ChunkAPI

A multipurpose chunk hooking library that makes adding arbitrary extra data to chunks much easier.

How

Read the code. TL;DR: Replacing the vanilla chunk netcode and save logic with a modular system, and reimplementing the stock vanilla logic on top of this. You can then add your own stuff.

Compatibility

This will definitely break things, but the mods that were developed on top of this would've broken stuff anyways, and having the most breaking changes centralized in a single hook mod makes writing compat much simpler.

API

You can use the api of this mod to add your own chunk data. Minimum requirements you need:

1. A unique ID string for your data (collision avoidance)
2. An object that can be stored in a Map<String, Object> inside each chunk (note: the vanilla replacements bypass this!)
3. Packet data size/serialization/deserialization (for client/server communication)
4. NBT serialization/serialization (for savegames)