Method isOpaqueCube

src/main/java/net/minecraft/block/Block.java:519–522

Used to determine ambient occlusion and culling when rebuilding chunks for render

()

     * Used to determine ambient occlusion and culling when rebuilding chunks for render
     */
    public boolean isOpaqueCube()
    {
        return true;
    }

    public boolean canCollideCheck(IBlockState state, boolean hitIfLiquid)
    {