private static void generateRandomTree(World world){
		BlockLog b = null;

		TileMap tm = world.tileMap;

		for(int numTrees = 0; numTrees < 4; numTrees++){

			int x = new Random().nextInt(tm.getXRows());
			int y = new Random().nextInt(tm.getYRows());

			for(int numLogs = 0; numLogs < 3; numLogs++){

				if(y - numLogs > 0)
					if(world.tileMap.isAir(x, (y-numLogs))){
						b = new BlockLog(tm, world);
						b.setPosition(x*32+16, (y-numLogs)*32+16);
						world.listWithMapObjects.add(b);
						System.out.println("added block at " + x + " " + (y-numLogs));
					}
			}
		}
	}