Method canPlaceOn

src/main/java/net/minecraft/block/BlockVine.java:175–178

(Block blockIn)

    }

    private boolean canPlaceOn(Block blockIn)
    {
        return blockIn.isFullCube() && blockIn.blockMaterial.blocksMovement();
    }

    private boolean recheckGrownSides(World worldIn, BlockPos pos, IBlockState state)
    {