Creating block I override methods that take block state as parameter and do something with it(for example onBlockPlacedBy). But I don't know must I call setBlockState from World to update block state?

49 minutes ago, AntonBespoiasov said:

Creating block I override methods that take block state as parameter and do something with it(for example onBlockPlacedBy). But I don't know must I call setBlockState from World to update block state?

Post your code. And explain what you are trying to do.

23 minutes ago, Animefan8888 said:

Post your code. And explain what you are trying to do.

@Override
    public void onBlockPlacedBy(World worldIn, BlockPos pos, IBlockState state, EntityLivingBase placer, ItemStack stack)
    {
        state.withProperty(BlockBed.FACING, placer.getHorizontalFacing());
        calculateBedTileBorders(worldIn, pos, state);
        calculateBedTilePillow(worldIn, pos, state, placer.getHorizontalFacing());
        notifyNeighborsOfBorderRecalculation(worldIn, pos);    
        worldIn.setBlockState(pos, state);
    }

calculateBedTileBorders(...) and calculateBedTilePillows(...) are functions that affect state, they don't set blcok state in world. notifyNeighborsOfBorderRecalculation(...) is a function that tells blocks around that they must call calculateBedTileBorders(...). TillingBed(block where this method is overridden) is a bed with connected textures.

 

What I think happens there? All these methods that are called in onBlockPlacedBy(...) don't copy state but just change("mutate") it and then this block state is set in world in onBlockPlacedBy(...). Why methods that are called in onBlockPlacedBy(...) just change it and don't copy? Each of these methods has its own parameter state in it that refer to single instance of block state due to IBlockState is mutable.

5 minutes ago, AntonBespoiasov said:

Each of these methods has its own parameter state in it that refer to single instance of block state due to IBlockState is mutable.

They might exist because there are two BlockStates for a bed. The pillow part of the bed and foot part of the bed. However, I don't know because you are looking at rather old code.