No longer maintained. You can use MCASelector, which gives you a nice overview of the world. It has a command-line tool built-in for mass processing of your world.
This program was created originally to change the biome ids of your map. Since then, it has been expanded to make it a more general batch-editor for chunks. Only one chunk is loaded at a time, so the program has a small memory footprint.
Current features include:
- Change biome ids.
- Change block ids. Not only blocks placed in the world are replaced, but also blocks in chests, inventories and many other places. See the section below.
- Remove chunks that have been loaded for less than X minutes.
- Spawn ores in existing chunks.
Make sure you have installed Maven.
First, compile Hammer. This library is required
for ClimateChanger to compile.
Then, download the source code of ClimateChanger (see the sidebar) and run the command
mvn install in the directory you have just downloaded ClimateChanger to. You should
end up with a runnable JAR file in the newly created target directory.
Before you use any of the features, please read the notes about the feature below.
Execute the command java -jar ClimateChanger.jar. A window should pop up.
Instead of typing the command, on most operating systems you can also right click the jar and select Open with -> Java.
Click the Browse... button to select the level.dat of a world. Add one
or more actions and click Execute tasks. The actions will be executed on
all dimensions of the world.
On a headless server, or just prefer to type commands? Start the program like this:
jar -jar ClimateChanger.jar <path/to/level.dat> <action> [and <action> [and ...]]
<path/to/level.dat> is the relative or absolute path to the level.dat of
the world.
<action> is the actions to execute. It can be one of the following:
changeBiome <fromId> <toId>changes all biomes with the<fromId>to the<toId>. If you use-1as the<fromId>all biomes will be changed to the given<toId>, so that you end up with a one-biome world.changeBlock <fromNamespacedId> <toNamespacedId>changes all blocks with the first id to the second.spawnOre <namespacedId> <maxRadius> <attemptsPerChunk> <chancePerAttempt> <minAltitude> <maxAltitude> <uniform/triangle> <spawnInBlock;anotherBlock,...>spawns ores of the given type in each chunk.deleteoldchunks <minutesPlayed>will delete all chunks that have been loaded for less than<minutesPlayed>.
You can combine multiple actions with the syntax
<action> and <action> and <action>.
This is the original feature of the program. It simply replaces the biome in the world. This is useful if you want to change the climate of a region: grass color, mobs spawning and weather will change. Actual blocks won't be changed.
The program allows you to use both block ids and names. Modded block names are
supported; the level.dat file is read for name<->id mappings created by
Forge Mod Loader.
Block ids and data are replaced in:
- Blocks placed in the world.
- Blocks placed in player inventories.
- Blocks placed in Ender Chests.
- Blocks placed in tile entities that use the
Itemstag (in vanilla: chests, dispensers, droppers, hoppers, furnaces, brewing stands) - Blocks placed in entities that use the
Itemstag (in vanilla: horses, minecarts with chest) - Blocks placed in entities that use the
Itemtag (in vanilla: items on the ground, item frames) - Blocks being pushed by pistons.
Ores always spawn in stone. Chance per attempt is always 100. Please note that in vanilla emeralds only spawn in the Extreme Hills biome.
In vanilla Minecraft attempts per chunk is called spawn tries. In the mod Terrain Control attempts per chunk is called frequency and chance per attempt is called rarity.
The ore spawning automatically changes ores such as minecraft:diamond into minecraft:deepslate_diamond when you
allow them to spawn in deepslate. When you spawn deepslate as an ore in minecraft:stone, it will automatically change stone ores into deepslate ores.
| Ore | Max radius | Attempts per chunk | Altitude | Distribution |
|---|---|---|---|---|
| Deepslate | 64 | 2 | 0 - 16 | Uniform |
| Dirt | 33 | 10 | 0 - 256 | Uniform |
| Gravel | 33 | 8 | 0 - 256 | Uniform |
| Granite | 33 | 10 | 0 - 79 | Uniform |
| Diorite | 33 | 10 | 0 - 79 | Uniform |
| Andesite | 33 | 10 | 0 - 79 | Uniform |
| Tuff | 33 | 1 | 0 - 16 | Uniform |
| Coal | 17 | 20 | 0 - 127 | Uniform |
| Copper | 10 | 6 | 0 - 96 | Triangle |
| Iron | 9 | 20 | 0 - 63 | Uniform |
| Gold | 9 | 2 | 0 - 31 | Uniform |
| Redstone | 8 | 8 | 0 - 15 | Uniform |
| Diamond | 8 | 1 | 0 - 15 | Uniform |
| Lapis | 8 | 1 | 0 - 30 | Triangle |
| Emerald | 6 | 1 | 4 - 31 | Uniform |
An uniform distribution is simply randomNumberInclusiveBetween(min, max), while the triangle distribution
is min + randomNumberInclusiveBetween(0, (max - min) / 2) + randomNumberInclusiveBetween(0, (max - min) / 2).
The NBT files and the RegionFile.java were open sourced by Mojang in 2011
and 2012. The have a don't do evil license. The files have been modified
for ClimateChanger.
All other files are public domain. Do whatever you want with it.