Method canPlaceBlockAt

src/main/java/net/minecraft/block/Block.java:870–873

(World worldIn, BlockPos pos)

    }

    public boolean canPlaceBlockAt(World worldIn, BlockPos pos)
    {
        return worldIn.getBlockState(pos).getBlock().blockMaterial.isReplaceable();
    }

    public boolean onBlockActivated(World worldIn, BlockPos pos, IBlockState state, EntityPlayer playerIn, EnumFacing side, float hitX, float hitY, float hitZ)
    {