Code shared from the Rust Playground

playground.rs

struct Model {
	pub data: Box<[u8]>
}

struct Entity {
	// ...
	pub model_idx: usize
}

struct World {
	entities: Vec<Entity>,
	models: Vec<Model>
}

fn main() {
    let model = Model { data: vec![1,2,3].into_boxed_slice() };
    let entity = Entity { model_idx: 0 };
    let world = World {
        entities: vec![entity],
        models: vec![model]
    };
    
    println!("{:?}", world.models[world.entities[0].model_idx].data)
}