any time soon.
Yeah, you can probably use quite a few voxels over and over again, but as you do, you lose out on the graphical advantage from using voxels.