Ok, so I'm wanting to make a terrain generator, for pretty specific uses. On some parts of the map, I want the map to be totally flat (and I can make flat maps.) However on a different part of the map, I want chunks to generate using minecraft's regular terrain generation. How can I do that? tl;dr: (or didn't understand) I want some chunks to generate using my custom terrain generator, and some chunks to generate using Minecraft's terrain generator.