public class RockBlock extends Block {
    private static final VoxelShape[] SHAPES = new VoxelShape[]{
            Block.makeCuboidShape(3.0D, 0.0D, 3.0D, 13.0D, 1.0D, 13.0D)};

    public RockBlock() {
        super(AbstractBlock.Properties.create(Material.PLANTS).doesNotBlockMovement().hardnessAndResistance(0.0f));
    }

    @Override
    public VoxelShape getShape(BlockState state, IBlockReader worldIn, BlockPos pos, ISelectionContext context) {
        return SHAPES[0];
    }
}