[RequireComponent(typeof(MeshFilter))]
    [RequireComponent(typeof(MeshRenderer))]
    public class MeshGenerator : MonoBehaviour {
        Mesh _mesh;
        MeshFilter _meshFilter;

        public void Initialize() {
            _meshFilter = GetComponent<MeshFilter>();
        }

        public void CreateMesh(List<Tile> tiles) {
            _mesh = new Mesh();
            Debug.Log(_mesh);
            MeshFilter[] meshFilters = null;
            for (int x = 0; x < tiles.Count; x++) {
                Tile tile = tiles[x];
                meshFilters[x] = tile.GetComponentInChildren<MeshFilter>();
                Debug.Log(tile.name + " is added.");
            }
            CombineInstance[] combines = new CombineInstance[meshFilters.Length];
            Debug.Log(combines.Length);
            int i = 0;
            while (i < meshFilters.Length) {
                combines[i].mesh = meshFilters[i].sharedMesh;
                combines[i].transform = meshFilters[i].transform.localToWorldMatrix;
                i++;
            }
            _mesh.CombineMeshes(combines);
            _meshFilter.mesh = _mesh;
        }
    }