Pseudo code of a simple RenderableProvider

GameBoard.java

public class GameBoard implements RenderableProvider {
	public static class BoardPiece extends Renderable {
		public Matrix4 localTransform = new Matrix4();
	}

	public Array<BoardPiece> pieces = new Array<BoardPiece>();
	public Matrix4 transform = new Matrix4();

	@Override
	public void getRenderables (Array<Renderable> renderables, Pool<Renderable> pool) {
		for (BoardPiece piece : pieces) {
			piece.worldTransform.set(transform).mul(piece.localTransform);
			renderables.add(piece);
		}
	}
}