I'm making a Minecraft Fabric mod (1.21.11) with a cannon block.

The cannon uses a custom GeckoLib model (BlockEntity) and a separate

invisible "seat" entity (CannonSeatEntity extends Entity) that spawns

when a player clicks the cannon block to allow riding it.

Current state:

- The white outline is already removed via a mixin

- However, the entity still has a 1x1x1 invisible hitbox

- This hitbox behaves like a full cube: you cannot walk through it

The problem:

Even though the outline is gone, the CannonSeatEntity still blocks movement

as a full cube, which is not desired.

What I tried:

- getVisualShape() returning Shapes.empty()

- getDimensions() override (getBoundingBox() is final)

- Mixins to LevelRenderer (outline rendering)

- setInvisible(true)

- noPhysics = true

- isPickable() returns false

- very small dimensions in EntityType.Builder

What I want to achieve:

- Remove the physical collision of the entity completely (no blocking hitbox)

- Keep the entity usable for riding

- Create a VoxelShape that matches the full custom 3D GeckoLib model (not a cube)

- Make the entire model clickable, so no matter where I click on the cannon, I can sit on it

Using: Fabric 1.21.11, GeckoLib 5.4.4, Mojang mappings