
Fusion allows resource packs to use additional texture and model types such as connected textures!

Fusion is a library for both Forge and Fabric which adds additional resource pack features such as connected textures and custom entity models to be used in resource packs and other mods!
Integration with Fusion can be done optionally for a soft dependency.
https://github.com/SuperMartijn642/Fusion/wiki#for-resource-packs
https://github.com/SuperMartijn642/Fusion/wiki#for-mod-developers

Here's a list of resource packs available for Fusion.
Official resource packs:
Third-party resource packs:

Connected textures are textures with a special layout which allows them to connect to other blocks when combined with the connecting model type. Fusion offers 7 different connecting texture layouts for different situations.
Here are examples of the full and compact layouts:

Scrolling textures are a type of animated texture which scrolls over an image. The scrolling can occur from any corner to any other corner of the texture, even diagonal!
Here is an example of a conveyor belt:


Continuous textures allow creating textures which span multiple blocks!

Using the features provided by the connecting model and connecting texture type, you can also create block overlays!

Custom entity models and entity model modifiers allow resource packs to change entity models and textures randomly or depending various conditions such altitude, biome, dimension, age, etc.

Yes, you are allowed use Fusion in your modpack
No, Fusion is only required on the client and does nothing when installed on a server
If you are using a version of Sodium older than 0.6, you will also have to install Indium. Sodium replaces the vanilla rendering with their own which ignores the Fabric Rendering API. Indium patches Sodium to support the Fabric Rendering API

For future content, upcoming mods, and discussion, feel free to join the SuperMartijn642 discord server!