Structure Portals

Structure Portals stops Nether portals from generating inside the bounding box of a structure chosen in its config. Structures can be listed by ID, and the mod reads those IDs from the list. Vanilla structures are written as plain names, while structures added by other mods need the modid followed by a colon and the structure ID. Players can look up exact IDs with the locate structure command, whose autocomplete list shows them.

Settings live in a file named structureportals-common.toml. Deleting that file makes the game create it again with default values. Configuration changes apply only after the game is restarted. The mod is published for Forge and runs on client and server, so the server and every player need it. Files cover 1.20.1, 1.20.2, 1.20.3, 1.20.4 and 1.20.5, with 1.0.0 for 1.20.5 as the latest file, released under All rights reserved, so the code is not open source.

The return portals that Structure Portals leaves in place still generate everywhere, and once destroyed they cannot be relit. Worlds built on certain other modpack-oriented terrain mods are not supported, because those remove the bounding boxes of structures even with vanilla generation, so the setting has nothing to act on there.