Ok, this task, which should be quiet easy, has been giving quite a bit of trouble. For the past 2 Days I was trying to place a block using code and tried using

worldIn.mayPlace();

and

worldIn.setBlockState();

but I don't seem to get them to work, which one is the right method, or is there another one? I don't get errors or anything and for setBlockState(), the flags don't do anything...

We need to see more code. Namely:

 - Where you are calling this code

 - What parameters you are passing

Ok, currently I'm trying to use setBlockState(), I'm calling it from an onItemUse method and here is the code:

	@Override
    public ActionResult<ItemStack> onItemRightClick(World world, EntityPlayer player, EnumHand hand) {
		if (!world.isRemote) {
			try {
				JsonObject tardfile = Tardfile.findparseTardfileByName(player.getName());
			} catch (IOException e) {
				e.printStackTrace();
			}
		
			Vec3d lookingAt = player.getLookVec();
			int x = (int) lookingAt.x;
			int y = (int) lookingAt.y;
			int z = (int) lookingAt.z;
			
			BlockPos pos = new BlockPos(x, y, z);
			pos.up();
			
			world.setBlockState(pos, MachineBlocks.machine_tardis.getDefaultState(), 3);
			System.out.println("Test");
			
			return new ActionResult<>(EnumActionResult.SUCCESS, player.getHeldItem(hand));
			
		}
		return new ActionResult<>(EnumActionResult.PASS, player.getHeldItem(hand));
	}

 

Thanks for your help, it works now!. Regarding the Tardfiles, they hold information about Tardis interior locations, but also are configuration files. But I'm currently planning on moving to a different soloution, since the current one  is a bit, well... shitty