[Question] Block Entity Models (CEM)

[ClassyCustom]

Relevant Minecraft versions and other mods/projects

N/A

Question

I've been reading the docs and testing things in a resource pack.

I was wondering if it is possible to create custom models for entities of blocks basically (CEM) such as signs (particularly hanging signs), chests, beds, banners, etc. As they use block entities not normal block models, I not fully understanding if they fall into the category of entity models in Fusion.

If this is not currently possible, is it something you are planning to support in the future?

Additional context

No response

[ClassyCustom]

I've also noticed the resource pack Fusion 3D Items, (https://modrinth.com/resourcepack/fusion-3d-items). From what I can see, it only effects on held item display and not on actual block models or block entities when placed in-game.

[SuperMartijn642]

For most blocks that Minecraft renders through block entities, they use the same model system as for entities. This means you can overwrite the models by placing a model in Fusion's entity models folder to overwrite the models. You cannot target them with an entity model modifier though as the entity model modifiers specifically look for an entity type.

There is sadly not really a good way to get the identifiers of Minecraft's entity models besides looking at the code. (As there are more than 300 vanilla entity models and they change with different Minecraft versions, it is also somewhat difficult to list them somewhere).
The sign related models are on Minecraft 1.21.11 are:

• sign/standing/<x>:main
• sign/wall/<x>:main
• sign/hanging/<x>/wall:main
• sign/hanging/<x>/ceiling:main
• sign/hanging/<x>/ceiling_middle:main

Where <x> is any of the wood types, so for example for oak sign/standing/<x>:main it would be sign/standing/oak:main.

You can change these models by placing a model file at the appropriate location in assets/<namespace>/fusion/entity_models/. For example, for sign/standing/oak:main, you would place a model at assets/<namespace>/fusion/entity_models/sign/standing/oak/main.geo.json.
https://github.com/SuperMartijn642/Fusion/wiki/Entity-Models#overwriting-existing-models

I should warn you that there will almost definitely be bugs in Fusion related to entity models as there haven't been many people who have used the entity model features in Fusion.
Most of the other features in Fusion I use myself in other mods and resource packs, hence I can usually test that everything mostly work. As I don't have any use case for the entity model features myself, it is somewhat difficult to test when updating between Minecraft versions. I do have a couple test cases in the form of some minimal resource packs, but these are rather limited and do not involve changing the model for a block entity.
If you do want to give it a try, feel free to report any issues you encounter here on the GitHub repository or to ask me about them on my Discord server and I will do my best to fix them.

I've also noticed the resource pack Fusion 3D Items, (https://modrinth.com/resourcepack/fusion-3d-items). From what I can see, it only effects on held item display and not on actual block models or block entities when placed in-game.

The Fusion 3D Items resource pack indeed only changes item models and does not interact with entity models.

[ClassyCustom]

Just to make sure I’m understanding this right — the folder structure has to exactly match the below, and Fusion won’t pick things up if they’re just placed in a more general folder.

So for something like an oak hanging sign, I’d need to follow the full path, for example:
assets//fusion/entity_models/sign/hanging/oak/ceiling/main.geo.json
assets//fusion/entity_models/sign/hanging/oak/wall/main.geo.json
assets//fusion/entity_models/sign/hanging/oak/ceiling_middle/main.geo.json

And I can’t just do something simpler like:
assets//fusion/entity_models/oak_wall_hanging_sign.geo.json
assets//fusion/entity_models/oak_ceiling_hanging_sign.geo.json
assets//fusion/entity_models/oak_middle_hanging_sign.geo.json

Is that correct?
Just want to be sure I’m going in the right direction before I spend too much time on this.

[SuperMartijn642]

Just to make sure I’m understanding this right — the folder structure has to exactly match the below, and Fusion won’t pick things up if they’re just placed in a more general folder.

Yes. You can compare it to blockstate files for blocks.
The cobblestone blockstate file specifies to use model block/cobblestone. You are essentially overwriting the block/cobblestone model, hence it needs to be in the same position.
The blockstate file would here be an entity model modifier. You can normally use the entity model modifier file to point to whatever entity model. Because entity model modifiers don't work for block entities, your only option is to just overwrite the original model location.