public void writeToNBT(NBTTagCompound tagCompound) {
    tagCompound.setString("name", getName());
    Coordinate spawnPoint = getSpawnPoint();
    if (spawnPoint != null) {
      Coordinate.writeToNBT(tagCompound, "spawnPoint", spawnPoint);
    }
    tagCompound.setInteger("probeCounter", getProbeCounter());
    tagCompound.setInteger(
        "version",
        1); // Version number so that we can detect incompatible changes in persisted dimension
    // information objects.

    tagCompound.setInteger(
        "terrain",
        terrainType == null ? TerrainType.TERRAIN_VOID.ordinal() : terrainType.ordinal());
    tagCompound.setIntArray("features", toIntArray(featureTypes));
    tagCompound.setIntArray("structures", toIntArray(structureTypes));
    tagCompound.setIntArray("effects", toIntArray(effectTypes));

    List<Integer> c = new ArrayList<Integer>(biomes.size());
    for (BiomeGenBase t : biomes) {
      if (t != null) {
        c.add(t.biomeID);
      } else {
        c.add(BiomeGenBase.plains.biomeID);
      }
    }
    tagCompound.setIntArray("biomes", ArrayUtils.toPrimitive(c.toArray(new Integer[c.size()])));
    tagCompound.setInteger(
        "controller",
        controllerType == null
            ? ControllerType.CONTROLLER_DEFAULT.ordinal()
            : controllerType.ordinal());
    tagCompound.setString("digits", digitString);

    tagCompound.setLong("forcedSeed", forcedDimensionSeed);
    tagCompound.setLong("baseSeed", baseSeed);
    tagCompound.setInteger("worldVersion", worldVersion);

    setBlockMeta(tagCompound, baseBlockForTerrain, "baseBlock");
    setBlockMeta(tagCompound, tendrilBlock, "tendrilBlock");

    writeBlocksToNBT(tagCompound, pyramidBlocks, "pyramidBlocks");

    writeBlocksToNBT(tagCompound, sphereBlocks, "sphereBlocks");
    if (sphereBlocks.length > 0) {
      // Write out a single sphere block for compatibility with older RFTools.
      setBlockMeta(tagCompound, sphereBlocks[0], "sphereBlock");
    }

    writeBlocksToNBT(tagCompound, hugeSphereBlocks, "hugeSphereBlocks");
    writeBlocksToNBT(tagCompound, hugeLiquidSphereBlocks, "hugeLiquidSphereBlocks");
    writeFluidsToNBT(tagCompound, hugeLiquidSphereFluids, "hugeLiquidSphereFluids");

    writeBlocksToNBT(tagCompound, liquidSphereBlocks, "liquidSphereBlocks");
    if (liquidSphereBlocks.length > 0) {
      // Write out a single sphere block for compatibility with older RFTools.
      setBlockMeta(tagCompound, liquidSphereBlocks[0], "liquidSphereBlock");
    }

    writeFluidsToNBT(tagCompound, liquidSphereFluids, "liquidSphereFluids");
    if (liquidSphereFluids.length > 0) {
      tagCompound.setInteger(
          "liquidSphereFluid", Block.blockRegistry.getIDForObject(liquidSphereFluids[0]));
    }

    setBlockMeta(tagCompound, canyonBlock, "canyonBlock");
    tagCompound.setInteger("fluidBlock", Block.blockRegistry.getIDForObject(fluidForTerrain));

    writeBlocksToNBT(tagCompound, extraOregen, "extraOregen");
    writeFluidsToNBT(tagCompound, fluidsForLakes, "lakeFluids");

    tagCompound.setBoolean("peaceful", peaceful);
    tagCompound.setBoolean("noanimals", noanimals);
    tagCompound.setBoolean("shelter", shelter);
    tagCompound.setBoolean("respawnHere", respawnHere);
    if (celestialAngle != null) {
      tagCompound.setFloat("celestialAngle", celestialAngle);
    }
    if (timeSpeed != null) {
      tagCompound.setFloat("timeSpeed", timeSpeed);
    }
    tagCompound.setInteger("probes", probeCounter);
    tagCompound.setInteger("actualCost", actualRfCost);

    skyDescriptor.writeToNBT(tagCompound);
    weatherDescriptor.writeToNBT(tagCompound);

    tagCompound.setLong("patreon1", patreon1);

    NBTTagList list = new NBTTagList();
    for (MobDescriptor mob : extraMobs) {
      NBTTagCompound tc = new NBTTagCompound();

      if (mob != null) {
        if (mob.getEntityClass() != null) {
          tc.setString("class", mob.getEntityClass().getName());
          tc.setInteger("chance", mob.getSpawnChance());
          tc.setInteger("minGroup", mob.getMinGroup());
          tc.setInteger("maxGroup", mob.getMaxGroup());
          tc.setInteger("maxLoaded", mob.getMaxLoaded());
          list.appendTag(tc);
        }
      }
    }

    tagCompound.setTag("mobs", list);
    tagCompound.setString("dimensionTypes", StringUtils.join(dimensionTypes, ","));
  }
  private void setupFromNBT(NBTTagCompound tagCompound) {
    terrainType = TerrainType.values()[tagCompound.getInteger("terrain")];
    featureTypes = toEnumSet(getIntArraySafe(tagCompound, "features"), FeatureType.values());
    structureTypes = toEnumSet(getIntArraySafe(tagCompound, "structures"), StructureType.values());
    effectTypes = toEnumSet(getIntArraySafe(tagCompound, "effects"), EffectType.values());

    biomes.clear();
    for (int a : getIntArraySafe(tagCompound, "biomes")) {
      BiomeGenBase biome = BiomeGenBase.getBiome(a);
      if (biome != null) {
        biomes.add(biome);
      } else {
        // Protect against deleted biomes (i.e. a mod with biomes gets removed and this dimension
        // still uses it).
        // We will pick a replacement biome here.
        biomes.add(BiomeGenBase.plains);
      }
    }
    if (tagCompound.hasKey("controller")) {
      controllerType = ControllerType.values()[tagCompound.getInteger("controller")];
    } else {
      // Support for old type.
      if (biomes.isEmpty()) {
        controllerType = ControllerType.CONTROLLER_DEFAULT;
      } else {
        controllerType = ControllerType.CONTROLLER_SINGLE;
      }
    }

    digitString = tagCompound.getString("digits");

    forcedDimensionSeed = tagCompound.getLong("forcedSeed");
    baseSeed = tagCompound.getLong("baseSeed");
    worldVersion = tagCompound.getInteger("worldVersion");

    baseBlockForTerrain = getBlockMeta(tagCompound, "baseBlock");
    tendrilBlock = getBlockMeta(tagCompound, "tendrilBlock");
    canyonBlock = getBlockMeta(tagCompound, "canyonBlock");
    fluidForTerrain =
        (Block) Block.blockRegistry.getObjectById(tagCompound.getInteger("fluidBlock"));

    hugeLiquidSphereFluids = readFluidsFromNBT(tagCompound, "hugeLiquidSphereFluids");
    hugeLiquidSphereBlocks = readBlockArrayFromNBT(tagCompound, "hugeLiquidSphereBlocks");

    // Support for the old format with only one liquid block.
    Block oldLiquidSphereFluid =
        (Block) Block.blockRegistry.getObjectById(tagCompound.getInteger("liquidSphereFluid"));
    liquidSphereFluids = readFluidsFromNBT(tagCompound, "liquidSphereFluids");
    if (liquidSphereFluids.length == 0) {
      liquidSphereFluids = new Block[] {oldLiquidSphereFluid};
    }

    // Support for the old format with only one sphere block.
    BlockMeta oldLiquidSphereBlock = getBlockMeta(tagCompound, "liquidSphereBlock");
    liquidSphereBlocks = readBlockArrayFromNBT(tagCompound, "liquidSphereBlocks");
    if (liquidSphereBlocks.length == 0) {
      liquidSphereBlocks = new BlockMeta[] {oldLiquidSphereBlock};
    }

    pyramidBlocks = readBlockArrayFromNBT(tagCompound, "pyramidBlocks");
    if (pyramidBlocks.length == 0) {
      pyramidBlocks = new BlockMeta[] {BlockMeta.STONE};
    }

    // Support for the old format with only one sphere block.
    BlockMeta oldSphereBlock = getBlockMeta(tagCompound, "sphereBlock");
    sphereBlocks = readBlockArrayFromNBT(tagCompound, "sphereBlocks");
    if (sphereBlocks.length == 0) {
      sphereBlocks = new BlockMeta[] {oldSphereBlock};
    }

    hugeSphereBlocks = readBlockArrayFromNBT(tagCompound, "hugeSphereBlocks");

    extraOregen = readBlockArrayFromNBT(tagCompound, "extraOregen");
    fluidsForLakes = readFluidsFromNBT(tagCompound, "lakeFluids");

    peaceful = tagCompound.getBoolean("peaceful");
    noanimals = tagCompound.getBoolean("noanimals");
    shelter = tagCompound.getBoolean("shelter");
    respawnHere = tagCompound.getBoolean("respawnHere");
    if (tagCompound.hasKey("celestialAngle")) {
      celestialAngle = tagCompound.getFloat("celestialAngle");
    } else {
      celestialAngle = null;
    }
    if (tagCompound.hasKey("timeSpeed")) {
      timeSpeed = tagCompound.getFloat("timeSpeed");
    } else {
      timeSpeed = null;
    }
    probeCounter = tagCompound.getInteger("probes");
    actualRfCost = tagCompound.getInteger("actualCost");

    skyDescriptor = new SkyDescriptor.Builder().fromNBT(tagCompound).build();
    calculateCelestialBodyDescriptors();

    patreon1 = tagCompound.getLong("patreon1");

    weatherDescriptor = new WeatherDescriptor.Builder().fromNBT(tagCompound).build();

    extraMobs.clear();
    NBTTagList list = tagCompound.getTagList("mobs", Constants.NBT.TAG_COMPOUND);
    for (int i = 0; i < list.tagCount(); i++) {
      NBTTagCompound tc = list.getCompoundTagAt(i);
      String className = tc.getString("class");
      int chance = tc.getInteger("chance");
      int minGroup = tc.getInteger("minGroup");
      int maxGroup = tc.getInteger("maxGroup");
      int maxLoaded = tc.getInteger("maxLoaded");
      Class<? extends EntityLiving> c = null;
      try {
        c = (Class<? extends EntityLiving>) Class.forName(className);
      } catch (ClassNotFoundException e) {
        throw new RuntimeException(e);
      }
      MobDescriptor mob = new MobDescriptor(null, c, chance, minGroup, maxGroup, maxLoaded);
      extraMobs.add(mob);
    }

    String ds = tagCompound.getString("dimensionTypes");
    dimensionTypes = StringUtils.split(ds, ",");
    if (dimensionTypes == null) {
      dimensionTypes = new String[0];
    }
  }