A height increase involves, primarily, the addition of a whole bunch of air. In the new ANVIL format (which was implement on the PC in Version 1.2.3 and just implemented in the Xbox edition)... air = nothing. Conversely, increasing the lateral size of the map means increasing the layers of stone and ore and trees, etc... things that take up memory and processing power more than air (which again, air = nothing).
In addition, many people would have raged if they didn't include the height increase that was added in the corresponding changelog (1.2.3), because then it wouldn't be exactly like their precious PC version. And it's not like they just increased the height limit on a whim, thus they cannot do the same with the world size.
an air block is no different to any other block, it still has to be rendered into the game, your saying air = nothing, thats not true
Whether or not it is rendered means nothing. It takes no memory to add air. Air is nothing. There is no increased memory usage with the added air above the map now. The only time it would begin using more memory is if you began building in it.
ok, i might be wrong, but also lost, mc is virtual reality, on that i though everything would NEED to be rendered or loaded in some way, else how does it know where to or how to replace air blocks with say cobble it there nothing there ?? how would it know to put a block i exactly the right place or even how it would let light through the air block
also you saying if i loaded a map with just air it would take no memory, that makes no sense as your saying theres nothing to load, so what would it load ??
maybe im looking at the whole thing wrong, perhaps VR is RL now
Well, I don't think you could have a map that was just air since you can't mine away the edge walls underground or the bedrock. It would, therefore, have the outer edge boundary, at minimum, to load. I wish Janx would come on this thread since he did write a pretty good explanation of what he understood the ANVIL format to do differently than McRegion... and as I recall, that did have something to do with how the file better compressed the empty spaces (i.e. air in the map).
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You interpret this then...
Ref: Minecraft Wiki Page on Air: "Air is literally the absence of a block; It represents unoccupied spaces."
Ref: Minecraft Wiki Page on ANVIL File Format: "Empty sections of the world are not loaded into memory or saved to disk."
That's how it worked with McRegion. While air is still technically a block, the new format, Anvil, does not load air into memory.
Well, I don't think you could have a map that was just air since you can't mine away the edge walls underground or the bedrock. It would, therefore, have the outer edge boundary, at minimum, to load. I wish Janx would come on this thread since he did write a pretty good explanation of what he understood the ANVIL format to do differently than McRegion... and as I recall, that did have something to do with how the file better compressed the empty spaces (i.e. air in the map).