Sometimes you want your world to be very, very big. Here's a library I've been working on to make that easy, by streaming in cells at different levels of detail.
Cells can be loaded however you like: hand-crafted or procgen. As a demo project, I've used it with my old SDF library to generate infinite editable terrain.
It's a work in progress, but you can play around with it here: ziks.sdfworld