for (int x = x1 ; x <= x2; x++)
		{
			for (int y = y1 ; y <= y2; y++)
			{
				for (int z = z1 ; z <= z2; z++)
				{
					if (z != z1 && y != y1 && x != x1)
					{
						// don't spawn
						continue;
					}
					// spawn block here - should fill it up :P
				}
			}
		}