Thread:LOTRMod/@comment-26767096-20170228190157/@comment-25101089-20170304013824

The array we're talking about is just the pixels of map.png converted into biome codes. And yes, it's during game initialisation. The expansion and naturalisation and other effects come later, but they aren't all stored in an array, because 1) it depends on world seed and 2) it would be absolutely enormous and require more RAM than everyone has!