content: package net.minecraft.block;
  
  import net.minecraft.block.material.MapColor;
  import net.minecraft.block.material.Material;
  import net.minecraft.block.state.IBlockState;
  import net.minecraft.init.Blocks;
  import net.minecraft.util.BlockPos;
  import net.minecraft.util.EnumFacing;
  import net.minecraft.world.IBlockAccess;
  
  public class BlockBreakable extends Block {
      private final boolean ignoreSimilarity;
  
      protected BlockBreakable(Material materialIn, boolean ignoreSimilarityIn) {
          this(materialIn, ignoreSimilarityIn, materialIn.getMaterialMapColor());
      }
  
      protected BlockBreakable(Material p_i46393_1_, boolean p_i46393_2_, MapColor p_i46393_3_) {
          super(p_i46393_1_, p_i46393_3_);
          this.ignoreSimilarity = p_i46393_2_;
      }
  
      public boolean isOpaqueCube() {
          return false;
      }
  
      public boolean shouldSideBeRendered(IBlockAccess worldIn, BlockPos pos, EnumFacing side) {
          IBlockState iblockstate = worldIn.getBlockState(pos);
          Block block = iblockstate.getBlock();
  
          if (this == Blocks.glass || this == Blocks.stained_glass) {
              if (worldIn.getBlockState(pos.offset(side.getOpposite())) != iblockstate) {
                  return true;
              }
  
              if (block == this) {
                  return false;
              }
          }
  
          return (this.ignoreSimilarity || block != this) && super.shouldSideBeRendered(worldIn, pos, side);
      }
  }
  