static void GetMeshData(MassMeshes target)
    {
        MassMeshData data = null;
        foreach (var d in DataList)
            if (d.id == target.id)
                data = d;

        if (data == null) {
            target.CreateMesh ();
            data = new MassMeshData (target.id, target.mesh, target.numInSingleMesh);
            DataList.Add (data);
        } else {
            target.mesh = data.mesh;
            target.numInSingleMesh = data.numInSingleMesh;
        }
    }
    static void GetMeshData(MassMeshes target)
    {
        MassMeshData data = null;

        foreach (var d in DataList)
        {
            if (d.id == target.id)
            {
                data = d;
            }
        }

        if (data == null)
        {
            target.CreateMesh();
            data = new MassMeshData(target.id, target.mesh, target.numInSingleMesh);
            DataList.Add(data);
        }
        else
        {
            target.mesh            = data.mesh;
            target.numInSingleMesh = data.numInSingleMesh;
        }
    }