//find a singular zone; subfunction of zone
void find_zone(int y, int x, Zone z)
{
tile t = maze [y, x];
if (!t.get_touch())
{
t.set_zone(z);
Debug.Log(t.get_zone().get_id());
t.touch(true);
z.add_tile(t);
if (t.get_northwall() == tile.Wall.none)
{
find_zone(y - 1, x, z);
}
if (t.get_westwall() == tile.Wall.none)
{
find_zone(y, x - 1, z);
}
if (t.get_eastwall() == tile.Wall.none)
{
find_zone(y, x + 1, z);
}
if (t.get_southwall() == tile.Wall.none)
{
find_zone(y + 1, x, z);
}
}
}