Looks very useful. But it's not really procedural world generation, right? I'd call this geographical data visualisation instead. Generation would be creating new worlds with just a seed and an RNG. Was kind of hoping to see that because that was actually an idea I had for my graduation project. I eventually killed that idea because I just couldn't get a good design of how such a library would work (that would be useful in real games). It's a funny coincidence that I also wanted to make the library with a C++ core and a Unity interface.