Hi @louis-e , just noticed a few mistakes you made in your last PR, for example you forgot to put - in the lines that generate custom underground layers, which caused them to generate over ground level, and I decided to remove a function for getting absolute y that simply calls another function, so it's basically useless. Also the program started crashing when I tried to generate my hometown, because its name contains the ї symbol, which is a part of the Unicode, but now it's fixed

Btw, remember this performance test? It now takes only 18 seconds to generate this bbox with terrain enabled, which is over 4 times faster! You really improved the speed of ground generation amazingly

Thanks for the extensive testing, I'm glad you caught some mistakes - let me know if you notice more! :)

Btw, remember this #421 (comment)? It now takes only 18 seconds to generate this bbox with terrain enabled, which is over 4 times faster! You really improved the speed of ground generation amazingly

Woah nice, I didn't expect it to make such a big difference!