问生成中空立方体矩阵

EN

public class World : MonoBehaviour
{
    public GameObject cube;
    public int volume;

    private void Awake()
    {
        for (int i = 0, x = 0; x < volume; x++)
        {
            for (int y = 0; y < volume; y++)
            {
                for (int z = 0; z < volume; z++)
                {
                    i++;
                    var go = Instantiate(cube);
                    go.name = "Cube " + i;
                    go.transform.position = new Vector3
                    {
                        x = x,
                        y = y,
                        z = z
                    };
                }
            }
        }
    }
}